def experiment(state, outdir_base='./'):
rng.seed(1) #seed the numpy random generator
R.seed(1) #seed the other random generator (for reconstruction function indices)
# Initialize output directory and files
data.mkdir_p(outdir_base)
outdir = outdir_base + "/" + state.dataset + "/"
data.mkdir_p(outdir)
logger = Logger(outdir)
logger.log("----------MODEL 2, {0!s}-----------\n".format(state.dataset))
gsn_train_convergence = outdir+"gsn_train_convergence.csv"
gsn_valid_convergence = outdir+"gsn_valid_convergence.csv"
gsn_test_convergence = outdir+"gsn_test_convergence.csv"
train_convergence = outdir+"train_convergence.csv"
valid_convergence = outdir+"valid_convergence.csv"
test_convergence = outdir+"test_convergence.csv"
init_empty_file(gsn_train_convergence)
init_empty_file(gsn_valid_convergence)
init_empty_file(gsn_test_convergence)
init_empty_file(train_convergence)
init_empty_file(valid_convergence)
init_empty_file(test_convergence)
#load parameters from config file if this is a test
config_filename = outdir+'config'
if state.test_model and 'config' in os.listdir(outdir):
config_vals = load_from_config(config_filename)
for CV in config_vals:
logger.log(CV)
if CV.startswith('test'):
logger.log('Do not override testing switch')
continue
try:
exec('state.'+CV) in globals(), locals()
except:
exec('state.'+CV.split('=')[0]+"='"+CV.split('=')[1]+"'") in globals(), locals()
else:
# Save the current configuration
# Useful for logs/experiments
logger.log('Saving config')
with open(config_filename, 'w') as f:
f.write(str(state))
logger.log(state)
####################################################
# Load the data, train = train+valid, and sequence #
####################################################
artificial = False
if state.dataset == 'MNIST_1' or state.dataset == 'MNIST_2' or state.dataset == 'MNIST_3':
(train_X, train_Y), (valid_X, valid_Y), (test_X, test_Y) = data.load_mnist(state.data_path)
train_X = numpy.concatenate((train_X, valid_X))
train_Y = numpy.concatenate((train_Y, valid_Y))
artificial = True
try:
dataset = int(state.dataset.split('_')[1])
except:
logger.log("ERROR: artificial dataset number not recognized. Input was "+str(state.dataset))
raise AssertionError("artificial dataset number not recognized. Input was "+str(state.dataset))
else:
logger.log("ERROR: dataset not recognized.")
raise AssertionError("dataset not recognized.")
train_X = theano.shared(train_X)
train_Y = theano.shared(train_Y)
valid_X = theano.shared(valid_X)
valid_Y = theano.shared(valid_Y)
test_X = theano.shared(test_X)
test_Y = theano.shared(test_Y)
if artificial:
logger.log('Sequencing MNIST data...')
logger.log(['train set size:',len(train_Y.eval())])
logger.log(['train set size:',len(valid_Y.eval())])
logger.log(['train set size:',len(test_Y.eval())])
data.sequence_mnist_data(train_X, train_Y, valid_X, valid_Y, test_X, test_Y, dataset, rng)
logger.log(['train set size:',len(train_Y.eval())])
logger.log(['train set size:',len(valid_Y.eval())])
logger.log(['train set size:',len(test_Y.eval())])
logger.log('Sequencing done.\n')
N_input = train_X.eval().shape[1]
root_N_input = numpy.sqrt(N_input)
# Network and training specifications
layers = state.layers # number hidden layers
walkbacks = state.walkbacks # number of walkbacks
layer_sizes = [N_input] + [state.hidden_size] * layers # layer sizes, from h0 to hK (h0 is the visible layer)
learning_rate = theano.shared(cast32(state.learning_rate)) # learning rate
annealing = cast32(state.annealing) # exponential annealing coefficient
momentum = theano.shared(cast32(state.momentum)) # momentum term
##############
# PARAMETERS #
##############
#gsn
weights_list = [get_shared_weights(layer_sizes[i], layer_sizes[i+1], name="W_{0!s}_{1!s}".format(i,i+1)) for i in range(layers)] # initialize each layer to uniform sample from sqrt(6. / (n_in + n_out))
bias_list = [get_shared_bias(layer_sizes[i], name='b_'+str(i)) for i in range(layers + 1)] # initialize each layer to 0's.
#recurrent
recurrent_to_gsn_weights_list = [get_shared_weights(state.recurrent_hidden_size, layer_sizes[layer], name="W_u_h{0!s}".format(layer)) for layer in range(layers+1) if (layer%2) != 0]
W_u_u = get_shared_weights(state.recurrent_hidden_size, state.recurrent_hidden_size, name="W_u_u")
W_x_u = get_shared_weights(N_input, state.recurrent_hidden_size, name="W_x_u")
recurrent_bias = get_shared_bias(state.recurrent_hidden_size, name='b_u')
#lists for use with gradients
gsn_params = weights_list + bias_list
u_params = [W_u_u, W_x_u, recurrent_bias]
params = gsn_params + recurrent_to_gsn_weights_list + u_params
###########################################################
# load initial parameters of gsn to speed up my debugging #
###########################################################
params_to_load = 'gsn_params.pkl'
initialized_gsn = False
if os.path.isfile(params_to_load):
logger.log("\nLoading existing GSN parameters\n")
loaded_params = cPickle.load(open(params_to_load,'r'))
[p.set_value(lp.get_value(borrow=False)) for lp, p in zip(loaded_params[:len(weights_list)], weights_list)]
[p.set_value(lp.get_value(borrow=False)) for lp, p in zip(loaded_params[len(weights_list):], bias_list)]
initialized_gsn = True
############################
# Theano variables and RNG #
############################
MRG = RNG_MRG.MRG_RandomStreams(1)
X = T.fmatrix('X') #single (batch) for training gsn
Xs = T.fmatrix(name="Xs") #sequence for training rnn-gsn
########################
# ACTIVATION FUNCTIONS #
########################
# hidden activation
if state.hidden_act == 'sigmoid':
logger.log('Using sigmoid activation for hiddens')
hidden_activation = T.nnet.sigmoid
elif state.hidden_act == 'rectifier':
logger.log('Using rectifier activation for hiddens')
hidden_activation = lambda x : T.maximum(cast32(0), x)
elif state.hidden_act == 'tanh':
logger.log('Using hyperbolic tangent activation for hiddens')
hidden_activation = lambda x : T.tanh(x)
else:
logger.log("ERROR: Did not recognize hidden activation {0!s}, please use tanh, rectifier, or sigmoid".format(state.hidden_act))
raise AssertionError("Did not recognize hidden activation {0!s}, please use tanh, rectifier, or sigmoid".format(state.hidden_act))
# visible activation
if state.visible_act == 'sigmoid':
logger.log('Using sigmoid activation for visible layer')
visible_activation = T.nnet.sigmoid
elif state.visible_act == 'softmax':
logger.log('Using softmax activation for visible layer')
visible_activation = T.nnet.softmax
else:
logger.log("ERROR: Did not recognize visible activation {0!s}, please use sigmoid or softmax".format(state.visible_act))
raise AssertionError("Did not recognize visible activation {0!s}, please use sigmoid or softmax".format(state.visible_act))
# recurrent activation
if state.recurrent_hidden_act == 'sigmoid':
logger.log('Using sigmoid activation for recurrent hiddens')
recurrent_hidden_activation = T.nnet.sigmoid
elif state.recurrent_hidden_act == 'rectifier':
logger.log('Using rectifier activation for recurrent hiddens')
recurrent_hidden_activation = lambda x : T.maximum(cast32(0), x)
elif state.recurrent_hidden_act == 'tanh':
logger.log('Using hyperbolic tangent activation for recurrent hiddens')
recurrent_hidden_activation = lambda x : T.tanh(x)
else:
logger.log("ERROR: Did not recognize recurrent hidden activation {0!s}, please use tanh, rectifier, or sigmoid".format(state.recurrent_hidden_act))
raise AssertionError("Did not recognize recurrent hidden activation {0!s}, please use tanh, rectifier, or sigmoid".format(state.recurrent_hidden_act))
logger.log("\n")
####################
# COST FUNCTIONS #
####################
if state.cost_funct == 'binary_crossentropy':
logger.log('Using binary cross-entropy cost!')
cost_function = lambda x,y: T.mean(T.nnet.binary_crossentropy(x,y))
elif state.cost_funct == 'square':
logger.log("Using square error cost!")
#cost_function = lambda x,y: T.log(T.mean(T.sqr(x-y)))
cost_function = lambda x,y: T.log(T.sum(T.pow((x-y),2)))
else:
logger.log("ERROR: Did not recognize cost function {0!s}, please use binary_crossentropy or square".format(state.cost_funct))
raise AssertionError("Did not recognize cost function {0!s}, please use binary_crossentropy or square".format(state.cost_funct))
logger.log("\n")
################################################
# COMPUTATIONAL GRAPH HELPER METHODS FOR GSN #
################################################
def update_layers(hiddens, p_X_chain, noisy = True):
logger.log('odd layer updates')
update_odd_layers(hiddens, noisy)
logger.log('even layer updates')
update_even_layers(hiddens, p_X_chain, noisy)
logger.log('done full update.\n')
def update_layers_reverse(hiddens, p_X_chain, noisy = True):
logger.log('even layer updates')
update_even_layers(hiddens, p_X_chain, noisy)
logger.log('odd layer updates')
update_odd_layers(hiddens, noisy)
logger.log('done full update.\n')
# Odd layer update function
# just a loop over the odd layers
def update_odd_layers(hiddens, noisy):
for i in range(1, len(hiddens), 2):
logger.log(['updating layer',i])
simple_update_layer(hiddens, None, i, add_noise = noisy)
# Even layer update
# p_X_chain is given to append the p(X|...) at each full update (one update = odd update + even update)
def update_even_layers(hiddens, p_X_chain, noisy):
for i in range(0, len(hiddens), 2):
logger.log(['updating layer',i])
simple_update_layer(hiddens, p_X_chain, i, add_noise = noisy)
# The layer update function
# hiddens : list containing the symbolic theano variables [visible, hidden1, hidden2, ...]
# layer_update will modify this list inplace
# p_X_chain : list containing the successive p(X|...) at each update
# update_layer will append to this list
# add_noise : pre and post activation gaussian noise
def simple_update_layer(hiddens, p_X_chain, i, add_noise=True):
# Compute the dot product, whatever layer
# If the visible layer X
if i == 0:
logger.log('using '+str(weights_list[i])+'.T')
hiddens[i] = T.dot(hiddens[i+1], weights_list[i].T) + bias_list[i]
# If the top layer
elif i == len(hiddens)-1:
logger.log(['using',weights_list[i-1]])
hiddens[i] = T.dot(hiddens[i-1], weights_list[i-1]) + bias_list[i]
# Otherwise in-between layers
else:
logger.log("using {0!s} and {1!s}.T".format(weights_list[i-1], weights_list[i]))
# next layer : hiddens[i+1], assigned weights : W_i
# previous layer : hiddens[i-1], assigned weights : W_(i-1)
hiddens[i] = T.dot(hiddens[i+1], weights_list[i].T) + T.dot(hiddens[i-1], weights_list[i-1]) + bias_list[i]
# Add pre-activation noise if NOT input layer
if i==1 and state.noiseless_h1:
logger.log('>>NO noise in first hidden layer')
add_noise = False
# pre activation noise
if i != 0 and add_noise:
logger.log(['Adding pre-activation gaussian noise for layer', i])
hiddens[i] = add_gaussian_noise(hiddens[i], state.hidden_add_noise_sigma)
# ACTIVATION!
if i == 0:
logger.log('{} activation for visible layer'.format(state.visible_act))
hiddens[i] = visible_activation(hiddens[i])
else:
logger.log(['Hidden units {} activation for layer'.format(state.hidden_act), i])
hiddens[i] = hidden_activation(hiddens[i])
# post activation noise
# why is there post activation noise? Because there is already pre-activation noise, this just doubles the amount of noise between each activation of the hiddens.
if i != 0 and add_noise:
logger.log(['Adding post-activation gaussian noise for layer', i])
hiddens[i] = add_gaussian_noise(hiddens[i], state.hidden_add_noise_sigma)
# build the reconstruction chain if updating the visible layer X
if i == 0:
# if input layer -> append p(X|...)
p_X_chain.append(hiddens[i])
# sample from p(X|...) - SAMPLING NEEDS TO BE CORRECT FOR INPUT TYPES I.E. FOR BINARY MNIST SAMPLING IS BINOMIAL. real-valued inputs should be gaussian
if state.input_sampling:
logger.log('Sampling from input')
sampled = MRG.binomial(p = hiddens[i], size=hiddens[i].shape, dtype='float32')
else:
logger.log('>>NO input sampling')
sampled = hiddens[i]
# add noise
sampled = salt_and_pepper(sampled, state.input_salt_and_pepper)
# set input layer
hiddens[i] = sampled
##############################################
# Build the training graph for the GSN #
##############################################
# the loop step for the rnn-gsn, return the sample and the costs
def create_gsn_reverse(x_t, u_tm1, noiseflag=True):
chain = []
# init hiddens from the u
hiddens_t = [T.zeros_like(x_t)]
for layer, w in enumerate(weights_list):
layer = layer+1
# if this is an even layer, just append zeros
if layer%2 == 0:
hiddens_t.append(T.zeros_like(T.dot(hiddens_t[-1], w)))
# if it is an odd layer, use the rnn to determine the layer
else:
hiddens_t.append(hidden_activation(T.dot(u_tm1, recurrent_to_gsn_weights_list[layer/2]) + bias_list[layer]))
for i in range(walkbacks):
logger.log("Reverse Walkback {!s}/{!s} for RNN-GSN".format(i+1,walkbacks))
update_layers_reverse(hiddens_t, chain, noiseflag)
x_sample = chain[-1]
costs = [cost_function(rX, x_t) for rX in chain]
show_cost = costs[-1]
cost = T.sum(costs)
return x_sample, cost, show_cost
# the GSN graph for the rnn-gsn
def build_gsn_given_u(xs, u, noiseflag=True):
logger.log("Creating recurrent gsn step scan.\n")
u0 = T.zeros((1,state.recurrent_hidden_size))
if u is None:
u = u0
else:
u = T.concatenate([u0,u]) #add the initial u condition to the list of u's created from the recurrent scan op.
(samples, costs, show_costs), updates = theano.scan(lambda x_t, u_tm1: create_gsn_reverse(x_t, u_tm1, noiseflag),
sequences = [xs, u])
cost = T.sum(costs)
show_cost = T.mean(show_costs)
last_sample = samples[-1]
return last_sample, cost, show_cost, updates
def build_gsn_given_u0(x, u0, noiseflag=True):
x_sample, _, _ = create_gsn_reverse(x, u0, noiseflag)
return x_sample
# the GSN graph for initial GSN training
def build_gsn_graph(x, noiseflag):
p_X_chain = []
if noiseflag:
X_init = salt_and_pepper(x, state.input_salt_and_pepper)
else:
X_init = x
# init hiddens with zeros
hiddens = [X_init]
for w in weights_list:
hiddens.append(T.zeros_like(T.dot(hiddens[-1], w)))
# The layer update scheme
logger.log(["Building the gsn graph :", walkbacks,"updates"])
for i in range(walkbacks):
logger.log("GSN Walkback {!s}/{!s}".format(i+1,walkbacks))
update_layers(hiddens, p_X_chain, noisy=noiseflag)
return p_X_chain
'''Build the actual gsn training graph'''
p_X_chain_gsn = build_gsn_graph(X, noiseflag=True)
##############################################
# Build the training graph for the RNN-GSN #
##############################################
# If `x_t` is given, deterministic recurrence to compute the u_t. Otherwise, first generate
def recurrent_step(x_t, u_tm1):
ua_t = T.dot(x_t, W_x_u) + T.dot(u_tm1, W_u_u) + recurrent_bias
u_t = recurrent_hidden_activation(ua_t)
return ua_t, u_t
logger.log("\nCreating recurrent step scan.")
# For training, the deterministic recurrence is used to compute all the
# {h_t, 1 <= t <= T} given Xs. Conditional GSNs can then be trained
# in batches using those parameters.
u0 = T.zeros((state.recurrent_hidden_size,)) # initial value for the RNN hidden units
(_, u), updates_recurrent = theano.scan(lambda x_t, u_tm1: recurrent_step(x_t, u_tm1),
sequences=Xs,
outputs_info=[None, u0])
_, cost, show_cost, updates_gsn = build_gsn_given_u(Xs, u, noiseflag=True)
updates_recurrent.update(updates_gsn)
updates_train = updates_recurrent
updates_cost = updates_recurrent
################################################
# Build the checkpoint graph for the RNN-GSN #
################################################
# Used to generate the next predicted output given all previous inputs - starting with nothing
# When there is no X history
x_sample_R_init = build_gsn_given_u0(X, u0, noiseflag=False)
# When there is some number of Xs history
x_sample_R, _, _, updates_gsn_R = build_gsn_given_u(Xs, u, noiseflag=False)
#############
# COSTS #
#############
logger.log("")
logger.log('Cost w.r.t p(X|...) at every step in the graph')
gsn_costs = [cost_function(rX, X) for rX in p_X_chain_gsn]
gsn_show_cost = gsn_costs[-1]
gsn_cost = numpy.sum(gsn_costs)
###################################
# GRADIENTS AND FUNCTIONS FOR GSN #
###################################
logger.log(["params:",params])
logger.log("creating functions...")
start_functions_time = time.time()
gradient_gsn = T.grad(gsn_cost, gsn_params)
gradient_buffer_gsn = [theano.shared(numpy.zeros(param.get_value().shape, dtype='float32')) for param in gsn_params]
m_gradient_gsn = [momentum * gb + (cast32(1) - momentum) * g for (gb, g) in zip(gradient_buffer_gsn, gradient_gsn)]
param_updates_gsn = [(param, param - learning_rate * mg) for (param, mg) in zip(gsn_params, m_gradient_gsn)]
gradient_buffer_updates_gsn = zip(gradient_buffer_gsn, m_gradient_gsn)
grad_updates_gsn = OrderedDict(param_updates_gsn + gradient_buffer_updates_gsn)
f_cost_gsn = theano.function(inputs = [X],
outputs = gsn_show_cost,
on_unused_input='warn')
f_learn_gsn = theano.function(inputs = [X],
updates = grad_updates_gsn,
outputs = gsn_show_cost,
on_unused_input='warn')
#######################################
# GRADIENTS AND FUNCTIONS FOR RNN-GSN #
#######################################
# if we are not using Hessian-free training create the normal sgd functions
if state.hf == 0:
gradient = T.grad(cost, params)
gradient_buffer = [theano.shared(numpy.zeros(param.get_value().shape, dtype='float32')) for param in params]
m_gradient = [momentum * gb + (cast32(1) - momentum) * g for (gb, g) in zip(gradient_buffer, gradient)]
param_updates = [(param, param - learning_rate * mg) for (param, mg) in zip(params, m_gradient)]
gradient_buffer_updates = zip(gradient_buffer, m_gradient)
updates = OrderedDict(param_updates + gradient_buffer_updates)
updates_train.update(updates)
f_learn = theano.function(inputs = [Xs],
updates = updates_train,
outputs = show_cost,
on_unused_input='warn')
f_cost = theano.function(inputs = [Xs],
updates = updates_cost,
outputs = show_cost,
on_unused_input='warn')
logger.log("Training/cost functions done.")
compilation_time = time.time() - start_functions_time
# Show the compile time with appropriate easy-to-read units.
if compilation_time < 60:
logger.log(["Compilation took",compilation_time,"seconds.\n\n"])
elif compilation_time < 3600:
logger.log(["Compilation took",compilation_time/60,"minutes.\n\n"])
else:
logger.log(["Compilation took",compilation_time/3600,"hours.\n\n"])
############################################################################################
# Denoise some numbers : show number, noisy number, predicted number, reconstructed number #
############################################################################################
# Recompile the graph without noise for reconstruction function
# The layer update scheme
logger.log("Creating graph for noisy reconstruction function at checkpoints during training.")
f_recon_init = theano.function(inputs=[X], outputs=x_sample_R_init, on_unused_input='warn')
f_recon = theano.function(inputs=[Xs], outputs=x_sample_R, updates=updates_gsn_R)
# Now do the same but for the GSN in the initial run
p_X_chain_R = build_gsn_graph(X, noiseflag=False)
f_recon_gsn = theano.function(inputs=[X], outputs = p_X_chain_R[-1])
logger.log("Done compiling all functions.")
compilation_time = time.time() - start_functions_time
# Show the compile time with appropriate easy-to-read units.
if compilation_time < 60:
logger.log(["Total time took",compilation_time,"seconds.\n\n"])
elif compilation_time < 3600:
logger.log(["Total time took",compilation_time/60,"minutes.\n\n"])
else:
logger.log(["Total time took",compilation_time/3600,"hours.\n\n"])
############
# Sampling #
############
# a function to add salt and pepper noise
f_noise = theano.function(inputs = [X], outputs = salt_and_pepper(X, state.input_salt_and_pepper))
# the input to the sampling function
X_sample = T.fmatrix("X_sampling")
network_state_input = [X_sample] + [T.fmatrix("H_sampling_"+str(i+1)) for i in range(layers)]
# "Output" state of the network (noisy)
# initialized with input, then we apply updates
network_state_output = [X_sample] + network_state_input[1:]
visible_pX_chain = []
# ONE update
logger.log("Performing one walkback in network state sampling.")
update_layers(network_state_output, visible_pX_chain, noisy=True)
if layers == 1:
f_sample_simple = theano.function(inputs = [X_sample], outputs = visible_pX_chain[-1])
# WHY IS THERE A WARNING????
# because the first odd layers are not used -> directly computed FROM THE EVEN layers
# unused input = warn
f_sample2 = theano.function(inputs = network_state_input, outputs = network_state_output + visible_pX_chain, on_unused_input='warn')
def sample_some_numbers_single_layer():
x0 = test_X.get_value()[:1]
samples = [x0]
x = f_noise(x0)
for i in range(399):
x = f_sample_simple(x)
samples.append(x)
x = numpy.random.binomial(n=1, p=x, size=x.shape).astype('float32')
x = f_noise(x)
return numpy.vstack(samples)
def sampling_wrapper(NSI):
# * is the "splat" operator: It takes a list as input, and expands it into actual positional arguments in the function call.
out = f_sample2(*NSI)
NSO = out[:len(network_state_output)]
vis_pX_chain = out[len(network_state_output):]
return NSO, vis_pX_chain
def sample_some_numbers(N=400):
# The network's initial state
init_vis = test_X.get_value()[:1]
noisy_init_vis = f_noise(init_vis)
network_state = [[noisy_init_vis] + [numpy.zeros((1,len(b.get_value())), dtype='float32') for b in bias_list[1:]]]
visible_chain = [init_vis]
noisy_h0_chain = [noisy_init_vis]
for i in range(N-1):
# feed the last state into the network, compute new state, and obtain visible units expectation chain
net_state_out, vis_pX_chain = sampling_wrapper(network_state[-1])
# append to the visible chain
visible_chain += vis_pX_chain
# append state output to the network state chain
network_state.append(net_state_out)
noisy_h0_chain.append(net_state_out[0])
return numpy.vstack(visible_chain), numpy.vstack(noisy_h0_chain)
def plot_samples(epoch_number, leading_text):
to_sample = time.time()
if layers == 1:
# one layer model
V = sample_some_numbers_single_layer()
else:
V, H0 = sample_some_numbers()
img_samples = PIL.Image.fromarray(tile_raster_images(V, (root_N_input,root_N_input), (20,20)))
fname = outdir+leading_text+'samples_epoch_'+str(epoch_number)+'.png'
img_samples.save(fname)
logger.log('Took ' + str(time.time() - to_sample) + ' to sample 400 numbers')
#############################
# Save the model parameters #
#############################
def save_params_to_file(name, n, gsn_params):
pass
print 'saving parameters...'
save_path = outdir+name+'_params_epoch_'+str(n)+'.pkl'
f = open(save_path, 'wb')
try:
cPickle.dump(gsn_params, f, protocol=cPickle.HIGHEST_PROTOCOL)
finally:
f.close()
def save_params(params):
values = [param.get_value(borrow=True) for param in params]
return values
def restore_params(params, values):
for i in range(len(params)):
params[i].set_value(values[i])
################
# GSN TRAINING #
################
def train_GSN(train_X, train_Y, valid_X, valid_Y, test_X, test_Y):
logger.log("\n-----------TRAINING GSN------------\n")
# TRAINING
n_epoch = state.n_epoch
batch_size = state.gsn_batch_size
STOP = False
counter = 0
learning_rate.set_value(cast32(state.learning_rate)) # learning rate
times = []
best_cost = float('inf')
best_params = None
patience = 0
logger.log(['train X size:',str(train_X.shape.eval())])
logger.log(['valid X size:',str(valid_X.shape.eval())])
logger.log(['test X size:',str(test_X.shape.eval())])
if state.vis_init:
bias_list[0].set_value(logit(numpy.clip(0.9,0.001,train_X.get_value().mean(axis=0))))
if state.test_model:
# If testing, do not train and go directly to generating samples, parzen window estimation, and inpainting
logger.log('Testing : skip training')
STOP = True
while not STOP:
counter += 1
t = time.time()
logger.append([counter,'\t'])
#shuffle the data
data.sequence_mnist_data(train_X, train_Y, valid_X, valid_Y, test_X, test_Y, dataset, rng)
#train
train_costs = []
for i in xrange(len(train_X.get_value(borrow=True)) / batch_size):
x = train_X.get_value()[i * batch_size : (i+1) * batch_size]
cost = f_learn_gsn(x)
train_costs.append([cost])
train_costs = numpy.mean(train_costs)
# record it
logger.append(['Train:',trunc(train_costs),'\t'])
with open(gsn_train_convergence,'a') as f:
f.write("{0!s},".format(train_costs))
f.write("\n")
#valid
valid_costs = []
for i in xrange(len(valid_X.get_value(borrow=True)) / batch_size):
x = valid_X.get_value()[i * batch_size : (i+1) * batch_size]
cost = f_cost_gsn(x)
valid_costs.append([cost])
valid_costs = numpy.mean(valid_costs)
# record it
logger.append(['Valid:',trunc(valid_costs), '\t'])
with open(gsn_valid_convergence,'a') as f:
f.write("{0!s},".format(valid_costs))
f.write("\n")
#test
test_costs = []
for i in xrange(len(test_X.get_value(borrow=True)) / batch_size):
x = test_X.get_value()[i * batch_size : (i+1) * batch_size]
cost = f_cost_gsn(x)
test_costs.append([cost])
test_costs = numpy.mean(test_costs)
# record it
logger.append(['Test:',trunc(test_costs), '\t'])
with open(gsn_test_convergence,'a') as f:
f.write("{0!s},".format(test_costs))
f.write("\n")
#check for early stopping
cost = numpy.sum(valid_costs)
if cost < best_cost*state.early_stop_threshold:
patience = 0
best_cost = cost
# save the parameters that made it the best
best_params = save_params(gsn_params)
else:
patience += 1
if counter >= n_epoch or patience >= state.early_stop_length:
STOP = True
if best_params is not None:
restore_params(gsn_params, best_params)
save_params_to_file('gsn', counter, gsn_params)
timing = time.time() - t
times.append(timing)
logger.append(['time:', trunc(timing)])
logger.log(['remaining:', trunc((n_epoch - counter) * numpy.mean(times) / 60 / 60), 'hrs'])
if (counter % state.save_frequency) == 0 or STOP is True:
n_examples = 100
random_idx = numpy.array(R.sample(range(len(test_X.get_value(borrow=True))), n_examples))
numbers = test_X.get_value(borrow=True)[random_idx]
noisy_numbers = f_noise(test_X.get_value(borrow=True)[random_idx])
reconstructed = f_recon_gsn(noisy_numbers)
# Concatenate stuff
stacked = numpy.vstack([numpy.vstack([numbers[i*10 : (i+1)*10], noisy_numbers[i*10 : (i+1)*10], reconstructed[i*10 : (i+1)*10]]) for i in range(10)])
number_reconstruction = PIL.Image.fromarray(tile_raster_images(stacked, (root_N_input,root_N_input), (10,30)))
number_reconstruction.save(outdir+'gsn_number_reconstruction_epoch_'+str(counter)+'.png')
#sample_numbers(counter, 'seven')
plot_samples(counter, 'gsn')
#save gsn_params
save_params_to_file('gsn', counter, gsn_params)
# ANNEAL!
new_lr = learning_rate.get_value() * annealing
learning_rate.set_value(new_lr)
# 10k samples
print 'Generating 10,000 samples'
samples, _ = sample_some_numbers(N=10000)
f_samples = outdir+'samples.npy'
numpy.save(f_samples, samples)
print 'saved digits'
def train_RNN_GSN(train_X, train_Y, valid_X, valid_Y, test_X, test_Y):
# If we are using Hessian-free training
if state.hf == 1:
pass
# gradient_dataset = hf_sequence_dataset([train_X.get_value()], batch_size=None, number_batches=5000)
# cg_dataset = hf_sequence_dataset([train_X.get_value()], batch_size=None, number_batches=1000)
# valid_dataset = hf_sequence_dataset([valid_X.get_value()], batch_size=None, number_batches=1000)
#
# s = x_samples
# costs = [cost, show_cost]
# hf_optimizer(params, [Xs], s, costs, u, ua).train(gradient_dataset, cg_dataset, initial_lambda=1.0, preconditioner=True, validation=valid_dataset)
# If we are using SGD training
else:
logger.log("\n-----------TRAINING RNN-GSN------------\n")
# TRAINING
n_epoch = state.n_epoch
batch_size = state.batch_size
STOP = False
counter = 0
learning_rate.set_value(cast32(state.learning_rate)) # learning rate
times = []
best_cost = float('inf')
best_params = None
patience = 0
logger.log(['train X size:',str(train_X.shape.eval())])
logger.log(['valid X size:',str(valid_X.shape.eval())])
logger.log(['test X size:',str(test_X.shape.eval())])
if state.vis_init:
bias_list[0].set_value(logit(numpy.clip(0.9,0.001,train_X.get_value().mean(axis=0))))
if state.test_model:
# If testing, do not train and go directly to generating samples, parzen window estimation, and inpainting
logger.log('Testing : skip training')
STOP = True
while not STOP:
counter += 1
t = time.time()
logger.append([counter,'\t'])
#shuffle the data
data.sequence_mnist_data(train_X, train_Y, valid_X, valid_Y, test_X, test_Y, dataset, rng)
#train
train_costs = []
for i in xrange(len(train_X.get_value(borrow=True)) / batch_size):
xs = train_X.get_value(borrow=True)[i * batch_size : (i+1) * batch_size]
cost = f_learn(xs)
train_costs.append([cost])
train_costs = numpy.mean(train_costs)
# record it
logger.append(['Train:',trunc(train_costs),'\t'])
with open(train_convergence,'a') as f:
f.write("{0!s},".format(train_costs))
f.write("\n")
#valid
valid_costs = []
for i in xrange(len(valid_X.get_value(borrow=True)) / batch_size):
xs = valid_X.get_value(borrow=True)[i * batch_size : (i+1) * batch_size]
cost = f_cost(xs)
valid_costs.append([cost])
valid_costs = numpy.mean(valid_costs)
# record it
logger.append(['Valid:',trunc(valid_costs), '\t'])
with open(valid_convergence,'a') as f:
f.write("{0!s},".format(valid_costs))
f.write("\n")
#test
test_costs = []
for i in xrange(len(test_X.get_value(borrow=True)) / batch_size):
xs = test_X.get_value(borrow=True)[i * batch_size : (i+1) * batch_size]
cost = f_cost(xs)
test_costs.append([cost])
test_costs = numpy.mean(test_costs)
# record it
logger.append(['Test:',trunc(test_costs), '\t'])
with open(test_convergence,'a') as f:
f.write("{0!s},".format(test_costs))
f.write("\n")
#check for early stopping
cost = numpy.sum(valid_costs)
if cost < best_cost*state.early_stop_threshold:
patience = 0
best_cost = cost
# save the parameters that made it the best
best_params = save_params(params)
else:
patience += 1
if counter >= n_epoch or patience >= state.early_stop_length:
STOP = True
if best_params is not None:
restore_params(params, best_params)
save_params_to_file('all', counter, params)
timing = time.time() - t
times.append(timing)
logger.append(['time:', trunc(timing)])
logger.log(['remaining:', trunc((n_epoch - counter) * numpy.mean(times) / 60 / 60), 'hrs'])
if (counter % state.save_frequency) == 0 or STOP is True:
n_examples = 100
nums = test_X.get_value(borrow=True)[range(n_examples)]
noisy_nums = f_noise(test_X.get_value(borrow=True)[range(n_examples)])
reconstructions = []
for i in xrange(0, len(noisy_nums)):
if i is 0:
recon = f_recon_init(noisy_nums[:i+1])
else:
recon = f_recon(noisy_nums[max(0,(i+1)-batch_size):i+1])
reconstructions.append(recon)
reconstructed = numpy.array(reconstructions)
# Concatenate stuff
stacked = numpy.vstack([numpy.vstack([nums[i*10 : (i+1)*10], noisy_nums[i*10 : (i+1)*10], reconstructed[i*10 : (i+1)*10]]) for i in range(10)])
number_reconstruction = PIL.Image.fromarray(tile_raster_images(stacked, (root_N_input,root_N_input), (10,30)))
number_reconstruction.save(outdir+'rnngsn_number_reconstruction_epoch_'+str(counter)+'.png')
#sample_numbers(counter, 'seven')
plot_samples(counter, 'rnngsn')
#save params
save_params_to_file('all', counter, params)
# ANNEAL!
new_lr = learning_rate.get_value() * annealing
learning_rate.set_value(new_lr)
# 10k samples
print 'Generating 10,000 samples'
samples, _ = sample_some_numbers(N=10000)
f_samples = outdir+'samples.npy'
numpy.save(f_samples, samples)
print 'saved digits'
#####################
# STORY 2 ALGORITHM #
#####################
# train the GSN parameters first to get a good baseline (if not loaded from parameter .pkl file)
if initialized_gsn is False:
train_GSN(train_X, train_Y, valid_X, valid_Y, test_X, test_Y)
# train the entire RNN-GSN
train_RNN_GSN(train_X, train_Y, valid_X, valid_Y, test_X, test_Y)
def train(self, batch_size=100, num_epochs=300):
'''Train the RNN-RBM via stochastic gradient descent (SGD) using MIDI
files converted to piano-rolls.
files : list of strings
List of MIDI files that will be loaded as piano-rolls for training.
batch_size : integer
Training sequences will be split into subsequences of at most this size
before applying the SGD updates.
num_epochs : integer
Number of epochs (pass over the training set) performed. The user can
safely interrupt training with Ctrl+C at any time.'''
(train_X, train_Y), (valid_X, valid_Y), (test_X, test_Y) = data.load_mnist("../datasets/")
train_X = numpy.concatenate((train_X, valid_X))
train_Y = numpy.concatenate((train_Y, valid_Y))
print
'Sequencing MNIST data...'
print
'train set size:', train_X.shape
print
'valid set size:', valid_X.shape
print
'test set size:', test_X.shape
train_X = theano.shared(train_X)
train_Y = theano.shared(train_Y)
valid_X = theano.shared(valid_X)
valid_Y = theano.shared(valid_Y)
test_X = theano.shared(test_X)
test_Y = theano.shared(test_Y)
data.sequence_mnist_data(train_X, train_Y, valid_X, valid_Y, test_X, test_Y, dataset=4)
print
'train set size:', train_X.shape.eval()
print
'valid set size:', valid_X.shape.eval()
print
'test set size:', test_X.shape.eval()
print
'Sequencing done.'
print
N_input = train_X.eval().shape[1]
self.root_N_input = numpy.sqrt(N_input)
times = []
try:
for epoch in xrange(num_epochs):
t = time.time()
print
'Epoch %i/%i : ' % (epoch + 1, num_epochs)
# sequence_mnist_data(train_X, train_Y, valid_X, valid_Y, test_X, test_Y)
accuracy = []
costs = []
crossentropy = []
tests = []
test_acc = []
for i in range(len(train_X.get_value(borrow=True)) / batch_size):
t0=time.time()
xs = train_X.get_value(borrow=True)[(i * batch_size): ((i + 1) * batch_size)]
acc, cost, cross = self.train_function(xs)
accuracy.append(acc)
costs.append(cost)
crossentropy.append(cross)
print time.time()-t0
print 'Train',numpy.mean(accuracy), 'cost', numpy.mean(costs), 'cross', numpy.mean(crossentropy),
for i in range(len(test_X.get_value(borrow=True)) / batch_size):
xs = train_X.get_value(borrow=True)[(i * batch_size): ((i + 1) * batch_size)]
acc, cost = self.test_function(xs)
test_acc.append(acc)
tests.append(cost)
print
'\t Test_acc', numpy.mean(test_acc), "cross", numpy.mean(tests)
timing = time.time() - t
times.append(timing)
print
'time : ', trunc(timing),
print
'remaining: ', (num_epochs - (epoch + 1)) * numpy.mean(times) / 60 / 60, 'hrs'
sys.stdout.flush()
# new learning rate
new_lr = self.lr.get_value() * self.annealing
self.lr.set_value(new_lr)
except KeyboardInterrupt:
print
'Interrupted by user.'
def experiment(state, outdir_base='./'):
rng.seed(1) # seed the numpy random generator
# Initialize output directory and files
data.mkdir_p(outdir_base)
outdir = outdir_base + "/" + state.dataset + "/"
data.mkdir_p(outdir)
logfile = outdir + "log.txt"
with open(logfile, 'w') as f:
f.write("MODEL 2, {0!s}\n\n".format(state.dataset))
train_convergence_pre = outdir + "train_convergence_pre.csv"
train_convergence_post = outdir + "train_convergence_post.csv"
valid_convergence_pre = outdir + "valid_convergence_pre.csv"
valid_convergence_post = outdir + "valid_convergence_post.csv"
test_convergence_pre = outdir + "test_convergence_pre.csv"
test_convergence_post = outdir + "test_convergence_post.csv"
print
print
"----------MODEL 2, {0!s}--------------".format(state.dataset)
print
# load parameters from config file if this is a test
config_filename = outdir + 'config'
if state.test_model and 'config' in os.listdir(outdir):
config_vals = load_from_config(config_filename)
for CV in config_vals:
print
CV
if CV.startswith('test'):
print
'Do not override testing switch'
continue
try:
exec('state.' + CV) in globals(), locals()
except:
exec('state.' + CV.split('=')[0] + "='" + CV.split('=')[1] + "'") in globals(), locals()
else:
# Save the current configuration
# Useful for logs/experiments
print
'Saving config'
with open(config_filename, 'w') as f:
f.write(str(state))
print
state
# Load the data, train = train+valid, and sequence
artificial = False
if state.dataset == 'MNIST_1' or state.dataset == 'MNIST_2' or state.dataset == 'MNIST_3':
(train_X, train_Y), (valid_X, valid_Y), (test_X, test_Y) = data.load_mnist(state.data_path)
train_X = numpy.concatenate((train_X, valid_X))
train_Y = numpy.concatenate((train_Y, valid_Y))
artificial = True
try:
dataset = int(state.dataset.split('_')[1])
except:
raise AssertionError("artificial dataset number not recognized. Input was " + state.dataset)
else:
raise AssertionError("dataset not recognized.")
train_X = theano.shared(train_X)
train_Y = theano.shared(train_Y)
valid_X = theano.shared(valid_X)
valid_Y = theano.shared(valid_Y)
test_X = theano.shared(test_X)
test_Y = theano.shared(test_Y)
if artificial:
print
'Sequencing MNIST data...'
print
'train set size:', len(train_Y.eval())
print
'valid set size:', len(valid_Y.eval())
print
'test set size:', len(test_Y.eval())
data.sequence_mnist_data(train_X, train_Y, valid_X, valid_Y, test_X, test_Y, dataset, rng)
print
'train set size:', len(train_Y.eval())
print
'valid set size:', len(valid_Y.eval())
print
'test set size:', len(test_Y.eval())
print
'Sequencing done.'
print
N_input = train_X.eval().shape[1]
root_N_input = numpy.sqrt(N_input)
# Network and training specifications
layers = state.layers # number hidden layers
walkbacks = state.walkbacks # number of walkbacks
layer_sizes = [N_input] + [state.hidden_size] * layers # layer sizes, from h0 to hK (h0 is the visible layer)
learning_rate = theano.shared(cast32(state.learning_rate)) # learning rate
annealing = cast32(state.annealing) # exponential annealing coefficient
momentum = theano.shared(cast32(state.momentum)) # momentum term
# PARAMETERS : weights list and bias list.
# initialize a list of weights and biases based on layer_sizes
weights_list = [get_shared_weights(layer_sizes[i], layer_sizes[i + 1], name="W_{0!s}_{1!s}".format(i, i + 1)) for i
in range(layers)] # initialize each layer to uniform sample from sqrt(6. / (n_in + n_out))
recurrent_weights_list = [
get_shared_weights(layer_sizes[i + 1], layer_sizes[i], name="V_{0!s}_{1!s}".format(i + 1, i)) for i in
range(layers)] # initialize each layer to uniform sample from sqrt(6. / (n_in + n_out))
bias_list = [get_shared_bias(layer_sizes[i], name='b_' + str(i)) for i in
range(layers + 1)] # initialize each layer to 0's.
# Theano variables and RNG
MRG = RNG_MRG.MRG_RandomStreams(1)
X = T.fmatrix('X')
Xs = [T.fmatrix(name="X_initial") if i == 0 else T.fmatrix(name="X_" + str(i + 1)) for i in range(walkbacks + 1)]
hiddens_input = [X] + [T.fmatrix(name="h_" + str(i + 1)) for i in range(layers)]
hiddens_output = hiddens_input[:1] + hiddens_input[1:]
# Check variables for bad inputs and stuff
if state.batch_size > len(Xs):
warnings.warn(
"Batch size should not be bigger than walkbacks+1 (len(Xs)) unless you know what you're doing. You need to know the sequence length beforehand.")
if state.batch_size <= 0:
raise AssertionError("batch size cannot be <= 0")
''' F PROP '''
if state.hidden_act == 'sigmoid':
print
'Using sigmoid activation for hiddens'
hidden_activation = T.nnet.sigmoid
elif state.hidden_act == 'rectifier':
print
'Using rectifier activation for hiddens'
hidden_activation = lambda x: T.maximum(cast32(0), x)
elif state.hidden_act == 'tanh':
print
'Using hyperbolic tangent activation for hiddens'
hidden_activation = lambda x: T.tanh(x)
else:
raise AssertionError("Did not recognize hidden activation {0!s}, please use tanh, rectifier, or sigmoid".format(
state.hidden_act))
if state.visible_act == 'sigmoid':
print
'Using sigmoid activation for visible layer'
visible_activation = T.nnet.sigmoid
elif state.visible_act == 'softmax':
print
'Using softmax activation for visible layer'
visible_activation = T.nnet.softmax
else:
raise AssertionError(
"Did not recognize visible activation {0!s}, please use sigmoid or softmax".format(state.visible_act))
def update_layers(hiddens, p_X_chain, Xs, sequence_idx, noisy=True, sampling=True):
print
'odd layer updates'
update_odd_layers(hiddens, noisy)
print
'even layer updates'
update_even_layers(hiddens, p_X_chain, Xs, sequence_idx, noisy, sampling)
# choose the correct output for hidden_outputs based on batch_size and walkbacks (this is due to an issue with batches, see note in run_story2.py)
if state.batch_size <= len(Xs) and sequence_idx == state.batch_size - 1:
return hiddens
else:
return None
print
'done full update.'
print
# Odd layer update function
# just a loop over the odd layers
def update_odd_layers(hiddens, noisy):
for i in range(1, len(hiddens), 2):
print
'updating layer', i
simple_update_layer(hiddens, None, None, None, i, add_noise=noisy)
# Even layer update
# p_X_chain is given to append the p(X|...) at each full update (one update = odd update + even update)
def update_even_layers(hiddens, p_X_chain, Xs, sequence_idx, noisy, sampling):
for i in range(0, len(hiddens), 2):
print
'updating layer', i
simple_update_layer(hiddens, p_X_chain, Xs, sequence_idx, i, add_noise=noisy, input_sampling=sampling)
# The layer update function
# hiddens : list containing the symbolic theano variables [visible, hidden1, hidden2, ...]
# layer_update will modify this list inplace
# p_X_chain : list containing the successive p(X|...) at each update
# update_layer will append to this list
# add_noise : pre and post activation gaussian noise
def simple_update_layer(hiddens, p_X_chain, Xs, sequence_idx, i, add_noise=True, input_sampling=True):
# Compute the dot product, whatever layer
# If the visible layer X
if i == 0:
print
'using', recurrent_weights_list[i]
hiddens[i] = (T.dot(hiddens[i + 1], recurrent_weights_list[i]) + bias_list[i])
# If the top layer
elif i == len(hiddens) - 1:
print
'using', weights_list[i - 1]
hiddens[i] = T.dot(hiddens[i - 1], weights_list[i - 1]) + bias_list[i]
# Otherwise in-between layers
else:
# next layer : hiddens[i+1], assigned weights : W_i
# previous layer : hiddens[i-1], assigned weights : W_(i-1)
print
"using {0!s} and {1!s}".format(weights_list[i - 1], recurrent_weights_list[i])
hiddens[i] = T.dot(hiddens[i + 1], recurrent_weights_list[i]) + T.dot(hiddens[i - 1], weights_list[i - 1]) + \
bias_list[i]
# Add pre-activation noise if NOT input layer
if i == 1 and state.noiseless_h1:
print
'>>NO noise in first hidden layer'
add_noise = False
# pre activation noise
if i != 0 and add_noise:
print
'Adding pre-activation gaussian noise for layer', i
hiddens[i] = add_gaussian_noise(hiddens[i], state.hidden_add_noise_sigma)
# ACTIVATION!
if i == 0:
print
'Sigmoid units activation for visible layer X'
hiddens[i] = visible_activation(hiddens[i])
else:
print
'Hidden units {} activation for layer'.format(state.act), i
hiddens[i] = hidden_activation(hiddens[i])
# post activation noise
# why is there post activation noise? Because there is already pre-activation noise, this just doubles the amount of noise between each activation of the hiddens.
# if i != 0 and add_noise:
# print 'Adding post-activation gaussian noise for layer', i
# hiddens[i] = add_gaussian(hiddens[i], state.hidden_add_noise_sigma)
# build the reconstruction chain if updating the visible layer X
if i == 0:
# if input layer -> append p(X|...)
p_X_chain.append(hiddens[i]) # what the predicted next input should be
if sequence_idx + 1 < len(Xs):
next_input = Xs[sequence_idx + 1]
# sample from p(X|...) - SAMPLING NEEDS TO BE CORRECT FOR INPUT TYPES I.E. FOR BINARY MNIST SAMPLING IS BINOMIAL. real-valued inputs should be gaussian
if input_sampling:
print
'Sampling from input'
sampled = MRG.binomial(p=next_input, size=next_input.shape, dtype='float32')
else:
print
'>>NO input sampling'
sampled = next_input
# add noise
sampled = salt_and_pepper(sampled, state.input_salt_and_pepper)
# DOES INPUT SAMPLING MAKE SENSE FOR SEQUENTIAL? - not really since it was used in walkbacks which was gibbs.
# set input layer
hiddens[i] = sampled
def build_graph(hiddens, Xs, noisy=True, sampling=True):
predicted_X_chain = [] # the visible layer that gets generated at each update_layers run
H_chain = [] # either None or hiddens that gets generated at each update_layers run, this is used to determine what the correct hiddens_output should be
print
"Building the graph :", walkbacks, "updates"
for i in range(walkbacks):
print
"Forward Prediction {!s}/{!s}".format(i + 1, walkbacks)
H_chain.append(update_layers(hiddens, predicted_X_chain, Xs, i, noisy, sampling))
return predicted_X_chain, H_chain
'''Build the main training graph'''
# corrupt x
hiddens_output[0] = salt_and_pepper(hiddens_output[0], state.input_salt_and_pepper)
# build the computation graph and the generated visible layers and appropriate hidden_output
predicted_X_chain, H_chain = build_graph(hiddens_output, Xs, noisy=True, sampling=state.input_sampling)
# predicted_X_chain, H_chain = build_graph(hiddens_output, Xs, noisy=False, sampling=state.input_sampling) #testing one-hot without noise
# choose the correct output for hiddens_output (this is due to the issue with batches - see note in run_story2.py)
# this finds the not-None element of H_chain and uses that for hiddens_output
h_empty = [True if h is None else False for h in H_chain]
if False in h_empty: # if there was a not-None element
hiddens_output = H_chain[h_empty.index(False)] # set hiddens_output to the appropriate element from H_chain
######################
# COST AND GRADIENTS #
######################
print
if state.cost_funct == 'binary_crossentropy':
print
'Using binary cross-entropy cost!'
cost_function = lambda x, y: T.mean(T.nnet.binary_crossentropy(x, y))
elif state.cost_funct == 'square':
print
"Using square error cost!"
cost_function = lambda x, y: T.mean(T.sqr(x - y))
else:
raise AssertionError(
"Did not recognize cost function {0!s}, please use binary_crossentropy or square".format(state.cost_funct))
print
'Cost w.r.t p(X|...) at every step in the graph'
costs = [cost_function(predicted_X_chain[i], Xs[i + 1]) for i in range(len(predicted_X_chain))]
# outputs for the functions
show_COSTs = [costs[0]] + [costs[-1]]
# cost for the gradient
# care more about the immediate next predictions rather than the future - use exponential decay
# COST = T.sum(costs)
COST = T.sum([T.exp(-i / T.ceil(walkbacks / 3)) * costs[i] for i in range(len(costs))])
params = weights_list + recurrent_weights_list + bias_list
print
"params:", params
print
"creating functions..."
gradient = T.grad(COST, params)
gradient_buffer = [theano.shared(numpy.zeros(param.get_value().shape, dtype='float32')) for param in params]
m_gradient = [momentum * gb + (cast32(1) - momentum) * g for (gb, g) in zip(gradient_buffer, gradient)]
param_updates = [(param, param - learning_rate * mg) for (param, mg) in zip(params, m_gradient)]
gradient_buffer_updates = zip(gradient_buffer, m_gradient)
updates = OrderedDict(param_updates + gradient_buffer_updates)
# odd layer h's not used from input -> calculated directly from even layers (starting with h_0) since the odd layers are updated first.
f_cost = theano.function(inputs=hiddens_input + Xs,
outputs=hiddens_output + show_COSTs,
on_unused_input='warn')
f_learn = theano.function(inputs=hiddens_input + Xs,
updates=updates,
outputs=hiddens_output + show_COSTs,
on_unused_input='warn')
print
"functions done."
print
#############
# Denoise some numbers : show number, noisy number, reconstructed number
#############
import random as R
R.seed(1)
# a function to add salt and pepper noise
f_noise = theano.function(inputs=[X], outputs=salt_and_pepper(X, state.input_salt_and_pepper))
# Recompile the graph without noise for reconstruction function - the input x_recon is already going to be noisy, and this is to test on a simulated 'real' input.
X_recon = T.fvector("X_recon")
Xs_recon = [T.fvector("Xs_recon")]
hiddens_R_input = [X_recon] + [T.fvector(name="h_recon_" + str(i + 1)) for i in range(layers)]
hiddens_R_output = hiddens_R_input[:1] + hiddens_R_input[1:]
# The layer update scheme
print
"Creating graph for noisy reconstruction function at checkpoints during training."
p_X_chain_R, H_chain_R = build_graph(hiddens_R_output, Xs_recon, noisy=False)
# choose the correct output from H_chain for hidden_outputs based on batch_size and walkbacks
# choose the correct output for hiddens_output
h_empty = [True if h is None else False for h in H_chain_R]
if False in h_empty: # if there was a set of hiddens output from the batch_size-1 element of the chain
hiddens_R_output = H_chain_R[
h_empty.index(False)] # extract out the not-None element from the list if it exists
# if state.batch_size <= len(Xs_recon):
# for i in range(len(hiddens_R_output)):
# hiddens_R_output[i] = H_chain_R[state.batch_size - 1][i]
f_recon = theano.function(inputs=hiddens_R_input + Xs_recon,
outputs=hiddens_R_output + [p_X_chain_R[0], p_X_chain_R[-1]],
on_unused_input="warn")
############
# Sampling #
############
# the input to the sampling function
X_sample = T.fmatrix("X_sampling")
network_state_input = [X_sample] + [T.fmatrix("H_sampling_" + str(i + 1)) for i in range(layers)]
# "Output" state of the network (noisy)
# initialized with input, then we apply updates
network_state_output = [X_sample] + network_state_input[1:]
visible_pX_chain = []
# ONE update
print
"Performing one walkback in network state sampling."
_ = update_layers(network_state_output, visible_pX_chain, [X_sample], 0, noisy=True)
if layers == 1:
f_sample_simple = theano.function(inputs=[X_sample], outputs=visible_pX_chain[-1])
# WHY IS THERE A WARNING????
# because the first odd layers are not used -> directly computed FROM THE EVEN layers
# unused input = warn
f_sample2 = theano.function(inputs=network_state_input, outputs=network_state_output + visible_pX_chain,
on_unused_input='warn')
def sample_some_numbers_single_layer():
x0 = test_X.get_value()[:1]
samples = [x0]
x = f_noise(x0)
for i in range(399):
x = f_sample_simple(x)
samples.append(x)
x = numpy.random.binomial(n=1, p=x, size=x.shape).astype('float32')
x = f_noise(x)
return numpy.vstack(samples)
def sampling_wrapper(NSI):
# * is the "splat" operator: It takes a list as input, and expands it into actual positional arguments in the function call.
out = f_sample2(*NSI)
NSO = out[:len(network_state_output)]
vis_pX_chain = out[len(network_state_output):]
return NSO, vis_pX_chain
def sample_some_numbers(N=400):
# The network's initial state
init_vis = test_X.get_value()[:1]
noisy_init_vis = f_noise(init_vis)
network_state = [
[noisy_init_vis] + [numpy.zeros((1, len(b.get_value())), dtype='float32') for b in bias_list[1:]]]
visible_chain = [init_vis]
noisy_h0_chain = [noisy_init_vis]
for i in range(N - 1):
# feed the last state into the network, compute new state, and obtain visible units expectation chain
net_state_out, vis_pX_chain = sampling_wrapper(network_state[-1])
# append to the visible chain
visible_chain += vis_pX_chain
# append state output to the network state chain
network_state.append(net_state_out)
noisy_h0_chain.append(net_state_out[0])
return numpy.vstack(visible_chain), numpy.vstack(noisy_h0_chain)
def plot_samples(epoch_number, iteration):
to_sample = time.time()
if layers == 1:
# one layer model
V = sample_some_numbers_single_layer()
else:
V, H0 = sample_some_numbers()
img_samples = PIL.Image.fromarray(tile_raster_images(V, (root_N_input, root_N_input), (20, 20)))
fname = outdir + 'samples_iteration_' + str(iteration) + '_epoch_' + str(epoch_number) + '.png'
img_samples.save(fname)
print
'Took ' + str(time.time() - to_sample) + ' to sample 400 numbers'
##############
# Inpainting #
##############
def inpainting(digit):
# The network's initial state
# NOISE INIT
init_vis = cast32(numpy.random.uniform(size=digit.shape))
# noisy_init_vis = f_noise(init_vis)
# noisy_init_vis = cast32(numpy.random.uniform(size=init_vis.shape))
# INDEXES FOR VISIBLE AND NOISY PART
noise_idx = (numpy.arange(N_input) % root_N_input < (root_N_input / 2))
fixed_idx = (numpy.arange(N_input) % root_N_input > (root_N_input / 2))
# function to re-init the visible to the same noise
# FUNCTION TO RESET HALF VISIBLE TO DIGIT
def reset_vis(V):
V[0][fixed_idx] = digit[0][fixed_idx]
return V
# INIT DIGIT : NOISE and RESET HALF TO DIGIT
init_vis = reset_vis(init_vis)
network_state = [[init_vis] + [numpy.zeros((1, len(b.get_value())), dtype='float32') for b in bias_list[1:]]]
visible_chain = [init_vis]
noisy_h0_chain = [init_vis]
for i in range(49):
# feed the last state into the network, compute new state, and obtain visible units expectation chain
net_state_out, vis_pX_chain = sampling_wrapper(network_state[-1])
# reset half the digit
net_state_out[0] = reset_vis(net_state_out[0])
vis_pX_chain[0] = reset_vis(vis_pX_chain[0])
# append to the visible chain
visible_chain += vis_pX_chain
# append state output to the network state chain
network_state.append(net_state_out)
noisy_h0_chain.append(net_state_out[0])
return numpy.vstack(visible_chain), numpy.vstack(noisy_h0_chain)
def save_params_to_file(name, n, params, iteration):
print
'saving parameters...'
save_path = outdir + name + '_params_iteration_' + str(iteration) + '_epoch_' + str(n) + '.pkl'
f = open(save_path, 'wb')
try:
cPickle.dump(params, f, protocol=cPickle.HIGHEST_PROTOCOL)
finally:
f.close()
################
# GSN TRAINING #
################
def train_recurrent_GSN(iteration, train_X, train_Y, valid_X, valid_Y, test_X, test_Y):
print
'----------------------------------------'
print
'TRAINING GSN FOR ITERATION', iteration
with open(logfile, 'a') as f:
f.write("--------------------------\nTRAINING GSN FOR ITERATION {0!s}\n".format(iteration))
# TRAINING
n_epoch = state.n_epoch
batch_size = state.batch_size
STOP = False
counter = 0
if iteration == 0:
learning_rate.set_value(cast32(state.learning_rate)) # learning rate
times = []
best_cost = float('inf')
patience = 0
print
'learning rate:', learning_rate.get_value()
print
'train X size:', str(train_X.shape.eval())
print
'valid X size:', str(valid_X.shape.eval())
print
'test X size:', str(test_X.shape.eval())
train_costs = []
valid_costs = []
test_costs = []
train_costs_post = []
valid_costs_post = []
test_costs_post = []
if state.vis_init:
bias_list[0].set_value(logit(numpy.clip(0.9, 0.001, train_X.get_value().mean(axis=0))))
if state.test_model:
# If testing, do not train and go directly to generating samples, parzen window estimation, and inpainting
print
'Testing : skip training'
STOP = True
while not STOP:
counter += 1
t = time.time()
print
counter, '\t',
with open(logfile, 'a') as f:
f.write("{0!s}\t".format(counter))
# shuffle the data
data.sequence_mnist_data(train_X, train_Y, valid_X, valid_Y, test_X, test_Y, dataset, rng)
# train
# init hiddens
# hiddens = [(T.zeros_like(train_X[:batch_size]).eval())]
# for i in range(len(weights_list)):
# # init with zeros
# hiddens.append(T.zeros_like(T.dot(hiddens[i], weights_list[i])).eval())
hiddens = [T.zeros((batch_size, layer_size)).eval() for layer_size in layer_sizes]
train_cost = []
train_cost_post = []
for i in range(len(train_X.get_value(borrow=True)) / batch_size):
xs = [train_X.get_value(borrow=True)[
(i * batch_size) + sequence_idx: ((i + 1) * batch_size) + sequence_idx] for sequence_idx in
range(len(Xs))]
xs, hiddens = fix_input_size(xs, hiddens)
hiddens[0] = xs[0]
_ins = hiddens + xs
_outs = f_learn(*_ins)
hiddens = _outs[:len(hiddens)]
cost = _outs[-2]
cost_post = _outs[-1]
train_cost.append(cost)
train_cost_post.append(cost_post)
train_cost = numpy.mean(train_cost)
train_costs.append(train_cost)
train_cost_post = numpy.mean(train_cost_post)
train_costs_post.append(train_cost_post)
print
'Train : ', trunc(train_cost), trunc(train_cost_post), '\t',
with open(logfile, 'a') as f:
f.write("Train : {0!s} {1!s}\t".format(trunc(train_cost), trunc(train_cost_post)))
with open(train_convergence_pre, 'a') as f:
f.write("{0!s},".format(train_cost))
with open(train_convergence_post, 'a') as f:
f.write("{0!s},".format(train_cost_post))
# valid
# init hiddens
hiddens = [T.zeros((batch_size, layer_size)).eval() for layer_size in layer_sizes]
valid_cost = []
valid_cost_post = []
for i in range(len(valid_X.get_value(borrow=True)) / batch_size):
xs = [valid_X.get_value(borrow=True)[
(i * batch_size) + sequence_idx: ((i + 1) * batch_size) + sequence_idx] for sequence_idx in
range(len(Xs))]
xs, hiddens = fix_input_size(xs, hiddens)
hiddens[0] = xs[0]
_ins = hiddens + xs
_outs = f_cost(*_ins)
hiddens = _outs[:-2]
cost = _outs[-2]
cost_post = _outs[-1]
valid_cost.append(cost)
valid_cost_post.append(cost_post)
valid_cost = numpy.mean(valid_cost)
valid_costs.append(valid_cost)
valid_cost_post = numpy.mean(valid_cost_post)
valid_costs_post.append(valid_cost_post)
print
'Valid : ', trunc(valid_cost), trunc(valid_cost_post), '\t',
with open(logfile, 'a') as f:
f.write("Valid : {0!s} {1!s}\t".format(trunc(valid_cost), trunc(valid_cost_post)))
with open(valid_convergence_pre, 'a') as f:
f.write("{0!s},".format(valid_cost))
with open(valid_convergence_post, 'a') as f:
f.write("{0!s},".format(valid_cost_post))
# test
# init hiddens
hiddens = [T.zeros((batch_size, layer_size)).eval() for layer_size in layer_sizes]
test_cost = []
test_cost_post = []
for i in range(len(test_X.get_value(borrow=True)) / batch_size):
xs = [test_X.get_value(borrow=True)[
(i * batch_size) + sequence_idx: ((i + 1) * batch_size) + sequence_idx] for sequence_idx in
range(len(Xs))]
xs, hiddens = fix_input_size(xs, hiddens)
hiddens[0] = xs[0]
_ins = hiddens + xs
_outs = f_cost(*_ins)
hiddens = _outs[:-2]
cost = _outs[-2]
cost_post = _outs[-1]
test_cost.append(cost)
test_cost_post.append(cost_post)
test_cost = numpy.mean(test_cost)
test_costs.append(test_cost)
test_cost_post = numpy.mean(test_cost_post)
test_costs_post.append(test_cost_post)
print
'Test : ', trunc(test_cost), trunc(test_cost_post), '\t',
with open(logfile, 'a') as f:
f.write("Test : {0!s} {1!s}\t".format(trunc(test_cost), trunc(test_cost_post)))
with open(test_convergence_pre, 'a') as f:
f.write("{0!s},".format(test_cost))
with open(test_convergence_post, 'a') as f:
f.write("{0!s},".format(test_cost_post))
# check for early stopping
cost = train_cost
if cost < best_cost * state.early_stop_threshold:
patience = 0
best_cost = cost
else:
patience += 1
if counter >= n_epoch or patience >= state.early_stop_length:
STOP = True
save_params_to_file('gsn', counter, params, iteration)
timing = time.time() - t
times.append(timing)
print
'time : ', trunc(timing),
print
'remaining: ', trunc((n_epoch - counter) * numpy.mean(times) / 60 / 60), 'hrs',
print
'B : ', [trunc(abs(b.get_value(borrow=True)).mean()) for b in bias_list],
print
'W : ', [trunc(abs(w.get_value(borrow=True)).mean()) for w in weights_list],
print
'V : ', [trunc(abs(v.get_value(borrow=True)).mean()) for v in recurrent_weights_list]
with open(logfile, 'a') as f:
f.write("MeanVisB : {0!s}\t".format(trunc(bias_list[0].get_value().mean())))
with open(logfile, 'a') as f:
f.write("W : {0!s}\t".format(str([trunc(abs(w.get_value(borrow=True)).mean()) for w in weights_list])))
with open(logfile, 'a') as f:
f.write("Time : {0!s} seconds\n".format(trunc(timing)))
if (counter % state.save_frequency) == 0:
# Checking reconstruction
nums = test_X.get_value()[range(100)]
noisy_nums = f_noise(test_X.get_value()[range(100)])
reconstructed_prediction = []
reconstructed_prediction_end = []
# init reconstruction hiddens
hiddens = [T.zeros(layer_size).eval() for layer_size in layer_sizes]
for num in noisy_nums:
hiddens[0] = num
for i in range(len(hiddens)):
if len(hiddens[i].shape) == 2 and hiddens[i].shape[0] == 1:
hiddens[i] = hiddens[i][0]
_ins = hiddens + [num]
_outs = f_recon(*_ins)
hiddens = _outs[:len(hiddens)]
[reconstructed_1, reconstructed_n] = _outs[len(hiddens):]
reconstructed_prediction.append(reconstructed_1)
reconstructed_prediction_end.append(reconstructed_n)
with open(logfile, 'a') as f:
f.write("\n")
for i in range(len(nums)):
if len(reconstructed_prediction[i].shape) == 2 and reconstructed_prediction[i].shape[0] == 1:
reconstructed_prediction[i] = reconstructed_prediction[i][0]
print
nums[i].tolist(), "->", reconstructed_prediction[i].tolist()
with open(logfile, 'a') as f:
f.write("{0!s} -> {1!s}\n".format(nums[i].tolist(),
[trunc(n) if n > 0.0001 else trunc(0.00000000000000000) for n
in reconstructed_prediction[i].tolist()]))
with open(logfile, 'a') as f:
f.write("\n")
# # Concatenate stuff
# stacked = numpy.vstack([numpy.vstack([nums[i*10 : (i+1)*10], noisy_nums[i*10 : (i+1)*10], reconstructed_prediction[i*10 : (i+1)*10], reconstructed_prediction_end[i*10 : (i+1)*10]]) for i in range(10)])
# numbers_reconstruction = PIL.Image.fromarray(tile_raster_images(stacked, (root_N_input,root_N_input), (10,40)))
# numbers_reconstruction.save(outdir+'gsn_number_reconstruction_iteration_'+str(iteration)+'_epoch_'+str(counter)+'.png')
#
# #sample_numbers(counter, 'seven')
# plot_samples(counter, iteration)
#
# #save params
# save_params_to_file('gsn', counter, params, iteration)
# ANNEAL!
new_lr = learning_rate.get_value() * annealing
learning_rate.set_value(new_lr)
# 10k samples
print
'Generating 10,000 samples'
samples, _ = sample_some_numbers(N=10000)
f_samples = outdir + 'samples.npy'
numpy.save(f_samples, samples)
print
'saved digits'
#####################
# STORY 2 ALGORITHM #
#####################
for iter in range(state.max_iterations):
train_recurrent_GSN(iter, train_X, train_Y, valid_X, valid_Y, test_X, test_Y)
def train_recurrent_GSN(iteration, train_X, train_Y, valid_X, valid_Y, test_X, test_Y):
print
'----------------------------------------'
print
'TRAINING GSN FOR ITERATION', iteration
with open(logfile, 'a') as f:
f.write("--------------------------\nTRAINING GSN FOR ITERATION {0!s}\n".format(iteration))
# TRAINING
n_epoch = state.n_epoch
batch_size = state.batch_size
STOP = False
counter = 0
if iteration == 0:
learning_rate.set_value(cast32(state.learning_rate)) # learning rate
times = []
best_cost = float('inf')
patience = 0
print
'learning rate:', learning_rate.get_value()
print
'train X size:', str(train_X.shape.eval())
print
'valid X size:', str(valid_X.shape.eval())
print
'test X size:', str(test_X.shape.eval())
train_costs = []
valid_costs = []
test_costs = []
train_costs_post = []
valid_costs_post = []
test_costs_post = []
if state.vis_init:
bias_list[0].set_value(logit(numpy.clip(0.9, 0.001, train_X.get_value().mean(axis=0))))
if state.test_model:
# If testing, do not train and go directly to generating samples, parzen window estimation, and inpainting
print
'Testing : skip training'
STOP = True
while not STOP:
counter += 1
t = time.time()
print
counter, '\t',
with open(logfile, 'a') as f:
f.write("{0!s}\t".format(counter))
# shuffle the data
data.sequence_mnist_data(train_X, train_Y, valid_X, valid_Y, test_X, test_Y, dataset, rng)
# train
# init hiddens
# hiddens = [(T.zeros_like(train_X[:batch_size]).eval())]
# for i in range(len(weights_list)):
# # init with zeros
# hiddens.append(T.zeros_like(T.dot(hiddens[i], weights_list[i])).eval())
hiddens = [T.zeros((batch_size, layer_size)).eval() for layer_size in layer_sizes]
train_cost = []
train_cost_post = []
for i in range(len(train_X.get_value(borrow=True)) / batch_size):
xs = [train_X.get_value(borrow=True)[
(i * batch_size) + sequence_idx: ((i + 1) * batch_size) + sequence_idx] for sequence_idx in
range(len(Xs))]
xs, hiddens = fix_input_size(xs, hiddens)
hiddens[0] = xs[0]
_ins = hiddens + xs
_outs = f_learn(*_ins)
hiddens = _outs[:len(hiddens)]
cost = _outs[-2]
cost_post = _outs[-1]
train_cost.append(cost)
train_cost_post.append(cost_post)
train_cost = numpy.mean(train_cost)
train_costs.append(train_cost)
train_cost_post = numpy.mean(train_cost_post)
train_costs_post.append(train_cost_post)
print
'Train : ', trunc(train_cost), trunc(train_cost_post), '\t',
with open(logfile, 'a') as f:
f.write("Train : {0!s} {1!s}\t".format(trunc(train_cost), trunc(train_cost_post)))
with open(train_convergence_pre, 'a') as f:
f.write("{0!s},".format(train_cost))
with open(train_convergence_post, 'a') as f:
f.write("{0!s},".format(train_cost_post))
# valid
# init hiddens
hiddens = [T.zeros((batch_size, layer_size)).eval() for layer_size in layer_sizes]
valid_cost = []
valid_cost_post = []
for i in range(len(valid_X.get_value(borrow=True)) / batch_size):
xs = [valid_X.get_value(borrow=True)[
(i * batch_size) + sequence_idx: ((i + 1) * batch_size) + sequence_idx] for sequence_idx in
range(len(Xs))]
xs, hiddens = fix_input_size(xs, hiddens)
hiddens[0] = xs[0]
_ins = hiddens + xs
_outs = f_cost(*_ins)
hiddens = _outs[:-2]
cost = _outs[-2]
cost_post = _outs[-1]
valid_cost.append(cost)
valid_cost_post.append(cost_post)
valid_cost = numpy.mean(valid_cost)
valid_costs.append(valid_cost)
valid_cost_post = numpy.mean(valid_cost_post)
valid_costs_post.append(valid_cost_post)
print
'Valid : ', trunc(valid_cost), trunc(valid_cost_post), '\t',
with open(logfile, 'a') as f:
f.write("Valid : {0!s} {1!s}\t".format(trunc(valid_cost), trunc(valid_cost_post)))
with open(valid_convergence_pre, 'a') as f:
f.write("{0!s},".format(valid_cost))
with open(valid_convergence_post, 'a') as f:
f.write("{0!s},".format(valid_cost_post))
# test
# init hiddens
hiddens = [T.zeros((batch_size, layer_size)).eval() for layer_size in layer_sizes]
test_cost = []
test_cost_post = []
for i in range(len(test_X.get_value(borrow=True)) / batch_size):
xs = [test_X.get_value(borrow=True)[
(i * batch_size) + sequence_idx: ((i + 1) * batch_size) + sequence_idx] for sequence_idx in
range(len(Xs))]
xs, hiddens = fix_input_size(xs, hiddens)
hiddens[0] = xs[0]
_ins = hiddens + xs
_outs = f_cost(*_ins)
hiddens = _outs[:-2]
cost = _outs[-2]
cost_post = _outs[-1]
test_cost.append(cost)
test_cost_post.append(cost_post)
test_cost = numpy.mean(test_cost)
test_costs.append(test_cost)
test_cost_post = numpy.mean(test_cost_post)
test_costs_post.append(test_cost_post)
print
'Test : ', trunc(test_cost), trunc(test_cost_post), '\t',
with open(logfile, 'a') as f:
f.write("Test : {0!s} {1!s}\t".format(trunc(test_cost), trunc(test_cost_post)))
with open(test_convergence_pre, 'a') as f:
f.write("{0!s},".format(test_cost))
with open(test_convergence_post, 'a') as f:
f.write("{0!s},".format(test_cost_post))
# check for early stopping
cost = train_cost
if cost < best_cost * state.early_stop_threshold:
patience = 0
best_cost = cost
else:
patience += 1
if counter >= n_epoch or patience >= state.early_stop_length:
STOP = True
save_params_to_file('gsn', counter, params, iteration)
timing = time.time() - t
times.append(timing)
print
'time : ', trunc(timing),
print
'remaining: ', trunc((n_epoch - counter) * numpy.mean(times) / 60 / 60), 'hrs',
print
'B : ', [trunc(abs(b.get_value(borrow=True)).mean()) for b in bias_list],
print
'W : ', [trunc(abs(w.get_value(borrow=True)).mean()) for w in weights_list],
print
'V : ', [trunc(abs(v.get_value(borrow=True)).mean()) for v in recurrent_weights_list]
with open(logfile, 'a') as f:
f.write("MeanVisB : {0!s}\t".format(trunc(bias_list[0].get_value().mean())))
with open(logfile, 'a') as f:
f.write("W : {0!s}\t".format(str([trunc(abs(w.get_value(borrow=True)).mean()) for w in weights_list])))
with open(logfile, 'a') as f:
f.write("Time : {0!s} seconds\n".format(trunc(timing)))
if (counter % state.save_frequency) == 0:
# Checking reconstruction
nums = test_X.get_value()[range(100)]
noisy_nums = f_noise(test_X.get_value()[range(100)])
reconstructed_prediction = []
reconstructed_prediction_end = []
# init reconstruction hiddens
hiddens = [T.zeros(layer_size).eval() for layer_size in layer_sizes]
for num in noisy_nums:
hiddens[0] = num
for i in range(len(hiddens)):
if len(hiddens[i].shape) == 2 and hiddens[i].shape[0] == 1:
hiddens[i] = hiddens[i][0]
_ins = hiddens + [num]
_outs = f_recon(*_ins)
hiddens = _outs[:len(hiddens)]
[reconstructed_1, reconstructed_n] = _outs[len(hiddens):]
reconstructed_prediction.append(reconstructed_1)
reconstructed_prediction_end.append(reconstructed_n)
with open(logfile, 'a') as f:
f.write("\n")
for i in range(len(nums)):
if len(reconstructed_prediction[i].shape) == 2 and reconstructed_prediction[i].shape[0] == 1:
reconstructed_prediction[i] = reconstructed_prediction[i][0]
print
nums[i].tolist(), "->", reconstructed_prediction[i].tolist()
with open(logfile, 'a') as f:
f.write("{0!s} -> {1!s}\n".format(nums[i].tolist(),
[trunc(n) if n > 0.0001 else trunc(0.00000000000000000) for n
in reconstructed_prediction[i].tolist()]))
with open(logfile, 'a') as f:
f.write("\n")
# # Concatenate stuff
# stacked = numpy.vstack([numpy.vstack([nums[i*10 : (i+1)*10], noisy_nums[i*10 : (i+1)*10], reconstructed_prediction[i*10 : (i+1)*10], reconstructed_prediction_end[i*10 : (i+1)*10]]) for i in range(10)])
# numbers_reconstruction = PIL.Image.fromarray(tile_raster_images(stacked, (root_N_input,root_N_input), (10,40)))
# numbers_reconstruction.save(outdir+'gsn_number_reconstruction_iteration_'+str(iteration)+'_epoch_'+str(counter)+'.png')
#
# #sample_numbers(counter, 'seven')
# plot_samples(counter, iteration)
#
# #save params
# save_params_to_file('gsn', counter, params, iteration)
# ANNEAL!
new_lr = learning_rate.get_value() * annealing
learning_rate.set_value(new_lr)
# 10k samples
print
'Generating 10,000 samples'
samples, _ = sample_some_numbers(N=10000)
f_samples = outdir + 'samples.npy'
numpy.save(f_samples, samples)
print
'saved digits'
def experiment(state, outdir_base='./'):
rng.seed(1) # seed the numpy random generator
R.seed(1) # seed the other random generator (for reconstruction function indices)
# Initialize the output directories and files
data.mkdir_p(outdir_base)
outdir = outdir_base + "/" + state.dataset + "/"
data.mkdir_p(outdir)
logger = Logger(outdir)
train_convergence = outdir + "train_convergence.csv"
valid_convergence = outdir + "valid_convergence.csv"
test_convergence = outdir + "test_convergence.csv"
regression_train_convergence = outdir + "regression_train_convergence.csv"
regression_valid_convergence = outdir + "regression_valid_convergence.csv"
regression_test_convergence = outdir + "regression_test_convergence.csv"
init_empty_file(train_convergence)
init_empty_file(valid_convergence)
init_empty_file(test_convergence)
init_empty_file(regression_train_convergence)
init_empty_file(regression_valid_convergence)
init_empty_file(regression_test_convergence)
logger.log("----------MODEL 1, {0!s}--------------\n\n".format(state.dataset))
# load parameters from config file if this is a test
config_filename = outdir + 'config'
if state.test_model and 'config' in os.listdir(outdir):
config_vals = load_from_config(config_filename)
for CV in config_vals:
logger.log(CV)
if CV.startswith('test'):
logger.log('Do not override testing switch')
continue
try:
exec('state.' + CV) in globals(), locals()
except:
exec('state.' + CV.split('=')[0] + "='" + CV.split('=')[1] + "'") in globals(), locals()
else:
# Save the current configuration
# Useful for logs/experiments
logger.log('Saving config')
with open(config_filename, 'w') as f:
f.write(str(state))
logger.log(state)
####################################################
# Load the data, train = train+valid, and sequence #
####################################################
artificial = False # internal flag to see if the dataset is one of my artificially-sequenced MNIST varieties.
if state.dataset == 'MNIST_1' or state.dataset == 'MNIST_2' or state.dataset == 'MNIST_3' or state.dataset == 'MNIST_4':
(train_X, train_Y), (valid_X, valid_Y), (test_X, test_Y) = data.load_mnist(state.data_path)
train_X = numpy.concatenate((train_X, valid_X))
train_Y = numpy.concatenate((train_Y, valid_Y))
artificial = True
try:
dataset = int(state.dataset.split('_')[1])
except:
raise AssertionError("artificial dataset number not recognized. Input was " + state.dataset)
else:
raise AssertionError("dataset not recognized.")
# transfer the datasets into theano shared variables
train_X = theano.shared(train_X)
train_Y = theano.shared(train_Y)
valid_X = theano.shared(valid_X)
valid_Y = theano.shared(valid_Y)
test_X = theano.shared(test_X)
test_Y = theano.shared(test_Y)
if artificial: # if it my MNIST sequence, appropriately sequence it.
logger.log('Sequencing MNIST data...')
logger.log(['train set size:', len(train_Y.eval())])
logger.log(['valid set size:', len(valid_Y.eval())])
logger.log(['test set size:', len(test_Y.eval())])
data.sequence_mnist_data(train_X, train_Y, valid_X, valid_Y, test_X, test_Y, dataset, rng)
logger.log(['train set size:', len(train_Y.eval())])
logger.log(['valid set size:', len(valid_Y.eval())])
logger.log(['test set size:', len(test_Y.eval())])
logger.log('Sequencing done.\n')
# variables from the dataset that are used for initialization and image reconstruction
N_input = train_X.eval().shape[1]
root_N_input = numpy.sqrt(N_input)
# Network and training specifications
layers = state.layers # number hidden layers
walkbacks = state.walkbacks # number of walkbacks
sequence_window_size = state.sequence_window_size # number of previous hidden states to consider for the regression
layer_sizes = [N_input] + [state.hidden_size] * layers # layer sizes, from h0 to hK (h0 is the visible layer)
learning_rate = theano.shared(cast32(state.learning_rate)) # learning rate
regression_learning_rate = theano.shared(cast32(state.learning_rate)) # learning rate
annealing = cast32(state.annealing) # exponential annealing coefficient
momentum = theano.shared(cast32(state.momentum)) # momentum term
# Theano variables and RNG
X = T.fmatrix('X') # for use in sampling
Xs = [T.fmatrix(name="X_t") if i == 0 else T.fmatrix(name="X_{t-" + str(i) + "}") for i in range(
sequence_window_size + 1)] # for use in training - need one X variable for each input in the sequence history window, and what the current one should be
Xs_recon = [T.fvector(name="Xrecon_t") if i == 0 else T.fvector(name="Xrecon_{t-" + str(i) + "}") for i in range(
sequence_window_size + 1)] # for use in training - need one X variable for each input in the sequence history window, and what the current one should be
# sequence_graph_output_index = T.lscalar("i")
MRG = RNG_MRG.MRG_RandomStreams(1)
##############
# PARAMETERS #
##############
# initialize a list of weights and biases based on layer_sizes for the GSN
weights_list = [
get_shared_weights(layer_sizes[layer], layer_sizes[layer + 1], name="W_{0!s}_{1!s}".format(layer, layer + 1))
for layer in range(layers)] # initialize each layer to uniform sample from sqrt(6. / (n_in + n_out))
bias_list = [get_shared_bias(layer_sizes[layer], name='b_' + str(layer)) for layer in
range(layers + 1)] # initialize each layer to 0's.
# parameters for the regression - only need them for the odd layers in the network!
regression_weights_list = [
[get_shared_regression_weights(state.hidden_size, name="V_{t-" + str(window + 1) + "}_layer" + str(layer)) for
layer in range(layers + 1) if (layer % 2) != 0] for window in
range(sequence_window_size)] # initialize to identity matrix the size of hidden layer.
regression_bias_list = [get_shared_bias(state.hidden_size, name='vb_' + str(layer)) for layer in range(layers + 1)
if (layer % 2) != 0] # initialize to 0's.
# need initial biases (tau) as well for when there aren't sequence_window_size hiddens in the history.
tau_list = [
[get_shared_bias(state.hidden_size, name='tau_{t-' + str(window + 1) + "}_layer" + str(layer)) for layer in
range(layers + 1) if (layer % 2) != 0] for window in range(sequence_window_size)]
###########################################################
# load initial parameters of gsn to speed up my debugging #
###########################################################
params_to_load = 'gsn_params.pkl'
initialized_gsn = False
if os.path.isfile(params_to_load):
logger.log("\nLoading existing GSN parameters")
loaded_params = cPickle.load(open(params_to_load, 'r'))
[p.set_value(lp.get_value(borrow=False)) for lp, p in zip(loaded_params[:len(weights_list)], weights_list)]
[p.set_value(lp.get_value(borrow=False)) for lp, p in zip(loaded_params[len(weights_list):], bias_list)]
initialized_gsn = True
########################
# ACTIVATION FUNCTIONS #
########################
if state.hidden_act == 'sigmoid':
logger.log('Using sigmoid activation for hiddens')
hidden_activation = T.nnet.sigmoid
elif state.hidden_act == 'rectifier':
logger.log('Using rectifier activation for hiddens')
hidden_activation = lambda x: T.maximum(cast32(0), x)
elif state.hidden_act == 'tanh':
logger.log('Using hyperbolic tangent activation for hiddens')
hidden_activation = lambda x: T.tanh(x)
else:
logger.log("Did not recognize hidden activation {0!s}, please use tanh, rectifier, or sigmoid".format(
state.hidden_act))
raise AssertionError("Did not recognize hidden activation {0!s}, please use tanh, rectifier, or sigmoid".format(
state.hidden_act))
if state.visible_act == 'sigmoid':
logger.log('Using sigmoid activation for visible layer')
visible_activation = T.nnet.sigmoid
elif state.visible_act == 'softmax':
logger.log('Using softmax activation for visible layer')
visible_activation = T.nnet.softmax
else:
logger.log(
"Did not recognize visible activation {0!s}, please use sigmoid or softmax".format(state.visible_act))
raise AssertionError(
"Did not recognize visible activation {0!s}, please use sigmoid or softmax".format(state.visible_act))
###############################################
# COMPUTATIONAL GRAPH HELPER METHODS FOR TGSN #
###############################################
def update_layers(hiddens, p_X_chain, noisy=True):
logger.log('odd layer updates')
update_odd_layers(hiddens, noisy)
logger.log('even layer updates')
update_even_layers(hiddens, p_X_chain, noisy)
logger.log('done full update.\n')
def update_layers_reverse(hiddens, p_X_chain, noisy=True):
logger.log('even layer updates')
update_even_layers(hiddens, p_X_chain, noisy)
logger.log('odd layer updates')
update_odd_layers(hiddens, noisy)
logger.log('done full update.\n')
# Odd layer update function
# just a loop over the odd layers
def update_odd_layers(hiddens, noisy):
for i in range(1, len(hiddens), 2):
logger.log(['updating layer', i])
simple_update_layer(hiddens, None, i, add_noise=noisy)
# Even layer update
# p_X_chain is given to append the p(X|...) at each full update (one update = odd update + even update)
def update_even_layers(hiddens, p_X_chain, noisy):
for i in range(0, len(hiddens), 2):
logger.log(['updating layer', i])
simple_update_layer(hiddens, p_X_chain, i, add_noise=noisy)
# The layer update function
# hiddens : list containing the symbolic theano variables [visible, hidden1, hidden2, ...]
# layer_update will modify this list inplace
# p_X_chain : list containing the successive p(X|...) at each update
# update_layer will append to this list
# i : the current layer being updated
# add_noise : pre (and post) activation gaussian noise flag
def simple_update_layer(hiddens, p_X_chain, i, add_noise=True):
# Compute the dot product, whatever layer
# If the visible layer X
if i == 0:
logger.log('using ' + str(weights_list[i]) + '.T')
hiddens[i] = T.dot(hiddens[i + 1], weights_list[i].T) + bias_list[i]
# If the top layer
elif i == len(hiddens) - 1:
logger.log(['using', weights_list[i - 1]])
hiddens[i] = T.dot(hiddens[i - 1], weights_list[i - 1]) + bias_list[i]
# Otherwise in-between layers
else:
logger.log(["using {0!s} and {1!s}.T".format(weights_list[i - 1], weights_list[i])])
# next layer : hiddens[i+1], assigned weights : W_i
# previous layer : hiddens[i-1], assigned weights : W_(i-1)
hiddens[i] = T.dot(hiddens[i + 1], weights_list[i].T) + T.dot(hiddens[i - 1], weights_list[i - 1]) + \
bias_list[i]
# Add pre-activation noise if NOT input layer
if i == 1 and state.noiseless_h1:
logger.log('>>NO noise in first hidden layer')
add_noise = False
# pre activation noise
if i != 0 and add_noise:
logger.log(['Adding pre-activation gaussian noise for layer', i])
hiddens[i] = add_gaussian_noise(hiddens[i], state.hidden_add_noise_sigma)
# ACTIVATION!
if i == 0:
logger.log('{} activation for visible layer'.format(state.visible_act))
hiddens[i] = visible_activation(hiddens[i])
else:
logger.log(['Hidden units {} activation for layer'.format(state.hidden_act), i])
hiddens[i] = hidden_activation(hiddens[i])
# post activation noise
# why is there post activation noise? Because there is already pre-activation noise, this just doubles the amount of noise between each activation of the hiddens.
# if i != 0 and add_noise:
# logger.log(['Adding post-activation gaussian noise for layer', i])
# hiddens[i] = add_gaussian(hiddens[i], state.hidden_add_noise_sigma)
# build the reconstruction chain if updating the visible layer X
if i == 0:
# if input layer -> append p(X|...)
p_X_chain.append(hiddens[i])
# sample from p(X|...) - SAMPLING NEEDS TO BE CORRECT FOR INPUT TYPES I.E. FOR BINARY MNIST SAMPLING IS BINOMIAL. real-valued inputs should be gaussian
if state.input_sampling:
logger.log('Sampling from input')
sampled = MRG.binomial(p=hiddens[i], size=hiddens[i].shape, dtype='float32')
else:
logger.log('>>NO input sampling')
sampled = hiddens[i]
# add noise
sampled = salt_and_pepper(sampled, state.input_salt_and_pepper)
# set input layer
hiddens[i] = sampled
def perform_regression_step(hiddens, sequence_history):
logger.log(["Sequence history length:", len(sequence_history)])
# only need to work over the odd layers of the hiddens
odd_layers = [i for i in range(len(hiddens)) if (i % 2) != 0]
# depending on the size of the sequence history, it could be 0, 1, 2, 3, ... sequence_window_size
for (hidden_index, regression_index) in zip(odd_layers, range(len(odd_layers))):
terms_used = []
sequence_terms = []
for history_index in range(sequence_window_size):
if history_index < len(sequence_history):
# dot product with history term
sequence_terms.append(T.dot(sequence_history[history_index][regression_index],
regression_weights_list[history_index][regression_index]))
terms_used.append(regression_weights_list[history_index][regression_index])
else:
# otherwise, no history for necessary spot, so use the tau
sequence_terms.append(tau_list[history_index][regression_index])
terms_used.append(tau_list[history_index][regression_index])
if len(sequence_terms) > 0:
sequence_terms.append(regression_bias_list[regression_index])
terms_used.append(regression_bias_list[regression_index])
logger.log(["REGRESSION for hidden layer {0!s} using:".format(hidden_index), terms_used])
hiddens[hidden_index] = numpy.sum(sequence_terms)
def build_gsn_graph(x, noiseflag):
p_X_chain = []
if noiseflag:
X_init = salt_and_pepper(x, state.input_salt_and_pepper)
else:
X_init = x
# init hiddens with zeros
hiddens = [X_init]
for w in weights_list:
hiddens.append(T.zeros_like(T.dot(hiddens[-1], w)))
# The layer update scheme
logger.log(["Building the gsn graph :", walkbacks, "updates"])
for i in range(walkbacks):
logger.log("GSN Walkback {!s}/{!s}".format(i + 1, walkbacks))
update_layers(hiddens, p_X_chain, noisy=noiseflag)
return p_X_chain
def build_sequence_graph(xs, noiseflag):
predicted_X_chains = []
p_X_chains = []
sequence_history = []
# The layer update scheme
logger.log(["Building the regression graph :", len(Xs), "updates"])
for x_index in range(len(xs)):
x = xs[x_index]
# Predict what the current X should be
''' hidden layer init '''
pred_hiddens = [T.zeros_like(x)]
for w in weights_list:
# init with zeros
pred_hiddens.append(T.zeros_like(T.dot(pred_hiddens[-1], w)))
logger.log("Performing regression step!")
perform_regression_step(pred_hiddens, sequence_history) # do the regression!
logger.log("\n")
predicted_X_chain = []
for i in range(walkbacks):
logger.log("Prediction Walkback {!s}/{!s}".format(i + 1, walkbacks))
update_layers_reverse(pred_hiddens, predicted_X_chain,
noisy=False) # no noise in the prediction because x_prediction can't be recovered from x anyway
predicted_X_chains.append(predicted_X_chain)
# Now do the actual GSN step and add it to the sequence history
# corrupt x if noisy
if noiseflag:
X_init = salt_and_pepper(x, state.input_salt_and_pepper)
else:
X_init = x
''' hidden layer init '''
hiddens = [T.zeros_like(x)]
for w in weights_list:
# init with zeros
hiddens.append(T.zeros_like(T.dot(hiddens[-1], w)))
# # substitute some of the zero layers for what was predicted - need to advance the prediction by 1 layer so it is the evens
# update_even_layers(pred_hiddens,[],noisy=False)
# for i in [layer for layer in range(len(hiddens)) if (layer%2 == 0)]:
# hiddens[i] = pred_hiddens[i]
hiddens[0] = X_init
chain = []
for i in range(walkbacks):
logger.log("GSN walkback {!s}/{!s}".format(i + 1, walkbacks))
update_layers(hiddens, chain, noisy=noiseflag)
# Append the p_X_chain
p_X_chains.append(chain)
# Append the odd layers of the hiddens to the sequence history
sequence_history.append([hiddens[layer] for layer in range(len(hiddens)) if (layer % 2) != 0])
# select the prediction and reconstruction from the lists
# prediction_chain = T.stacklists(predicted_X_chains)[sequence_graph_output_index]
# reconstruction_chain = T.stacklists(p_X_chains)[sequence_graph_output_index]
return predicted_X_chains, p_X_chains
##############################################
# Build the training graph for the GSN #
##############################################
logger.log("\nBuilding GSN graphs")
p_X_chain_init = build_gsn_graph(X, noiseflag=True)
predicted_X_chain_gsns, p_X_chains = build_sequence_graph(Xs, noiseflag=True)
predicted_X_chain_gsn = predicted_X_chain_gsns[-1]
p_X_chain = p_X_chains[-1]
###############################################
# Build the training graph for the regression #
###############################################
logger.log("\nBuilding regression graph")
# no noise! noise is only used as regularization for GSN stage
predicted_X_chains_regression, _ = build_sequence_graph(Xs, noiseflag=False)
predicted_X_chain = predicted_X_chains_regression[-1]
######################
# COST AND GRADIENTS #
######################
if state.cost_funct == 'binary_crossentropy':
logger.log('\nUsing binary cross-entropy cost!')
cost_function = lambda x, y: T.mean(T.nnet.binary_crossentropy(x, y))
elif state.cost_funct == 'square':
logger.log("\nUsing square error cost!")
# cost_function = lambda x,y: T.log(T.mean(T.sqr(x-y)))
cost_function = lambda x, y: T.log(T.sum(T.pow((x - y), 2)))
else:
raise AssertionError(
"Did not recognize cost function {0!s}, please use binary_crossentropy or square".format(state.cost_funct))
logger.log('Cost w.r.t p(X|...) at every step in the graph for the TGSN')
gsn_costs_init = [cost_function(rX, X) for rX in p_X_chain_init]
show_gsn_cost_init = gsn_costs_init[-1]
gsn_cost_init = numpy.sum(gsn_costs_init)
gsn_init_mse = T.mean(T.sqr(p_X_chain_init[-1] - X), axis=0)
gsn_init_error = T.mean(gsn_init_mse)
# gsn_costs = T.mean(T.mean(T.nnet.binary_crossentropy(p_X_chain, T.stacklists(Xs)[sequence_graph_output_index]),2),1)
gsn_costs = [cost_function(rX, Xs[-1]) for rX in predicted_X_chain_gsn]
show_gsn_cost = gsn_costs[-1]
gsn_cost = T.sum(gsn_costs)
gsn_mse = T.mean(T.sqr(predicted_X_chain_gsn[-1] - Xs[-1]), axis=0)
gsn_error = T.mean(gsn_mse)
gsn_params = weights_list + bias_list
logger.log(["gsn params:", gsn_params])
# l2 regularization
# regression_regularization_cost = T.sum([T.sum(recurrent_weights ** 2) for recurrent_weights in regression_weights_list])
regression_regularization_cost = 0
regression_costs = [cost_function(rX, Xs[-1]) for rX in predicted_X_chain]
show_regression_cost = regression_costs[-1]
regression_cost = T.sum(regression_costs) + state.regularize_weight * regression_regularization_cost
regression_mse = T.mean(T.sqr(predicted_X_chain[-1] - Xs[-1]), axis=0)
regression_error = T.mean(regression_mse)
# only using the odd layers update -> even-indexed parameters in the list because it starts at v1
# need to flatten the regression list -> couldn't immediately find the python method so here is the implementation
regression_weights_flattened = []
for weights in regression_weights_list:
regression_weights_flattened.extend(weights)
tau_flattened = []
for tau in tau_list:
tau_flattened.extend(tau)
regression_params = regression_weights_flattened + regression_bias_list # + tau_flattened
logger.log(["regression params:", regression_params])
logger.log("creating functions...")
t = time.time()
gradient_init = T.grad(gsn_cost_init, gsn_params)
gradient_buffer_init = [theano.shared(numpy.zeros(param.get_value().shape, dtype='float32')) for param in
gsn_params]
m_gradient_init = [momentum * gb + (cast32(1) - momentum) * g for (gb, g) in
zip(gradient_buffer_init, gradient_init)]
param_updates_init = [(param, param - learning_rate * mg) for (param, mg) in zip(gsn_params, m_gradient_init)]
gradient_buffer_updates_init = zip(gradient_buffer_init, m_gradient_init)
updates_init = OrderedDict(param_updates_init + gradient_buffer_updates_init)
gsn_f_learn_init = theano.function(inputs=[X],
updates=updates_init,
outputs=[show_gsn_cost_init, gsn_init_error])
gsn_f_cost_init = theano.function(inputs=[X],
outputs=[show_gsn_cost_init, gsn_init_error])
gradient = T.grad(gsn_cost, gsn_params)
gradient_buffer = [theano.shared(numpy.zeros(param.get_value().shape, dtype='float32')) for param in gsn_params]
m_gradient = [momentum * gb + (cast32(1) - momentum) * g for (gb, g) in zip(gradient_buffer, gradient)]
param_updates = [(param, param - learning_rate * mg) for (param, mg) in zip(gsn_params, m_gradient)]
gradient_buffer_updates = zip(gradient_buffer, m_gradient)
updates = OrderedDict(param_updates + gradient_buffer_updates)
gsn_f_cost = theano.function(inputs=Xs,
outputs=[show_gsn_cost, gsn_error])
gsn_f_learn = theano.function(inputs=Xs,
updates=updates,
outputs=[show_gsn_cost, gsn_error])
regression_gradient = T.grad(regression_cost, regression_params)
regression_gradient_buffer = [theano.shared(numpy.zeros(rparam.get_value().shape, dtype='float32')) for rparam in
regression_params]
regression_m_gradient = [momentum * rgb + (cast32(1) - momentum) * rg for (rgb, rg) in
zip(regression_gradient_buffer, regression_gradient)]
regression_param_updates = [(rparam, rparam - regression_learning_rate * rmg) for (rparam, rmg) in
zip(regression_params, regression_m_gradient)]
regression_gradient_buffer_updates = zip(regression_gradient_buffer, regression_m_gradient)
regression_updates = OrderedDict(regression_param_updates + regression_gradient_buffer_updates)
regression_f_cost = theano.function(inputs=Xs,
outputs=[show_regression_cost, regression_error])
regression_f_learn = theano.function(inputs=Xs,
updates=regression_updates,
outputs=[show_regression_cost, regression_error])
logger.log("functions done. took " + make_time_units_string(time.time() - t) + ".\n")
############################################################################################
# Denoise some numbers : show number, noisy number, predicted number, reconstructed number #
############################################################################################
# Recompile the graph without noise for reconstruction function
# The layer update scheme
logger.log("Creating graph for noisy reconstruction function at checkpoints during training.")
predicted_X_chains_R, p_X_chains_R = build_sequence_graph(Xs_recon, noiseflag=False)
predicted_X_chain_R = predicted_X_chains_R[-1]
p_X_chain_R = p_X_chains_R[-1]
f_recon = theano.function(inputs=Xs_recon, outputs=[predicted_X_chain_R[-1], p_X_chain_R[-1]])
# Now do the same but for the GSN in the initial run
p_X_chain_R = build_gsn_graph(X, noiseflag=False)
f_recon_init = theano.function(inputs=[X], outputs=p_X_chain_R[-1])
############
# Sampling #
############
f_noise = theano.function(inputs=[X], outputs=salt_and_pepper(X, state.input_salt_and_pepper))
# the input to the sampling function
network_state_input = [X] + [T.fmatrix() for i in range(layers)]
# "Output" state of the network (noisy)
# initialized with input, then we apply updates
# network_state_output = network_state_input
network_state_output = [X] + network_state_input[1:]
visible_pX_chain = []
# ONE update
logger.log("Performing one walkback in network state sampling.")
update_layers(network_state_output, visible_pX_chain, noisy=True)
if layers == 1:
f_sample_simple = theano.function(inputs=[X], outputs=visible_pX_chain[-1])
# WHY IS THERE A WARNING????
# because the first odd layers are not used -> directly computed FROM THE EVEN layers
# unused input = warn
f_sample2 = theano.function(inputs=network_state_input, outputs=network_state_output + visible_pX_chain,
on_unused_input='warn')
def sample_some_numbers_single_layer():
x0 = test_X.get_value()[7:8]
samples = [x0]
x = f_noise(x0)
for i in range(399):
x = f_sample_simple(x)
samples.append(x)
x = numpy.random.binomial(n=1, p=x, size=x.shape).astype('float32')
x = f_noise(x)
return numpy.vstack(samples)
def sampling_wrapper(NSI):
# * is the "splat" operator: It takes a list as input, and expands it into actual positional arguments in the function call.
out = f_sample2(*NSI)
NSO = out[:len(network_state_output)]
vis_pX_chain = out[len(network_state_output):]
return NSO, vis_pX_chain
def sample_some_numbers(N=400):
# The network's initial state
init_vis = test_X.get_value()[7:8]
noisy_init_vis = f_noise(init_vis)
network_state = [
[noisy_init_vis] + [numpy.zeros((1, len(b.get_value())), dtype='float32') for b in bias_list[1:]]]
visible_chain = [init_vis]
noisy_h0_chain = [noisy_init_vis]
for i in range(N - 1):
# feed the last state into the network, compute new state, and obtain visible units expectation chain
net_state_out, vis_pX_chain = sampling_wrapper(network_state[-1])
# append to the visible chain
visible_chain += vis_pX_chain
# append state output to the network state chain
network_state.append(net_state_out)
noisy_h0_chain.append(net_state_out[0])
return numpy.vstack(visible_chain), numpy.vstack(noisy_h0_chain)
def plot_samples(epoch_number, iteration):
to_sample = time.time()
if layers == 1:
# one layer model
V = sample_some_numbers_single_layer()
else:
V, _ = sample_some_numbers()
img_samples = PIL.Image.fromarray(tile_raster_images(V, (root_N_input, root_N_input), (20, 20)))
fname = outdir + 'samples_iteration_' + str(iteration) + '_epoch_' + str(epoch_number) + '.png'
img_samples.save(fname)
logger.log('Took ' + str(time.time() - to_sample) + ' to sample 400 numbers')
#############################
# Save the model parameters #
#############################
def save_params_to_file(name, n, gsn_params, iteration):
pass
logger.log('saving parameters...')
save_path = outdir + name + '_params_iteration_' + str(iteration) + '_epoch_' + str(n) + '.pkl'
f = open(save_path, 'wb')
try:
cPickle.dump(gsn_params, f, protocol=cPickle.HIGHEST_PROTOCOL)
finally:
f.close()
def save_params(params):
values = [param.get_value(borrow=True) for param in params]
return values
def restore_params(params, values):
for i in range(len(params)):
params[i].set_value(values[i])
################
# GSN TRAINING #
################
def train_GSN(iteration, train_X, train_Y, valid_X, valid_Y, test_X, test_Y):
logger.log('----------------TRAINING GSN FOR ITERATION ' + str(iteration) + "--------------\n")
# TRAINING
n_epoch = state.n_epoch
batch_size = state.batch_size
STOP = False
counter = 0
if iteration == 0:
learning_rate.set_value(cast32(state.learning_rate)) # learning rate
times = []
best_cost = float('inf')
best_params = None
patience = 0
logger.log(['learning rate:', learning_rate.get_value()])
logger.log(['train X size:', str(train_X.shape.eval())])
logger.log(['valid X size:', str(valid_X.shape.eval())])
logger.log(['test X size:', str(test_X.shape.eval())])
if state.vis_init:
bias_list[0].set_value(logit(numpy.clip(0.9, 0.001, train_X.get_value().mean(axis=0))))
if state.test_model:
# If testing, do not train and go directly to generating samples, parzen window estimation, and inpainting
logger.log('Testing : skip training')
STOP = True
while not STOP:
counter += 1
t = time.time()
logger.append([counter, '\t'])
# shuffle the data
# data.sequence_mnist_data(train_X, train_Y, valid_X, valid_Y, test_X, test_Y, dataset, rng)
# train
train_costs = []
train_errors = []
if iteration == 0:
for i in range(len(train_X.get_value(borrow=True)) / batch_size):
x = train_X.get_value(borrow=True)[i * batch_size: (i + 1) * batch_size]
cost, error = gsn_f_learn_init(x)
train_costs.append([cost])
train_errors.append([error])
else:
for i in range(len(train_X.get_value(borrow=True)) / batch_size):
xs = [train_X.get_value(borrow=True)[
(i * batch_size) + sequence_idx: ((i + 1) * batch_size) + sequence_idx] for sequence_idx in
range(len(Xs))]
xs, _ = fix_input_size(xs)
_ins = xs # + [sequence_window_size]
cost, error = gsn_f_learn(*_ins)
train_costs.append(cost)
train_errors.append(error)
train_costs = numpy.mean(train_costs)
train_errors = numpy.mean(train_errors)
logger.append(['Train: ', trunc(train_costs), trunc(train_errors), '\t'])
with open(train_convergence, 'a') as f:
f.write("{0!s},".format(train_costs))
f.write("\n")
# valid
valid_costs = []
if iteration == 0:
for i in range(len(valid_X.get_value(borrow=True)) / batch_size):
x = valid_X.get_value(borrow=True)[i * batch_size: (i + 1) * batch_size]
cost, _ = gsn_f_cost_init(x)
valid_costs.append([cost])
else:
for i in range(len(valid_X.get_value(borrow=True)) / batch_size):
xs = [valid_X.get_value(borrow=True)[
(i * batch_size) + sequence_idx: ((i + 1) * batch_size) + sequence_idx] for sequence_idx in
range(len(Xs))]
xs, _ = fix_input_size(xs)
_ins = xs # + [sequence_window_size]
costs, _ = gsn_f_cost(*_ins)
valid_costs.append(costs)
valid_costs = numpy.mean(valid_costs)
logger.append(['Valid: ', trunc(valid_costs), '\t'])
with open(valid_convergence, 'a') as f:
f.write("{0!s},".format(valid_costs))
f.write("\n")
# test
test_costs = []
test_errors = []
if iteration == 0:
for i in range(len(test_X.get_value(borrow=True)) / batch_size):
x = test_X.get_value(borrow=True)[i * batch_size: (i + 1) * batch_size]
cost, error = gsn_f_cost_init(x)
test_costs.append([cost])
test_errors.append([error])
else:
for i in range(len(test_X.get_value(borrow=True)) / batch_size):
xs = [test_X.get_value(borrow=True)[
(i * batch_size) + sequence_idx: ((i + 1) * batch_size) + sequence_idx] for sequence_idx in
range(len(Xs))]
xs, _ = fix_input_size(xs)
_ins = xs # + [sequence_window_size]
costs, errors = gsn_f_cost(*_ins)
test_costs.append(costs)
test_errors.append(errors)
test_costs = numpy.mean(test_costs)
test_errors = numpy.mean(test_errors)
logger.append(['Test: ', trunc(test_costs), trunc(test_errors), '\t'])
with open(test_convergence, 'a') as f:
f.write("{0!s},".format(test_costs))
f.write("\n")
# check for early stopping
cost = numpy.sum(valid_costs)
if cost < best_cost * state.early_stop_threshold:
patience = 0
best_cost = cost
# save the parameters that made it the best
best_params = save_params(gsn_params)
else:
patience += 1
if counter >= n_epoch or patience >= state.early_stop_length:
STOP = True
if best_params is not None:
restore_params(gsn_params, best_params)
save_params_to_file('gsn', counter, gsn_params, iteration)
logger.log(["next learning rate should be", learning_rate.get_value() * annealing])
timing = time.time() - t
times.append(timing)
logger.append('time: ' + make_time_units_string(timing))
logger.log('remaining: ' + make_time_units_string((n_epoch - counter) * numpy.mean(times)))
if (counter % state.save_frequency) == 0 or STOP is True:
n_examples = 100
if iteration == 0:
random_idx = numpy.array(R.sample(range(len(test_X.get_value())), n_examples))
numbers = test_X.get_value()[random_idx]
noisy_numbers = f_noise(test_X.get_value()[random_idx])
reconstructed = f_recon_init(noisy_numbers)
# Concatenate stuff
stacked = numpy.vstack([numpy.vstack(
[numbers[i * 10: (i + 1) * 10], noisy_numbers[i * 10: (i + 1) * 10],
reconstructed[i * 10: (i + 1) * 10]]) for i in range(10)])
number_reconstruction = PIL.Image.fromarray(
tile_raster_images(stacked, (root_N_input, root_N_input), (10, 30)))
else:
n_examples = n_examples + sequence_window_size
# Checking reconstruction
# grab 100 numbers in the sequence from the test set
nums = test_X.get_value()[range(n_examples)]
noisy_nums = f_noise(test_X.get_value()[range(n_examples)])
reconstructed_prediction = []
reconstructed = []
for i in range(n_examples):
if i >= sequence_window_size:
xs = [noisy_nums[i - x] for x in range(len(Xs))]
xs.reverse()
_ins = xs # + [sequence_window_size]
_outs = f_recon(*_ins)
prediction = _outs[0]
reconstruction = _outs[1]
reconstructed_prediction.append(prediction)
reconstructed.append(reconstruction)
nums = nums[sequence_window_size:]
noisy_nums = noisy_nums[sequence_window_size:]
reconstructed_prediction = numpy.array(reconstructed_prediction)
reconstructed = numpy.array(reconstructed)
# Concatenate stuff
stacked = numpy.vstack([numpy.vstack([nums[i * 10: (i + 1) * 10], noisy_nums[i * 10: (i + 1) * 10],
reconstructed_prediction[i * 10: (i + 1) * 10],
reconstructed[i * 10: (i + 1) * 10]]) for i in range(10)])
number_reconstruction = PIL.Image.fromarray(
tile_raster_images(stacked, (root_N_input, root_N_input), (10, 40)))
# epoch_number = reduce(lambda x,y : x + y, ['_'] * (4-len(str(counter)))) + str(counter)
number_reconstruction.save(
outdir + 'gsn_number_reconstruction_iteration_' + str(iteration) + '_epoch_' + str(
counter) + '.png')
# sample_numbers(counter, 'seven')
plot_samples(counter, iteration)
# save gsn_params
save_params_to_file('gsn', counter, gsn_params, iteration)
# ANNEAL!
new_lr = learning_rate.get_value() * annealing
learning_rate.set_value(new_lr)
# 10k samples
logger.log('Generating 10,000 samples')
samples, _ = sample_some_numbers(N=10000)
f_samples = outdir + 'samples.npy'
numpy.save(f_samples, samples)
logger.log('saved digits')
#######################
# REGRESSION TRAINING #
#######################
def train_regression(iteration, train_X, train_Y, valid_X, valid_Y, test_X, test_Y):
logger.log('-------------TRAINING REGRESSION FOR ITERATION {0!s}-------------'.format(iteration))
# TRAINING
n_epoch = state.n_epoch
batch_size = state.batch_size
STOP = False
counter = 0
best_cost = float('inf')
best_params = None
patience = 0
if iteration == 0:
regression_learning_rate.set_value(cast32(state.learning_rate)) # learning rate
times = []
logger.log(['learning rate:', regression_learning_rate.get_value()])
logger.log(['train X size:', str(train_X.shape.eval())])
logger.log(['valid X size:', str(valid_X.shape.eval())])
logger.log(['test X size:', str(test_X.shape.eval())])
if state.test_model:
# If testing, do not train and go directly to generating samples, parzen window estimation, and inpainting
logger.log('Testing : skip training')
STOP = True
while not STOP:
counter += 1
t = time.time()
logger.append([counter, '\t'])
# shuffle the data
# data.sequence_mnist_data(train_X, train_Y, valid_X, valid_Y, test_X, test_Y, dataset, rng)
# train
train_costs = []
train_errors = []
for i in range(len(train_X.get_value(borrow=True)) / batch_size):
xs = [train_X.get_value(borrow=True)[
(i * batch_size) + sequence_idx: ((i + 1) * batch_size) + sequence_idx] for sequence_idx in
range(len(Xs))]
xs, _ = fix_input_size(xs)
_ins = xs # + [sequence_window_size]
cost, error = regression_f_learn(*_ins)
# print trunc(cost)
# print [numpy.asarray(a) for a in f_check(*_ins)]
train_costs.append(cost)
train_errors.append(error)
train_costs = numpy.mean(train_costs)
train_errors = numpy.mean(train_errors)
logger.append(['rTrain: ', trunc(train_costs), trunc(train_errors), '\t'])
with open(regression_train_convergence, 'a') as f:
f.write("{0!s},".format(train_costs))
f.write("\n")
# valid
valid_costs = []
for i in range(len(valid_X.get_value(borrow=True)) / batch_size):
xs = [valid_X.get_value(borrow=True)[
(i * batch_size) + sequence_idx: ((i + 1) * batch_size) + sequence_idx] for sequence_idx in
range(len(Xs))]
xs, _ = fix_input_size(xs)
_ins = xs # + [sequence_window_size]
cost, _ = regression_f_cost(*_ins)
valid_costs.append(cost)
valid_costs = numpy.mean(valid_costs)
logger.append(['rValid: ', trunc(valid_costs), '\t'])
with open(regression_valid_convergence, 'a') as f:
f.write("{0!s},".format(valid_costs))
f.write("\n")
# test
test_costs = []
test_errors = []
for i in range(len(test_X.get_value(borrow=True)) / batch_size):
xs = [test_X.get_value(borrow=True)[
(i * batch_size) + sequence_idx: ((i + 1) * batch_size) + sequence_idx] for sequence_idx in
range(len(Xs))]
xs, _ = fix_input_size(xs)
_ins = xs # + [sequence_window_size]
cost, error = regression_f_cost(*_ins)
test_costs.append(cost)
test_errors.append(error)
test_costs = numpy.mean(test_costs)
test_errors = numpy.mean(test_errors)
logger.append(['rTest: ', trunc(test_costs), trunc(test_errors), '\t'])
with open(regression_test_convergence, 'a') as f:
f.write("{0!s},".format(test_costs))
f.write("\n")
# check for early stopping
cost = numpy.sum(valid_costs)
if cost < best_cost * state.early_stop_threshold:
patience = 0
best_cost = cost
# keep the best params so far
best_params = save_params(regression_params)
else:
patience += 1
if counter >= n_epoch or patience >= state.early_stop_length:
STOP = True
if best_params is not None:
restore_params(regression_params, best_params)
save_params_to_file('regression', counter, regression_params, iteration)
logger.log(["next learning rate should be", regression_learning_rate.get_value() * annealing])
timing = time.time() - t
times.append(timing)
logger.append('time: ' + make_time_units_string(timing))
logger.log('remaining: ' + make_time_units_string((n_epoch - counter) * numpy.mean(times)))
if (counter % state.save_frequency) == 0 or STOP is True:
n_examples = 100 + sequence_window_size
# Checking reconstruction
# grab 100 numbers in the sequence from the test set
nums = test_X.get_value()[range(n_examples)]
noisy_nums = f_noise(test_X.get_value()[range(n_examples)])
reconstructed_prediction = []
reconstructed = []
for i in range(n_examples):
if i >= sequence_window_size:
xs = [noisy_nums[i - x] for x in range(len(Xs))]
xs.reverse()
_ins = xs # + [sequence_window_size]
_outs = f_recon(*_ins)
prediction = _outs[0]
reconstruction = _outs[1]
reconstructed_prediction.append(prediction)
reconstructed.append(reconstruction)
nums = nums[sequence_window_size:]
noisy_nums = noisy_nums[sequence_window_size:]
reconstructed_prediction = numpy.array(reconstructed_prediction)
reconstructed = numpy.array(reconstructed)
# Concatenate stuff
stacked = numpy.vstack([numpy.vstack([nums[i * 10: (i + 1) * 10], noisy_nums[i * 10: (i + 1) * 10],
reconstructed_prediction[i * 10: (i + 1) * 10],
reconstructed[i * 10: (i + 1) * 10]]) for i in range(10)])
number_reconstruction = PIL.Image.fromarray(
tile_raster_images(stacked, (root_N_input, root_N_input), (10, 40)))
# epoch_number = reduce(lambda x,y : x + y, ['_'] * (4-len(str(counter)))) + str(counter)
number_reconstruction.save(
outdir + 'regression_number_reconstruction_iteration_' + str(iteration) + '_epoch_' + str(
counter) + '.png')
# save gsn_params
save_params_to_file('regression', counter, regression_params, iteration)
# ANNEAL!
new_r_lr = regression_learning_rate.get_value() * annealing
regression_learning_rate.set_value(new_r_lr)
#####################
# STORY 1 ALGORITHM #
#####################
# alternate training the gsn and training the regression
for iteration in range(state.max_iterations):
# if iteration is 0 and initialized_gsn is False:
# train_regression(iteration, train_X, train_Y, valid_X, valid_Y, test_X, test_Y)
# else:
# train_GSN(iteration, train_X, train_Y, valid_X, valid_Y, test_X, test_Y)
# train_regression(iteration, train_X, train_Y, valid_X, valid_Y, test_X, test_Y)
train_GSN(iteration, train_X, train_Y, valid_X, valid_Y, test_X, test_Y)
train_regression(iteration, train_X, train_Y, valid_X, valid_Y, test_X, test_Y)
def train_recurrent_GSN(iteration, train_X, train_Y, valid_X, valid_Y,
test_X, test_Y):
print '----------------------------------------'
print 'TRAINING GSN FOR ITERATION', iteration
with open(logfile, 'a') as f:
f.write(
"--------------------------\nTRAINING GSN FOR ITERATION {0!s}\n"
.format(iteration))
# TRAINING
n_epoch = state.n_epoch
batch_size = state.batch_size
STOP = False
counter = 0
if iteration == 0:
learning_rate.set_value(cast32(
state.learning_rate)) # learning rate
times = []
best_cost = float('inf')
patience = 0
print 'learning rate:', learning_rate.get_value()
print 'train X size:', str(train_X.shape.eval())
print 'valid X size:', str(valid_X.shape.eval())
print 'test X size:', str(test_X.shape.eval())
train_costs = []
valid_costs = []
test_costs = []
train_costs_post = []
valid_costs_post = []
test_costs_post = []
if state.vis_init:
bias_list[0].set_value(
logit(numpy.clip(0.9, 0.001,
train_X.get_value().mean(axis=0))))
if state.test_model:
# If testing, do not train and go directly to generating samples, parzen window estimation, and inpainting
print 'Testing : skip training'
STOP = True
while not STOP:
counter += 1
t = time.time()
print counter, '\t',
with open(logfile, 'a') as f:
f.write("{0!s}\t".format(counter))
#shuffle the data
data.sequence_mnist_data(train_X, train_Y, valid_X, valid_Y,
test_X, test_Y, dataset, rng)
#train
#init hiddens
# hiddens = [(T.zeros_like(train_X[:batch_size]).eval())]
# for i in range(len(weights_list)):
# # init with zeros
# hiddens.append(T.zeros_like(T.dot(hiddens[i], weights_list[i])).eval())
hiddens = [
T.zeros((batch_size, layer_size)).eval()
for layer_size in layer_sizes
]
train_cost = []
train_cost_post = []
for i in range(len(train_X.get_value(borrow=True)) / batch_size):
xs = [
train_X.get_value(
borrow=True)[(i * batch_size) +
sequence_idx:((i + 1) * batch_size) +
sequence_idx]
for sequence_idx in range(len(Xs))
]
xs, hiddens = fix_input_size(xs, hiddens)
hiddens[0] = xs[0]
_ins = hiddens + xs
_outs = f_learn(*_ins)
hiddens = _outs[:len(hiddens)]
cost = _outs[-2]
cost_post = _outs[-1]
train_cost.append(cost)
train_cost_post.append(cost_post)
train_cost = numpy.mean(train_cost)
train_costs.append(train_cost)
train_cost_post = numpy.mean(train_cost_post)
train_costs_post.append(train_cost_post)
print 'Train : ', trunc(train_cost), trunc(train_cost_post), '\t',
with open(logfile, 'a') as f:
f.write("Train : {0!s} {1!s}\t".format(trunc(train_cost),
trunc(train_cost_post)))
with open(train_convergence_pre, 'a') as f:
f.write("{0!s},".format(train_cost))
with open(train_convergence_post, 'a') as f:
f.write("{0!s},".format(train_cost_post))
#valid
#init hiddens
hiddens = [
T.zeros((batch_size, layer_size)).eval()
for layer_size in layer_sizes
]
valid_cost = []
valid_cost_post = []
for i in range(len(valid_X.get_value(borrow=True)) / batch_size):
xs = [
valid_X.get_value(
borrow=True)[(i * batch_size) +
sequence_idx:((i + 1) * batch_size) +
sequence_idx]
for sequence_idx in range(len(Xs))
]
xs, hiddens = fix_input_size(xs, hiddens)
hiddens[0] = xs[0]
_ins = hiddens + xs
_outs = f_cost(*_ins)
hiddens = _outs[:-2]
cost = _outs[-2]
cost_post = _outs[-1]
valid_cost.append(cost)
valid_cost_post.append(cost_post)
valid_cost = numpy.mean(valid_cost)
valid_costs.append(valid_cost)
valid_cost_post = numpy.mean(valid_cost_post)
valid_costs_post.append(valid_cost_post)
print 'Valid : ', trunc(valid_cost), trunc(valid_cost_post), '\t',
with open(logfile, 'a') as f:
f.write("Valid : {0!s} {1!s}\t".format(trunc(valid_cost),
trunc(valid_cost_post)))
with open(valid_convergence_pre, 'a') as f:
f.write("{0!s},".format(valid_cost))
with open(valid_convergence_post, 'a') as f:
f.write("{0!s},".format(valid_cost_post))
#test
#init hiddens
hiddens = [
T.zeros((batch_size, layer_size)).eval()
for layer_size in layer_sizes
]
test_cost = []
test_cost_post = []
for i in range(len(test_X.get_value(borrow=True)) / batch_size):
xs = [
test_X.get_value(
borrow=True)[(i * batch_size) +
sequence_idx:((i + 1) * batch_size) +
sequence_idx]
for sequence_idx in range(len(Xs))
]
xs, hiddens = fix_input_size(xs, hiddens)
hiddens[0] = xs[0]
_ins = hiddens + xs
_outs = f_cost(*_ins)
hiddens = _outs[:-2]
cost = _outs[-2]
cost_post = _outs[-1]
test_cost.append(cost)
test_cost_post.append(cost_post)
test_cost = numpy.mean(test_cost)
test_costs.append(test_cost)
test_cost_post = numpy.mean(test_cost_post)
test_costs_post.append(test_cost_post)
print 'Test : ', trunc(test_cost), trunc(test_cost_post), '\t',
with open(logfile, 'a') as f:
f.write("Test : {0!s} {1!s}\t".format(trunc(test_cost),
trunc(test_cost_post)))
with open(test_convergence_pre, 'a') as f:
f.write("{0!s},".format(test_cost))
with open(test_convergence_post, 'a') as f:
f.write("{0!s},".format(test_cost_post))
#check for early stopping
cost = train_cost
if cost < best_cost * state.early_stop_threshold:
patience = 0
best_cost = cost
else:
patience += 1
if counter >= n_epoch or patience >= state.early_stop_length:
STOP = True
save_params_to_file('gsn', counter, params, iteration)
timing = time.time() - t
times.append(timing)
print 'time : ', trunc(timing),
print 'remaining: ', trunc(
(n_epoch - counter) * numpy.mean(times) / 60 / 60), 'hrs',
print 'B : ', [
trunc(abs(b.get_value(borrow=True)).mean()) for b in bias_list
],
print 'W : ', [
trunc(abs(w.get_value(borrow=True)).mean())
for w in weights_list
],
print 'V : ', [
trunc(abs(v.get_value(borrow=True)).mean())
for v in recurrent_weights_list
]
with open(logfile, 'a') as f:
f.write("MeanVisB : {0!s}\t".format(
trunc(bias_list[0].get_value().mean())))
with open(logfile, 'a') as f:
f.write("W : {0!s}\t".format(
str([
trunc(abs(w.get_value(borrow=True)).mean())
for w in weights_list
])))
with open(logfile, 'a') as f:
f.write("Time : {0!s} seconds\n".format(trunc(timing)))
if (counter % state.save_frequency) == 0:
# Checking reconstruction
nums = test_X.get_value()[range(100)]
noisy_nums = f_noise(test_X.get_value()[range(100)])
reconstructed_prediction = []
reconstructed_prediction_end = []
#init reconstruction hiddens
hiddens = [
T.zeros(layer_size).eval() for layer_size in layer_sizes
]
for num in noisy_nums:
hiddens[0] = num
for i in range(len(hiddens)):
if len(hiddens[i].shape
) == 2 and hiddens[i].shape[0] == 1:
hiddens[i] = hiddens[i][0]
_ins = hiddens + [num]
_outs = f_recon(*_ins)
hiddens = _outs[:len(hiddens)]
[reconstructed_1, reconstructed_n] = _outs[len(hiddens):]
reconstructed_prediction.append(reconstructed_1)
reconstructed_prediction_end.append(reconstructed_n)
with open(logfile, 'a') as f:
f.write("\n")
for i in range(len(nums)):
if len(
reconstructed_prediction[i].shape
) == 2 and reconstructed_prediction[i].shape[0] == 1:
reconstructed_prediction[i] = reconstructed_prediction[
i][0]
print nums[i].tolist(
), "->", reconstructed_prediction[i].tolist()
with open(logfile, 'a') as f:
f.write("{0!s} -> {1!s}\n".format(
nums[i].tolist(), [
trunc(n)
if n > 0.0001 else trunc(0.00000000000000000)
for n in reconstructed_prediction[i].tolist()
]))
with open(logfile, 'a') as f:
f.write("\n")
# # Concatenate stuff
# stacked = numpy.vstack([numpy.vstack([nums[i*10 : (i+1)*10], noisy_nums[i*10 : (i+1)*10], reconstructed_prediction[i*10 : (i+1)*10], reconstructed_prediction_end[i*10 : (i+1)*10]]) for i in range(10)])
# numbers_reconstruction = PIL.Image.fromarray(tile_raster_images(stacked, (root_N_input,root_N_input), (10,40)))
# numbers_reconstruction.save(outdir+'gsn_number_reconstruction_iteration_'+str(iteration)+'_epoch_'+str(counter)+'.png')
#
# #sample_numbers(counter, 'seven')
# plot_samples(counter, iteration)
#
# #save params
# save_params_to_file('gsn', counter, params, iteration)
# ANNEAL!
new_lr = learning_rate.get_value() * annealing
learning_rate.set_value(new_lr)
# 10k samples
print 'Generating 10,000 samples'
samples, _ = sample_some_numbers(N=10000)
f_samples = outdir + 'samples.npy'
numpy.save(f_samples, samples)
print 'saved digits'
def train_GSN(train_X, train_Y, valid_X, valid_Y, test_X, test_Y):
logger.log("\n-----------TRAINING GSN------------\n")
# TRAINING
n_epoch = state.n_epoch
batch_size = state.gsn_batch_size
STOP = False
counter = 0
learning_rate.set_value(cast32(state.learning_rate)) # learning rate
times = []
best_cost = float('inf')
best_params = None
patience = 0
logger.log(['train X size:', str(train_X.shape.eval())])
logger.log(['valid X size:', str(valid_X.shape.eval())])
logger.log(['test X size:', str(test_X.shape.eval())])
if state.vis_init:
bias_list[0].set_value(
logit(numpy.clip(0.9, 0.001,
train_X.get_value().mean(axis=0))))
if state.test_model:
# If testing, do not train and go directly to generating samples, parzen window estimation, and inpainting
logger.log('Testing : skip training')
STOP = True
while not STOP:
counter += 1
t = time.time()
logger.append([counter, '\t'])
#shuffle the data
data.sequence_mnist_data(train_X, train_Y, valid_X, valid_Y,
test_X, test_Y, dataset, rng)
#train
train_costs = []
for i in xrange(len(train_X.get_value(borrow=True)) / batch_size):
x = train_X.get_value()[i * batch_size:(i + 1) * batch_size]
cost = f_learn_gsn(x)
train_costs.append([cost])
train_costs = numpy.mean(train_costs)
# record it
logger.append(['Train:', trunc(train_costs), '\t'])
with open(gsn_train_convergence, 'a') as f:
f.write("{0!s},".format(train_costs))
f.write("\n")
#valid
valid_costs = []
for i in xrange(len(valid_X.get_value(borrow=True)) / batch_size):
x = valid_X.get_value()[i * batch_size:(i + 1) * batch_size]
cost = f_cost_gsn(x)
valid_costs.append([cost])
valid_costs = numpy.mean(valid_costs)
# record it
logger.append(['Valid:', trunc(valid_costs), '\t'])
with open(gsn_valid_convergence, 'a') as f:
f.write("{0!s},".format(valid_costs))
f.write("\n")
#test
test_costs = []
for i in xrange(len(test_X.get_value(borrow=True)) / batch_size):
x = test_X.get_value()[i * batch_size:(i + 1) * batch_size]
cost = f_cost_gsn(x)
test_costs.append([cost])
test_costs = numpy.mean(test_costs)
# record it
logger.append(['Test:', trunc(test_costs), '\t'])
with open(gsn_test_convergence, 'a') as f:
f.write("{0!s},".format(test_costs))
f.write("\n")
#check for early stopping
cost = numpy.sum(valid_costs)
if cost < best_cost * state.early_stop_threshold:
patience = 0
best_cost = cost
# save the parameters that made it the best
best_params = save_params(gsn_params)
else:
patience += 1
if counter >= n_epoch or patience >= state.early_stop_length:
STOP = True
if best_params is not None:
restore_params(gsn_params, best_params)
save_params_to_file('gsn', counter, gsn_params)
timing = time.time() - t
times.append(timing)
logger.append('time: ' + make_time_units_string(timing) + '\t')
logger.log('remaining: ' +
make_time_units_string((n_epoch - counter) *
numpy.mean(times)))
if (counter % state.save_frequency) == 0 or STOP is True:
n_examples = 100
random_idx = numpy.array(
R.sample(range(len(test_X.get_value(borrow=True))),
n_examples))
numbers = test_X.get_value(borrow=True)[random_idx]
noisy_numbers = f_noise(
test_X.get_value(borrow=True)[random_idx])
reconstructed = f_recon_gsn(noisy_numbers)
# Concatenate stuff
stacked = numpy.vstack([
numpy.vstack([
numbers[i * 10:(i + 1) * 10],
noisy_numbers[i * 10:(i + 1) * 10],
reconstructed[i * 10:(i + 1) * 10]
]) for i in range(10)
])
number_reconstruction = PIL.Image.fromarray(
tile_raster_images(stacked, (root_N_input, root_N_input),
(10, 30)))
number_reconstruction.save(outdir +
'gsn_number_reconstruction_epoch_' +
str(counter) + '.png')
#sample_numbers(counter, 'seven')
plot_samples(counter, 'gsn')
#save gsn_params
save_params_to_file('gsn', counter, gsn_params)
# ANNEAL!
new_lr = learning_rate.get_value() * annealing
learning_rate.set_value(new_lr)
# 10k samples
print 'Generating 10,000 samples'
samples, _ = sample_some_numbers(N=10000)
f_samples = outdir + 'samples.npy'
numpy.save(f_samples, samples)
print 'saved digits'
def train_RNN_GSN(train_X, train_Y, valid_X, valid_Y, test_X, test_Y):
# If we are using Hessian-free training
if state.hessian_free == 1:
pass
# gradient_dataset = hf_sequence_dataset([train_X.get_value()], batch_size=None, number_batches=5000)
# cg_dataset = hf_sequence_dataset([train_X.get_value()], batch_size=None, number_batches=1000)
# valid_dataset = hf_sequence_dataset([valid_X.get_value()], batch_size=None, number_batches=1000)
#
# s = x_samples
# costs = [cost, show_cost]
# hf_optimizer(params, [Xs], s, costs, u, ua).train(gradient_dataset, cg_dataset, initial_lambda=1.0, preconditioner=True, validation=valid_dataset)
# If we are using SGD training
else:
# Define the re-used loops for f_learn and f_cost
def apply_cost_function_to_dataset(function, dataset):
costs = []
for i in xrange(len(dataset.get_value(borrow=True)) / batch_size):
xs = dataset.get_value(borrow=True)[i * batch_size : (i+1) * batch_size]
cost = function(xs)
costs.append([cost])
return numpy.mean(costs)
logger.log("\n-----------TRAINING RNN-GSN------------\n")
# TRAINING
n_epoch = state.n_epoch
batch_size = state.batch_size
STOP = False
counter = 0
learning_rate.set_value(cast32(state.learning_rate)) # learning rate
times = []
best_cost = float('inf')
best_params = None
patience = 0
logger.log(['train X size:',str(train_X.shape.eval())])
logger.log(['valid X size:',str(valid_X.shape.eval())])
logger.log(['test X size:',str(test_X.shape.eval())])
if state.vis_init:
bias_list[0].set_value(logit(numpy.clip(0.9,0.001,train_X.get_value().mean(axis=0))))
if state.test_model:
# If testing, do not train and go directly to generating samples, parzen window estimation, and inpainting
logger.log('Testing : skip training')
STOP = True
while not STOP:
counter += 1
t = time.time()
logger.append([counter,'\t'])
#shuffle the data
data.sequence_mnist_data(train_X, train_Y, valid_X, valid_Y, test_X, test_Y, dataset, rng)
#train
train_costs = apply_cost_function_to_dataset(f_learn, train_X)
# record it
logger.append(['Train:',trunc(train_costs),'\t'])
with open(train_convergence,'a') as f:
f.write("{0!s},".format(train_costs))
f.write("\n")
#valid
valid_costs = apply_cost_function_to_dataset(f_cost, valid_X)
# record it
logger.append(['Valid:',trunc(valid_costs), '\t'])
with open(valid_convergence,'a') as f:
f.write("{0!s},".format(valid_costs))
f.write("\n")
#test
test_costs = apply_cost_function_to_dataset(f_cost, test_X)
# record it
logger.append(['Test:',trunc(test_costs), '\t'])
with open(test_convergence,'a') as f:
f.write("{0!s},".format(test_costs))
f.write("\n")
#check for early stopping
cost = numpy.sum(valid_costs)
if cost < best_cost*state.early_stop_threshold:
patience = 0
best_cost = cost
# save the parameters that made it the best
best_params = save_params(params)
else:
patience += 1
if counter >= n_epoch or patience >= state.early_stop_length:
STOP = True
if best_params is not None:
restore_params(params, best_params)
save_params_to_file('all', counter, params)
timing = time.time() - t
times.append(timing)
logger.append('time: '+make_time_units_string(timing)+'\t')
logger.log('remaining: '+make_time_units_string((n_epoch - counter) * numpy.mean(times)))
if (counter % state.save_frequency) == 0 or STOP is True:
n_examples = 100
nums = test_X.get_value(borrow=True)[range(n_examples)]
noisy_nums = f_noise(test_X.get_value(borrow=True)[range(n_examples)])
reconstructions = []
for i in xrange(0, len(noisy_nums)):
recon = f_recon(noisy_nums[max(0,(i+1)-batch_size):i+1])
reconstructions.append(recon)
reconstructed = numpy.array(reconstructions)
# Concatenate stuff
stacked = numpy.vstack([numpy.vstack([nums[i*10 : (i+1)*10], noisy_nums[i*10 : (i+1)*10], reconstructed[i*10 : (i+1)*10]]) for i in range(10)])
number_reconstruction = PIL.Image.fromarray(tile_raster_images(stacked, (root_N_input,root_N_input), (10,30)))
number_reconstruction.save(outdir+'rnngsn_number_reconstruction_epoch_'+str(counter)+'.png')
#sample_numbers(counter, 'seven')
plot_samples(counter, 'rnngsn')
#save params
save_params_to_file('all', counter, params)
# ANNEAL!
new_lr = learning_rate.get_value() * annealing
learning_rate.set_value(new_lr)
# 10k samples
print 'Generating 10,000 samples'
samples, _ = sample_some_numbers(N=10000)
f_samples = outdir+'samples.npy'
numpy.save(f_samples, samples)
print 'saved digits'
def experiment(state, outdir_base='./'):
rng.seed(1) #seed the numpy random generator
R.seed(
1
) #seed the other random generator (for reconstruction function indices)
# Initialize output directory and files
data.mkdir_p(outdir_base)
outdir = outdir_base + "/" + state.dataset + "/"
data.mkdir_p(outdir)
logger = Logger(outdir)
logger.log("----------MODEL 2, {0!s}-----------\n".format(state.dataset))
gsn_train_convergence = outdir + "gsn_train_convergence.csv"
gsn_valid_convergence = outdir + "gsn_valid_convergence.csv"
gsn_test_convergence = outdir + "gsn_test_convergence.csv"
train_convergence = outdir + "train_convergence.csv"
valid_convergence = outdir + "valid_convergence.csv"
test_convergence = outdir + "test_convergence.csv"
init_empty_file(gsn_train_convergence)
init_empty_file(gsn_valid_convergence)
init_empty_file(gsn_test_convergence)
init_empty_file(train_convergence)
init_empty_file(valid_convergence)
init_empty_file(test_convergence)
#load parameters from config file if this is a test
config_filename = outdir + 'config'
if state.test_model and 'config' in os.listdir(outdir):
config_vals = load_from_config(config_filename)
for CV in config_vals:
logger.log(CV)
if CV.startswith('test'):
logger.log('Do not override testing switch')
continue
try:
exec('state.' + CV) in globals(), locals()
except:
exec('state.' + CV.split('=')[0] + "='" + CV.split('=')[1] +
"'") in globals(), locals()
else:
# Save the current configuration
# Useful for logs/experiments
logger.log('Saving config')
with open(config_filename, 'w') as f:
f.write(str(state))
logger.log(state)
####################################################
# Load the data, train = train+valid, and sequence #
####################################################
artificial = False
if state.dataset == 'MNIST_1' or state.dataset == 'MNIST_2' or state.dataset == 'MNIST_3':
(train_X,
train_Y), (valid_X,
valid_Y), (test_X,
test_Y) = data.load_mnist(state.data_path)
train_X = numpy.concatenate((train_X, valid_X))
train_Y = numpy.concatenate((train_Y, valid_Y))
artificial = True
try:
dataset = int(state.dataset.split('_')[1])
except:
logger.log(
"ERROR: artificial dataset number not recognized. Input was " +
str(state.dataset))
raise AssertionError(
"artificial dataset number not recognized. Input was " +
str(state.dataset))
else:
logger.log("ERROR: dataset not recognized.")
raise AssertionError("dataset not recognized.")
train_X = theano.shared(train_X)
train_Y = theano.shared(train_Y)
valid_X = theano.shared(valid_X)
valid_Y = theano.shared(valid_Y)
test_X = theano.shared(test_X)
test_Y = theano.shared(test_Y)
if artificial:
logger.log('Sequencing MNIST data...')
logger.log(['train set size:', len(train_Y.eval())])
logger.log(['train set size:', len(valid_Y.eval())])
logger.log(['train set size:', len(test_Y.eval())])
data.sequence_mnist_data(train_X, train_Y, valid_X, valid_Y, test_X,
test_Y, dataset, rng)
logger.log(['train set size:', len(train_Y.eval())])
logger.log(['train set size:', len(valid_Y.eval())])
logger.log(['train set size:', len(test_Y.eval())])
logger.log('Sequencing done.\n')
N_input = train_X.eval().shape[1]
root_N_input = numpy.sqrt(N_input)
# Network and training specifications
layers = state.layers # number hidden layers
walkbacks = state.walkbacks # number of walkbacks
layer_sizes = [
N_input
] + [state.hidden_size
] * layers # layer sizes, from h0 to hK (h0 is the visible layer)
learning_rate = theano.shared(cast32(state.learning_rate)) # learning rate
annealing = cast32(state.annealing) # exponential annealing coefficient
momentum = theano.shared(cast32(state.momentum)) # momentum term
##############
# PARAMETERS #
##############
#gsn
weights_list = [
get_shared_weights(layer_sizes[i],
layer_sizes[i + 1],
name="W_{0!s}_{1!s}".format(i, i + 1))
for i in range(layers)
] # initialize each layer to uniform sample from sqrt(6. / (n_in + n_out))
bias_list = [
get_shared_bias(layer_sizes[i], name='b_' + str(i))
for i in range(layers + 1)
] # initialize each layer to 0's.
#recurrent
recurrent_to_gsn_weights_list = [
get_shared_weights(state.recurrent_hidden_size,
layer_sizes[layer],
name="W_u_h{0!s}".format(layer))
for layer in range(layers + 1) if (layer % 2) != 0
]
W_u_u = get_shared_weights(state.recurrent_hidden_size,
state.recurrent_hidden_size,
name="W_u_u")
W_x_u = get_shared_weights(N_input,
state.recurrent_hidden_size,
name="W_x_u")
recurrent_bias = get_shared_bias(state.recurrent_hidden_size, name='b_u')
#lists for use with gradients
gsn_params = weights_list + bias_list
u_params = [W_u_u, W_x_u, recurrent_bias]
params = gsn_params + recurrent_to_gsn_weights_list + u_params
###########################################################
# load initial parameters of gsn to speed up my debugging #
###########################################################
params_to_load = 'gsn_params.pkl'
initialized_gsn = False
if os.path.isfile(params_to_load):
logger.log("\nLoading existing GSN parameters\n")
loaded_params = cPickle.load(open(params_to_load, 'r'))
[
p.set_value(lp.get_value(borrow=False))
for lp, p in zip(loaded_params[:len(weights_list)], weights_list)
]
[
p.set_value(lp.get_value(borrow=False))
for lp, p in zip(loaded_params[len(weights_list):], bias_list)
]
initialized_gsn = True
############################
# Theano variables and RNG #
############################
MRG = RNG_MRG.MRG_RandomStreams(1)
X = T.fmatrix('X') #single (batch) for training gsn
Xs = T.fmatrix(name="Xs") #sequence for training rnn-gsn
########################
# ACTIVATION FUNCTIONS #
########################
# hidden activation
if state.hidden_act == 'sigmoid':
logger.log('Using sigmoid activation for hiddens')
hidden_activation = T.nnet.sigmoid
elif state.hidden_act == 'rectifier':
logger.log('Using rectifier activation for hiddens')
hidden_activation = lambda x: T.maximum(cast32(0), x)
elif state.hidden_act == 'tanh':
logger.log('Using hyperbolic tangent activation for hiddens')
hidden_activation = lambda x: T.tanh(x)
else:
logger.log(
"ERROR: Did not recognize hidden activation {0!s}, please use tanh, rectifier, or sigmoid"
.format(state.hidden_act))
raise AssertionError(
"Did not recognize hidden activation {0!s}, please use tanh, rectifier, or sigmoid"
.format(state.hidden_act))
# visible activation
if state.visible_act == 'sigmoid':
logger.log('Using sigmoid activation for visible layer')
visible_activation = T.nnet.sigmoid
elif state.visible_act == 'softmax':
logger.log('Using softmax activation for visible layer')
visible_activation = T.nnet.softmax
else:
logger.log(
"ERROR: Did not recognize visible activation {0!s}, please use sigmoid or softmax"
.format(state.visible_act))
raise AssertionError(
"Did not recognize visible activation {0!s}, please use sigmoid or softmax"
.format(state.visible_act))
# recurrent activation
if state.recurrent_hidden_act == 'sigmoid':
logger.log('Using sigmoid activation for recurrent hiddens')
recurrent_hidden_activation = T.nnet.sigmoid
elif state.recurrent_hidden_act == 'rectifier':
logger.log('Using rectifier activation for recurrent hiddens')
recurrent_hidden_activation = lambda x: T.maximum(cast32(0), x)
elif state.recurrent_hidden_act == 'tanh':
logger.log('Using hyperbolic tangent activation for recurrent hiddens')
recurrent_hidden_activation = lambda x: T.tanh(x)
else:
logger.log(
"ERROR: Did not recognize recurrent hidden activation {0!s}, please use tanh, rectifier, or sigmoid"
.format(state.recurrent_hidden_act))
raise AssertionError(
"Did not recognize recurrent hidden activation {0!s}, please use tanh, rectifier, or sigmoid"
.format(state.recurrent_hidden_act))
logger.log("\n")
####################
# COST FUNCTIONS #
####################
if state.cost_funct == 'binary_crossentropy':
logger.log('Using binary cross-entropy cost!')
cost_function = lambda x, y: T.mean(T.nnet.binary_crossentropy(x, y))
elif state.cost_funct == 'square':
logger.log("Using square error cost!")
#cost_function = lambda x,y: T.log(T.mean(T.sqr(x-y)))
cost_function = lambda x, y: T.log(T.sum(T.pow((x - y), 2)))
else:
logger.log(
"ERROR: Did not recognize cost function {0!s}, please use binary_crossentropy or square"
.format(state.cost_funct))
raise AssertionError(
"Did not recognize cost function {0!s}, please use binary_crossentropy or square"
.format(state.cost_funct))
logger.log("\n")
################################################
# COMPUTATIONAL GRAPH HELPER METHODS FOR GSN #
################################################
def update_layers(hiddens, p_X_chain, noisy=True):
logger.log('odd layer updates')
update_odd_layers(hiddens, noisy)
logger.log('even layer updates')
update_even_layers(hiddens, p_X_chain, noisy)
logger.log('done full update.\n')
def update_layers_reverse(hiddens, p_X_chain, noisy=True):
logger.log('even layer updates')
update_even_layers(hiddens, p_X_chain, noisy)
logger.log('odd layer updates')
update_odd_layers(hiddens, noisy)
logger.log('done full update.\n')
# Odd layer update function
# just a loop over the odd layers
def update_odd_layers(hiddens, noisy):
for i in range(1, len(hiddens), 2):
logger.log(['updating layer', i])
simple_update_layer(hiddens, None, i, add_noise=noisy)
# Even layer update
# p_X_chain is given to append the p(X|...) at each full update (one update = odd update + even update)
def update_even_layers(hiddens, p_X_chain, noisy):
for i in range(0, len(hiddens), 2):
logger.log(['updating layer', i])
simple_update_layer(hiddens, p_X_chain, i, add_noise=noisy)
# The layer update function
# hiddens : list containing the symbolic theano variables [visible, hidden1, hidden2, ...]
# layer_update will modify this list inplace
# p_X_chain : list containing the successive p(X|...) at each update
# update_layer will append to this list
# add_noise : pre and post activation gaussian noise
def simple_update_layer(hiddens, p_X_chain, i, add_noise=True):
# Compute the dot product, whatever layer
# If the visible layer X
if i == 0:
logger.log('using ' + str(weights_list[i]) + '.T')
hiddens[i] = T.dot(hiddens[i + 1],
weights_list[i].T) + bias_list[i]
# If the top layer
elif i == len(hiddens) - 1:
logger.log(['using', weights_list[i - 1]])
hiddens[i] = T.dot(hiddens[i - 1],
weights_list[i - 1]) + bias_list[i]
# Otherwise in-between layers
else:
logger.log("using {0!s} and {1!s}.T".format(
weights_list[i - 1], weights_list[i]))
# next layer : hiddens[i+1], assigned weights : W_i
# previous layer : hiddens[i-1], assigned weights : W_(i-1)
hiddens[i] = T.dot(hiddens[i + 1], weights_list[i].T) + T.dot(
hiddens[i - 1], weights_list[i - 1]) + bias_list[i]
# Add pre-activation noise if NOT input layer
if i == 1 and state.noiseless_h1:
logger.log('>>NO noise in first hidden layer')
add_noise = False
# pre activation noise
if i != 0 and add_noise:
logger.log(['Adding pre-activation gaussian noise for layer', i])
hiddens[i] = add_gaussian_noise(hiddens[i],
state.hidden_add_noise_sigma)
# ACTIVATION!
if i == 0:
logger.log('{} activation for visible layer'.format(
state.visible_act))
hiddens[i] = visible_activation(hiddens[i])
else:
logger.log([
'Hidden units {} activation for layer'.format(
state.hidden_act), i
])
hiddens[i] = hidden_activation(hiddens[i])
# post activation noise
# why is there post activation noise? Because there is already pre-activation noise, this just doubles the amount of noise between each activation of the hiddens.
if i != 0 and add_noise:
logger.log(['Adding post-activation gaussian noise for layer', i])
hiddens[i] = add_gaussian_noise(hiddens[i],
state.hidden_add_noise_sigma)
# build the reconstruction chain if updating the visible layer X
if i == 0:
# if input layer -> append p(X|...)
p_X_chain.append(hiddens[i])
# sample from p(X|...) - SAMPLING NEEDS TO BE CORRECT FOR INPUT TYPES I.E. FOR BINARY MNIST SAMPLING IS BINOMIAL. real-valued inputs should be gaussian
if state.input_sampling:
logger.log('Sampling from input')
sampled = MRG.binomial(p=hiddens[i],
size=hiddens[i].shape,
dtype='float32')
else:
logger.log('>>NO input sampling')
sampled = hiddens[i]
# add noise
sampled = salt_and_pepper(sampled, state.input_salt_and_pepper)
# set input layer
hiddens[i] = sampled
##############################################
# Build the training graph for the GSN #
##############################################
# the loop step for the rnn-gsn, return the sample and the costs
def create_gsn_reverse(x_t, u_tm1, noiseflag=True):
chain = []
# init hiddens from the u
hiddens_t = [T.zeros_like(x_t)]
for layer, w in enumerate(weights_list):
layer = layer + 1
# if this is an even layer, just append zeros
if layer % 2 == 0:
hiddens_t.append(T.zeros_like(T.dot(hiddens_t[-1], w)))
# if it is an odd layer, use the rnn to determine the layer
else:
hiddens_t.append(
hidden_activation(
T.dot(u_tm1, recurrent_to_gsn_weights_list[layer /
2]) +
bias_list[layer]))
for i in range(walkbacks):
logger.log("Reverse Walkback {!s}/{!s} for RNN-GSN".format(
i + 1, walkbacks))
update_layers_reverse(hiddens_t, chain, noiseflag)
x_sample = chain[-1]
costs = [cost_function(rX, x_t) for rX in chain]
show_cost = costs[-1]
cost = T.sum(costs)
return x_sample, cost, show_cost
# the GSN graph for the rnn-gsn
def build_gsn_given_u(xs, u, noiseflag=True):
logger.log("Creating recurrent gsn step scan.\n")
u0 = T.zeros((1, state.recurrent_hidden_size))
if u is None:
u = u0
else:
u = T.concatenate(
[u0, u]
) #add the initial u condition to the list of u's created from the recurrent scan op.
(samples, costs, show_costs), updates = theano.scan(
lambda x_t, u_tm1: create_gsn_reverse(x_t, u_tm1, noiseflag),
sequences=[xs, u])
cost = T.sum(costs)
show_cost = T.mean(show_costs)
last_sample = samples[-1]
return last_sample, cost, show_cost, updates
def build_gsn_given_u0(x, u0, noiseflag=True):
x_sample, _, _ = create_gsn_reverse(x, u0, noiseflag)
return x_sample
# the GSN graph for initial GSN training
def build_gsn_graph(x, noiseflag):
p_X_chain = []
if noiseflag:
X_init = salt_and_pepper(x, state.input_salt_and_pepper)
else:
X_init = x
# init hiddens with zeros
hiddens = [X_init]
for w in weights_list:
hiddens.append(T.zeros_like(T.dot(hiddens[-1], w)))
# The layer update scheme
logger.log(["Building the gsn graph :", walkbacks, "updates"])
for i in range(walkbacks):
logger.log("GSN Walkback {!s}/{!s}".format(i + 1, walkbacks))
update_layers(hiddens, p_X_chain, noisy=noiseflag)
return p_X_chain
'''Build the actual gsn training graph'''
p_X_chain_gsn = build_gsn_graph(X, noiseflag=True)
##############################################
# Build the training graph for the RNN-GSN #
##############################################
# If `x_t` is given, deterministic recurrence to compute the u_t. Otherwise, first generate
def recurrent_step(x_t, u_tm1):
ua_t = T.dot(x_t, W_x_u) + T.dot(u_tm1, W_u_u) + recurrent_bias
u_t = recurrent_hidden_activation(ua_t)
return ua_t, u_t
logger.log("\nCreating recurrent step scan.")
# For training, the deterministic recurrence is used to compute all the
# {h_t, 1 <= t <= T} given Xs. Conditional GSNs can then be trained
# in batches using those parameters.
u0 = T.zeros((state.recurrent_hidden_size,
)) # initial value for the RNN hidden units
(_, u), updates_recurrent = theano.scan(
lambda x_t, u_tm1: recurrent_step(x_t, u_tm1),
sequences=Xs,
outputs_info=[None, u0])
_, cost, show_cost, updates_gsn = build_gsn_given_u(Xs, u, noiseflag=True)
updates_recurrent.update(updates_gsn)
updates_train = updates_recurrent
updates_cost = updates_recurrent
################################################
# Build the checkpoint graph for the RNN-GSN #
################################################
# Used to generate the next predicted output given all previous inputs - starting with nothing
# When there is no X history
x_sample_R_init = build_gsn_given_u0(X, u0, noiseflag=False)
# When there is some number of Xs history
x_sample_R, _, _, updates_gsn_R = build_gsn_given_u(Xs, u, noiseflag=False)
#############
# COSTS #
#############
logger.log("")
logger.log('Cost w.r.t p(X|...) at every step in the graph')
gsn_costs = [cost_function(rX, X) for rX in p_X_chain_gsn]
gsn_show_cost = gsn_costs[-1]
gsn_cost = numpy.sum(gsn_costs)
###################################
# GRADIENTS AND FUNCTIONS FOR GSN #
###################################
logger.log(["params:", params])
logger.log("creating functions...")
start_functions_time = time.time()
gradient_gsn = T.grad(gsn_cost, gsn_params)
gradient_buffer_gsn = [
theano.shared(numpy.zeros(param.get_value().shape, dtype='float32'))
for param in gsn_params
]
m_gradient_gsn = [
momentum * gb + (cast32(1) - momentum) * g
for (gb, g) in zip(gradient_buffer_gsn, gradient_gsn)
]
param_updates_gsn = [(param, param - learning_rate * mg)
for (param, mg) in zip(gsn_params, m_gradient_gsn)]
gradient_buffer_updates_gsn = zip(gradient_buffer_gsn, m_gradient_gsn)
grad_updates_gsn = OrderedDict(param_updates_gsn +
gradient_buffer_updates_gsn)
f_cost_gsn = theano.function(inputs=[X],
outputs=gsn_show_cost,
on_unused_input='warn')
f_learn_gsn = theano.function(inputs=[X],
updates=grad_updates_gsn,
outputs=gsn_show_cost,
on_unused_input='warn')
#######################################
# GRADIENTS AND FUNCTIONS FOR RNN-GSN #
#######################################
# if we are not using Hessian-free training create the normal sgd functions
if state.hf == 0:
gradient = T.grad(cost, params)
gradient_buffer = [
theano.shared(numpy.zeros(param.get_value().shape,
dtype='float32')) for param in params
]
m_gradient = [
momentum * gb + (cast32(1) - momentum) * g
for (gb, g) in zip(gradient_buffer, gradient)
]
param_updates = [(param, param - learning_rate * mg)
for (param, mg) in zip(params, m_gradient)]
gradient_buffer_updates = zip(gradient_buffer, m_gradient)
updates = OrderedDict(param_updates + gradient_buffer_updates)
updates_train.update(updates)
f_learn = theano.function(inputs=[Xs],
updates=updates_train,
outputs=show_cost,
on_unused_input='warn')
f_cost = theano.function(inputs=[Xs],
updates=updates_cost,
outputs=show_cost,
on_unused_input='warn')
logger.log("Training/cost functions done.")
compilation_time = time.time() - start_functions_time
# Show the compile time with appropriate easy-to-read units.
if compilation_time < 60:
logger.log(["Compilation took", compilation_time, "seconds.\n\n"])
elif compilation_time < 3600:
logger.log(["Compilation took", compilation_time / 60, "minutes.\n\n"])
else:
logger.log(["Compilation took", compilation_time / 3600, "hours.\n\n"])
############################################################################################
# Denoise some numbers : show number, noisy number, predicted number, reconstructed number #
############################################################################################
# Recompile the graph without noise for reconstruction function
# The layer update scheme
logger.log(
"Creating graph for noisy reconstruction function at checkpoints during training."
)
f_recon_init = theano.function(inputs=[X],
outputs=x_sample_R_init,
on_unused_input='warn')
f_recon = theano.function(inputs=[Xs],
outputs=x_sample_R,
updates=updates_gsn_R)
# Now do the same but for the GSN in the initial run
p_X_chain_R = build_gsn_graph(X, noiseflag=False)
f_recon_gsn = theano.function(inputs=[X], outputs=p_X_chain_R[-1])
logger.log("Done compiling all functions.")
compilation_time = time.time() - start_functions_time
# Show the compile time with appropriate easy-to-read units.
if compilation_time < 60:
logger.log(["Total time took", compilation_time, "seconds.\n\n"])
elif compilation_time < 3600:
logger.log(["Total time took", compilation_time / 60, "minutes.\n\n"])
else:
logger.log(["Total time took", compilation_time / 3600, "hours.\n\n"])
############
# Sampling #
############
# a function to add salt and pepper noise
f_noise = theano.function(inputs=[X],
outputs=salt_and_pepper(
X, state.input_salt_and_pepper))
# the input to the sampling function
X_sample = T.fmatrix("X_sampling")
network_state_input = [X_sample] + [
T.fmatrix("H_sampling_" + str(i + 1)) for i in range(layers)
]
# "Output" state of the network (noisy)
# initialized with input, then we apply updates
network_state_output = [X_sample] + network_state_input[1:]
visible_pX_chain = []
# ONE update
logger.log("Performing one walkback in network state sampling.")
update_layers(network_state_output, visible_pX_chain, noisy=True)
if layers == 1:
f_sample_simple = theano.function(inputs=[X_sample],
outputs=visible_pX_chain[-1])
# WHY IS THERE A WARNING????
# because the first odd layers are not used -> directly computed FROM THE EVEN layers
# unused input = warn
f_sample2 = theano.function(inputs=network_state_input,
outputs=network_state_output +
visible_pX_chain,
on_unused_input='warn')
def sample_some_numbers_single_layer():
x0 = test_X.get_value()[:1]
samples = [x0]
x = f_noise(x0)
for i in range(399):
x = f_sample_simple(x)
samples.append(x)
x = numpy.random.binomial(n=1, p=x, size=x.shape).astype('float32')
x = f_noise(x)
return numpy.vstack(samples)
def sampling_wrapper(NSI):
# * is the "splat" operator: It takes a list as input, and expands it into actual positional arguments in the function call.
out = f_sample2(*NSI)
NSO = out[:len(network_state_output)]
vis_pX_chain = out[len(network_state_output):]
return NSO, vis_pX_chain
def sample_some_numbers(N=400):
# The network's initial state
init_vis = test_X.get_value()[:1]
noisy_init_vis = f_noise(init_vis)
network_state = [[noisy_init_vis] + [
numpy.zeros((1, len(b.get_value())), dtype='float32')
for b in bias_list[1:]
]]
visible_chain = [init_vis]
noisy_h0_chain = [noisy_init_vis]
for i in range(N - 1):
# feed the last state into the network, compute new state, and obtain visible units expectation chain
net_state_out, vis_pX_chain = sampling_wrapper(network_state[-1])
# append to the visible chain
visible_chain += vis_pX_chain
# append state output to the network state chain
network_state.append(net_state_out)
noisy_h0_chain.append(net_state_out[0])
return numpy.vstack(visible_chain), numpy.vstack(noisy_h0_chain)
def plot_samples(epoch_number, leading_text):
to_sample = time.time()
if layers == 1:
# one layer model
V = sample_some_numbers_single_layer()
else:
V, H0 = sample_some_numbers()
img_samples = PIL.Image.fromarray(
tile_raster_images(V, (root_N_input, root_N_input), (20, 20)))
fname = outdir + leading_text + 'samples_epoch_' + str(
epoch_number) + '.png'
img_samples.save(fname)
logger.log('Took ' + str(time.time() - to_sample) +
' to sample 400 numbers')
#############################
# Save the model parameters #
#############################
def save_params_to_file(name, n, gsn_params):
pass
print 'saving parameters...'
save_path = outdir + name + '_params_epoch_' + str(n) + '.pkl'
f = open(save_path, 'wb')
try:
cPickle.dump(gsn_params, f, protocol=cPickle.HIGHEST_PROTOCOL)
finally:
f.close()
def save_params(params):
values = [param.get_value(borrow=True) for param in params]
return values
def restore_params(params, values):
for i in range(len(params)):
params[i].set_value(values[i])
################
# GSN TRAINING #
################
def train_GSN(train_X, train_Y, valid_X, valid_Y, test_X, test_Y):
logger.log("\n-----------TRAINING GSN------------\n")
# TRAINING
n_epoch = state.n_epoch
batch_size = state.gsn_batch_size
STOP = False
counter = 0
learning_rate.set_value(cast32(state.learning_rate)) # learning rate
times = []
best_cost = float('inf')
best_params = None
patience = 0
logger.log(['train X size:', str(train_X.shape.eval())])
logger.log(['valid X size:', str(valid_X.shape.eval())])
logger.log(['test X size:', str(test_X.shape.eval())])
if state.vis_init:
bias_list[0].set_value(
logit(numpy.clip(0.9, 0.001,
train_X.get_value().mean(axis=0))))
if state.test_model:
# If testing, do not train and go directly to generating samples, parzen window estimation, and inpainting
logger.log('Testing : skip training')
STOP = True
while not STOP:
counter += 1
t = time.time()
logger.append([counter, '\t'])
#shuffle the data
data.sequence_mnist_data(train_X, train_Y, valid_X, valid_Y,
test_X, test_Y, dataset, rng)
#train
train_costs = []
for i in xrange(len(train_X.get_value(borrow=True)) / batch_size):
x = train_X.get_value()[i * batch_size:(i + 1) * batch_size]
cost = f_learn_gsn(x)
train_costs.append([cost])
train_costs = numpy.mean(train_costs)
# record it
logger.append(['Train:', trunc(train_costs), '\t'])
with open(gsn_train_convergence, 'a') as f:
f.write("{0!s},".format(train_costs))
f.write("\n")
#valid
valid_costs = []
for i in xrange(len(valid_X.get_value(borrow=True)) / batch_size):
x = valid_X.get_value()[i * batch_size:(i + 1) * batch_size]
cost = f_cost_gsn(x)
valid_costs.append([cost])
valid_costs = numpy.mean(valid_costs)
# record it
logger.append(['Valid:', trunc(valid_costs), '\t'])
with open(gsn_valid_convergence, 'a') as f:
f.write("{0!s},".format(valid_costs))
f.write("\n")
#test
test_costs = []
for i in xrange(len(test_X.get_value(borrow=True)) / batch_size):
x = test_X.get_value()[i * batch_size:(i + 1) * batch_size]
cost = f_cost_gsn(x)
test_costs.append([cost])
test_costs = numpy.mean(test_costs)
# record it
logger.append(['Test:', trunc(test_costs), '\t'])
with open(gsn_test_convergence, 'a') as f:
f.write("{0!s},".format(test_costs))
f.write("\n")
#check for early stopping
cost = numpy.sum(valid_costs)
if cost < best_cost * state.early_stop_threshold:
patience = 0
best_cost = cost
# save the parameters that made it the best
best_params = save_params(gsn_params)
else:
patience += 1
if counter >= n_epoch or patience >= state.early_stop_length:
STOP = True
if best_params is not None:
restore_params(gsn_params, best_params)
save_params_to_file('gsn', counter, gsn_params)
timing = time.time() - t
times.append(timing)
logger.append(['time:', trunc(timing)])
logger.log([
'remaining:',
trunc((n_epoch - counter) * numpy.mean(times) / 60 / 60), 'hrs'
])
if (counter % state.save_frequency) == 0 or STOP is True:
n_examples = 100
random_idx = numpy.array(
R.sample(range(len(test_X.get_value(borrow=True))),
n_examples))
numbers = test_X.get_value(borrow=True)[random_idx]
noisy_numbers = f_noise(
test_X.get_value(borrow=True)[random_idx])
reconstructed = f_recon_gsn(noisy_numbers)
# Concatenate stuff
stacked = numpy.vstack([
numpy.vstack([
numbers[i * 10:(i + 1) * 10],
noisy_numbers[i * 10:(i + 1) * 10],
reconstructed[i * 10:(i + 1) * 10]
]) for i in range(10)
])
number_reconstruction = PIL.Image.fromarray(
tile_raster_images(stacked, (root_N_input, root_N_input),
(10, 30)))
number_reconstruction.save(outdir +
'gsn_number_reconstruction_epoch_' +
str(counter) + '.png')
#sample_numbers(counter, 'seven')
plot_samples(counter, 'gsn')
#save gsn_params
save_params_to_file('gsn', counter, gsn_params)
# ANNEAL!
new_lr = learning_rate.get_value() * annealing
learning_rate.set_value(new_lr)
# 10k samples
print 'Generating 10,000 samples'
samples, _ = sample_some_numbers(N=10000)
f_samples = outdir + 'samples.npy'
numpy.save(f_samples, samples)
print 'saved digits'
def train_RNN_GSN(train_X, train_Y, valid_X, valid_Y, test_X, test_Y):
# If we are using Hessian-free training
if state.hf == 1:
pass
# gradient_dataset = hf_sequence_dataset([train_X.get_value()], batch_size=None, number_batches=5000)
# cg_dataset = hf_sequence_dataset([train_X.get_value()], batch_size=None, number_batches=1000)
# valid_dataset = hf_sequence_dataset([valid_X.get_value()], batch_size=None, number_batches=1000)
#
# s = x_samples
# costs = [cost, show_cost]
# hf_optimizer(params, [Xs], s, costs, u, ua).train(gradient_dataset, cg_dataset, initial_lambda=1.0, preconditioner=True, validation=valid_dataset)
# If we are using SGD training
else:
logger.log("\n-----------TRAINING RNN-GSN------------\n")
# TRAINING
n_epoch = state.n_epoch
batch_size = state.batch_size
STOP = False
counter = 0
learning_rate.set_value(cast32(
state.learning_rate)) # learning rate
times = []
best_cost = float('inf')
best_params = None
patience = 0
logger.log(['train X size:', str(train_X.shape.eval())])
logger.log(['valid X size:', str(valid_X.shape.eval())])
logger.log(['test X size:', str(test_X.shape.eval())])
if state.vis_init:
bias_list[0].set_value(
logit(
numpy.clip(0.9, 0.001,
train_X.get_value().mean(axis=0))))
if state.test_model:
# If testing, do not train and go directly to generating samples, parzen window estimation, and inpainting
logger.log('Testing : skip training')
STOP = True
while not STOP:
counter += 1
t = time.time()
logger.append([counter, '\t'])
#shuffle the data
data.sequence_mnist_data(train_X, train_Y, valid_X, valid_Y,
test_X, test_Y, dataset, rng)
#train
train_costs = []
for i in xrange(
len(train_X.get_value(borrow=True)) / batch_size):
xs = train_X.get_value(
borrow=True)[i * batch_size:(i + 1) * batch_size]
cost = f_learn(xs)
train_costs.append([cost])
train_costs = numpy.mean(train_costs)
# record it
logger.append(['Train:', trunc(train_costs), '\t'])
with open(train_convergence, 'a') as f:
f.write("{0!s},".format(train_costs))
f.write("\n")
#valid
valid_costs = []
for i in xrange(
len(valid_X.get_value(borrow=True)) / batch_size):
xs = valid_X.get_value(
borrow=True)[i * batch_size:(i + 1) * batch_size]
cost = f_cost(xs)
valid_costs.append([cost])
valid_costs = numpy.mean(valid_costs)
# record it
logger.append(['Valid:', trunc(valid_costs), '\t'])
with open(valid_convergence, 'a') as f:
f.write("{0!s},".format(valid_costs))
f.write("\n")
#test
test_costs = []
for i in xrange(
len(test_X.get_value(borrow=True)) / batch_size):
xs = test_X.get_value(borrow=True)[i * batch_size:(i + 1) *
batch_size]
cost = f_cost(xs)
test_costs.append([cost])
test_costs = numpy.mean(test_costs)
# record it
logger.append(['Test:', trunc(test_costs), '\t'])
with open(test_convergence, 'a') as f:
f.write("{0!s},".format(test_costs))
f.write("\n")
#check for early stopping
cost = numpy.sum(valid_costs)
if cost < best_cost * state.early_stop_threshold:
patience = 0
best_cost = cost
# save the parameters that made it the best
best_params = save_params(params)
else:
patience += 1
if counter >= n_epoch or patience >= state.early_stop_length:
STOP = True
if best_params is not None:
restore_params(params, best_params)
save_params_to_file('all', counter, params)
timing = time.time() - t
times.append(timing)
logger.append(['time:', trunc(timing)])
logger.log([
'remaining:',
trunc((n_epoch - counter) * numpy.mean(times) / 60 / 60),
'hrs'
])
if (counter % state.save_frequency) == 0 or STOP is True:
n_examples = 100
nums = test_X.get_value(borrow=True)[range(n_examples)]
noisy_nums = f_noise(
test_X.get_value(borrow=True)[range(n_examples)])
reconstructions = []
for i in xrange(0, len(noisy_nums)):
if i is 0:
recon = f_recon_init(noisy_nums[:i + 1])
else:
recon = f_recon(
noisy_nums[max(0, (i + 1) - batch_size):i + 1])
reconstructions.append(recon)
reconstructed = numpy.array(reconstructions)
# Concatenate stuff
stacked = numpy.vstack([
numpy.vstack([
nums[i * 10:(i + 1) * 10],
noisy_nums[i * 10:(i + 1) * 10],
reconstructed[i * 10:(i + 1) * 10]
]) for i in range(10)
])
number_reconstruction = PIL.Image.fromarray(
tile_raster_images(stacked,
(root_N_input, root_N_input),
(10, 30)))
number_reconstruction.save(
outdir + 'rnngsn_number_reconstruction_epoch_' +
str(counter) + '.png')
#sample_numbers(counter, 'seven')
plot_samples(counter, 'rnngsn')
#save params
save_params_to_file('all', counter, params)
# ANNEAL!
new_lr = learning_rate.get_value() * annealing
learning_rate.set_value(new_lr)
# 10k samples
print 'Generating 10,000 samples'
samples, _ = sample_some_numbers(N=10000)
f_samples = outdir + 'samples.npy'
numpy.save(f_samples, samples)
print 'saved digits'
#####################
# STORY 2 ALGORITHM #
#####################
# train the GSN parameters first to get a good baseline (if not loaded from parameter .pkl file)
if initialized_gsn is False:
train_GSN(train_X, train_Y, valid_X, valid_Y, test_X, test_Y)
# train the entire RNN-GSN
train_RNN_GSN(train_X, train_Y, valid_X, valid_Y, test_X, test_Y)
def experiment(state, outdir_base='./'):
rng.seed(1) #seed the numpy random generator
R.seed(
1
) #seed the other random generator (for reconstruction function indices)
# Initialize output directory and files
data.mkdir_p(outdir_base)
outdir = outdir_base + "/" + state.dataset + "/"
data.mkdir_p(outdir)
logger = Logger(outdir)
logger.log("----------MODEL 2, {0!s}-----------\n".format(state.dataset))
if state.initialize_gsn:
gsn_train_convergence = outdir + "gsn_train_convergence.csv"
gsn_valid_convergence = outdir + "gsn_valid_convergence.csv"
gsn_test_convergence = outdir + "gsn_test_convergence.csv"
train_convergence = outdir + "train_convergence.csv"
valid_convergence = outdir + "valid_convergence.csv"
test_convergence = outdir + "test_convergence.csv"
if state.initialize_gsn:
init_empty_file(gsn_train_convergence)
init_empty_file(gsn_valid_convergence)
init_empty_file(gsn_test_convergence)
init_empty_file(train_convergence)
init_empty_file(valid_convergence)
init_empty_file(test_convergence)
#load parameters from config file if this is a test
config_filename = outdir + 'config'
if state.test_model and 'config' in os.listdir(outdir):
config_vals = load_from_config(config_filename)
for CV in config_vals:
logger.log(CV)
if CV.startswith('test'):
logger.log('Do not override testing switch')
continue
try:
exec('state.' + CV) in globals(), locals()
except:
exec('state.' + CV.split('=')[0] + "='" + CV.split('=')[1] +
"'") in globals(), locals()
else:
# Save the current configuration
# Useful for logs/experiments
logger.log('Saving config')
with open(config_filename, 'w') as f:
f.write(str(state))
logger.log(state)
####################################################
# Load the data, train = train+valid, and sequence #
####################################################
artificial = False
if state.dataset == 'MNIST_1' or state.dataset == 'MNIST_2' or state.dataset == 'MNIST_3':
(train_X,
train_Y), (valid_X,
valid_Y), (test_X,
test_Y) = data.load_mnist(state.data_path)
train_X = numpy.concatenate((train_X, valid_X))
train_Y = numpy.concatenate((train_Y, valid_Y))
artificial = True
try:
dataset = int(state.dataset.split('_')[1])
except:
logger.log(
"ERROR: artificial dataset number not recognized. Input was " +
str(state.dataset))
raise AssertionError(
"artificial dataset number not recognized. Input was " +
str(state.dataset))
else:
logger.log("ERROR: dataset not recognized.")
raise AssertionError("dataset not recognized.")
# transfer the datasets into theano shared variables
train_X, train_Y = data.shared_dataset((train_X, train_Y), borrow=True)
valid_X, valid_Y = data.shared_dataset((valid_X, valid_Y), borrow=True)
test_X, test_Y = data.shared_dataset((test_X, test_Y), borrow=True)
if artificial:
logger.log('Sequencing MNIST data...')
logger.log(['train set size:', len(train_Y.eval())])
logger.log(['train set size:', len(valid_Y.eval())])
logger.log(['train set size:', len(test_Y.eval())])
data.sequence_mnist_data(train_X, train_Y, valid_X, valid_Y, test_X,
test_Y, dataset, rng)
logger.log(['train set size:', len(train_Y.eval())])
logger.log(['train set size:', len(valid_Y.eval())])
logger.log(['train set size:', len(test_Y.eval())])
logger.log('Sequencing done.\n')
N_input = train_X.eval().shape[1]
root_N_input = numpy.sqrt(N_input)
# Network and training specifications
layers = state.layers # number hidden layers
walkbacks = state.walkbacks # number of walkbacks
layer_sizes = [
N_input
] + [state.hidden_size
] * layers # layer sizes, from h0 to hK (h0 is the visible layer)
learning_rate = theano.shared(cast32(state.learning_rate)) # learning rate
annealing = cast32(state.annealing) # exponential annealing coefficient
momentum = theano.shared(cast32(state.momentum)) # momentum term
##############
# PARAMETERS #
##############
#gsn
weights_list = [
get_shared_weights(layer_sizes[i],
layer_sizes[i + 1],
name="W_{0!s}_{1!s}".format(i, i + 1))
for i in range(layers)
] # initialize each layer to uniform sample from sqrt(6. / (n_in + n_out))
bias_list = [
get_shared_bias(layer_sizes[i], name='b_' + str(i))
for i in range(layers + 1)
] # initialize each layer to 0's.
#recurrent
recurrent_to_gsn_bias_weights_list = [
get_shared_weights(state.recurrent_hidden_size,
layer_sizes[layer],
name="W_u_b{0!s}".format(layer))
for layer in range(layers + 1)
]
W_u_u = get_shared_weights(state.recurrent_hidden_size,
state.recurrent_hidden_size,
name="W_u_u")
W_x_u = get_shared_weights(N_input,
state.recurrent_hidden_size,
name="W_x_u")
recurrent_bias = get_shared_bias(state.recurrent_hidden_size, name='b_u')
#lists for use with gradients
gsn_params = weights_list + bias_list
u_params = [W_u_u, W_x_u, recurrent_bias]
params = gsn_params + recurrent_to_gsn_bias_weights_list + u_params
###########################################################
# load initial parameters of gsn #
###########################################################
train_gsn_first = False
if state.initialize_gsn:
params_to_load = 'gsn_params.pkl'
if not os.path.isfile(params_to_load):
train_gsn_first = True
else:
logger.log("\nLoading existing GSN parameters\n")
loaded_params = cPickle.load(open(params_to_load, 'r'))
[
p.set_value(lp.get_value(borrow=False)) for lp, p in zip(
loaded_params[:len(weights_list)], weights_list)
]
[
p.set_value(lp.get_value(borrow=False))
for lp, p in zip(loaded_params[len(weights_list):], bias_list)
]
############################
# Theano variables and RNG #
############################
MRG = RNG_MRG.MRG_RandomStreams(1)
X = T.fmatrix('X') #single (batch) for training gsn
Xs = T.fmatrix(name="Xs") #sequence for training rnn-gsn
########################
# ACTIVATION FUNCTIONS #
########################
# hidden activation
if state.hidden_act == 'sigmoid':
logger.log('Using sigmoid activation for hiddens')
hidden_activation = T.nnet.sigmoid
elif state.hidden_act == 'rectifier':
logger.log('Using rectifier activation for hiddens')
hidden_activation = lambda x: T.maximum(cast32(0), x)
elif state.hidden_act == 'tanh':
logger.log('Using hyperbolic tangent activation for hiddens')
hidden_activation = lambda x: T.tanh(x)
else:
logger.log(
"ERROR: Did not recognize hidden activation {0!s}, please use tanh, rectifier, or sigmoid"
.format(state.hidden_act))
raise NotImplementedError(
"Did not recognize hidden activation {0!s}, please use tanh, rectifier, or sigmoid"
.format(state.hidden_act))
# visible activation
if state.visible_act == 'sigmoid':
logger.log('Using sigmoid activation for visible layer')
visible_activation = T.nnet.sigmoid
elif state.visible_act == 'softmax':
logger.log('Using softmax activation for visible layer')
visible_activation = T.nnet.softmax
else:
logger.log(
"ERROR: Did not recognize visible activation {0!s}, please use sigmoid or softmax"
.format(state.visible_act))
raise NotImplementedError(
"Did not recognize visible activation {0!s}, please use sigmoid or softmax"
.format(state.visible_act))
# recurrent activation
if state.recurrent_hidden_act == 'sigmoid':
logger.log('Using sigmoid activation for recurrent hiddens')
recurrent_hidden_activation = T.nnet.sigmoid
elif state.recurrent_hidden_act == 'rectifier':
logger.log('Using rectifier activation for recurrent hiddens')
recurrent_hidden_activation = lambda x: T.maximum(cast32(0), x)
elif state.recurrent_hidden_act == 'tanh':
logger.log('Using hyperbolic tangent activation for recurrent hiddens')
recurrent_hidden_activation = lambda x: T.tanh(x)
else:
logger.log(
"ERROR: Did not recognize recurrent hidden activation {0!s}, please use tanh, rectifier, or sigmoid"
.format(state.recurrent_hidden_act))
raise NotImplementedError(
"Did not recognize recurrent hidden activation {0!s}, please use tanh, rectifier, or sigmoid"
.format(state.recurrent_hidden_act))
logger.log("\n")
####################
# COST FUNCTIONS #
####################
if state.cost_funct == 'binary_crossentropy':
logger.log('Using binary cross-entropy cost!')
cost_function = lambda x, y: T.mean(T.nnet.binary_crossentropy(x, y))
elif state.cost_funct == 'square':
logger.log("Using square error cost!")
#cost_function = lambda x,y: T.log(T.mean(T.sqr(x-y)))
cost_function = lambda x, y: T.log(T.sum(T.pow((x - y), 2)))
else:
logger.log(
"ERROR: Did not recognize cost function {0!s}, please use binary_crossentropy or square"
.format(state.cost_funct))
raise NotImplementedError(
"Did not recognize cost function {0!s}, please use binary_crossentropy or square"
.format(state.cost_funct))
logger.log("\n")
##############################################
# Build the training graph for the GSN #
##############################################
if train_gsn_first:
'''Build the actual gsn training graph'''
p_X_chain_gsn, _ = generative_stochastic_network.build_gsn(
X, weights_list, bias_list, True, state.noiseless_h1,
state.hidden_add_noise_sigma, state.input_salt_and_pepper,
state.input_sampling, MRG, visible_activation, hidden_activation,
walkbacks, logger)
# now without noise
p_X_chain_gsn_recon, _ = generative_stochastic_network.build_gsn(
X, weights_list, bias_list, False, state.noiseless_h1,
state.hidden_add_noise_sigma, state.input_salt_and_pepper,
state.input_sampling, MRG, visible_activation, hidden_activation,
walkbacks, logger)
##############################################
# Build the training graph for the RNN-GSN #
##############################################
# If `x_t` is given, deterministic recurrence to compute the u_t. Otherwise, first generate
def recurrent_step(x_t, u_tm1):
bv_t = bias_list[0] + T.dot(u_tm1,
recurrent_to_gsn_bias_weights_list[0])
bh_t = T.concatenate([
bias_list[i + 1] +
T.dot(u_tm1, recurrent_to_gsn_bias_weights_list[i + 1])
for i in range(layers)
],
axis=0)
generate = x_t is None
if generate:
pass
ua_t = T.dot(x_t, W_x_u) + T.dot(u_tm1, W_u_u) + recurrent_bias
u_t = recurrent_hidden_activation(ua_t)
return None if generate else [ua_t, u_t, bv_t, bh_t]
logger.log("\nCreating recurrent step scan.")
# For training, the deterministic recurrence is used to compute all the
# {h_t, 1 <= t <= T} given Xs. Conditional GSNs can then be trained
# in batches using those parameters.
u0 = T.zeros((state.recurrent_hidden_size,
)) # initial value for the RNN hidden units
(ua, u, bv_t, bh_t), updates_recurrent = theano.scan(
fn=lambda x_t, u_tm1, *_: recurrent_step(x_t, u_tm1),
sequences=Xs,
outputs_info=[None, u0, None, None],
non_sequences=params)
# put the bias_list together from hiddens and visible biases
#b_list = [bv_t.flatten(2)] + [bh_t.dimshuffle((1,0,2))[i] for i in range(len(weights_list))]
b_list = [bv_t] + [
(bh_t.T[i * state.hidden_size:(i + 1) * state.hidden_size]).T
for i in range(layers)
]
_, cost, show_cost = generative_stochastic_network.build_gsn_scan(
Xs, weights_list, b_list, True, state.noiseless_h1,
state.hidden_add_noise_sigma, state.input_salt_and_pepper,
state.input_sampling, MRG, visible_activation, hidden_activation,
walkbacks, cost_function, logger)
x_sample_recon, _, _ = generative_stochastic_network.build_gsn_scan(
Xs, weights_list, b_list, False, state.noiseless_h1,
state.hidden_add_noise_sigma, state.input_salt_and_pepper,
state.input_sampling, MRG, visible_activation, hidden_activation,
walkbacks, cost_function, logger)
updates_train = updates_recurrent
#updates_train.update(updates_gsn)
updates_cost = updates_recurrent
#updates_recon = updates_recurrent
#updates_recon.update(updates_gsn_recon)
#############
# COSTS #
#############
logger.log("")
logger.log('Cost w.r.t p(X|...) at every step in the graph')
if train_gsn_first:
gsn_costs = [cost_function(rX, X) for rX in p_X_chain_gsn]
gsn_show_cost = gsn_costs[-1]
gsn_cost = numpy.sum(gsn_costs)
###################################
# GRADIENTS AND FUNCTIONS FOR GSN #
###################################
logger.log(["params:", params])
logger.log("creating functions...")
start_functions_time = time.time()
if train_gsn_first:
gradient_gsn = T.grad(gsn_cost, gsn_params)
gradient_buffer_gsn = [
theano.shared(numpy.zeros(param.get_value().shape,
dtype='float32')) for param in gsn_params
]
m_gradient_gsn = [
momentum * gb + (cast32(1) - momentum) * g
for (gb, g) in zip(gradient_buffer_gsn, gradient_gsn)
]
param_updates_gsn = [(param, param - learning_rate * mg)
for (param, mg) in zip(gsn_params, m_gradient_gsn)
]
gradient_buffer_updates_gsn = zip(gradient_buffer_gsn, m_gradient_gsn)
grad_updates_gsn = OrderedDict(param_updates_gsn +
gradient_buffer_updates_gsn)
logger.log("gsn cost...")
f_cost_gsn = theano.function(inputs=[X],
outputs=gsn_show_cost,
on_unused_input='warn')
logger.log("gsn learn...")
f_learn_gsn = theano.function(inputs=[X],
updates=grad_updates_gsn,
outputs=gsn_show_cost,
on_unused_input='warn')
#######################################
# GRADIENTS AND FUNCTIONS FOR RNN-GSN #
#######################################
# if we are not using Hessian-free training create the normal sgd functions
if state.hessian_free == 0:
gradient = T.grad(cost, params)
gradient_buffer = [
theano.shared(numpy.zeros(param.get_value().shape,
dtype='float32')) for param in params
]
m_gradient = [
momentum * gb + (cast32(1) - momentum) * g
for (gb, g) in zip(gradient_buffer, gradient)
]
param_updates = [(param, param - learning_rate * mg)
for (param, mg) in zip(params, m_gradient)]
gradient_buffer_updates = zip(gradient_buffer, m_gradient)
updates = OrderedDict(param_updates + gradient_buffer_updates)
updates_train.update(updates)
logger.log("rnn-gsn learn...")
f_learn = theano.function(inputs=[Xs],
updates=updates_train,
outputs=show_cost,
on_unused_input='warn')
logger.log("rnn-gsn cost...")
f_cost = theano.function(inputs=[Xs],
updates=updates_cost,
outputs=show_cost,
on_unused_input='warn')
logger.log("Training/cost functions done.")
compilation_time = time.time() - start_functions_time
# Show the compile time with appropriate easy-to-read units.
logger.log("Compilation took " + make_time_units_string(compilation_time) +
".\n\n")
############################################################################################
# Denoise some numbers : show number, noisy number, predicted number, reconstructed number #
############################################################################################
# Recompile the graph without noise for reconstruction function
# The layer update scheme
logger.log(
"Creating graph for noisy reconstruction function at checkpoints during training."
)
f_recon = theano.function(inputs=[Xs], outputs=x_sample_recon[-1])
# Now do the same but for the GSN in the initial run
if train_gsn_first:
f_recon_gsn = theano.function(inputs=[X],
outputs=p_X_chain_gsn_recon[-1])
logger.log("Done compiling all functions.")
compilation_time = time.time() - start_functions_time
# Show the compile time with appropriate easy-to-read units.
logger.log("Total time took " + make_time_units_string(compilation_time) +
".\n\n")
############
# Sampling #
############
# a function to add salt and pepper noise
f_noise = theano.function(inputs=[X],
outputs=salt_and_pepper(
X, state.input_salt_and_pepper))
# the input to the sampling function
X_sample = T.fmatrix("X_sampling")
network_state_input = [X_sample] + [
T.fmatrix("H_sampling_" + str(i + 1)) for i in range(layers)
]
# "Output" state of the network (noisy)
# initialized with input, then we apply updates
network_state_output = [X_sample] + network_state_input[1:]
visible_pX_chain = []
# ONE update
logger.log("Performing one walkback in network state sampling.")
generative_stochastic_network.update_layers(
network_state_output, weights_list, bias_list, visible_pX_chain, True,
state.noiseless_h1, state.hidden_add_noise_sigma,
state.input_salt_and_pepper, state.input_sampling, MRG,
visible_activation, hidden_activation, logger)
if layers == 1:
f_sample_simple = theano.function(inputs=[X_sample],
outputs=visible_pX_chain[-1])
# WHY IS THERE A WARNING????
# because the first odd layers are not used -> directly computed FROM THE EVEN layers
# unused input = warn
f_sample2 = theano.function(inputs=network_state_input,
outputs=network_state_output +
visible_pX_chain,
on_unused_input='warn')
def sample_some_numbers_single_layer():
x0 = test_X.get_value()[:1]
samples = [x0]
x = f_noise(x0)
for i in range(399):
x = f_sample_simple(x)
samples.append(x)
x = numpy.random.binomial(n=1, p=x, size=x.shape).astype('float32')
x = f_noise(x)
return numpy.vstack(samples)
def sampling_wrapper(NSI):
# * is the "splat" operator: It takes a list as input, and expands it into actual positional arguments in the function call.
out = f_sample2(*NSI)
NSO = out[:len(network_state_output)]
vis_pX_chain = out[len(network_state_output):]
return NSO, vis_pX_chain
def sample_some_numbers(N=400):
# The network's initial state
init_vis = test_X.get_value()[:1]
noisy_init_vis = f_noise(init_vis)
network_state = [[noisy_init_vis] + [
numpy.zeros((1, len(b.get_value())), dtype='float32')
for b in bias_list[1:]
]]
visible_chain = [init_vis]
noisy_h0_chain = [noisy_init_vis]
for i in range(N - 1):
# feed the last state into the network, compute new state, and obtain visible units expectation chain
net_state_out, vis_pX_chain = sampling_wrapper(network_state[-1])
# append to the visible chain
visible_chain += vis_pX_chain
# append state output to the network state chain
network_state.append(net_state_out)
noisy_h0_chain.append(net_state_out[0])
return numpy.vstack(visible_chain), numpy.vstack(noisy_h0_chain)
def plot_samples(epoch_number, leading_text):
to_sample = time.time()
if layers == 1:
# one layer model
V = sample_some_numbers_single_layer()
else:
V, H0 = sample_some_numbers()
img_samples = PIL.Image.fromarray(
tile_raster_images(V, (root_N_input, root_N_input), (20, 20)))
fname = outdir + leading_text + 'samples_epoch_' + str(
epoch_number) + '.png'
img_samples.save(fname)
logger.log('Took ' + str(time.time() - to_sample) +
' to sample 400 numbers')
#############################
# Save the model parameters #
#############################
def save_params_to_file(name, n, gsn_params):
pass
# print 'saving parameters...'
# save_path = outdir+name+'_params_epoch_'+str(n)+'.pkl'
# f = open(save_path, 'wb')
# try:
# cPickle.dump(gsn_params, f, protocol=cPickle.HIGHEST_PROTOCOL)
# finally:
# f.close()
def save_params(params):
values = [param.get_value(borrow=True) for param in params]
return values
def restore_params(params, values):
for i in range(len(params)):
params[i].set_value(values[i])
################
# GSN TRAINING #
################
def train_GSN(train_X, train_Y, valid_X, valid_Y, test_X, test_Y):
logger.log("\n-----------TRAINING GSN------------\n")
# TRAINING
n_epoch = state.n_epoch
batch_size = state.gsn_batch_size
STOP = False
counter = 0
learning_rate.set_value(cast32(state.learning_rate)) # learning rate
times = []
best_cost = float('inf')
best_params = None
patience = 0
logger.log(['train X size:', str(train_X.shape.eval())])
logger.log(['valid X size:', str(valid_X.shape.eval())])
logger.log(['test X size:', str(test_X.shape.eval())])
if state.vis_init:
bias_list[0].set_value(
logit(numpy.clip(0.9, 0.001,
train_X.get_value().mean(axis=0))))
if state.test_model:
# If testing, do not train and go directly to generating samples, parzen window estimation, and inpainting
logger.log('Testing : skip training')
STOP = True
while not STOP:
counter += 1
t = time.time()
logger.append([counter, '\t'])
#shuffle the data
data.sequence_mnist_data(train_X, train_Y, valid_X, valid_Y,
test_X, test_Y, dataset, rng)
#train
train_costs = []
for i in xrange(len(train_X.get_value(borrow=True)) / batch_size):
x = train_X.get_value()[i * batch_size:(i + 1) * batch_size]
cost = f_learn_gsn(x)
train_costs.append([cost])
train_costs = numpy.mean(train_costs)
# record it
logger.append(['Train:', trunc(train_costs), '\t'])
with open(gsn_train_convergence, 'a') as f:
f.write("{0!s},".format(train_costs))
f.write("\n")
#valid
valid_costs = []
for i in xrange(len(valid_X.get_value(borrow=True)) / batch_size):
x = valid_X.get_value()[i * batch_size:(i + 1) * batch_size]
cost = f_cost_gsn(x)
valid_costs.append([cost])
valid_costs = numpy.mean(valid_costs)
# record it
logger.append(['Valid:', trunc(valid_costs), '\t'])
with open(gsn_valid_convergence, 'a') as f:
f.write("{0!s},".format(valid_costs))
f.write("\n")
#test
test_costs = []
for i in xrange(len(test_X.get_value(borrow=True)) / batch_size):
x = test_X.get_value()[i * batch_size:(i + 1) * batch_size]
cost = f_cost_gsn(x)
test_costs.append([cost])
test_costs = numpy.mean(test_costs)
# record it
logger.append(['Test:', trunc(test_costs), '\t'])
with open(gsn_test_convergence, 'a') as f:
f.write("{0!s},".format(test_costs))
f.write("\n")
#check for early stopping
cost = numpy.sum(valid_costs)
if cost < best_cost * state.early_stop_threshold:
patience = 0
best_cost = cost
# save the parameters that made it the best
best_params = save_params(gsn_params)
else:
patience += 1
if counter >= n_epoch or patience >= state.early_stop_length:
STOP = True
if best_params is not None:
restore_params(gsn_params, best_params)
save_params_to_file('gsn', counter, gsn_params)
timing = time.time() - t
times.append(timing)
logger.append('time: ' + make_time_units_string(timing) + '\t')
logger.log('remaining: ' +
make_time_units_string((n_epoch - counter) *
numpy.mean(times)))
if (counter % state.save_frequency) == 0 or STOP is True:
n_examples = 100
random_idx = numpy.array(
R.sample(range(len(test_X.get_value(borrow=True))),
n_examples))
numbers = test_X.get_value(borrow=True)[random_idx]
noisy_numbers = f_noise(
test_X.get_value(borrow=True)[random_idx])
reconstructed = f_recon_gsn(noisy_numbers)
# Concatenate stuff
stacked = numpy.vstack([
numpy.vstack([
numbers[i * 10:(i + 1) * 10],
noisy_numbers[i * 10:(i + 1) * 10],
reconstructed[i * 10:(i + 1) * 10]
]) for i in range(10)
])
number_reconstruction = PIL.Image.fromarray(
tile_raster_images(stacked, (root_N_input, root_N_input),
(10, 30)))
number_reconstruction.save(outdir +
'gsn_number_reconstruction_epoch_' +
str(counter) + '.png')
#sample_numbers(counter, 'seven')
plot_samples(counter, 'gsn')
#save gsn_params
save_params_to_file('gsn', counter, gsn_params)
# ANNEAL!
new_lr = learning_rate.get_value() * annealing
learning_rate.set_value(new_lr)
# 10k samples
print 'Generating 10,000 samples'
samples, _ = sample_some_numbers(N=10000)
f_samples = outdir + 'samples.npy'
numpy.save(f_samples, samples)
print 'saved digits'
def train_RNN_GSN(train_X, train_Y, valid_X, valid_Y, test_X, test_Y):
# If we are using Hessian-free training
if state.hessian_free == 1:
pass
# gradient_dataset = hf_sequence_dataset([train_X.get_value()], batch_size=None, number_batches=5000)
# cg_dataset = hf_sequence_dataset([train_X.get_value()], batch_size=None, number_batches=1000)
# valid_dataset = hf_sequence_dataset([valid_X.get_value()], batch_size=None, number_batches=1000)
#
# s = x_samples
# costs = [cost, show_cost]
# hf_optimizer(params, [Xs], s, costs, u, ua).train(gradient_dataset, cg_dataset, initial_lambda=1.0, preconditioner=True, validation=valid_dataset)
# If we are using SGD training
else:
# Define the re-used loops for f_learn and f_cost
def apply_cost_function_to_dataset(function, dataset):
costs = []
for i in xrange(
len(dataset.get_value(borrow=True)) / batch_size):
xs = dataset.get_value(
borrow=True)[i * batch_size:(i + 1) * batch_size]
cost = function(xs)
costs.append([cost])
return numpy.mean(costs)
logger.log("\n-----------TRAINING RNN-GSN------------\n")
# TRAINING
n_epoch = state.n_epoch
batch_size = state.batch_size
STOP = False
counter = 0
learning_rate.set_value(cast32(
state.learning_rate)) # learning rate
times = []
best_cost = float('inf')
best_params = None
patience = 0
logger.log(['train X size:', str(train_X.shape.eval())])
logger.log(['valid X size:', str(valid_X.shape.eval())])
logger.log(['test X size:', str(test_X.shape.eval())])
if state.vis_init:
bias_list[0].set_value(
logit(
numpy.clip(0.9, 0.001,
train_X.get_value().mean(axis=0))))
if state.test_model:
# If testing, do not train and go directly to generating samples, parzen window estimation, and inpainting
logger.log('Testing : skip training')
STOP = True
while not STOP:
counter += 1
t = time.time()
logger.append([counter, '\t'])
#shuffle the data
data.sequence_mnist_data(train_X, train_Y, valid_X, valid_Y,
test_X, test_Y, dataset, rng)
#train
train_costs = apply_cost_function_to_dataset(f_learn, train_X)
# record it
logger.append(['Train:', trunc(train_costs), '\t'])
with open(train_convergence, 'a') as f:
f.write("{0!s},".format(train_costs))
f.write("\n")
#valid
valid_costs = apply_cost_function_to_dataset(f_cost, valid_X)
# record it
logger.append(['Valid:', trunc(valid_costs), '\t'])
with open(valid_convergence, 'a') as f:
f.write("{0!s},".format(valid_costs))
f.write("\n")
#test
test_costs = apply_cost_function_to_dataset(f_cost, test_X)
# record it
logger.append(['Test:', trunc(test_costs), '\t'])
with open(test_convergence, 'a') as f:
f.write("{0!s},".format(test_costs))
f.write("\n")
#check for early stopping
cost = numpy.sum(valid_costs)
if cost < best_cost * state.early_stop_threshold:
patience = 0
best_cost = cost
# save the parameters that made it the best
best_params = save_params(params)
else:
patience += 1
if counter >= n_epoch or patience >= state.early_stop_length:
STOP = True
if best_params is not None:
restore_params(params, best_params)
save_params_to_file('all', counter, params)
timing = time.time() - t
times.append(timing)
logger.append('time: ' + make_time_units_string(timing) + '\t')
logger.log('remaining: ' +
make_time_units_string((n_epoch - counter) *
numpy.mean(times)))
if (counter % state.save_frequency) == 0 or STOP is True:
n_examples = 100
nums = test_X.get_value(borrow=True)[range(n_examples)]
noisy_nums = f_noise(
test_X.get_value(borrow=True)[range(n_examples)])
reconstructions = []
for i in xrange(0, len(noisy_nums)):
recon = f_recon(noisy_nums[max(0, (i + 1) -
batch_size):i + 1])
reconstructions.append(recon)
reconstructed = numpy.array(reconstructions)
# Concatenate stuff
stacked = numpy.vstack([
numpy.vstack([
nums[i * 10:(i + 1) * 10],
noisy_nums[i * 10:(i + 1) * 10],
reconstructed[i * 10:(i + 1) * 10]
]) for i in range(10)
])
number_reconstruction = PIL.Image.fromarray(
tile_raster_images(stacked,
(root_N_input, root_N_input),
(10, 30)))
number_reconstruction.save(
outdir + 'rnngsn_number_reconstruction_epoch_' +
str(counter) + '.png')
#sample_numbers(counter, 'seven')
plot_samples(counter, 'rnngsn')
#save params
save_params_to_file('all', counter, params)
# ANNEAL!
new_lr = learning_rate.get_value() * annealing
learning_rate.set_value(new_lr)
# 10k samples
print 'Generating 10,000 samples'
samples, _ = sample_some_numbers(N=10000)
f_samples = outdir + 'samples.npy'
numpy.save(f_samples, samples)
print 'saved digits'
#####################
# STORY 2 ALGORITHM #
#####################
# train the GSN parameters first to get a good baseline (if not loaded from parameter .pkl file)
if train_gsn_first:
train_GSN(train_X, train_Y, valid_X, valid_Y, test_X, test_Y)
# train the entire RNN-GSN
train_RNN_GSN(train_X, train_Y, valid_X, valid_Y, test_X, test_Y)
def train_regression(iteration, train_X, train_Y, valid_X, valid_Y, test_X, test_Y):
print '-------------------------------------------'
print 'TRAINING RECURRENT REGRESSION FOR ITERATION',iteration
with open(logfile,'a') as f:
f.write("--------------------------\nTRAINING RECURRENT REGRESSION FOR ITERATION {0!s}\n".format(iteration))
# TRAINING
# TRAINING
n_epoch = state.n_epoch
batch_size = state.batch_size
STOP = False
counter = 0
if iteration == 0:
recurrent_learning_rate.set_value(cast32(state.learning_rate)) # learning rate
times = []
best_cost = float('inf')
patience = 0
print 'learning rate:',recurrent_learning_rate.get_value()
print 'train X size:',str(train_X.shape.eval())
print 'valid X size:',str(valid_X.shape.eval())
print 'test X size:',str(test_X.shape.eval())
train_costs = []
valid_costs = []
test_costs = []
if state.vis_init:
bias_list[0].set_value(logit(numpy.clip(0.9,0.001,train_X.get_value().mean(axis=0))))
if state.test_model:
# If testing, do not train and go directly to generating samples, parzen window estimation, and inpainting
print 'Testing : skip training'
STOP = True
while not STOP:
counter += 1
t = time.time()
print counter,'\t',
#shuffle the data
data.sequence_mnist_data(train_X, train_Y, valid_X, valid_Y, test_X, test_Y, dataset, rng)
#train
#init recurrent hiddens as zero
recurrent_hiddens = [T.zeros((batch_size,recurrent_layer_size)).eval() for recurrent_layer_size in recurrent_layer_sizes]
train_cost = []
for i in range(len(train_X.get_value(borrow=True)) / batch_size):
x = train_X.get_value()[i * batch_size : (i+1) * batch_size]
x1 = train_X.get_value()[(i * batch_size) + 1 : ((i+1) * batch_size) + 1]
[x,x1], recurrent_hiddens = fix_input_size([x,x1], recurrent_hiddens)
_ins = recurrent_hiddens + [x,x1]
_outs = recurrent_f_learn(*_ins)
recurrent_hiddens = _outs[:len(recurrent_hiddens)]
cost = _outs[-1]
train_cost.append(cost)
train_cost = numpy.mean(train_cost)
train_costs.append(train_cost)
print 'rTrain : ',trunc(train_cost), '\t',
with open(logfile,'a') as f:
f.write("rTrain : {0!s}\t".format(trunc(train_cost)))
with open(recurrent_train_convergence,'a') as f:
f.write("{0!s},".format(train_cost))
#valid
#init recurrent hiddens as zero
recurrent_hiddens = [T.zeros((batch_size,recurrent_layer_size)).eval() for recurrent_layer_size in recurrent_layer_sizes]
valid_cost = []
for i in range(len(valid_X.get_value(borrow=True)) / batch_size):
x = valid_X.get_value()[i * batch_size : (i+1) * batch_size]
x1 = valid_X.get_value()[(i * batch_size) + 1 : ((i+1) * batch_size) + 1]
[x,x1], recurrent_hiddens = fix_input_size([x,x1], recurrent_hiddens)
_ins = recurrent_hiddens + [x,x1]
_outs = f_cost(*_ins)
recurrent_hiddens = _outs[:len(recurrent_hiddens)]
cost = _outs[-1]
valid_cost.append(cost)
valid_cost = numpy.mean(valid_cost)
valid_costs.append(valid_cost)
print 'rValid : ', trunc(valid_cost), '\t',
with open(logfile,'a') as f:
f.write("rValid : {0!s}\t".format(trunc(valid_cost)))
with open(recurrent_valid_convergence,'a') as f:
f.write("{0!s},".format(valid_cost))
#test
recurrent_hiddens = [T.zeros((batch_size,recurrent_layer_size)).eval() for recurrent_layer_size in recurrent_layer_sizes]
test_cost = []
for i in range(len(test_X.get_value(borrow=True)) / batch_size):
x = test_X.get_value()[i * batch_size : (i+1) * batch_size]
x1 = test_X.get_value()[(i * batch_size) + 1 : ((i+1) * batch_size) + 1]
[x,x1], recurrent_hiddens = fix_input_size([x,x1], recurrent_hiddens)
_ins = recurrent_hiddens + [x,x1]
_outs = f_cost(*_ins)
recurrent_hiddens = _outs[:len(recurrent_hiddens)]
cost = _outs[-1]
test_cost.append(cost)
test_cost = numpy.mean(test_cost)
test_costs.append(test_cost)
print 'rTest : ', trunc(test_cost), '\t',
with open(logfile,'a') as f:
f.write("rTest : {0!s}\t".format(trunc(test_cost)))
with open(recurrent_test_convergence,'a') as f:
f.write("{0!s},".format(test_cost))
#check for early stopping
cost = train_cost
if iteration != 0:
cost = cost + train_cost
if cost < best_cost*state.early_stop_threshold:
patience = 0
best_cost = cost
else:
patience += 1
timing = time.time() - t
times.append(timing)
print 'time : ', trunc(timing),
print 'remaining: ', trunc((n_epoch - counter) * numpy.mean(times) / 60 / 60), 'hrs'
with open(logfile,'a') as f:
f.write("B : {0!s}\t".format(str([trunc(vb.get_value().mean()) for vb in recurrent_bias_list])))
with open(logfile,'a') as f:
f.write("W : {0!s}\t".format(str([trunc(abs(v.get_value(borrow=True)).mean()) for v in recurrent_weights_list_encode])))
with open(logfile,'a') as f:
f.write("V : {0!s}\t".format(str([trunc(abs(v.get_value(borrow=True)).mean()) for v in recurrent_weights_list_decode])))
with open(logfile,'a') as f:
f.write("Time : {0!s} seconds\n".format(trunc(timing)))
if (counter % state.save_frequency) == 0:
# Checking reconstruction
nums = test_X.get_value()[range(100)]
noisy_nums = f_noise(test_X.get_value()[range(100)])
reconstructed = []
reconstructed_prediction = []
#init recurrent hiddens as zero
recurrent_hiddens = [T.zeros((batch_size,recurrent_layer_size)).eval() for recurrent_layer_size in recurrent_layer_sizes]
for num in noisy_nums:
_ins = recurrent_hiddens + [num]
_outs = f_recon(*_ins)
recurrent_hiddens = _outs[:len(recurrent_hiddens)]
[recon,recon_pred] = _outs[len(recurrent_hiddens):]
reconstructed.append(recon)
reconstructed_prediction.append(recon_pred)
# Concatenate stuff
stacked = numpy.vstack([numpy.vstack([nums[i*10 : (i+1)*10], noisy_nums[i*10 : (i+1)*10], reconstructed[i*10 : (i+1)*10], reconstructed_prediction[i*10 : (i+1)*10]]) for i in range(10)])
number_reconstruction = PIL.Image.fromarray(tile_raster_images(stacked, (root_N_input,root_N_input), (10,40)))
#epoch_number = reduce(lambda x,y : x + y, ['_'] * (4-len(str(counter)))) + str(counter)
number_reconstruction.save(outdir+'recurrent_number_reconstruction_iteration_'+str(iteration)+'_epoch_'+str(counter)+'.png')
#sample_numbers(counter, 'seven')
plot_samples(counter, iteration)
#save params
save_params_to_file('recurrent', counter, params, iteration)
# ANNEAL!
new_r_lr = recurrent_learning_rate.get_value() * annealing
recurrent_learning_rate.set_value(new_r_lr)
# if test
# 10k samples
print 'Generating 10,000 samples'
samples, _ = sample_some_numbers(N=10000)
f_samples = outdir+'samples.npy'
numpy.save(f_samples, samples)
print 'saved digits'
def experiment(state, outdir_base='./'):
rng.seed(1) #seed the numpy random generator
# create the output directories and log/result files
data.mkdir_p(outdir_base)
outdir = outdir_base + "/" + state.dataset + "/"
data.mkdir_p(outdir)
logfile = outdir+"log.txt"
with open(logfile,'w') as f:
f.write("MODEL 3, {0!s}\n\n".format(state.dataset))
train_convergence_pre = outdir+"train_convergence_pre.csv"
train_convergence_post = outdir+"train_convergence_post.csv"
valid_convergence_pre = outdir+"valid_convergence_pre.csv"
valid_convergence_post = outdir+"valid_convergence_post.csv"
test_convergence_pre = outdir+"test_convergence_pre.csv"
test_convergence_post = outdir+"test_convergence_post.csv"
recurrent_train_convergence = outdir+"recurrent_train_convergence.csv"
recurrent_valid_convergence = outdir+"recurrent_valid_convergence.csv"
recurrent_test_convergence = outdir+"recurrent_test_convergence.csv"
print
print "----------MODEL 3--------------"
print
#load parameters from config file if this is a test
config_filename = outdir+'config'
if state.test_model and 'config' in os.listdir(outdir):
config_vals = load_from_config(config_filename)
for CV in config_vals:
print CV
if CV.startswith('test'):
print 'Do not override testing switch'
continue
try:
exec('state.'+CV) in globals(), locals()
except:
exec('state.'+CV.split('=')[0]+"='"+CV.split('=')[1]+"'") in globals(), locals()
else:
# Save the current configuration
# Useful for logs/experiments
print 'Saving config'
with open(config_filename, 'w') as f:
f.write(str(state))
print state
# Load the data
artificial = False #flag for using my artificially-sequenced mnist datasets
if state.dataset == 'MNIST_1' or state.dataset == 'MNIST_2' or state.dataset == 'MNIST_3':
(train_X, train_Y), (valid_X, valid_Y), (test_X, test_Y) = data.load_mnist(state.data_path)
train_X = numpy.concatenate((train_X, valid_X))
train_Y = numpy.concatenate((train_Y, valid_Y))
artificial = True
try:
dataset = int(state.dataset.split('_')[1])
except:
raise AssertionError("artificial dataset number not recognized. Input was "+state.dataset)
else:
raise AssertionError("dataset not recognized.")
#make shared variables for better use of the gpu
train_X = theano.shared(train_X)
train_Y = theano.shared(train_Y)
valid_X = theano.shared(valid_X)
valid_Y = theano.shared(valid_Y)
test_X = theano.shared(test_X)
test_Y = theano.shared(test_Y)
if artificial: #run the appropriate artificial sequencing of mnist data
print 'Sequencing MNIST data...'
print 'train set size:',len(train_Y.eval())
print 'valid set size:',len(valid_Y.eval())
print 'test set size:',len(test_Y.eval())
data.sequence_mnist_data(train_X, train_Y, valid_X, valid_Y, test_X, test_Y, dataset, rng)
print 'train set size:',len(train_Y.eval())
print 'valid set size:',len(valid_Y.eval())
print 'test set size:',len(test_Y.eval())
print 'Sequencing done.'
print
N_input = train_X.eval().shape[1]
root_N_input = numpy.sqrt(N_input)
# Theano variables and RNG
X = T.fmatrix("X")
X1 = T.fmatrix("X1")
H = T.fmatrix("Hrecurr_visible")
MRG = RNG_MRG.MRG_RandomStreams(1)
# Network and training specifications
layers = state.layers # number hidden layers
walkbacks = state.walkbacks # number of walkbacks
recurrent_layers = state.recurrent_layers # number recurrent hidden layers
recurrent_walkbacks = state.recurrent_walkbacks # number of recurrent walkbacks
layer_sizes = [N_input] + [state.hidden_size] * layers # layer sizes, from h0 to hK (h0 is the visible layer)
print 'layer_sizes:', layer_sizes
recurrent_layer_sizes = [state.hidden_size*numpy.ceil(layers/2.0)] + [state.recurrent_hidden_size] * recurrent_layers
print 'recurrent_sizes',recurrent_layer_sizes
learning_rate = theano.shared(cast32(state.learning_rate)) # learning rate
recurrent_learning_rate = theano.shared(cast32(state.learning_rate)) # learning rate
annealing = cast32(state.annealing) # exponential annealing coefficient
momentum = theano.shared(cast32(state.momentum)) # momentum term
recurrent_hiddens_input = [H] + [T.fmatrix(name="hrecurr_"+str(i+1)) for i in range(recurrent_layers)]
recurrent_hiddens_output = recurrent_hiddens_input[:1] + recurrent_hiddens_input[1:]
# PARAMETERS : weights list and bias list.
# initialize a list of weights and biases based on layer_sizes: these are theta_gsn parameters
weights_list = [get_shared_weights(layer_sizes[i], layer_sizes[i+1], name="W_{0!s}_{1!s}".format(i,i+1)) for i in range(layers)] # initialize each layer to uniform sample from sqrt(6. / (n_in + n_out))
bias_list = [get_shared_bias(layer_sizes[i], name='b_'+str(i)) for i in range(layers + 1)] # initialize each layer to 0's.
# parameters for recurrent part
#recurrent weights initial visible layer is the even layers of the network below it: these are theta_transition parameters
recurrent_weights_list_encode = [get_shared_weights(recurrent_layer_sizes[i], recurrent_layer_sizes[i+1], name="U_{0!s}_{1!s}".format(i,i+1)) for i in range(recurrent_layers)] #untied weights in the recurrent layers
recurrent_weights_list_decode = [get_shared_weights(recurrent_layer_sizes[i+1], recurrent_layer_sizes[i], name="V_{0!s}_{1!s}".format(i+1,i)) for i in range(recurrent_layers)]
recurrent_bias_list = [get_shared_bias(recurrent_layer_sizes[i], name='vb_'+str(i)) for i in range(recurrent_layers+1)] # initialize to 0's.
''' F PROP '''
if state.act == 'sigmoid':
print 'Using sigmoid activation'
hidden_activation = T.nnet.sigmoid
elif state.act == 'rectifier':
print 'Using rectifier activation'
hidden_activation = lambda x : T.maximum(cast32(0), x)
elif state.act == 'tanh':
print 'Using tanh activation'
hidden_activation = lambda x : T.tanh(x)
print 'Using sigmoid activation for visible layer'
visible_activation = T.nnet.sigmoid
def update_layers(hiddens, p_X_chain, noisy = True):
print 'odd layer updates'
update_odd_layers(hiddens, noisy)
print 'even layer updates'
update_even_layers(hiddens, p_X_chain, noisy)
print 'done full update.'
print
def update_layers_reverse_order(hiddens, p_X_chain, noisy = True):
print 'even layer updates'
update_even_layers(hiddens, p_X_chain, noisy)
print 'odd layer updates'
update_odd_layers(hiddens, noisy)
print 'done full update.'
print
# Odd layer update function
# just a loop over the odd layers
def update_odd_layers(hiddens, noisy):
for i in range(1, len(hiddens), 2):
print 'updating layer',i
simple_update_layer(hiddens, None, i, add_noise = noisy)
# Even layer update
# p_X_chain is given to append the p(X|...) at each full update (one update = odd update + even update)
def update_even_layers(hiddens, p_X_chain, noisy):
for i in range(0, len(hiddens), 2):
print 'updating layer',i
simple_update_layer(hiddens, p_X_chain, i, add_noise = noisy)
# The layer update function
# hiddens : list containing the symbolic theano variables [visible, hidden1, hidden2, ...]
# layer_update will modify this list inplace
# p_X_chain : list containing the successive p(X|...) at each update
# update_layer will append to this list
# add_noise : pre and post activation gaussian noise
def simple_update_layer(hiddens, p_X_chain, i, add_noise=True):
# Compute the dot product, whatever layer
# If the visible layer X
if i == 0:
print 'using '+str(weights_list[i])+'.T'
hiddens[i] = T.dot(hiddens[i+1], weights_list[i].T) + bias_list[i]
# If the top layer
elif i == len(hiddens)-1:
print 'using',weights_list[i-1]
hiddens[i] = T.dot(hiddens[i-1], weights_list[i-1]) + bias_list[i]
# Otherwise in-between layers
else:
print "using {0!s} and {1!s}.T".format(weights_list[i-1], weights_list[i])
# next layer : hiddens[i+1], assigned weights : W_i
# previous layer : hiddens[i-1], assigned weights : W_(i-1)
hiddens[i] = T.dot(hiddens[i+1], weights_list[i].T) + T.dot(hiddens[i-1], weights_list[i-1]) + bias_list[i]
# Add pre-activation noise if NOT input layer
if i==1 and state.noiseless_h1:
print '>>NO noise in first hidden layer'
add_noise = False
# pre activation noise
if i != 0 and add_noise:
print 'Adding pre-activation gaussian noise for layer', i
hiddens[i] = add_gaussian_noise(hiddens[i], state.hidden_add_noise_sigma)
# ACTIVATION!
if i == 0:
print 'Sigmoid units activation for visible layer X'
hiddens[i] = visible_activation(hiddens[i])
else:
print 'Hidden units {} activation for layer'.format(state.act), i
hiddens[i] = hidden_activation(hiddens[i])
# post activation noise
# why is there post activation noise? Because there is already pre-activation noise, this just doubles the amount of noise between each activation of the hiddens.
# if i != 0 and add_noise:
# print 'Adding post-activation gaussian noise for layer', i
# hiddens[i] = add_gaussian(hiddens[i], state.hidden_add_noise_sigma)
# build the reconstruction chain if updating the visible layer X
if i == 0:
# if input layer -> append p(X|...)
p_X_chain.append(hiddens[i])
# sample from p(X|...) - SAMPLING NEEDS TO BE CORRECT FOR INPUT TYPES I.E. FOR BINARY MNIST SAMPLING IS BINOMIAL. real-valued inputs should be gaussian
if state.input_sampling:
print 'Sampling from input'
sampled = sample_visibles(hiddens[i])
else:
print '>>NO input sampling'
sampled = hiddens[i]
# add noise
sampled = salt_and_pepper(sampled, state.input_salt_and_pepper)
# set input layer
hiddens[i] = sampled
def update_recurrent_layers(hiddens, p_X_chain, noisy = True):
print 'odd layer updates'
update_odd_recurrent_layers(hiddens, noisy)
print 'even layer updates'
update_even_recurrent_layers(hiddens, p_X_chain, noisy)
print 'done full update.'
print
# Odd layer update function
# just a loop over the odd layers
def update_odd_recurrent_layers(hiddens, noisy):
for i in range(1, len(hiddens), 2):
print 'updating layer',i
simple_update_recurrent_layer(hiddens, None, i, add_noise = noisy)
# Even layer update
# p_X_chain is given to append the p(X|...) at each full update (one update = odd update + even update)
def update_even_recurrent_layers(hiddens, p_X_chain, noisy):
for i in range(0, len(hiddens), 2):
print 'updating layer',i
simple_update_recurrent_layer(hiddens, p_X_chain, i, add_noise = noisy)
# The layer update function
# hiddens : list containing the symbolic theano variables [visible, hidden1, hidden2, ...]
# layer_update will modify this list inplace
# p_X_chain : list containing the successive p(X|...) at each update
# update_layer will append to this list
# add_noise : pre and post activation gaussian noise
def simple_update_recurrent_layer(hiddens, p_X_chain, i, add_noise=True):
# Compute the dot product, whatever layer
# If the visible layer X
if i == 0:
print 'using '+str(recurrent_weights_list_decode[i])
hiddens[i] = T.dot(hiddens[i+1], recurrent_weights_list_decode[i]) + recurrent_bias_list[i]
# If the top layer
elif i == len(hiddens)-1:
print 'using',recurrent_weights_list_encode[i-1]
hiddens[i] = T.dot(hiddens[i-1], recurrent_weights_list_encode[i-1]) + recurrent_bias_list[i]
# Otherwise in-between layers
else:
print "using {0!s} and {1!s}".format(recurrent_weights_list_encode[i-1], recurrent_weights_list_decode[i])
# next layer : hiddens[i+1], assigned weights : W_i
# previous layer : hiddens[i-1], assigned weights : W_(i-1)
hiddens[i] = T.dot(hiddens[i+1], recurrent_weights_list_decode[i]) + T.dot(hiddens[i-1], recurrent_weights_list_encode[i-1]) + recurrent_bias_list[i]
# Add pre-activation noise if NOT input layer
if i==1 and state.noiseless_h1:
print '>>NO noise in first hidden layer'
add_noise = False
# pre activation noise
if i != 0 and add_noise:
print 'Adding pre-activation gaussian noise for layer', i
hiddens[i] = add_gaussian_noise(hiddens[i], state.hidden_add_noise_sigma)
# ACTIVATION!
print 'Recurrent hidden units {} activation for layer'.format(state.act), i
hiddens[i] = hidden_activation(hiddens[i])
# post activation noise
# why is there post activation noise? Because there is already pre-activation noise, this just doubles the amount of noise between each activation of the hiddens.
# if i != 0 and add_noise:
# print 'Adding post-activation gaussian noise for layer', i
# hiddens[i] = add_gaussian(hiddens[i], state.hidden_add_noise_sigma)
# build the reconstruction chain if updating the visible layer X
if i == 0:
# if input layer -> append p(X|...)
p_X_chain.append(hiddens[i])
# sample from p(X|...) - SAMPLING NEEDS TO BE CORRECT FOR INPUT TYPES I.E. FOR BINARY MNIST SAMPLING IS BINOMIAL. real-valued inputs should be gaussian
if state.input_sampling:
print 'Sampling from input'
sampled = sample_hiddens(hiddens[i])
else:
print '>>NO input sampling'
sampled = hiddens[i]
# add noise
sampled = salt_and_pepper(sampled, state.input_salt_and_pepper)
# set input layer
hiddens[i] = sampled
def sample_hiddens(hiddens):
return MRG.multinomial(pvals = hiddens, dtype='float32')
def sample_visibles(visibles):
return MRG.binomial(p = visibles, size=visibles.shape, dtype='float32')
def build_gsn(hiddens, p_X_chain, noiseflag):
print "Building the gsn graph :", walkbacks,"updates"
for i in range(walkbacks):
print "Walkback {!s}/{!s}".format(i+1,walkbacks)
update_layers(hiddens, p_X_chain, noisy=noiseflag)
def build_gsn_reverse(hiddens, p_X_chain, noiseflag):
print "Building the gsn graph reverse layer update order:", walkbacks,"updates"
for i in range(walkbacks):
print "Walkback {!s}/{!s}".format(i+1,walkbacks)
update_layers_reverse_order(hiddens, p_X_chain, noisy=noiseflag)
def build_recurrent_gsn(recurrent_hiddens, p_H_chain, noiseflag):
#recurrent_hiddens is a list that will be appended to for each of the walkbacks. Used because I need the immediate next set of hidden states to carry through when using the functions - trying not to break the sequences.
print "Building the recurrent gsn graph :", recurrent_walkbacks,"updates"
for i in range(recurrent_walkbacks):
print "Recurrent walkback {!s}/{!s}".format(i+1,recurrent_walkbacks)
update_recurrent_layers(recurrent_hiddens, p_H_chain, noisy=noiseflag)
def build_graph(hiddens, recurrent_hiddens, noiseflag, prediction_index=0):
p_X_chain = []
recurrent_hiddens = []
p_H_chain = []
p_X1_chain = []
# The layer update scheme
print "Building the model graph :", walkbacks*2 + recurrent_walkbacks,"updates"
# First, build the GSN for the given input.
build_gsn(hiddens, p_X_chain, noiseflag)
# Next, use the recurrent GSN to predict future hidden states
# the recurrent hiddens base layer only consists of the odd layers from the gsn - this is because the gsn is constructed by half its layers every time
recurrent_hiddens[0] = T.concatenate([hiddens[i] for i in range(1,len(hiddens),2)], axis=1)
if noiseflag:
recurrent_hiddens[0] = salt_and_pepper(recurrent_hiddens[0], state.input_salt_and_pepper)
# Build the recurrent gsn predicting the next hidden states of future input gsn's
build_recurrent_gsn(recurrent_hiddens, p_H_chain, noiseflag)
#for every next predicted hidden states H, restore the odd layers of the hiddens from what they were predicted to be by the recurrent gsn
for predicted_H in p_H_chain:
index_accumulator = 0
for i in range(1,len(hiddens),2):
hiddens[i] = p_H_chain[prediction_index][:, index_accumulator:index_accumulator + layer_sizes[i]]
index_accumulator += layer_sizes[i]
build_gsn_reverse(hiddens, p_X1_chain, noiseflag)
return hiddens, recurrent_hiddens, p_X_chain, p_H_chain, p_X1_chain
''' Corrupt X '''
X_corrupt = salt_and_pepper(X, state.input_salt_and_pepper)
''' hidden layer init '''
hiddens = [X_corrupt]
print "Hidden units initialization"
for w in weights_list:
# init with zeros
print "Init hidden units at zero before creating the graph"
print
hiddens.append(T.zeros_like(T.dot(hiddens[-1], w)))
hiddens, recurrent_hiddens_output, p_X_chain, p_H_chain, p_X1_chain = build_graph(hiddens, recurrent_hiddens_output, noiseflag=True)
# COST AND GRADIENTS
print
print 'Cost w.r.t p(X|...) at every step in the graph'
COSTS_pre = [T.mean(T.nnet.binary_crossentropy(rX, X)) for rX in p_X_chain]
show_COST_pre = COSTS_pre[-1]
COST_pre = numpy.sum(COSTS_pre)
COSTS_post = [T.mean(T.nnet.binary_crossentropy(rX1, X1)) for rX1 in p_X1_chain]
show_COST_post = COSTS_post[-1]
COST_post = numpy.sum(COSTS_post)
COSTS = COSTS_pre + COSTS_post
COST = numpy.sum(COSTS)
params = weights_list + bias_list
print "params:",params
recurrent_params = recurrent_weights_list_encode + recurrent_weights_list_decode + recurrent_bias_list
print "recurrent params:", recurrent_params
print "creating functions..."
gradient_init = T.grad(COST_pre, params)
gradient_buffer_init = [theano.shared(numpy.zeros(param.get_value().shape, dtype='float32')) for param in params]
m_gradient_init = [momentum * gb + (cast32(1) - momentum) * g for (gb, g) in zip(gradient_buffer_init, gradient_init)]
param_updates_init = [(param, param - learning_rate * mg) for (param, mg) in zip(params, m_gradient_init)]
gradient_buffer_updates_init = zip(gradient_buffer_init, m_gradient_init)
updates_init = OrderedDict(param_updates_init + gradient_buffer_updates_init)
gradient = T.grad(COST, params)
gradient_buffer = [theano.shared(numpy.zeros(param.get_value().shape, dtype='float32')) for param in params]
m_gradient = [momentum * gb + (cast32(1) - momentum) * g for (gb, g) in zip(gradient_buffer, gradient)]
param_updates = [(param, param - learning_rate * mg) for (param, mg) in zip(params, m_gradient)]
gradient_buffer_updates = zip(gradient_buffer, m_gradient)
updates = OrderedDict(param_updates + gradient_buffer_updates)
f_cost = theano.function(inputs = recurrent_hiddens_input + [X, X1],
outputs = recurrent_hiddens_output + [show_COST_pre, show_COST_post],
on_unused_input='warn')
f_learn = theano.function(inputs = recurrent_hiddens_input + [X, X1],
updates = updates,
outputs = recurrent_hiddens_output + [show_COST_pre, show_COST_post],
on_unused_input='warn')
f_learn_init = theano.function(inputs = [X],
updates = updates_init,
outputs = [show_COST_pre],
on_unused_input='warn')
recurrent_gradient = T.grad(COST_post, recurrent_params)
recurrent_gradient_buffer = [theano.shared(numpy.zeros(param.get_value().shape, dtype='float32')) for param in recurrent_params]
recurrent_m_gradient = [momentum * gb + (cast32(1) - momentum) * g for (gb, g) in zip(recurrent_gradient_buffer, recurrent_gradient)]
recurrent_param_updates = [(param, param - recurrent_learning_rate * mg) for (param, mg) in zip(recurrent_params, recurrent_m_gradient)]
recurrent_gradient_buffer_updates = zip(recurrent_gradient_buffer, recurrent_m_gradient)
recurrent_updates = OrderedDict(recurrent_param_updates + recurrent_gradient_buffer_updates)
recurrent_f_learn = theano.function(inputs = recurrent_hiddens_input + [X,X1],
updates = recurrent_updates,
outputs = recurrent_hiddens_output + [show_COST_post],
on_unused_input='warn')
print "functions done."
print
#############
# Denoise some numbers : show number, noisy number, reconstructed number
#############
import random as R
R.seed(1)
# Grab 100 random indices from test_X
random_idx = numpy.array(R.sample(range(len(test_X.get_value())), 100))
numbers = test_X.get_value()[random_idx]
f_noise = theano.function(inputs = [X], outputs = salt_and_pepper(X, state.input_salt_and_pepper))
noisy_numbers = f_noise(test_X.get_value()[random_idx])
#noisy_numbers = salt_and_pepper(numbers, state.input_salt_and_pepper)
# Recompile the graph without noise for reconstruction function
X_recon = T.fvector("X_recon")
hiddens_R = [X_recon]
hiddens_R_input = [T.fvector(name="h_recon_visible")] + [T.fvector(name="h_recon_"+str(i+1)) for i in range(layers)]
hiddens_R_output = hiddens_R_input[:1] + hiddens_R_input[1:]
for w in weights_list:
hiddens_R.append(T.zeros_like(T.dot(hiddens_R[-1], w)))
# The layer update scheme
print "Creating graph for noisy reconstruction function at checkpoints during training."
hiddens_R, recurrent_hiddens_output, p_X_chain_R, p_H_chain_R, p_X1_chain_R = build_graph(hiddens_R, hiddens_R_output, noiseflag=False)
f_recon = theano.function(inputs = hiddens_R_input+[X_recon],
outputs = hiddens_R_output+[p_X_chain_R[-1] ,p_X1_chain_R[-1]],
on_unused_input="warn")
############
# Sampling #
############
# the input to the sampling function
network_state_input = [X] + [T.fmatrix() for i in range(layers)]
# "Output" state of the network (noisy)
# initialized with input, then we apply updates
#network_state_output = network_state_input
network_state_output = [X] + network_state_input[1:]
visible_pX_chain = []
# ONE update
print "Performing one walkback in network state sampling."
update_layers(network_state_output, visible_pX_chain, noisy=True)
if layers == 1:
f_sample_simple = theano.function(inputs = [X], outputs = visible_pX_chain[-1])
# WHY IS THERE A WARNING????
# because the first odd layers are not used -> directly computed FROM THE EVEN layers
# unused input = warn
f_sample2 = theano.function(inputs = network_state_input, outputs = network_state_output + visible_pX_chain, on_unused_input='warn')
def sample_some_numbers_single_layer():
x0 = test_X.get_value()[:1]
samples = [x0]
x = f_noise(x0)
for i in range(399):
x = f_sample_simple(x)
samples.append(x)
x = numpy.random.binomial(n=1, p=x, size=x.shape).astype('float32')
x = f_noise(x)
return numpy.vstack(samples)
def sampling_wrapper(NSI):
# * is the "splat" operator: It takes a list as input, and expands it into actual positional arguments in the function call.
out = f_sample2(*NSI)
NSO = out[:len(network_state_output)]
vis_pX_chain = out[len(network_state_output):]
return NSO, vis_pX_chain
def sample_some_numbers(N=400):
# The network's initial state
init_vis = test_X.get_value()[:1]
noisy_init_vis = f_noise(init_vis)
network_state = [[noisy_init_vis] + [numpy.zeros((1,len(b.get_value())), dtype='float32') for b in bias_list[1:]]]
visible_chain = [init_vis]
noisy_h0_chain = [noisy_init_vis]
for i in range(N-1):
# feed the last state into the network, compute new state, and obtain visible units expectation chain
net_state_out, vis_pX_chain = sampling_wrapper(network_state[-1])
# append to the visible chain
visible_chain += vis_pX_chain
# append state output to the network state chain
network_state.append(net_state_out)
noisy_h0_chain.append(net_state_out[0])
return numpy.vstack(visible_chain), numpy.vstack(noisy_h0_chain)
def plot_samples(epoch_number, iteration):
to_sample = time.time()
if layers == 1:
# one layer model
V = sample_some_numbers_single_layer()
else:
V, H0 = sample_some_numbers()
img_samples = PIL.Image.fromarray(tile_raster_images(V, (root_N_input,root_N_input), (20,20)))
fname = outdir+'samples_iteration_'+str(iteration)+'_epoch_'+str(epoch_number)+'.png'
img_samples.save(fname)
print 'Took ' + str(time.time() - to_sample) + ' to sample 400 numbers'
##############
# Inpainting #
##############
def inpainting(digit):
# The network's initial state
# NOISE INIT
init_vis = cast32(numpy.random.uniform(size=digit.shape))
#noisy_init_vis = f_noise(init_vis)
#noisy_init_vis = cast32(numpy.random.uniform(size=init_vis.shape))
# INDEXES FOR VISIBLE AND NOISY PART
noise_idx = (numpy.arange(N_input) % root_N_input < (root_N_input/2))
fixed_idx = (numpy.arange(N_input) % root_N_input > (root_N_input/2))
# function to re-init the visible to the same noise
# FUNCTION TO RESET HALF VISIBLE TO DIGIT
def reset_vis(V):
V[0][fixed_idx] = digit[0][fixed_idx]
return V
# INIT DIGIT : NOISE and RESET HALF TO DIGIT
init_vis = reset_vis(init_vis)
network_state = [[init_vis] + [numpy.zeros((1,len(b.get_value())), dtype='float32') for b in bias_list[1:]]]
visible_chain = [init_vis]
noisy_h0_chain = [init_vis]
for i in range(49):
# feed the last state into the network, compute new state, and obtain visible units expectation chain
net_state_out, vis_pX_chain = sampling_wrapper(network_state[-1])
# reset half the digit
net_state_out[0] = reset_vis(net_state_out[0])
vis_pX_chain[0] = reset_vis(vis_pX_chain[0])
# append to the visible chain
visible_chain += vis_pX_chain
# append state output to the network state chain
network_state.append(net_state_out)
noisy_h0_chain.append(net_state_out[0])
return numpy.vstack(visible_chain), numpy.vstack(noisy_h0_chain)
def save_params_to_file(name, n, params, iteration):
print 'saving parameters...'
save_path = outdir+name+'_params_iteration_'+str(iteration)+'_epoch_'+str(n)+'.pkl'
f = open(save_path, 'wb')
try:
cPickle.dump(params, f, protocol=cPickle.HIGHEST_PROTOCOL)
finally:
f.close()
################
# GSN TRAINING #
################
def train_GSN(iteration, train_X, train_Y, valid_X, valid_Y, test_X, test_Y):
print '----------------------------------------'
print 'TRAINING GSN FOR ITERATION',iteration
with open(logfile,'a') as f:
f.write("--------------------------\nTRAINING GSN FOR ITERATION {0!s}\n".format(iteration))
# TRAINING
n_epoch = state.n_epoch
batch_size = state.batch_size
STOP = False
counter = 0
if iteration == 0:
learning_rate.set_value(cast32(state.learning_rate)) # learning rate
times = []
best_cost = float('inf')
patience = 0
print 'learning rate:',learning_rate.get_value()
print 'train X size:',str(train_X.shape.eval())
print 'valid X size:',str(valid_X.shape.eval())
print 'test X size:',str(test_X.shape.eval())
pre_train_costs = []
pre_valid_costs = []
pre_test_costs = []
post_train_costs = []
post_valid_costs = []
post_test_costs = []
if state.vis_init:
bias_list[0].set_value(logit(numpy.clip(0.9,0.001,train_X.get_value().mean(axis=0))))
if state.test_model:
# If testing, do not train and go directly to generating samples, parzen window estimation, and inpainting
print 'Testing : skip training'
STOP = True
while not STOP:
counter += 1
t = time.time()
print counter,'\t',
with open(logfile,'a') as f:
f.write("{0!s}\t".format(counter))
#shuffle the data
data.sequence_mnist_data(train_X, train_Y, valid_X, valid_Y, test_X, test_Y, dataset, rng)
#train
#init recurrent hiddens as zero
recurrent_hiddens = [T.zeros((batch_size,recurrent_layer_size)).eval() for recurrent_layer_size in recurrent_layer_sizes]
pre_train_cost = []
post_train_cost = []
if iteration == 0:
for i in range(len(train_X.get_value(borrow=True)) / batch_size):
x = train_X.get_value()[i * batch_size : (i+1) * batch_size]
pre = f_learn_init(x)
pre_train_cost.append(pre)
post_train_cost.append(-1)
else:
for i in range(len(train_X.get_value(borrow=True)) / batch_size):
x = train_X.get_value()[i * batch_size : (i+1) * batch_size]
x1 = train_X.get_value()[(i * batch_size) + 1 : ((i+1) * batch_size) + 1]
[x,x1], recurrent_hiddens = fix_input_size([x,x1], recurrent_hiddens)
_ins = recurrent_hiddens + [x,x1]
_outs = f_learn(*_ins)
recurrent_hiddens = _outs[:len(recurrent_hiddens)]
pre = _outs[-2]
post = _outs[-1]
pre_train_cost.append(pre)
post_train_cost.append(post)
pre_train_cost = numpy.mean(pre_train_cost)
pre_train_costs.append(pre_train_cost)
post_train_cost = numpy.mean(post_train_cost)
post_train_costs.append(post_train_cost)
print 'Train : ',trunc(pre_train_cost),trunc(post_train_cost), '\t',
with open(logfile,'a') as f:
f.write("Train : {0!s} {1!s}\t".format(trunc(pre_train_cost),trunc(post_train_cost)))
with open(train_convergence_pre,'a') as f:
f.write("{0!s},".format(pre_train_cost))
with open(train_convergence_post,'a') as f:
f.write("{0!s},".format(post_train_cost))
#valid
#init recurrent hiddens as zero
recurrent_hiddens = [T.zeros((batch_size,recurrent_layer_size)).eval() for recurrent_layer_size in recurrent_layer_sizes]
pre_valid_cost = []
post_valid_cost = []
for i in range(len(valid_X.get_value(borrow=True)) / batch_size):
x = valid_X.get_value()[i * batch_size : (i+1) * batch_size]
x1 = valid_X.get_value()[(i * batch_size) + 1 : ((i+1) * batch_size) + 1]
[x,x1], recurrent_hiddens = fix_input_size([x,x1], recurrent_hiddens)
_ins = recurrent_hiddens + [x,x1]
_outs = f_cost(*_ins)
recurrent_hiddens = _outs[:len(recurrent_hiddens)]
pre = _outs[-2]
post = _outs[-1]
pre_valid_cost.append(pre)
post_valid_cost.append(post)
pre_valid_cost = numpy.mean(pre_valid_cost)
pre_valid_costs.append(pre_valid_cost)
post_valid_cost = numpy.mean(post_valid_cost)
post_valid_costs.append(post_valid_cost)
print 'Valid : ', trunc(pre_valid_cost),trunc(post_valid_cost), '\t',
with open(logfile,'a') as f:
f.write("Valid : {0!s} {1!s}\t".format(trunc(pre_valid_cost),trunc(post_valid_cost)))
with open(valid_convergence_pre,'a') as f:
f.write("{0!s},".format(pre_valid_cost))
with open(valid_convergence_post,'a') as f:
f.write("{0!s},".format(post_valid_cost))
#test
#init recurrent hiddens as zero
recurrent_hiddens = [T.zeros((batch_size,recurrent_layer_size)).eval() for recurrent_layer_size in recurrent_layer_sizes]
pre_test_cost = []
post_test_cost = []
for i in range(len(test_X.get_value(borrow=True)) / batch_size):
x = test_X.get_value()[i * batch_size : (i+1) * batch_size]
x1 = test_X.get_value()[(i * batch_size) + 1 : ((i+1) * batch_size) + 1]
[x,x1], recurrent_hiddens = fix_input_size([x,x1], recurrent_hiddens)
_ins = recurrent_hiddens + [x,x1]
_outs = f_cost(*_ins)
recurrent_hiddens = _outs[:len(recurrent_hiddens)]
pre = _outs[-2]
post = _outs[-1]
pre_test_cost.append(pre)
post_test_cost.append(post)
pre_test_cost = numpy.mean(pre_test_cost)
pre_test_costs.append(pre_test_cost)
post_test_cost = numpy.mean(post_test_cost)
post_test_costs.append(post_test_cost)
print 'Test : ', trunc(pre_test_cost),trunc(post_test_cost), '\t',
with open(logfile,'a') as f:
f.write("Test : {0!s} {1!s}\t".format(trunc(pre_test_cost),trunc(post_test_cost)))
with open(test_convergence_pre,'a') as f:
f.write("{0!s},".format(pre_test_cost))
with open(test_convergence_post,'a') as f:
f.write("{0!s},".format(post_test_cost))
#check for early stopping
cost = pre_train_cost
if iteration != 0:
cost = cost + post_train_cost
if cost < best_cost*state.early_stop_threshold:
patience = 0
best_cost = cost
else:
patience += 1
if counter >= n_epoch or patience >= state.early_stop_length:
STOP = True
save_params_to_file('gsn', counter, params, iteration)
print "next learning rate should be", learning_rate.get_value() * annealing
timing = time.time() - t
times.append(timing)
print 'time : ', trunc(timing),
print 'remaining: ', (n_epoch - counter) * numpy.mean(times) / 60 / 60, 'hrs'
if (counter % state.save_frequency) == 0:
# Checking reconstruction
nums = test_X.get_value()[range(100)]
noisy_nums = f_noise(test_X.get_value()[range(100)])
reconstructed = []
reconstructed_prediction = []
#init recurrent hiddens as zero
recurrent_hiddens = [T.zeros((batch_size,recurrent_layer_size)).eval() for recurrent_layer_size in recurrent_layer_sizes]
for num in noisy_nums:
_ins = recurrent_hiddens + [num]
_outs = f_recon(*_ins)
recurrent_hiddens = _outs[:len(recurrent_hiddens)]
[recon,recon_pred] = _outs[len(recurrent_hiddens):]
reconstructed.append(recon)
reconstructed_prediction.append(recon_pred)
# Concatenate stuff
stacked = numpy.vstack([numpy.vstack([nums[i*10 : (i+1)*10], noisy_nums[i*10 : (i+1)*10], reconstructed[i*10 : (i+1)*10], reconstructed_prediction[i*10 : (i+1)*10]]) for i in range(10)])
number_reconstruction = PIL.Image.fromarray(tile_raster_images(stacked, (root_N_input,root_N_input), (10,40)))
#epoch_number = reduce(lambda x,y : x + y, ['_'] * (4-len(str(counter)))) + str(counter)
number_reconstruction.save(outdir+'gsn_number_reconstruction_iteration_'+str(iteration)+'_epoch_'+str(counter)+'.png')
#sample_numbers(counter, 'seven')
plot_samples(counter, iteration)
#save params
save_params_to_file('gsn', counter, params, iteration)
# ANNEAL!
new_lr = learning_rate.get_value() * annealing
learning_rate.set_value(new_lr)
# if test
# 10k samples
print 'Generating 10,000 samples'
samples, _ = sample_some_numbers(N=10000)
f_samples = outdir+'samples.npy'
numpy.save(f_samples, samples)
print 'saved digits'
# parzen
# print 'Evaluating parzen window'
# import likelihood_estimation_parzen
# likelihood_estimation_parzen.main(0.20,'mnist')
# Inpainting
'''
print 'Inpainting'
test_X = test_X.get_value()
numpy.random.seed(2)
test_idx = numpy.arange(len(test_Y.get_value(borrow=True)))
for Iter in range(10):
numpy.random.shuffle(test_idx)
test_X = test_X[test_idx]
test_Y = test_Y[test_idx]
digit_idx = [(test_Y==i).argmax() for i in range(10)]
inpaint_list = []
for idx in digit_idx:
DIGIT = test_X[idx:idx+1]
V_inpaint, H_inpaint = inpainting(DIGIT)
inpaint_list.append(V_inpaint)
INPAINTING = numpy.vstack(inpaint_list)
plot_inpainting = PIL.Image.fromarray(tile_raster_images(INPAINTING, (root_N_input,root_N_input), (10,50)))
fname = 'inpainting_'+str(Iter)+'_iteration_'+str(iteration)+'.png'
#fname = os.path.join(state.model_path, fname)
plot_inpainting.save(fname)
'''
def train_regression(iteration, train_X, train_Y, valid_X, valid_Y, test_X, test_Y):
print '-------------------------------------------'
print 'TRAINING RECURRENT REGRESSION FOR ITERATION',iteration
with open(logfile,'a') as f:
f.write("--------------------------\nTRAINING RECURRENT REGRESSION FOR ITERATION {0!s}\n".format(iteration))
# TRAINING
# TRAINING
n_epoch = state.n_epoch
batch_size = state.batch_size
STOP = False
counter = 0
if iteration == 0:
recurrent_learning_rate.set_value(cast32(state.learning_rate)) # learning rate
times = []
best_cost = float('inf')
patience = 0
print 'learning rate:',recurrent_learning_rate.get_value()
print 'train X size:',str(train_X.shape.eval())
print 'valid X size:',str(valid_X.shape.eval())
print 'test X size:',str(test_X.shape.eval())
train_costs = []
valid_costs = []
test_costs = []
if state.vis_init:
bias_list[0].set_value(logit(numpy.clip(0.9,0.001,train_X.get_value().mean(axis=0))))
if state.test_model:
# If testing, do not train and go directly to generating samples, parzen window estimation, and inpainting
print 'Testing : skip training'
STOP = True
while not STOP:
counter += 1
t = time.time()
print counter,'\t',
#shuffle the data
data.sequence_mnist_data(train_X, train_Y, valid_X, valid_Y, test_X, test_Y, dataset, rng)
#train
#init recurrent hiddens as zero
recurrent_hiddens = [T.zeros((batch_size,recurrent_layer_size)).eval() for recurrent_layer_size in recurrent_layer_sizes]
train_cost = []
for i in range(len(train_X.get_value(borrow=True)) / batch_size):
x = train_X.get_value()[i * batch_size : (i+1) * batch_size]
x1 = train_X.get_value()[(i * batch_size) + 1 : ((i+1) * batch_size) + 1]
[x,x1], recurrent_hiddens = fix_input_size([x,x1], recurrent_hiddens)
_ins = recurrent_hiddens + [x,x1]
_outs = recurrent_f_learn(*_ins)
recurrent_hiddens = _outs[:len(recurrent_hiddens)]
cost = _outs[-1]
train_cost.append(cost)
train_cost = numpy.mean(train_cost)
train_costs.append(train_cost)
print 'rTrain : ',trunc(train_cost), '\t',
with open(logfile,'a') as f:
f.write("rTrain : {0!s}\t".format(trunc(train_cost)))
with open(recurrent_train_convergence,'a') as f:
f.write("{0!s},".format(train_cost))
#valid
#init recurrent hiddens as zero
recurrent_hiddens = [T.zeros((batch_size,recurrent_layer_size)).eval() for recurrent_layer_size in recurrent_layer_sizes]
valid_cost = []
for i in range(len(valid_X.get_value(borrow=True)) / batch_size):
x = valid_X.get_value()[i * batch_size : (i+1) * batch_size]
x1 = valid_X.get_value()[(i * batch_size) + 1 : ((i+1) * batch_size) + 1]
[x,x1], recurrent_hiddens = fix_input_size([x,x1], recurrent_hiddens)
_ins = recurrent_hiddens + [x,x1]
_outs = f_cost(*_ins)
recurrent_hiddens = _outs[:len(recurrent_hiddens)]
cost = _outs[-1]
valid_cost.append(cost)
valid_cost = numpy.mean(valid_cost)
valid_costs.append(valid_cost)
print 'rValid : ', trunc(valid_cost), '\t',
with open(logfile,'a') as f:
f.write("rValid : {0!s}\t".format(trunc(valid_cost)))
with open(recurrent_valid_convergence,'a') as f:
f.write("{0!s},".format(valid_cost))
#test
recurrent_hiddens = [T.zeros((batch_size,recurrent_layer_size)).eval() for recurrent_layer_size in recurrent_layer_sizes]
test_cost = []
for i in range(len(test_X.get_value(borrow=True)) / batch_size):
x = test_X.get_value()[i * batch_size : (i+1) * batch_size]
x1 = test_X.get_value()[(i * batch_size) + 1 : ((i+1) * batch_size) + 1]
[x,x1], recurrent_hiddens = fix_input_size([x,x1], recurrent_hiddens)
_ins = recurrent_hiddens + [x,x1]
_outs = f_cost(*_ins)
recurrent_hiddens = _outs[:len(recurrent_hiddens)]
cost = _outs[-1]
test_cost.append(cost)
test_cost = numpy.mean(test_cost)
test_costs.append(test_cost)
print 'rTest : ', trunc(test_cost), '\t',
with open(logfile,'a') as f:
f.write("rTest : {0!s}\t".format(trunc(test_cost)))
with open(recurrent_test_convergence,'a') as f:
f.write("{0!s},".format(test_cost))
#check for early stopping
cost = train_cost
if iteration != 0:
cost = cost + train_cost
if cost < best_cost*state.early_stop_threshold:
patience = 0
best_cost = cost
else:
patience += 1
timing = time.time() - t
times.append(timing)
print 'time : ', trunc(timing),
print 'remaining: ', trunc((n_epoch - counter) * numpy.mean(times) / 60 / 60), 'hrs'
with open(logfile,'a') as f:
f.write("B : {0!s}\t".format(str([trunc(vb.get_value().mean()) for vb in recurrent_bias_list])))
with open(logfile,'a') as f:
f.write("W : {0!s}\t".format(str([trunc(abs(v.get_value(borrow=True)).mean()) for v in recurrent_weights_list_encode])))
with open(logfile,'a') as f:
f.write("V : {0!s}\t".format(str([trunc(abs(v.get_value(borrow=True)).mean()) for v in recurrent_weights_list_decode])))
with open(logfile,'a') as f:
f.write("Time : {0!s} seconds\n".format(trunc(timing)))
if (counter % state.save_frequency) == 0:
# Checking reconstruction
nums = test_X.get_value()[range(100)]
noisy_nums = f_noise(test_X.get_value()[range(100)])
reconstructed = []
reconstructed_prediction = []
#init recurrent hiddens as zero
recurrent_hiddens = [T.zeros((batch_size,recurrent_layer_size)).eval() for recurrent_layer_size in recurrent_layer_sizes]
for num in noisy_nums:
_ins = recurrent_hiddens + [num]
_outs = f_recon(*_ins)
recurrent_hiddens = _outs[:len(recurrent_hiddens)]
[recon,recon_pred] = _outs[len(recurrent_hiddens):]
reconstructed.append(recon)
reconstructed_prediction.append(recon_pred)
# Concatenate stuff
stacked = numpy.vstack([numpy.vstack([nums[i*10 : (i+1)*10], noisy_nums[i*10 : (i+1)*10], reconstructed[i*10 : (i+1)*10], reconstructed_prediction[i*10 : (i+1)*10]]) for i in range(10)])
number_reconstruction = PIL.Image.fromarray(tile_raster_images(stacked, (root_N_input,root_N_input), (10,40)))
#epoch_number = reduce(lambda x,y : x + y, ['_'] * (4-len(str(counter)))) + str(counter)
number_reconstruction.save(outdir+'recurrent_number_reconstruction_iteration_'+str(iteration)+'_epoch_'+str(counter)+'.png')
#sample_numbers(counter, 'seven')
plot_samples(counter, iteration)
#save params
save_params_to_file('recurrent', counter, params, iteration)
# ANNEAL!
new_r_lr = recurrent_learning_rate.get_value() * annealing
recurrent_learning_rate.set_value(new_r_lr)
# if test
# 10k samples
print 'Generating 10,000 samples'
samples, _ = sample_some_numbers(N=10000)
f_samples = outdir+'samples.npy'
numpy.save(f_samples, samples)
print 'saved digits'
#####################
# STORY 3 ALGORITHM #
#####################
for iter in range(state.max_iterations):
train_GSN(iter, train_X, train_Y, valid_X, valid_Y, test_X, test_Y)
train_regression(iter, train_X, train_Y, valid_X, valid_Y, test_X, test_Y)
def train(self, batch_size=100, num_epochs=300):
'''Train the RNN-RBM via stochastic gradient descent (SGD) using MIDI
files converted to piano-rolls.
files : list of strings
List of MIDI files that will be loaded as piano-rolls for training.
batch_size : integer
Training sequences will be split into subsequences of at most this size
before applying the SGD updates.
num_epochs : integer
Number of epochs (pass over the training set) performed. The user can
safely interrupt training with Ctrl+C at any time.'''
(train_X,
train_Y), (valid_X,
valid_Y), (test_X,
test_Y) = data.load_mnist("../datasets/")
train_X = numpy.concatenate((train_X, valid_X))
train_Y = numpy.concatenate((train_Y, valid_Y))
print 'Sequencing MNIST data...'
print 'train set size:', train_X.shape
print 'valid set size:', valid_X.shape
print 'test set size:', test_X.shape
train_X = theano.shared(train_X)
train_Y = theano.shared(train_Y)
valid_X = theano.shared(valid_X)
valid_Y = theano.shared(valid_Y)
test_X = theano.shared(test_X)
test_Y = theano.shared(test_Y)
data.sequence_mnist_data(train_X,
train_Y,
valid_X,
valid_Y,
test_X,
test_Y,
dataset=4)
print 'train set size:', train_X.shape.eval()
print 'valid set size:', valid_X.shape.eval()
print 'test set size:', test_X.shape.eval()
print 'Sequencing done.'
print
N_input = train_X.eval().shape[1]
self.root_N_input = numpy.sqrt(N_input)
times = []
try:
for epoch in xrange(num_epochs):
t = time.time()
print 'Epoch %i/%i : ' % (epoch + 1, num_epochs)
# sequence_mnist_data(train_X, train_Y, valid_X, valid_Y, test_X, test_Y)
accuracy = []
costs = []
crossentropy = []
tests = []
test_acc = []
for i in range(
len(train_X.get_value(borrow=True)) / batch_size):
t0 = time.time()
xs = train_X.get_value(
borrow=True)[(i * batch_size):((i + 1) * batch_size)]
acc, cost, cross = self.train_function(xs)
accuracy.append(acc)
costs.append(cost)
crossentropy.append(cross)
print time.time() - t0
print 'Train', numpy.mean(accuracy), 'cost', numpy.mean(
costs), 'cross', numpy.mean(crossentropy),
for i in range(
len(test_X.get_value(borrow=True)) / batch_size):
xs = train_X.get_value(
borrow=True)[(i * batch_size):((i + 1) * batch_size)]
acc, cost = self.test_function(xs)
test_acc.append(acc)
tests.append(cost)
print '\t Test_acc', numpy.mean(test_acc), "cross", numpy.mean(
tests)
timing = time.time() - t
times.append(timing)
print 'time : ', trunc(timing),
print 'remaining: ', (
num_epochs -
(epoch + 1)) * numpy.mean(times) / 60 / 60, 'hrs'
sys.stdout.flush()
#new learning rate
new_lr = self.lr.get_value() * self.annealing
self.lr.set_value(new_lr)
except KeyboardInterrupt:
print 'Interrupted by user.'
def experiment(state, outdir_base='./'):
rng.seed(1) #seed the numpy random generator
R.seed(1) #seed the other random generator (for reconstruction function indices)
# Initialize output directory and files
data.mkdir_p(outdir_base)
outdir = outdir_base + "/" + state.dataset + "/"
data.mkdir_p(outdir)
logger = Logger(outdir)
logger.log("----------MODEL 2, {0!s}-----------\n".format(state.dataset))
if state.initialize_gsn:
gsn_train_convergence = outdir+"gsn_train_convergence.csv"
gsn_valid_convergence = outdir+"gsn_valid_convergence.csv"
gsn_test_convergence = outdir+"gsn_test_convergence.csv"
train_convergence = outdir+"train_convergence.csv"
valid_convergence = outdir+"valid_convergence.csv"
test_convergence = outdir+"test_convergence.csv"
if state.initialize_gsn:
init_empty_file(gsn_train_convergence)
init_empty_file(gsn_valid_convergence)
init_empty_file(gsn_test_convergence)
init_empty_file(train_convergence)
init_empty_file(valid_convergence)
init_empty_file(test_convergence)
#load parameters from config file if this is a test
config_filename = outdir+'config'
if state.test_model and 'config' in os.listdir(outdir):
config_vals = load_from_config(config_filename)
for CV in config_vals:
logger.log(CV)
if CV.startswith('test'):
logger.log('Do not override testing switch')
continue
try:
exec('state.'+CV) in globals(), locals()
except:
exec('state.'+CV.split('=')[0]+"='"+CV.split('=')[1]+"'") in globals(), locals()
else:
# Save the current configuration
# Useful for logs/experiments
logger.log('Saving config')
with open(config_filename, 'w') as f:
f.write(str(state))
logger.log(state)
####################################################
# Load the data, train = train+valid, and sequence #
####################################################
artificial = False
if state.dataset == 'MNIST_1' or state.dataset == 'MNIST_2' or state.dataset == 'MNIST_3':
(train_X, train_Y), (valid_X, valid_Y), (test_X, test_Y) = data.load_mnist(state.data_path)
train_X = numpy.concatenate((train_X, valid_X))
train_Y = numpy.concatenate((train_Y, valid_Y))
artificial = True
try:
dataset = int(state.dataset.split('_')[1])
except:
logger.log("ERROR: artificial dataset number not recognized. Input was "+str(state.dataset))
raise AssertionError("artificial dataset number not recognized. Input was "+str(state.dataset))
else:
logger.log("ERROR: dataset not recognized.")
raise AssertionError("dataset not recognized.")
# transfer the datasets into theano shared variables
train_X, train_Y = data.shared_dataset((train_X, train_Y), borrow=True)
valid_X, valid_Y = data.shared_dataset((valid_X, valid_Y), borrow=True)
test_X, test_Y = data.shared_dataset((test_X, test_Y), borrow=True)
if artificial:
logger.log('Sequencing MNIST data...')
logger.log(['train set size:',len(train_Y.eval())])
logger.log(['train set size:',len(valid_Y.eval())])
logger.log(['train set size:',len(test_Y.eval())])
data.sequence_mnist_data(train_X, train_Y, valid_X, valid_Y, test_X, test_Y, dataset, rng)
logger.log(['train set size:',len(train_Y.eval())])
logger.log(['train set size:',len(valid_Y.eval())])
logger.log(['train set size:',len(test_Y.eval())])
logger.log('Sequencing done.\n')
N_input = train_X.eval().shape[1]
root_N_input = numpy.sqrt(N_input)
# Network and training specifications
layers = state.layers # number hidden layers
walkbacks = state.walkbacks # number of walkbacks
layer_sizes = [N_input] + [state.hidden_size] * layers # layer sizes, from h0 to hK (h0 is the visible layer)
learning_rate = theano.shared(cast32(state.learning_rate)) # learning rate
annealing = cast32(state.annealing) # exponential annealing coefficient
momentum = theano.shared(cast32(state.momentum)) # momentum term
##############
# PARAMETERS #
##############
#gsn
weights_list = [get_shared_weights(layer_sizes[i], layer_sizes[i+1], name="W_{0!s}_{1!s}".format(i,i+1)) for i in range(layers)] # initialize each layer to uniform sample from sqrt(6. / (n_in + n_out))
bias_list = [get_shared_bias(layer_sizes[i], name='b_'+str(i)) for i in range(layers + 1)] # initialize each layer to 0's.
#recurrent
recurrent_to_gsn_bias_weights_list = [get_shared_weights(state.recurrent_hidden_size, layer_sizes[layer], name="W_u_b{0!s}".format(layer)) for layer in range(layers+1)]
W_u_u = get_shared_weights(state.recurrent_hidden_size, state.recurrent_hidden_size, name="W_u_u")
W_x_u = get_shared_weights(N_input, state.recurrent_hidden_size, name="W_x_u")
recurrent_bias = get_shared_bias(state.recurrent_hidden_size, name='b_u')
#lists for use with gradients
gsn_params = weights_list + bias_list
u_params = [W_u_u, W_x_u, recurrent_bias]
params = gsn_params + recurrent_to_gsn_bias_weights_list + u_params
###########################################################
# load initial parameters of gsn #
###########################################################
train_gsn_first = False
if state.initialize_gsn:
params_to_load = 'gsn_params.pkl'
if not os.path.isfile(params_to_load):
train_gsn_first = True
else:
logger.log("\nLoading existing GSN parameters\n")
loaded_params = cPickle.load(open(params_to_load,'r'))
[p.set_value(lp.get_value(borrow=False)) for lp, p in zip(loaded_params[:len(weights_list)], weights_list)]
[p.set_value(lp.get_value(borrow=False)) for lp, p in zip(loaded_params[len(weights_list):], bias_list)]
############################
# Theano variables and RNG #
############################
MRG = RNG_MRG.MRG_RandomStreams(1)
X = T.fmatrix('X') #single (batch) for training gsn
Xs = T.fmatrix(name="Xs") #sequence for training rnn-gsn
########################
# ACTIVATION FUNCTIONS #
########################
# hidden activation
if state.hidden_act == 'sigmoid':
logger.log('Using sigmoid activation for hiddens')
hidden_activation = T.nnet.sigmoid
elif state.hidden_act == 'rectifier':
logger.log('Using rectifier activation for hiddens')
hidden_activation = lambda x : T.maximum(cast32(0), x)
elif state.hidden_act == 'tanh':
logger.log('Using hyperbolic tangent activation for hiddens')
hidden_activation = lambda x : T.tanh(x)
else:
logger.log("ERROR: Did not recognize hidden activation {0!s}, please use tanh, rectifier, or sigmoid".format(state.hidden_act))
raise NotImplementedError("Did not recognize hidden activation {0!s}, please use tanh, rectifier, or sigmoid".format(state.hidden_act))
# visible activation
if state.visible_act == 'sigmoid':
logger.log('Using sigmoid activation for visible layer')
visible_activation = T.nnet.sigmoid
elif state.visible_act == 'softmax':
logger.log('Using softmax activation for visible layer')
visible_activation = T.nnet.softmax
else:
logger.log("ERROR: Did not recognize visible activation {0!s}, please use sigmoid or softmax".format(state.visible_act))
raise NotImplementedError("Did not recognize visible activation {0!s}, please use sigmoid or softmax".format(state.visible_act))
# recurrent activation
if state.recurrent_hidden_act == 'sigmoid':
logger.log('Using sigmoid activation for recurrent hiddens')
recurrent_hidden_activation = T.nnet.sigmoid
elif state.recurrent_hidden_act == 'rectifier':
logger.log('Using rectifier activation for recurrent hiddens')
recurrent_hidden_activation = lambda x : T.maximum(cast32(0), x)
elif state.recurrent_hidden_act == 'tanh':
logger.log('Using hyperbolic tangent activation for recurrent hiddens')
recurrent_hidden_activation = lambda x : T.tanh(x)
else:
logger.log("ERROR: Did not recognize recurrent hidden activation {0!s}, please use tanh, rectifier, or sigmoid".format(state.recurrent_hidden_act))
raise NotImplementedError("Did not recognize recurrent hidden activation {0!s}, please use tanh, rectifier, or sigmoid".format(state.recurrent_hidden_act))
logger.log("\n")
####################
# COST FUNCTIONS #
####################
if state.cost_funct == 'binary_crossentropy':
logger.log('Using binary cross-entropy cost!')
cost_function = lambda x,y: T.mean(T.nnet.binary_crossentropy(x,y))
elif state.cost_funct == 'square':
logger.log("Using square error cost!")
#cost_function = lambda x,y: T.log(T.mean(T.sqr(x-y)))
cost_function = lambda x,y: T.log(T.sum(T.pow((x-y),2)))
else:
logger.log("ERROR: Did not recognize cost function {0!s}, please use binary_crossentropy or square".format(state.cost_funct))
raise NotImplementedError("Did not recognize cost function {0!s}, please use binary_crossentropy or square".format(state.cost_funct))
logger.log("\n")
##############################################
# Build the training graph for the GSN #
##############################################
if train_gsn_first:
'''Build the actual gsn training graph'''
p_X_chain_gsn, _ = generative_stochastic_network.build_gsn(X,
weights_list,
bias_list,
True,
state.noiseless_h1,
state.hidden_add_noise_sigma,
state.input_salt_and_pepper,
state.input_sampling,
MRG,
visible_activation,
hidden_activation,
walkbacks,
logger)
# now without noise
p_X_chain_gsn_recon, _ = generative_stochastic_network.build_gsn(X,
weights_list,
bias_list,
False,
state.noiseless_h1,
state.hidden_add_noise_sigma,
state.input_salt_and_pepper,
state.input_sampling,
MRG,
visible_activation,
hidden_activation,
walkbacks,
logger)
##############################################
# Build the training graph for the RNN-GSN #
##############################################
# If `x_t` is given, deterministic recurrence to compute the u_t. Otherwise, first generate
def recurrent_step(x_t, u_tm1):
bv_t = bias_list[0] + T.dot(u_tm1, recurrent_to_gsn_bias_weights_list[0])
bh_t = T.concatenate([bias_list[i+1] + T.dot(u_tm1, recurrent_to_gsn_bias_weights_list[i+1]) for i in range(layers)],axis=0)
generate = x_t is None
if generate:
pass
ua_t = T.dot(x_t, W_x_u) + T.dot(u_tm1, W_u_u) + recurrent_bias
u_t = recurrent_hidden_activation(ua_t)
return None if generate else [ua_t, u_t, bv_t, bh_t]
logger.log("\nCreating recurrent step scan.")
# For training, the deterministic recurrence is used to compute all the
# {h_t, 1 <= t <= T} given Xs. Conditional GSNs can then be trained
# in batches using those parameters.
u0 = T.zeros((state.recurrent_hidden_size,)) # initial value for the RNN hidden units
(ua, u, bv_t, bh_t), updates_recurrent = theano.scan(fn=lambda x_t, u_tm1, *_: recurrent_step(x_t, u_tm1),
sequences=Xs,
outputs_info=[None, u0, None, None],
non_sequences=params)
# put the bias_list together from hiddens and visible biases
#b_list = [bv_t.flatten(2)] + [bh_t.dimshuffle((1,0,2))[i] for i in range(len(weights_list))]
b_list = [bv_t] + [(bh_t.T[i*state.hidden_size:(i+1)*state.hidden_size]).T for i in range(layers)]
_, cost, show_cost = generative_stochastic_network.build_gsn_scan(Xs, weights_list, b_list, True, state.noiseless_h1, state.hidden_add_noise_sigma, state.input_salt_and_pepper, state.input_sampling, MRG, visible_activation, hidden_activation, walkbacks, cost_function, logger)
x_sample_recon, _, _ = generative_stochastic_network.build_gsn_scan(Xs, weights_list, b_list, False, state.noiseless_h1, state.hidden_add_noise_sigma, state.input_salt_and_pepper, state.input_sampling, MRG, visible_activation, hidden_activation, walkbacks, cost_function, logger)
updates_train = updates_recurrent
#updates_train.update(updates_gsn)
updates_cost = updates_recurrent
#updates_recon = updates_recurrent
#updates_recon.update(updates_gsn_recon)
#############
# COSTS #
#############
logger.log("")
logger.log('Cost w.r.t p(X|...) at every step in the graph')
if train_gsn_first:
gsn_costs = [cost_function(rX, X) for rX in p_X_chain_gsn]
gsn_show_cost = gsn_costs[-1]
gsn_cost = numpy.sum(gsn_costs)
###################################
# GRADIENTS AND FUNCTIONS FOR GSN #
###################################
logger.log(["params:",params])
logger.log("creating functions...")
start_functions_time = time.time()
if train_gsn_first:
gradient_gsn = T.grad(gsn_cost, gsn_params)
gradient_buffer_gsn = [theano.shared(numpy.zeros(param.get_value().shape, dtype='float32')) for param in gsn_params]
m_gradient_gsn = [momentum * gb + (cast32(1) - momentum) * g for (gb, g) in zip(gradient_buffer_gsn, gradient_gsn)]
param_updates_gsn = [(param, param - learning_rate * mg) for (param, mg) in zip(gsn_params, m_gradient_gsn)]
gradient_buffer_updates_gsn = zip(gradient_buffer_gsn, m_gradient_gsn)
grad_updates_gsn = OrderedDict(param_updates_gsn + gradient_buffer_updates_gsn)
logger.log("gsn cost...")
f_cost_gsn = theano.function(inputs = [X],
outputs = gsn_show_cost,
on_unused_input='warn')
logger.log("gsn learn...")
f_learn_gsn = theano.function(inputs = [X],
updates = grad_updates_gsn,
outputs = gsn_show_cost,
on_unused_input='warn')
#######################################
# GRADIENTS AND FUNCTIONS FOR RNN-GSN #
#######################################
# if we are not using Hessian-free training create the normal sgd functions
if state.hessian_free == 0:
gradient = T.grad(cost, params)
gradient_buffer = [theano.shared(numpy.zeros(param.get_value().shape, dtype='float32')) for param in params]
m_gradient = [momentum * gb + (cast32(1) - momentum) * g for (gb, g) in zip(gradient_buffer, gradient)]
param_updates = [(param, param - learning_rate * mg) for (param, mg) in zip(params, m_gradient)]
gradient_buffer_updates = zip(gradient_buffer, m_gradient)
updates = OrderedDict(param_updates + gradient_buffer_updates)
updates_train.update(updates)
logger.log("rnn-gsn learn...")
f_learn = theano.function(inputs = [Xs],
updates = updates_train,
outputs = show_cost,
on_unused_input='warn')
logger.log("rnn-gsn cost...")
f_cost = theano.function(inputs = [Xs],
updates = updates_cost,
outputs = show_cost,
on_unused_input='warn')
logger.log("Training/cost functions done.")
compilation_time = time.time() - start_functions_time
# Show the compile time with appropriate easy-to-read units.
logger.log("Compilation took "+make_time_units_string(compilation_time)+".\n\n")
############################################################################################
# Denoise some numbers : show number, noisy number, predicted number, reconstructed number #
############################################################################################
# Recompile the graph without noise for reconstruction function
# The layer update scheme
logger.log("Creating graph for noisy reconstruction function at checkpoints during training.")
f_recon = theano.function(inputs=[Xs], outputs=x_sample_recon[-1])
# Now do the same but for the GSN in the initial run
if train_gsn_first:
f_recon_gsn = theano.function(inputs=[X], outputs = p_X_chain_gsn_recon[-1])
logger.log("Done compiling all functions.")
compilation_time = time.time() - start_functions_time
# Show the compile time with appropriate easy-to-read units.
logger.log("Total time took "+make_time_units_string(compilation_time)+".\n\n")
############
# Sampling #
############
# a function to add salt and pepper noise
f_noise = theano.function(inputs = [X], outputs = salt_and_pepper(X, state.input_salt_and_pepper))
# the input to the sampling function
X_sample = T.fmatrix("X_sampling")
network_state_input = [X_sample] + [T.fmatrix("H_sampling_"+str(i+1)) for i in range(layers)]
# "Output" state of the network (noisy)
# initialized with input, then we apply updates
network_state_output = [X_sample] + network_state_input[1:]
visible_pX_chain = []
# ONE update
logger.log("Performing one walkback in network state sampling.")
generative_stochastic_network.update_layers(network_state_output,
weights_list,
bias_list,
visible_pX_chain,
True,
state.noiseless_h1,
state.hidden_add_noise_sigma,
state.input_salt_and_pepper,
state.input_sampling,
MRG,
visible_activation,
hidden_activation,
logger)
if layers == 1:
f_sample_simple = theano.function(inputs = [X_sample], outputs = visible_pX_chain[-1])
# WHY IS THERE A WARNING????
# because the first odd layers are not used -> directly computed FROM THE EVEN layers
# unused input = warn
f_sample2 = theano.function(inputs = network_state_input, outputs = network_state_output + visible_pX_chain, on_unused_input='warn')
def sample_some_numbers_single_layer():
x0 = test_X.get_value()[:1]
samples = [x0]
x = f_noise(x0)
for i in range(399):
x = f_sample_simple(x)
samples.append(x)
x = numpy.random.binomial(n=1, p=x, size=x.shape).astype('float32')
x = f_noise(x)
return numpy.vstack(samples)
def sampling_wrapper(NSI):
# * is the "splat" operator: It takes a list as input, and expands it into actual positional arguments in the function call.
out = f_sample2(*NSI)
NSO = out[:len(network_state_output)]
vis_pX_chain = out[len(network_state_output):]
return NSO, vis_pX_chain
def sample_some_numbers(N=400):
# The network's initial state
init_vis = test_X.get_value()[:1]
noisy_init_vis = f_noise(init_vis)
network_state = [[noisy_init_vis] + [numpy.zeros((1,len(b.get_value())), dtype='float32') for b in bias_list[1:]]]
visible_chain = [init_vis]
noisy_h0_chain = [noisy_init_vis]
for i in range(N-1):
# feed the last state into the network, compute new state, and obtain visible units expectation chain
net_state_out, vis_pX_chain = sampling_wrapper(network_state[-1])
# append to the visible chain
visible_chain += vis_pX_chain
# append state output to the network state chain
network_state.append(net_state_out)
noisy_h0_chain.append(net_state_out[0])
return numpy.vstack(visible_chain), numpy.vstack(noisy_h0_chain)
def plot_samples(epoch_number, leading_text):
to_sample = time.time()
if layers == 1:
# one layer model
V = sample_some_numbers_single_layer()
else:
V, H0 = sample_some_numbers()
img_samples = PIL.Image.fromarray(tile_raster_images(V, (root_N_input,root_N_input), (20,20)))
fname = outdir+leading_text+'samples_epoch_'+str(epoch_number)+'.png'
img_samples.save(fname)
logger.log('Took ' + str(time.time() - to_sample) + ' to sample 400 numbers')
#############################
# Save the model parameters #
#############################
def save_params_to_file(name, n, gsn_params):
pass
# print 'saving parameters...'
# save_path = outdir+name+'_params_epoch_'+str(n)+'.pkl'
# f = open(save_path, 'wb')
# try:
# cPickle.dump(gsn_params, f, protocol=cPickle.HIGHEST_PROTOCOL)
# finally:
# f.close()
def save_params(params):
values = [param.get_value(borrow=True) for param in params]
return values
def restore_params(params, values):
for i in range(len(params)):
params[i].set_value(values[i])
################
# GSN TRAINING #
################
def train_GSN(train_X, train_Y, valid_X, valid_Y, test_X, test_Y):
logger.log("\n-----------TRAINING GSN------------\n")
# TRAINING
n_epoch = state.n_epoch
batch_size = state.gsn_batch_size
STOP = False
counter = 0
learning_rate.set_value(cast32(state.learning_rate)) # learning rate
times = []
best_cost = float('inf')
best_params = None
patience = 0
logger.log(['train X size:',str(train_X.shape.eval())])
logger.log(['valid X size:',str(valid_X.shape.eval())])
logger.log(['test X size:',str(test_X.shape.eval())])
if state.vis_init:
bias_list[0].set_value(logit(numpy.clip(0.9,0.001,train_X.get_value().mean(axis=0))))
if state.test_model:
# If testing, do not train and go directly to generating samples, parzen window estimation, and inpainting
logger.log('Testing : skip training')
STOP = True
while not STOP:
counter += 1
t = time.time()
logger.append([counter,'\t'])
#shuffle the data
data.sequence_mnist_data(train_X, train_Y, valid_X, valid_Y, test_X, test_Y, dataset, rng)
#train
train_costs = []
for i in xrange(len(train_X.get_value(borrow=True)) / batch_size):
x = train_X.get_value()[i * batch_size : (i+1) * batch_size]
cost = f_learn_gsn(x)
train_costs.append([cost])
train_costs = numpy.mean(train_costs)
# record it
logger.append(['Train:',trunc(train_costs),'\t'])
with open(gsn_train_convergence,'a') as f:
f.write("{0!s},".format(train_costs))
f.write("\n")
#valid
valid_costs = []
for i in xrange(len(valid_X.get_value(borrow=True)) / batch_size):
x = valid_X.get_value()[i * batch_size : (i+1) * batch_size]
cost = f_cost_gsn(x)
valid_costs.append([cost])
valid_costs = numpy.mean(valid_costs)
# record it
logger.append(['Valid:',trunc(valid_costs), '\t'])
with open(gsn_valid_convergence,'a') as f:
f.write("{0!s},".format(valid_costs))
f.write("\n")
#test
test_costs = []
for i in xrange(len(test_X.get_value(borrow=True)) / batch_size):
x = test_X.get_value()[i * batch_size : (i+1) * batch_size]
cost = f_cost_gsn(x)
test_costs.append([cost])
test_costs = numpy.mean(test_costs)
# record it
logger.append(['Test:',trunc(test_costs), '\t'])
with open(gsn_test_convergence,'a') as f:
f.write("{0!s},".format(test_costs))
f.write("\n")
#check for early stopping
cost = numpy.sum(valid_costs)
if cost < best_cost*state.early_stop_threshold:
patience = 0
best_cost = cost
# save the parameters that made it the best
best_params = save_params(gsn_params)
else:
patience += 1
if counter >= n_epoch or patience >= state.early_stop_length:
STOP = True
if best_params is not None:
restore_params(gsn_params, best_params)
save_params_to_file('gsn', counter, gsn_params)
timing = time.time() - t
times.append(timing)
logger.append('time: '+make_time_units_string(timing)+'\t')
logger.log('remaining: '+make_time_units_string((n_epoch - counter) * numpy.mean(times)))
if (counter % state.save_frequency) == 0 or STOP is True:
n_examples = 100
random_idx = numpy.array(R.sample(range(len(test_X.get_value(borrow=True))), n_examples))
numbers = test_X.get_value(borrow=True)[random_idx]
noisy_numbers = f_noise(test_X.get_value(borrow=True)[random_idx])
reconstructed = f_recon_gsn(noisy_numbers)
# Concatenate stuff
stacked = numpy.vstack([numpy.vstack([numbers[i*10 : (i+1)*10], noisy_numbers[i*10 : (i+1)*10], reconstructed[i*10 : (i+1)*10]]) for i in range(10)])
number_reconstruction = PIL.Image.fromarray(tile_raster_images(stacked, (root_N_input,root_N_input), (10,30)))
number_reconstruction.save(outdir+'gsn_number_reconstruction_epoch_'+str(counter)+'.png')
#sample_numbers(counter, 'seven')
plot_samples(counter, 'gsn')
#save gsn_params
save_params_to_file('gsn', counter, gsn_params)
# ANNEAL!
new_lr = learning_rate.get_value() * annealing
learning_rate.set_value(new_lr)
# 10k samples
print 'Generating 10,000 samples'
samples, _ = sample_some_numbers(N=10000)
f_samples = outdir+'samples.npy'
numpy.save(f_samples, samples)
print 'saved digits'
def train_RNN_GSN(train_X, train_Y, valid_X, valid_Y, test_X, test_Y):
# If we are using Hessian-free training
if state.hessian_free == 1:
pass
# gradient_dataset = hf_sequence_dataset([train_X.get_value()], batch_size=None, number_batches=5000)
# cg_dataset = hf_sequence_dataset([train_X.get_value()], batch_size=None, number_batches=1000)
# valid_dataset = hf_sequence_dataset([valid_X.get_value()], batch_size=None, number_batches=1000)
#
# s = x_samples
# costs = [cost, show_cost]
# hf_optimizer(params, [Xs], s, costs, u, ua).train(gradient_dataset, cg_dataset, initial_lambda=1.0, preconditioner=True, validation=valid_dataset)
# If we are using SGD training
else:
# Define the re-used loops for f_learn and f_cost
def apply_cost_function_to_dataset(function, dataset):
costs = []
for i in xrange(len(dataset.get_value(borrow=True)) / batch_size):
xs = dataset.get_value(borrow=True)[i * batch_size : (i+1) * batch_size]
cost = function(xs)
costs.append([cost])
return numpy.mean(costs)
logger.log("\n-----------TRAINING RNN-GSN------------\n")
# TRAINING
n_epoch = state.n_epoch
batch_size = state.batch_size
STOP = False
counter = 0
learning_rate.set_value(cast32(state.learning_rate)) # learning rate
times = []
best_cost = float('inf')
best_params = None
patience = 0
logger.log(['train X size:',str(train_X.shape.eval())])
logger.log(['valid X size:',str(valid_X.shape.eval())])
logger.log(['test X size:',str(test_X.shape.eval())])
if state.vis_init:
bias_list[0].set_value(logit(numpy.clip(0.9,0.001,train_X.get_value().mean(axis=0))))
if state.test_model:
# If testing, do not train and go directly to generating samples, parzen window estimation, and inpainting
logger.log('Testing : skip training')
STOP = True
while not STOP:
counter += 1
t = time.time()
logger.append([counter,'\t'])
#shuffle the data
data.sequence_mnist_data(train_X, train_Y, valid_X, valid_Y, test_X, test_Y, dataset, rng)
#train
train_costs = apply_cost_function_to_dataset(f_learn, train_X)
# record it
logger.append(['Train:',trunc(train_costs),'\t'])
with open(train_convergence,'a') as f:
f.write("{0!s},".format(train_costs))
f.write("\n")
#valid
valid_costs = apply_cost_function_to_dataset(f_cost, valid_X)
# record it
logger.append(['Valid:',trunc(valid_costs), '\t'])
with open(valid_convergence,'a') as f:
f.write("{0!s},".format(valid_costs))
f.write("\n")
#test
test_costs = apply_cost_function_to_dataset(f_cost, test_X)
# record it
logger.append(['Test:',trunc(test_costs), '\t'])
with open(test_convergence,'a') as f:
f.write("{0!s},".format(test_costs))
f.write("\n")
#check for early stopping
cost = numpy.sum(valid_costs)
if cost < best_cost*state.early_stop_threshold:
patience = 0
best_cost = cost
# save the parameters that made it the best
best_params = save_params(params)
else:
patience += 1
if counter >= n_epoch or patience >= state.early_stop_length:
STOP = True
if best_params is not None:
restore_params(params, best_params)
save_params_to_file('all', counter, params)
timing = time.time() - t
times.append(timing)
logger.append('time: '+make_time_units_string(timing)+'\t')
logger.log('remaining: '+make_time_units_string((n_epoch - counter) * numpy.mean(times)))
if (counter % state.save_frequency) == 0 or STOP is True:
n_examples = 100
nums = test_X.get_value(borrow=True)[range(n_examples)]
noisy_nums = f_noise(test_X.get_value(borrow=True)[range(n_examples)])
reconstructions = []
for i in xrange(0, len(noisy_nums)):
recon = f_recon(noisy_nums[max(0,(i+1)-batch_size):i+1])
reconstructions.append(recon)
reconstructed = numpy.array(reconstructions)
# Concatenate stuff
stacked = numpy.vstack([numpy.vstack([nums[i*10 : (i+1)*10], noisy_nums[i*10 : (i+1)*10], reconstructed[i*10 : (i+1)*10]]) for i in range(10)])
number_reconstruction = PIL.Image.fromarray(tile_raster_images(stacked, (root_N_input,root_N_input), (10,30)))
number_reconstruction.save(outdir+'rnngsn_number_reconstruction_epoch_'+str(counter)+'.png')
#sample_numbers(counter, 'seven')
plot_samples(counter, 'rnngsn')
#save params
save_params_to_file('all', counter, params)
# ANNEAL!
new_lr = learning_rate.get_value() * annealing
learning_rate.set_value(new_lr)
# 10k samples
print 'Generating 10,000 samples'
samples, _ = sample_some_numbers(N=10000)
f_samples = outdir+'samples.npy'
numpy.save(f_samples, samples)
print 'saved digits'
#####################
# STORY 2 ALGORITHM #
#####################
# train the GSN parameters first to get a good baseline (if not loaded from parameter .pkl file)
if train_gsn_first:
train_GSN(train_X, train_Y, valid_X, valid_Y, test_X, test_Y)
# train the entire RNN-GSN
train_RNN_GSN(train_X, train_Y, valid_X, valid_Y, test_X, test_Y)
def train_RNN_GSN(train_X, train_Y, valid_X, valid_Y, test_X, test_Y):
# If we are using Hessian-free training
if state.hessian_free == 1:
pass
# gradient_dataset = hf_sequence_dataset([train_X.get_value()], batch_size=None, number_batches=5000)
# cg_dataset = hf_sequence_dataset([train_X.get_value()], batch_size=None, number_batches=1000)
# valid_dataset = hf_sequence_dataset([valid_X.get_value()], batch_size=None, number_batches=1000)
#
# s = x_samples
# costs = [cost, show_cost]
# hf_optimizer(params, [Xs], s, costs, u, ua).train(gradient_dataset, cg_dataset, initial_lambda=1.0, preconditioner=True, validation=valid_dataset)
# If we are using SGD training
else:
# Define the re-used loops for f_learn and f_cost
def apply_cost_function_to_dataset(function, dataset):
costs = []
for i in xrange(
len(dataset.get_value(borrow=True)) / batch_size):
xs = dataset.get_value(
borrow=True)[i * batch_size:(i + 1) * batch_size]
cost = function(xs)
costs.append([cost])
return numpy.mean(costs)
logger.log("\n-----------TRAINING RNN-GSN------------\n")
# TRAINING
n_epoch = state.n_epoch
batch_size = state.batch_size
STOP = False
counter = 0
learning_rate.set_value(cast32(
state.learning_rate)) # learning rate
times = []
best_cost = float('inf')
best_params = None
patience = 0
logger.log(['train X size:', str(train_X.shape.eval())])
logger.log(['valid X size:', str(valid_X.shape.eval())])
logger.log(['test X size:', str(test_X.shape.eval())])
if state.vis_init:
bias_list[0].set_value(
logit(
numpy.clip(0.9, 0.001,
train_X.get_value().mean(axis=0))))
if state.test_model:
# If testing, do not train and go directly to generating samples, parzen window estimation, and inpainting
logger.log('Testing : skip training')
STOP = True
while not STOP:
counter += 1
t = time.time()
logger.append([counter, '\t'])
#shuffle the data
data.sequence_mnist_data(train_X, train_Y, valid_X, valid_Y,
test_X, test_Y, dataset, rng)
#train
train_costs = apply_cost_function_to_dataset(f_learn, train_X)
# record it
logger.append(['Train:', trunc(train_costs), '\t'])
with open(train_convergence, 'a') as f:
f.write("{0!s},".format(train_costs))
f.write("\n")
#valid
valid_costs = apply_cost_function_to_dataset(f_cost, valid_X)
# record it
logger.append(['Valid:', trunc(valid_costs), '\t'])
with open(valid_convergence, 'a') as f:
f.write("{0!s},".format(valid_costs))
f.write("\n")
#test
test_costs = apply_cost_function_to_dataset(f_cost, test_X)
# record it
logger.append(['Test:', trunc(test_costs), '\t'])
with open(test_convergence, 'a') as f:
f.write("{0!s},".format(test_costs))
f.write("\n")
#check for early stopping
cost = numpy.sum(valid_costs)
if cost < best_cost * state.early_stop_threshold:
patience = 0
best_cost = cost
# save the parameters that made it the best
best_params = save_params(params)
else:
patience += 1
if counter >= n_epoch or patience >= state.early_stop_length:
STOP = True
if best_params is not None:
restore_params(params, best_params)
save_params_to_file('all', counter, params)
timing = time.time() - t
times.append(timing)
logger.append('time: ' + make_time_units_string(timing) + '\t')
logger.log('remaining: ' +
make_time_units_string((n_epoch - counter) *
numpy.mean(times)))
if (counter % state.save_frequency) == 0 or STOP is True:
n_examples = 100
nums = test_X.get_value(borrow=True)[range(n_examples)]
noisy_nums = f_noise(
test_X.get_value(borrow=True)[range(n_examples)])
reconstructions = []
for i in xrange(0, len(noisy_nums)):
recon = f_recon(noisy_nums[max(0, (i + 1) -
batch_size):i + 1])
reconstructions.append(recon)
reconstructed = numpy.array(reconstructions)
# Concatenate stuff
stacked = numpy.vstack([
numpy.vstack([
nums[i * 10:(i + 1) * 10],
noisy_nums[i * 10:(i + 1) * 10],
reconstructed[i * 10:(i + 1) * 10]
]) for i in range(10)
])
number_reconstruction = PIL.Image.fromarray(
tile_raster_images(stacked,
(root_N_input, root_N_input),
(10, 30)))
number_reconstruction.save(
outdir + 'rnngsn_number_reconstruction_epoch_' +
str(counter) + '.png')
#sample_numbers(counter, 'seven')
plot_samples(counter, 'rnngsn')
#save params
save_params_to_file('all', counter, params)
# ANNEAL!
new_lr = learning_rate.get_value() * annealing
learning_rate.set_value(new_lr)
# 10k samples
print 'Generating 10,000 samples'
samples, _ = sample_some_numbers(N=10000)
f_samples = outdir + 'samples.npy'
numpy.save(f_samples, samples)
print 'saved digits'
def train_GSN(train_X, train_Y, valid_X, valid_Y, test_X, test_Y):
logger.log("\n-----------TRAINING GSN------------\n")
# TRAINING
n_epoch = state.n_epoch
batch_size = state.gsn_batch_size
STOP = False
counter = 0
learning_rate.set_value(cast32(state.learning_rate)) # learning rate
times = []
best_cost = float('inf')
best_params = None
patience = 0
logger.log(['train X size:',str(train_X.shape.eval())])
logger.log(['valid X size:',str(valid_X.shape.eval())])
logger.log(['test X size:',str(test_X.shape.eval())])
if state.vis_init:
bias_list[0].set_value(logit(numpy.clip(0.9,0.001,train_X.get_value().mean(axis=0))))
if state.test_model:
# If testing, do not train and go directly to generating samples, parzen window estimation, and inpainting
logger.log('Testing : skip training')
STOP = True
while not STOP:
counter += 1
t = time.time()
logger.append([counter,'\t'])
#shuffle the data
data.sequence_mnist_data(train_X, train_Y, valid_X, valid_Y, test_X, test_Y, dataset, rng)
#train
train_costs = []
for i in xrange(len(train_X.get_value(borrow=True)) / batch_size):
x = train_X.get_value()[i * batch_size : (i+1) * batch_size]
cost = f_learn_gsn(x)
train_costs.append([cost])
train_costs = numpy.mean(train_costs)
# record it
logger.append(['Train:',trunc(train_costs),'\t'])
with open(gsn_train_convergence,'a') as f:
f.write("{0!s},".format(train_costs))
f.write("\n")
#valid
valid_costs = []
for i in xrange(len(valid_X.get_value(borrow=True)) / batch_size):
x = valid_X.get_value()[i * batch_size : (i+1) * batch_size]
cost = f_cost_gsn(x)
valid_costs.append([cost])
valid_costs = numpy.mean(valid_costs)
# record it
logger.append(['Valid:',trunc(valid_costs), '\t'])
with open(gsn_valid_convergence,'a') as f:
f.write("{0!s},".format(valid_costs))
f.write("\n")
#test
test_costs = []
for i in xrange(len(test_X.get_value(borrow=True)) / batch_size):
x = test_X.get_value()[i * batch_size : (i+1) * batch_size]
cost = f_cost_gsn(x)
test_costs.append([cost])
test_costs = numpy.mean(test_costs)
# record it
logger.append(['Test:',trunc(test_costs), '\t'])
with open(gsn_test_convergence,'a') as f:
f.write("{0!s},".format(test_costs))
f.write("\n")
#check for early stopping
cost = numpy.sum(valid_costs)
if cost < best_cost*state.early_stop_threshold:
patience = 0
best_cost = cost
# save the parameters that made it the best
best_params = save_params(gsn_params)
else:
patience += 1
if counter >= n_epoch or patience >= state.early_stop_length:
STOP = True
if best_params is not None:
restore_params(gsn_params, best_params)
save_params_to_file('gsn', counter, gsn_params)
timing = time.time() - t
times.append(timing)
logger.append('time: '+make_time_units_string(timing)+'\t')
logger.log('remaining: '+make_time_units_string((n_epoch - counter) * numpy.mean(times)))
if (counter % state.save_frequency) == 0 or STOP is True:
n_examples = 100
random_idx = numpy.array(R.sample(range(len(test_X.get_value(borrow=True))), n_examples))
numbers = test_X.get_value(borrow=True)[random_idx]
noisy_numbers = f_noise(test_X.get_value(borrow=True)[random_idx])
reconstructed = f_recon_gsn(noisy_numbers)
# Concatenate stuff
stacked = numpy.vstack([numpy.vstack([numbers[i*10 : (i+1)*10], noisy_numbers[i*10 : (i+1)*10], reconstructed[i*10 : (i+1)*10]]) for i in range(10)])
number_reconstruction = PIL.Image.fromarray(tile_raster_images(stacked, (root_N_input,root_N_input), (10,30)))
number_reconstruction.save(outdir+'gsn_number_reconstruction_epoch_'+str(counter)+'.png')
#sample_numbers(counter, 'seven')
plot_samples(counter, 'gsn')
#save gsn_params
save_params_to_file('gsn', counter, gsn_params)
# ANNEAL!
new_lr = learning_rate.get_value() * annealing
learning_rate.set_value(new_lr)
# 10k samples
print 'Generating 10,000 samples'
samples, _ = sample_some_numbers(N=10000)
f_samples = outdir+'samples.npy'
numpy.save(f_samples, samples)
print 'saved digits'
def experiment(state, outdir_base='./'):
rng.seed(1) #seed the numpy random generator
# Initialize output directory and files
data.mkdir_p(outdir_base)
outdir = outdir_base + "/" + state.dataset + "/"
data.mkdir_p(outdir)
logfile = outdir + "log.txt"
with open(logfile, 'w') as f:
f.write("MODEL 2, {0!s}\n\n".format(state.dataset))
train_convergence_pre = outdir + "train_convergence_pre.csv"
train_convergence_post = outdir + "train_convergence_post.csv"
valid_convergence_pre = outdir + "valid_convergence_pre.csv"
valid_convergence_post = outdir + "valid_convergence_post.csv"
test_convergence_pre = outdir + "test_convergence_pre.csv"
test_convergence_post = outdir + "test_convergence_post.csv"
print
print "----------MODEL 2, {0!s}--------------".format(state.dataset)
print
#load parameters from config file if this is a test
config_filename = outdir + 'config'
if state.test_model and 'config' in os.listdir(outdir):
config_vals = load_from_config(config_filename)
for CV in config_vals:
print CV
if CV.startswith('test'):
print 'Do not override testing switch'
continue
try:
exec('state.' + CV) in globals(), locals()
except:
exec('state.' + CV.split('=')[0] + "='" + CV.split('=')[1] +
"'") in globals(), locals()
else:
# Save the current configuration
# Useful for logs/experiments
print 'Saving config'
with open(config_filename, 'w') as f:
f.write(str(state))
print state
# Load the data, train = train+valid, and sequence
artificial = False
if state.dataset == 'MNIST_1' or state.dataset == 'MNIST_2' or state.dataset == 'MNIST_3':
(train_X,
train_Y), (valid_X,
valid_Y), (test_X,
test_Y) = data.load_mnist(state.data_path)
train_X = numpy.concatenate((train_X, valid_X))
train_Y = numpy.concatenate((train_Y, valid_Y))
artificial = True
try:
dataset = int(state.dataset.split('_')[1])
except:
raise AssertionError(
"artificial dataset number not recognized. Input was " +
state.dataset)
else:
raise AssertionError("dataset not recognized.")
train_X = theano.shared(train_X)
train_Y = theano.shared(train_Y)
valid_X = theano.shared(valid_X)
valid_Y = theano.shared(valid_Y)
test_X = theano.shared(test_X)
test_Y = theano.shared(test_Y)
if artificial:
print 'Sequencing MNIST data...'
print 'train set size:', len(train_Y.eval())
print 'valid set size:', len(valid_Y.eval())
print 'test set size:', len(test_Y.eval())
data.sequence_mnist_data(train_X, train_Y, valid_X, valid_Y, test_X,
test_Y, dataset, rng)
print 'train set size:', len(train_Y.eval())
print 'valid set size:', len(valid_Y.eval())
print 'test set size:', len(test_Y.eval())
print 'Sequencing done.'
print
N_input = train_X.eval().shape[1]
root_N_input = numpy.sqrt(N_input)
# Network and training specifications
layers = state.layers # number hidden layers
walkbacks = state.walkbacks # number of walkbacks
layer_sizes = [
N_input
] + [state.hidden_size
] * layers # layer sizes, from h0 to hK (h0 is the visible layer)
learning_rate = theano.shared(cast32(state.learning_rate)) # learning rate
annealing = cast32(state.annealing) # exponential annealing coefficient
momentum = theano.shared(cast32(state.momentum)) # momentum term
# PARAMETERS : weights list and bias list.
# initialize a list of weights and biases based on layer_sizes
weights_list = [
get_shared_weights(layer_sizes[i],
layer_sizes[i + 1],
name="W_{0!s}_{1!s}".format(i, i + 1))
for i in range(layers)
] # initialize each layer to uniform sample from sqrt(6. / (n_in + n_out))
recurrent_weights_list = [
get_shared_weights(layer_sizes[i + 1],
layer_sizes[i],
name="V_{0!s}_{1!s}".format(i + 1, i))
for i in range(layers)
] # initialize each layer to uniform sample from sqrt(6. / (n_in + n_out))
bias_list = [
get_shared_bias(layer_sizes[i], name='b_' + str(i))
for i in range(layers + 1)
] # initialize each layer to 0's.
# Theano variables and RNG
MRG = RNG_MRG.MRG_RandomStreams(1)
X = T.fmatrix('X')
Xs = [
T.fmatrix(name="X_initial") if i == 0 else T.fmatrix(name="X_" +
str(i + 1))
for i in range(walkbacks + 1)
]
hiddens_input = [X] + [
T.fmatrix(name="h_" + str(i + 1)) for i in range(layers)
]
hiddens_output = hiddens_input[:1] + hiddens_input[1:]
# Check variables for bad inputs and stuff
if state.batch_size > len(Xs):
warnings.warn(
"Batch size should not be bigger than walkbacks+1 (len(Xs)) unless you know what you're doing. You need to know the sequence length beforehand."
)
if state.batch_size <= 0:
raise AssertionError("batch size cannot be <= 0")
''' F PROP '''
if state.hidden_act == 'sigmoid':
print 'Using sigmoid activation for hiddens'
hidden_activation = T.nnet.sigmoid
elif state.hidden_act == 'rectifier':
print 'Using rectifier activation for hiddens'
hidden_activation = lambda x: T.maximum(cast32(0), x)
elif state.hidden_act == 'tanh':
print 'Using hyperbolic tangent activation for hiddens'
hidden_activation = lambda x: T.tanh(x)
else:
raise AssertionError(
"Did not recognize hidden activation {0!s}, please use tanh, rectifier, or sigmoid"
.format(state.hidden_act))
if state.visible_act == 'sigmoid':
print 'Using sigmoid activation for visible layer'
visible_activation = T.nnet.sigmoid
elif state.visible_act == 'softmax':
print 'Using softmax activation for visible layer'
visible_activation = T.nnet.softmax
else:
raise AssertionError(
"Did not recognize visible activation {0!s}, please use sigmoid or softmax"
.format(state.visible_act))
def update_layers(hiddens,
p_X_chain,
Xs,
sequence_idx,
noisy=True,
sampling=True):
print 'odd layer updates'
update_odd_layers(hiddens, noisy)
print 'even layer updates'
update_even_layers(hiddens, p_X_chain, Xs, sequence_idx, noisy,
sampling)
# choose the correct output for hidden_outputs based on batch_size and walkbacks (this is due to an issue with batches, see note in run_story2.py)
if state.batch_size <= len(
Xs) and sequence_idx == state.batch_size - 1:
return hiddens
else:
return None
print 'done full update.'
print
# Odd layer update function
# just a loop over the odd layers
def update_odd_layers(hiddens, noisy):
for i in range(1, len(hiddens), 2):
print 'updating layer', i
simple_update_layer(hiddens, None, None, None, i, add_noise=noisy)
# Even layer update
# p_X_chain is given to append the p(X|...) at each full update (one update = odd update + even update)
def update_even_layers(hiddens, p_X_chain, Xs, sequence_idx, noisy,
sampling):
for i in range(0, len(hiddens), 2):
print 'updating layer', i
simple_update_layer(hiddens,
p_X_chain,
Xs,
sequence_idx,
i,
add_noise=noisy,
input_sampling=sampling)
# The layer update function
# hiddens : list containing the symbolic theano variables [visible, hidden1, hidden2, ...]
# layer_update will modify this list inplace
# p_X_chain : list containing the successive p(X|...) at each update
# update_layer will append to this list
# add_noise : pre and post activation gaussian noise
def simple_update_layer(hiddens,
p_X_chain,
Xs,
sequence_idx,
i,
add_noise=True,
input_sampling=True):
# Compute the dot product, whatever layer
# If the visible layer X
if i == 0:
print 'using', recurrent_weights_list[i]
hiddens[i] = (T.dot(hiddens[i + 1], recurrent_weights_list[i]) +
bias_list[i])
# If the top layer
elif i == len(hiddens) - 1:
print 'using', weights_list[i - 1]
hiddens[i] = T.dot(hiddens[i - 1],
weights_list[i - 1]) + bias_list[i]
# Otherwise in-between layers
else:
# next layer : hiddens[i+1], assigned weights : W_i
# previous layer : hiddens[i-1], assigned weights : W_(i-1)
print "using {0!s} and {1!s}".format(weights_list[i - 1],
recurrent_weights_list[i])
hiddens[i] = T.dot(
hiddens[i + 1], recurrent_weights_list[i]) + T.dot(
hiddens[i - 1], weights_list[i - 1]) + bias_list[i]
# Add pre-activation noise if NOT input layer
if i == 1 and state.noiseless_h1:
print '>>NO noise in first hidden layer'
add_noise = False
# pre activation noise
if i != 0 and add_noise:
print 'Adding pre-activation gaussian noise for layer', i
hiddens[i] = add_gaussian_noise(hiddens[i],
state.hidden_add_noise_sigma)
# ACTIVATION!
if i == 0:
print 'Sigmoid units activation for visible layer X'
hiddens[i] = visible_activation(hiddens[i])
else:
print 'Hidden units {} activation for layer'.format(state.act), i
hiddens[i] = hidden_activation(hiddens[i])
# post activation noise
# why is there post activation noise? Because there is already pre-activation noise, this just doubles the amount of noise between each activation of the hiddens.
# if i != 0 and add_noise:
# print 'Adding post-activation gaussian noise for layer', i
# hiddens[i] = add_gaussian(hiddens[i], state.hidden_add_noise_sigma)
# build the reconstruction chain if updating the visible layer X
if i == 0:
# if input layer -> append p(X|...)
p_X_chain.append(
hiddens[i]) #what the predicted next input should be
if sequence_idx + 1 < len(Xs):
next_input = Xs[sequence_idx + 1]
# sample from p(X|...) - SAMPLING NEEDS TO BE CORRECT FOR INPUT TYPES I.E. FOR BINARY MNIST SAMPLING IS BINOMIAL. real-valued inputs should be gaussian
if input_sampling:
print 'Sampling from input'
sampled = MRG.binomial(p=next_input,
size=next_input.shape,
dtype='float32')
else:
print '>>NO input sampling'
sampled = next_input
# add noise
sampled = salt_and_pepper(sampled, state.input_salt_and_pepper)
# DOES INPUT SAMPLING MAKE SENSE FOR SEQUENTIAL? - not really since it was used in walkbacks which was gibbs.
# set input layer
hiddens[i] = sampled
def build_graph(hiddens, Xs, noisy=True, sampling=True):
predicted_X_chain = [
] # the visible layer that gets generated at each update_layers run
H_chain = [
] # either None or hiddens that gets generated at each update_layers run, this is used to determine what the correct hiddens_output should be
print "Building the graph :", walkbacks, "updates"
for i in range(walkbacks):
print "Forward Prediction {!s}/{!s}".format(i + 1, walkbacks)
H_chain.append(
update_layers(hiddens, predicted_X_chain, Xs, i, noisy,
sampling))
return predicted_X_chain, H_chain
'''Build the main training graph'''
# corrupt x
hiddens_output[0] = salt_and_pepper(hiddens_output[0],
state.input_salt_and_pepper)
# build the computation graph and the generated visible layers and appropriate hidden_output
predicted_X_chain, H_chain = build_graph(hiddens_output,
Xs,
noisy=True,
sampling=state.input_sampling)
# predicted_X_chain, H_chain = build_graph(hiddens_output, Xs, noisy=False, sampling=state.input_sampling) #testing one-hot without noise
# choose the correct output for hiddens_output (this is due to the issue with batches - see note in run_story2.py)
# this finds the not-None element of H_chain and uses that for hiddens_output
h_empty = [True if h is None else False for h in H_chain]
if False in h_empty: # if there was a not-None element
hiddens_output = H_chain[h_empty.index(
False
)] # set hiddens_output to the appropriate element from H_chain
######################
# COST AND GRADIENTS #
######################
print
if state.cost_funct == 'binary_crossentropy':
print 'Using binary cross-entropy cost!'
cost_function = lambda x, y: T.mean(T.nnet.binary_crossentropy(x, y))
elif state.cost_funct == 'square':
print "Using square error cost!"
cost_function = lambda x, y: T.mean(T.sqr(x - y))
else:
raise AssertionError(
"Did not recognize cost function {0!s}, please use binary_crossentropy or square"
.format(state.cost_funct))
print 'Cost w.r.t p(X|...) at every step in the graph'
costs = [
cost_function(predicted_X_chain[i], Xs[i + 1])
for i in range(len(predicted_X_chain))
]
# outputs for the functions
show_COSTs = [costs[0]] + [costs[-1]]
# cost for the gradient
# care more about the immediate next predictions rather than the future - use exponential decay
# COST = T.sum(costs)
COST = T.sum([
T.exp(-i / T.ceil(walkbacks / 3)) * costs[i] for i in range(len(costs))
])
params = weights_list + recurrent_weights_list + bias_list
print "params:", params
print "creating functions..."
gradient = T.grad(COST, params)
gradient_buffer = [
theano.shared(numpy.zeros(param.get_value().shape, dtype='float32'))
for param in params
]
m_gradient = [
momentum * gb + (cast32(1) - momentum) * g
for (gb, g) in zip(gradient_buffer, gradient)
]
param_updates = [(param, param - learning_rate * mg)
for (param, mg) in zip(params, m_gradient)]
gradient_buffer_updates = zip(gradient_buffer, m_gradient)
updates = OrderedDict(param_updates + gradient_buffer_updates)
#odd layer h's not used from input -> calculated directly from even layers (starting with h_0) since the odd layers are updated first.
f_cost = theano.function(inputs=hiddens_input + Xs,
outputs=hiddens_output + show_COSTs,
on_unused_input='warn')
f_learn = theano.function(inputs=hiddens_input + Xs,
updates=updates,
outputs=hiddens_output + show_COSTs,
on_unused_input='warn')
print "functions done."
print
#############
# Denoise some numbers : show number, noisy number, reconstructed number
#############
import random as R
R.seed(1)
# a function to add salt and pepper noise
f_noise = theano.function(inputs=[X],
outputs=salt_and_pepper(
X, state.input_salt_and_pepper))
# Recompile the graph without noise for reconstruction function - the input x_recon is already going to be noisy, and this is to test on a simulated 'real' input.
X_recon = T.fvector("X_recon")
Xs_recon = [T.fvector("Xs_recon")]
hiddens_R_input = [X_recon] + [
T.fvector(name="h_recon_" + str(i + 1)) for i in range(layers)
]
hiddens_R_output = hiddens_R_input[:1] + hiddens_R_input[1:]
# The layer update scheme
print "Creating graph for noisy reconstruction function at checkpoints during training."
p_X_chain_R, H_chain_R = build_graph(hiddens_R_output,
Xs_recon,
noisy=False)
# choose the correct output from H_chain for hidden_outputs based on batch_size and walkbacks
# choose the correct output for hiddens_output
h_empty = [True if h is None else False for h in H_chain_R]
if False in h_empty: # if there was a set of hiddens output from the batch_size-1 element of the chain
hiddens_R_output = H_chain_R[h_empty.index(
False
)] # extract out the not-None element from the list if it exists
# if state.batch_size <= len(Xs_recon):
# for i in range(len(hiddens_R_output)):
# hiddens_R_output[i] = H_chain_R[state.batch_size - 1][i]
f_recon = theano.function(inputs=hiddens_R_input + Xs_recon,
outputs=hiddens_R_output +
[p_X_chain_R[0], p_X_chain_R[-1]],
on_unused_input="warn")
############
# Sampling #
############
# the input to the sampling function
X_sample = T.fmatrix("X_sampling")
network_state_input = [X_sample] + [
T.fmatrix("H_sampling_" + str(i + 1)) for i in range(layers)
]
# "Output" state of the network (noisy)
# initialized with input, then we apply updates
network_state_output = [X_sample] + network_state_input[1:]
visible_pX_chain = []
# ONE update
print "Performing one walkback in network state sampling."
_ = update_layers(network_state_output,
visible_pX_chain, [X_sample],
0,
noisy=True)
if layers == 1:
f_sample_simple = theano.function(inputs=[X_sample],
outputs=visible_pX_chain[-1])
# WHY IS THERE A WARNING????
# because the first odd layers are not used -> directly computed FROM THE EVEN layers
# unused input = warn
f_sample2 = theano.function(inputs=network_state_input,
outputs=network_state_output +
visible_pX_chain,
on_unused_input='warn')
def sample_some_numbers_single_layer():
x0 = test_X.get_value()[:1]
samples = [x0]
x = f_noise(x0)
for i in range(399):
x = f_sample_simple(x)
samples.append(x)
x = numpy.random.binomial(n=1, p=x, size=x.shape).astype('float32')
x = f_noise(x)
return numpy.vstack(samples)
def sampling_wrapper(NSI):
# * is the "splat" operator: It takes a list as input, and expands it into actual positional arguments in the function call.
out = f_sample2(*NSI)
NSO = out[:len(network_state_output)]
vis_pX_chain = out[len(network_state_output):]
return NSO, vis_pX_chain
def sample_some_numbers(N=400):
# The network's initial state
init_vis = test_X.get_value()[:1]
noisy_init_vis = f_noise(init_vis)
network_state = [[noisy_init_vis] + [
numpy.zeros((1, len(b.get_value())), dtype='float32')
for b in bias_list[1:]
]]
visible_chain = [init_vis]
noisy_h0_chain = [noisy_init_vis]
for i in range(N - 1):
# feed the last state into the network, compute new state, and obtain visible units expectation chain
net_state_out, vis_pX_chain = sampling_wrapper(network_state[-1])
# append to the visible chain
visible_chain += vis_pX_chain
# append state output to the network state chain
network_state.append(net_state_out)
noisy_h0_chain.append(net_state_out[0])
return numpy.vstack(visible_chain), numpy.vstack(noisy_h0_chain)
def plot_samples(epoch_number, iteration):
to_sample = time.time()
if layers == 1:
# one layer model
V = sample_some_numbers_single_layer()
else:
V, H0 = sample_some_numbers()
img_samples = PIL.Image.fromarray(
tile_raster_images(V, (root_N_input, root_N_input), (20, 20)))
fname = outdir + 'samples_iteration_' + str(
iteration) + '_epoch_' + str(epoch_number) + '.png'
img_samples.save(fname)
print 'Took ' + str(time.time() - to_sample) + ' to sample 400 numbers'
##############
# Inpainting #
##############
def inpainting(digit):
# The network's initial state
# NOISE INIT
init_vis = cast32(numpy.random.uniform(size=digit.shape))
#noisy_init_vis = f_noise(init_vis)
#noisy_init_vis = cast32(numpy.random.uniform(size=init_vis.shape))
# INDEXES FOR VISIBLE AND NOISY PART
noise_idx = (numpy.arange(N_input) % root_N_input < (root_N_input / 2))
fixed_idx = (numpy.arange(N_input) % root_N_input > (root_N_input / 2))
# function to re-init the visible to the same noise
# FUNCTION TO RESET HALF VISIBLE TO DIGIT
def reset_vis(V):
V[0][fixed_idx] = digit[0][fixed_idx]
return V
# INIT DIGIT : NOISE and RESET HALF TO DIGIT
init_vis = reset_vis(init_vis)
network_state = [[init_vis] + [
numpy.zeros((1, len(b.get_value())), dtype='float32')
for b in bias_list[1:]
]]
visible_chain = [init_vis]
noisy_h0_chain = [init_vis]
for i in range(49):
# feed the last state into the network, compute new state, and obtain visible units expectation chain
net_state_out, vis_pX_chain = sampling_wrapper(network_state[-1])
# reset half the digit
net_state_out[0] = reset_vis(net_state_out[0])
vis_pX_chain[0] = reset_vis(vis_pX_chain[0])
# append to the visible chain
visible_chain += vis_pX_chain
# append state output to the network state chain
network_state.append(net_state_out)
noisy_h0_chain.append(net_state_out[0])
return numpy.vstack(visible_chain), numpy.vstack(noisy_h0_chain)
def save_params_to_file(name, n, params, iteration):
print 'saving parameters...'
save_path = outdir + name + '_params_iteration_' + str(
iteration) + '_epoch_' + str(n) + '.pkl'
f = open(save_path, 'wb')
try:
cPickle.dump(params, f, protocol=cPickle.HIGHEST_PROTOCOL)
finally:
f.close()
################
# GSN TRAINING #
################
def train_recurrent_GSN(iteration, train_X, train_Y, valid_X, valid_Y,
test_X, test_Y):
print '----------------------------------------'
print 'TRAINING GSN FOR ITERATION', iteration
with open(logfile, 'a') as f:
f.write(
"--------------------------\nTRAINING GSN FOR ITERATION {0!s}\n"
.format(iteration))
# TRAINING
n_epoch = state.n_epoch
batch_size = state.batch_size
STOP = False
counter = 0
if iteration == 0:
learning_rate.set_value(cast32(
state.learning_rate)) # learning rate
times = []
best_cost = float('inf')
patience = 0
print 'learning rate:', learning_rate.get_value()
print 'train X size:', str(train_X.shape.eval())
print 'valid X size:', str(valid_X.shape.eval())
print 'test X size:', str(test_X.shape.eval())
train_costs = []
valid_costs = []
test_costs = []
train_costs_post = []
valid_costs_post = []
test_costs_post = []
if state.vis_init:
bias_list[0].set_value(
logit(numpy.clip(0.9, 0.001,
train_X.get_value().mean(axis=0))))
if state.test_model:
# If testing, do not train and go directly to generating samples, parzen window estimation, and inpainting
print 'Testing : skip training'
STOP = True
while not STOP:
counter += 1
t = time.time()
print counter, '\t',
with open(logfile, 'a') as f:
f.write("{0!s}\t".format(counter))
#shuffle the data
data.sequence_mnist_data(train_X, train_Y, valid_X, valid_Y,
test_X, test_Y, dataset, rng)
#train
#init hiddens
# hiddens = [(T.zeros_like(train_X[:batch_size]).eval())]
# for i in range(len(weights_list)):
# # init with zeros
# hiddens.append(T.zeros_like(T.dot(hiddens[i], weights_list[i])).eval())
hiddens = [
T.zeros((batch_size, layer_size)).eval()
for layer_size in layer_sizes
]
train_cost = []
train_cost_post = []
for i in range(len(train_X.get_value(borrow=True)) / batch_size):
xs = [
train_X.get_value(
borrow=True)[(i * batch_size) +
sequence_idx:((i + 1) * batch_size) +
sequence_idx]
for sequence_idx in range(len(Xs))
]
xs, hiddens = fix_input_size(xs, hiddens)
hiddens[0] = xs[0]
_ins = hiddens + xs
_outs = f_learn(*_ins)
hiddens = _outs[:len(hiddens)]
cost = _outs[-2]
cost_post = _outs[-1]
train_cost.append(cost)
train_cost_post.append(cost_post)
train_cost = numpy.mean(train_cost)
train_costs.append(train_cost)
train_cost_post = numpy.mean(train_cost_post)
train_costs_post.append(train_cost_post)
print 'Train : ', trunc(train_cost), trunc(train_cost_post), '\t',
with open(logfile, 'a') as f:
f.write("Train : {0!s} {1!s}\t".format(trunc(train_cost),
trunc(train_cost_post)))
with open(train_convergence_pre, 'a') as f:
f.write("{0!s},".format(train_cost))
with open(train_convergence_post, 'a') as f:
f.write("{0!s},".format(train_cost_post))
#valid
#init hiddens
hiddens = [
T.zeros((batch_size, layer_size)).eval()
for layer_size in layer_sizes
]
valid_cost = []
valid_cost_post = []
for i in range(len(valid_X.get_value(borrow=True)) / batch_size):
xs = [
valid_X.get_value(
borrow=True)[(i * batch_size) +
sequence_idx:((i + 1) * batch_size) +
sequence_idx]
for sequence_idx in range(len(Xs))
]
xs, hiddens = fix_input_size(xs, hiddens)
hiddens[0] = xs[0]
_ins = hiddens + xs
_outs = f_cost(*_ins)
hiddens = _outs[:-2]
cost = _outs[-2]
cost_post = _outs[-1]
valid_cost.append(cost)
valid_cost_post.append(cost_post)
valid_cost = numpy.mean(valid_cost)
valid_costs.append(valid_cost)
valid_cost_post = numpy.mean(valid_cost_post)
valid_costs_post.append(valid_cost_post)
print 'Valid : ', trunc(valid_cost), trunc(valid_cost_post), '\t',
with open(logfile, 'a') as f:
f.write("Valid : {0!s} {1!s}\t".format(trunc(valid_cost),
trunc(valid_cost_post)))
with open(valid_convergence_pre, 'a') as f:
f.write("{0!s},".format(valid_cost))
with open(valid_convergence_post, 'a') as f:
f.write("{0!s},".format(valid_cost_post))
#test
#init hiddens
hiddens = [
T.zeros((batch_size, layer_size)).eval()
for layer_size in layer_sizes
]
test_cost = []
test_cost_post = []
for i in range(len(test_X.get_value(borrow=True)) / batch_size):
xs = [
test_X.get_value(
borrow=True)[(i * batch_size) +
sequence_idx:((i + 1) * batch_size) +
sequence_idx]
for sequence_idx in range(len(Xs))
]
xs, hiddens = fix_input_size(xs, hiddens)
hiddens[0] = xs[0]
_ins = hiddens + xs
_outs = f_cost(*_ins)
hiddens = _outs[:-2]
cost = _outs[-2]
cost_post = _outs[-1]
test_cost.append(cost)
test_cost_post.append(cost_post)
test_cost = numpy.mean(test_cost)
test_costs.append(test_cost)
test_cost_post = numpy.mean(test_cost_post)
test_costs_post.append(test_cost_post)
print 'Test : ', trunc(test_cost), trunc(test_cost_post), '\t',
with open(logfile, 'a') as f:
f.write("Test : {0!s} {1!s}\t".format(trunc(test_cost),
trunc(test_cost_post)))
with open(test_convergence_pre, 'a') as f:
f.write("{0!s},".format(test_cost))
with open(test_convergence_post, 'a') as f:
f.write("{0!s},".format(test_cost_post))
#check for early stopping
cost = train_cost
if cost < best_cost * state.early_stop_threshold:
patience = 0
best_cost = cost
else:
patience += 1
if counter >= n_epoch or patience >= state.early_stop_length:
STOP = True
save_params_to_file('gsn', counter, params, iteration)
timing = time.time() - t
times.append(timing)
print 'time : ', trunc(timing),
print 'remaining: ', trunc(
(n_epoch - counter) * numpy.mean(times) / 60 / 60), 'hrs',
print 'B : ', [
trunc(abs(b.get_value(borrow=True)).mean()) for b in bias_list
],
print 'W : ', [
trunc(abs(w.get_value(borrow=True)).mean())
for w in weights_list
],
print 'V : ', [
trunc(abs(v.get_value(borrow=True)).mean())
for v in recurrent_weights_list
]
with open(logfile, 'a') as f:
f.write("MeanVisB : {0!s}\t".format(
trunc(bias_list[0].get_value().mean())))
with open(logfile, 'a') as f:
f.write("W : {0!s}\t".format(
str([
trunc(abs(w.get_value(borrow=True)).mean())
for w in weights_list
])))
with open(logfile, 'a') as f:
f.write("Time : {0!s} seconds\n".format(trunc(timing)))
if (counter % state.save_frequency) == 0:
# Checking reconstruction
nums = test_X.get_value()[range(100)]
noisy_nums = f_noise(test_X.get_value()[range(100)])
reconstructed_prediction = []
reconstructed_prediction_end = []
#init reconstruction hiddens
hiddens = [
T.zeros(layer_size).eval() for layer_size in layer_sizes
]
for num in noisy_nums:
hiddens[0] = num
for i in range(len(hiddens)):
if len(hiddens[i].shape
) == 2 and hiddens[i].shape[0] == 1:
hiddens[i] = hiddens[i][0]
_ins = hiddens + [num]
_outs = f_recon(*_ins)
hiddens = _outs[:len(hiddens)]
[reconstructed_1, reconstructed_n] = _outs[len(hiddens):]
reconstructed_prediction.append(reconstructed_1)
reconstructed_prediction_end.append(reconstructed_n)
with open(logfile, 'a') as f:
f.write("\n")
for i in range(len(nums)):
if len(
reconstructed_prediction[i].shape
) == 2 and reconstructed_prediction[i].shape[0] == 1:
reconstructed_prediction[i] = reconstructed_prediction[
i][0]
print nums[i].tolist(
), "->", reconstructed_prediction[i].tolist()
with open(logfile, 'a') as f:
f.write("{0!s} -> {1!s}\n".format(
nums[i].tolist(), [
trunc(n)
if n > 0.0001 else trunc(0.00000000000000000)
for n in reconstructed_prediction[i].tolist()
]))
with open(logfile, 'a') as f:
f.write("\n")
# # Concatenate stuff
# stacked = numpy.vstack([numpy.vstack([nums[i*10 : (i+1)*10], noisy_nums[i*10 : (i+1)*10], reconstructed_prediction[i*10 : (i+1)*10], reconstructed_prediction_end[i*10 : (i+1)*10]]) for i in range(10)])
# numbers_reconstruction = PIL.Image.fromarray(tile_raster_images(stacked, (root_N_input,root_N_input), (10,40)))
# numbers_reconstruction.save(outdir+'gsn_number_reconstruction_iteration_'+str(iteration)+'_epoch_'+str(counter)+'.png')
#
# #sample_numbers(counter, 'seven')
# plot_samples(counter, iteration)
#
# #save params
# save_params_to_file('gsn', counter, params, iteration)
# ANNEAL!
new_lr = learning_rate.get_value() * annealing
learning_rate.set_value(new_lr)
# 10k samples
print 'Generating 10,000 samples'
samples, _ = sample_some_numbers(N=10000)
f_samples = outdir + 'samples.npy'
numpy.save(f_samples, samples)
print 'saved digits'
#####################
# STORY 2 ALGORITHM #
#####################
for iter in range(state.max_iterations):
train_recurrent_GSN(iter, train_X, train_Y, valid_X, valid_Y, test_X,
test_Y)
def train(self, train_X=None, train_Y=None, valid_X=None, valid_Y=None, test_X=None, test_Y=None, is_artificial=False, artificial_sequence=1, continue_training=False):
log.maybeLog(self.logger, "\nTraining---------\n")
if train_X is None:
log.maybeLog(self.logger, "Training using data given during initialization of RNN-GSN.\n")
train_X = self.train_X
train_Y = self.train_Y
if train_X is None:
log.maybeLog(self.logger, "\nPlease provide a training dataset!\n")
raise AssertionError("Please provide a training dataset!")
else:
log.maybeLog(self.logger, "Training using data provided to training function.\n")
if valid_X is None:
valid_X = self.valid_X
valid_Y = self.valid_Y
if test_X is None:
test_X = self.test_X
test_Y = self.test_Y
##########################################################
# Train the GSN first to get good weights initialization #
##########################################################
if self.train_gsn_first:
log.maybeLog(self.logger, "\n\n----------Initially training the GSN---------\n\n")
init_gsn = generative_stochastic_network.GSN(train_X=train_X, valid_X=valid_X, test_X=test_X, args=self.gsn_args, logger=self.logger)
init_gsn.train()
#############################
# Save the model parameters #
#############################
def save_params_to_file(name, n, gsn_params):
pass
print 'saving parameters...'
save_path = self.outdir+name+'_params_epoch_'+str(n)+'.pkl'
f = open(save_path, 'wb')
try:
cPickle.dump(gsn_params, f, protocol=cPickle.HIGHEST_PROTOCOL)
finally:
f.close()
def save_params(params):
values = [param.get_value(borrow=True) for param in params]
return values
def restore_params(params, values):
for i in range(len(params)):
params[i].set_value(values[i])
#########################################
# If we are using Hessian-free training #
#########################################
if self.hessian_free:
pass
# gradient_dataset = hf_sequence_dataset([train_X.get_value()], batch_size=None, number_batches=5000)
# cg_dataset = hf_sequence_dataset([train_X.get_value()], batch_size=None, number_batches=1000)
# valid_dataset = hf_sequence_dataset([valid_X.get_value()], batch_size=None, number_batches=1000)
#
# s = x_samples
# costs = [cost, show_cost]
# hf_optimizer(params, [Xs], s, costs, u, ua).train(gradient_dataset, cg_dataset, initial_lambda=1.0, preconditioner=True, validation=valid_dataset)
################################
# If we are using SGD training #
################################
else:
log.maybeLog(self.logger, "\n-----------TRAINING RNN-GSN------------\n")
# TRAINING
STOP = False
counter = 0
if not continue_training:
self.learning_rate.set_value(self.init_learn_rate) # learning rate
times = []
best_cost = float('inf')
best_params = None
patience = 0
log.maybeLog(self.logger, ['train X size:',str(train_X.shape.eval())])
if valid_X is not None:
log.maybeLog(self.logger, ['valid X size:',str(valid_X.shape.eval())])
if test_X is not None:
log.maybeLog(self.logger, ['test X size:',str(test_X.shape.eval())])
if self.vis_init:
self.bias_list[0].set_value(logit(numpy.clip(0.9,0.001,train_X.get_value().mean(axis=0))))
while not STOP:
counter += 1
t = time.time()
log.maybeAppend(self.logger, [counter,'\t'])
if is_artificial:
data.sequence_mnist_data(train_X, train_Y, valid_X, valid_Y, test_X, test_Y, artificial_sequence, rng)
#train
train_costs = data.apply_cost_function_to_dataset(self.f_learn, train_X, self.batch_size)
# record it
log.maybeAppend(self.logger, ['Train:',trunc(train_costs),'\t'])
#valid
valid_costs = data.apply_cost_function_to_dataset(self.f_cost, valid_X, self.batch_size)
# record it
log.maybeAppend(self.logger, ['Valid:',trunc(valid_costs), '\t'])
#test
test_costs = data.apply_cost_function_to_dataset(self.f_cost, test_X, self.batch_size)
# record it
log.maybeAppend(self.logger, ['Test:',trunc(test_costs), '\t'])
#check for early stopping
cost = numpy.sum(valid_costs)
if cost < best_cost*self.early_stop_threshold:
patience = 0
best_cost = cost
# save the parameters that made it the best
best_params = save_params(self.params)
else:
patience += 1
if counter >= self.n_epoch or patience >= self.early_stop_length:
STOP = True
if best_params is not None:
restore_params(self.params, best_params)
save_params_to_file('all', counter, self.params)
timing = time.time() - t
times.append(timing)
log.maybeAppend(self.logger, 'time: '+make_time_units_string(timing)+'\t')
log.maybeLog(self.logger, 'remaining: '+make_time_units_string((self.n_epoch - counter) * numpy.mean(times)))
if (counter % self.save_frequency) == 0 or STOP is True:
n_examples = 100
nums = test_X.get_value(borrow=True)[range(n_examples)]
noisy_nums = self.f_noise(test_X.get_value(borrow=True)[range(n_examples)])
reconstructions = []
for i in xrange(0, len(noisy_nums)):
recon = self.f_recon(noisy_nums[max(0,(i+1)-self.batch_size):i+1])
reconstructions.append(recon)
reconstructed = numpy.array(reconstructions)
# Concatenate stuff
stacked = numpy.vstack([numpy.vstack([nums[i*10 : (i+1)*10], noisy_nums[i*10 : (i+1)*10], reconstructed[i*10 : (i+1)*10]]) for i in range(10)])
number_reconstruction = PIL.Image.fromarray(tile_raster_images(stacked, (self.root_N_input,self.root_N_input), (10,30)))
number_reconstruction.save(self.outdir+'rnngsn_number_reconstruction_epoch_'+str(counter)+'.png')
#save params
save_params_to_file('all', counter, self.params)
# ANNEAL!
new_lr = self.learning_rate.get_value() * self.annealing
self.learning_rate.set_value(new_lr)
def train(self,
train_X=None,
train_Y=None,
valid_X=None,
valid_Y=None,
test_X=None,
test_Y=None,
is_artificial=False,
artificial_sequence=1,
continue_training=False):
log.maybeLog(self.logger, "\nTraining---------\n")
if train_X is None:
log.maybeLog(
self.logger,
"Training using data given during initialization of RNN-GSN.\n"
)
train_X = self.train_X
train_Y = self.train_Y
if train_X is None:
log.maybeLog(self.logger,
"\nPlease provide a training dataset!\n")
raise AssertionError("Please provide a training dataset!")
else:
log.maybeLog(
self.logger,
"Training using data provided to training function.\n")
if valid_X is None:
valid_X = self.valid_X
valid_Y = self.valid_Y
if test_X is None:
test_X = self.test_X
test_Y = self.test_Y
##########################################################
# Train the GSN first to get good weights initialization #
##########################################################
if self.train_gsn_first:
log.maybeLog(
self.logger,
"\n\n----------Initially training the GSN---------\n\n")
init_gsn = generative_stochastic_network.GSN(train_X=train_X,
valid_X=valid_X,
test_X=test_X,
args=self.gsn_args,
logger=self.logger)
init_gsn.train()
#############################
# Save the model parameters #
#############################
def save_params_to_file(name, n, gsn_params):
pass
print 'saving parameters...'
save_path = self.outdir + name + '_params_epoch_' + str(n) + '.pkl'
f = open(save_path, 'wb')
try:
cPickle.dump(gsn_params, f, protocol=cPickle.HIGHEST_PROTOCOL)
finally:
f.close()
def save_params(params):
values = [param.get_value(borrow=True) for param in params]
return values
def restore_params(params, values):
for i in range(len(params)):
params[i].set_value(values[i])
#########################################
# If we are using Hessian-free training #
#########################################
if self.hessian_free:
pass
# gradient_dataset = hf_sequence_dataset([train_X.get_value()], batch_size=None, number_batches=5000)
# cg_dataset = hf_sequence_dataset([train_X.get_value()], batch_size=None, number_batches=1000)
# valid_dataset = hf_sequence_dataset([valid_X.get_value()], batch_size=None, number_batches=1000)
#
# s = x_samples
# costs = [cost, show_cost]
# hf_optimizer(params, [Xs], s, costs, u, ua).train(gradient_dataset, cg_dataset, initial_lambda=1.0, preconditioner=True, validation=valid_dataset)
################################
# If we are using SGD training #
################################
else:
log.maybeLog(self.logger,
"\n-----------TRAINING RNN-GSN------------\n")
# TRAINING
STOP = False
counter = 0
if not continue_training:
self.learning_rate.set_value(
self.init_learn_rate) # learning rate
times = []
best_cost = float('inf')
best_params = None
patience = 0
log.maybeLog(
self.logger,
['train X size:', str(train_X.shape.eval())])
if valid_X is not None:
log.maybeLog(self.logger,
['valid X size:',
str(valid_X.shape.eval())])
if test_X is not None:
log.maybeLog(
self.logger,
['test X size:', str(test_X.shape.eval())])
if self.vis_init:
self.bias_list[0].set_value(
logit(
numpy.clip(0.9, 0.001,
train_X.get_value().mean(axis=0))))
while not STOP:
counter += 1
t = time.time()
log.maybeAppend(self.logger, [counter, '\t'])
if is_artificial:
data.sequence_mnist_data(train_X, train_Y, valid_X,
valid_Y, test_X, test_Y,
artificial_sequence, rng)
#train
train_costs = data.apply_cost_function_to_dataset(
self.f_learn, train_X, self.batch_size)
# record it
log.maybeAppend(self.logger,
['Train:', trunc(train_costs), '\t'])
#valid
valid_costs = data.apply_cost_function_to_dataset(
self.f_cost, valid_X, self.batch_size)
# record it
log.maybeAppend(self.logger,
['Valid:', trunc(valid_costs), '\t'])
#test
test_costs = data.apply_cost_function_to_dataset(
self.f_cost, test_X, self.batch_size)
# record it
log.maybeAppend(self.logger,
['Test:', trunc(test_costs), '\t'])
#check for early stopping
cost = numpy.sum(valid_costs)
if cost < best_cost * self.early_stop_threshold:
patience = 0
best_cost = cost
# save the parameters that made it the best
best_params = save_params(self.params)
else:
patience += 1
if counter >= self.n_epoch or patience >= self.early_stop_length:
STOP = True
if best_params is not None:
restore_params(self.params, best_params)
save_params_to_file('all', counter, self.params)
timing = time.time() - t
times.append(timing)
log.maybeAppend(
self.logger,
'time: ' + make_time_units_string(timing) + '\t')
log.maybeLog(
self.logger, 'remaining: ' + make_time_units_string(
(self.n_epoch - counter) * numpy.mean(times)))
if (counter % self.save_frequency) == 0 or STOP is True:
n_examples = 100
nums = test_X.get_value(borrow=True)[range(n_examples)]
noisy_nums = self.f_noise(
test_X.get_value(borrow=True)[range(n_examples)])
reconstructions = []
for i in xrange(0, len(noisy_nums)):
recon = self.f_recon(
noisy_nums[max(0, (i + 1) - self.batch_size):i +
1])
reconstructions.append(recon)
reconstructed = numpy.array(reconstructions)
# Concatenate stuff
stacked = numpy.vstack([
numpy.vstack([
nums[i * 10:(i + 1) * 10],
noisy_nums[i * 10:(i + 1) * 10],
reconstructed[i * 10:(i + 1) * 10]
]) for i in range(10)
])
number_reconstruction = PIL.Image.fromarray(
tile_raster_images(
stacked, (self.root_N_input, self.root_N_input),
(10, 30)))
number_reconstruction.save(
self.outdir + 'rnngsn_number_reconstruction_epoch_' +
str(counter) + '.png')
#save params
save_params_to_file('all', counter, self.params)
# ANNEAL!
new_lr = self.learning_rate.get_value() * self.annealing
self.learning_rate.set_value(new_lr)
