def train_and_test(args, print_config):
assert args.conv_layer_n == len(args.filter_widths) == len(
args.nkerns) == (len(args.L2_regs) - 2) == len(args.fold_flags) == len(
args.ks)
# \mod{dim, 2^{\sum fold_flags}} == 0
assert args.embed_dm % (2**sum(args.fold_flags)) == 0
###################
# get the data #
###################
datasets = load_data(args.corpus_path)
train_set_x, train_set_y = datasets[0]
dev_set_x, dev_set_y = datasets[1]
test_set_x, test_set_y = datasets[2]
word2index = datasets[3]
index2word = datasets[4]
pretrained_embeddings = datasets[5]
n_train_batches = train_set_x.get_value(
borrow=True).shape[0] / args.batch_size
n_dev_batches = dev_set_x.get_value(
borrow=True).shape[0] / args.dev_test_batch_size
n_test_batches = test_set_x.get_value(
borrow=True).shape[0] / args.dev_test_batch_size
train_sent_len = train_set_x.get_value(borrow=True).shape[1]
possible_labels = set(train_set_y.get_value().tolist())
if args.use_pretrained_embedding:
args.embed_dm = pretrained_embeddings.get_value().shape[1]
###################################
# Symbolic variable definition #
###################################
x = T.imatrix('x') # the word indices matrix
y = T.ivector('y') # the sentiment labels
batch_index = T.iscalar('batch_index')
rng = np.random.RandomState(1234)
###############################
# Construction of the network #
###############################
# Layer 1, the embedding layer
layer1 = WordEmbeddingLayer(
rng,
input=x,
vocab_size=len(word2index),
embed_dm=args.embed_dm,
embeddings=(pretrained_embeddings
if args.use_pretrained_embedding else None))
dropout_layers = [layer1]
layers = [layer1]
for i in range(args.conv_layer_n):
fold_flag = args.fold_flags[i]
# for the dropout layer
dpl = DropoutLayer(input=dropout_layers[-1].output,
rng=rng,
dropout_rate=args.dropout_rates[0])
next_layer_dropout_input = dpl.output
next_layer_input = layers[-1].output
# for the conv layer
filter_shape = (args.nkerns[i], (1 if i == 0 else args.nkerns[i - 1]),
1, args.filter_widths[i])
k = args.ks[i]
print "For conv layer(%s) %d, filter shape = %r, k = %d, dropout_rate = %f and normalized weight init: %r and fold: %d" % (
args.conv_activation_unit, i + 2, filter_shape, k,
args.dropout_rates[i], args.norm_w, fold_flag)
# we have two layers adding to two paths repsectively,
# one for training
# the other for prediction(averaged model)
dropout_conv_layer = ConvFoldingPoolLayer(
rng,
input=next_layer_dropout_input,
filter_shape=filter_shape,
k=k,
norm_w=args.norm_w,
fold=fold_flag,
activation=args.conv_activation_unit)
# for prediction
# sharing weight with dropout layer
conv_layer = ConvFoldingPoolLayer(
rng,
input=next_layer_input,
filter_shape=filter_shape,
k=k,
activation=args.conv_activation_unit,
fold=fold_flag,
W=dropout_conv_layer.W *
(1 - args.dropout_rates[i]), # model averaging
b=dropout_conv_layer.b)
dropout_layers.append(dropout_conv_layer)
layers.append(conv_layer)
# last, the output layer
# both dropout and without dropout
if sum(args.fold_flags) > 0:
n_in = args.nkerns[-1] * args.ks[-1] * args.embed_dm / (2**sum(
args.fold_flags))
else:
n_in = args.nkerns[-1] * args.ks[-1] * args.embed_dm
print "For output layer, n_in = %d, dropout_rate = %f" % (
n_in, args.dropout_rates[-1])
dropout_output_layer = LogisticRegression(
rng,
input=dropout_layers[-1].output.flatten(2),
n_in=n_in, # divided by 2x(how many times are folded)
n_out=len(possible_labels) # five sentiment level
)
output_layer = LogisticRegression(
rng,
input=layers[-1].output.flatten(2),
n_in=n_in,
n_out=len(possible_labels),
W=dropout_output_layer.W *
(1 - args.dropout_rates[-1]), # sharing the parameters, don't forget
b=dropout_output_layer.b)
dropout_layers.append(dropout_output_layer)
layers.append(output_layer)
###############################
# Error and cost #
###############################
# cost and error come from different model!
dropout_cost = dropout_output_layer.nnl(y)
errors = output_layer.errors(y)
def prepare_L2_sqr(param_layers, L2_regs):
assert len(L2_regs) == len(param_layers)
return T.sum([
L2_reg / 2 *
((layer.W if hasattr(layer, "W") else layer.embeddings)**2).sum()
for L2_reg, layer in zip(L2_regs, param_layers)
])
L2_sqr = prepare_L2_sqr(dropout_layers, args.L2_regs)
L2_sqr_no_ebd = prepare_L2_sqr(dropout_layers[1:], args.L2_regs[1:])
if args.use_L2_reg:
cost = dropout_cost + L2_sqr
cost_no_ebd = dropout_cost + L2_sqr_no_ebd
else:
cost = dropout_cost
cost_no_ebd = dropout_cost
###############################
# Parameters to be used #
###############################
print "Delay embedding learning by %d epochs" % (
args.embedding_learning_delay_epochs)
print "param_layers: %r" % dropout_layers
param_layers = dropout_layers
##############################
# Parameter Update #
##############################
print "Using AdaDelta with rho = %f and epsilon = %f" % (args.rho,
args.epsilon)
params = [param for layer in param_layers for param in layer.params]
param_shapes = [
param for layer in param_layers for param in layer.param_shapes
]
param_grads = [T.grad(cost, param) for param in params]
# AdaDelta parameter update
# E[g^2]
# initialized to zero
egs = [
theano.shared(value=np.zeros(param_shape, dtype=theano.config.floatX),
borrow=True,
name="Eg:" + param.name)
for param_shape, param in zip(param_shapes, params)
]
# E[\delta x^2], initialized to zero
exs = [
theano.shared(value=np.zeros(param_shape, dtype=theano.config.floatX),
borrow=True,
name="Ex:" + param.name)
for param_shape, param in zip(param_shapes, params)
]
new_egs = [
args.rho * eg + (1 - args.rho) * g**2
for eg, g in zip(egs, param_grads)
]
delta_x = [
-(T.sqrt(ex + args.epsilon) / T.sqrt(new_eg + args.epsilon)) * g
for new_eg, ex, g in zip(new_egs, exs, param_grads)
]
new_exs = [
args.rho * ex + (1 - args.rho) * (dx**2)
for ex, dx in zip(exs, delta_x)
]
egs_updates = zip(egs, new_egs)
exs_updates = zip(exs, new_exs)
param_updates = [(p, p + dx)
for dx, g, p in zip(delta_x, param_grads, params)]
updates = egs_updates + exs_updates + param_updates
# updates WITHOUT embedding
# exclude the embedding parameter
egs_updates_no_ebd = zip(egs[1:], new_egs[1:])
exs_updates_no_ebd = zip(exs[1:], new_exs[1:])
param_updates_no_ebd = [
(p, p + dx) for dx, g, p in zip(delta_x, param_grads, params)[1:]
]
updates_no_emb = egs_updates_no_ebd + exs_updates_no_ebd + param_updates_no_ebd
def make_train_func(cost, updates):
return theano.function(
inputs=[batch_index],
outputs=[cost],
updates=updates,
givens={
x:
train_set_x[batch_index * args.batch_size:(batch_index + 1) *
args.batch_size],
y:
train_set_y[batch_index * args.batch_size:(batch_index + 1) *
args.batch_size]
})
train_model_no_ebd = make_train_func(cost_no_ebd, updates_no_emb)
train_model = make_train_func(cost, updates)
def make_error_func(x_val, y_val):
return theano.function(
inputs=[],
outputs=errors,
givens={
x: x_val,
y: y_val
},
)
dev_error = make_error_func(dev_set_x, dev_set_y)
test_error = make_error_func(test_set_x, test_set_y)
#############################
# Debugging purpose code #
#############################
# : PARAMETER TUNING NOTE:
# some demonstration of the gradient vanishing probelm
train_data_at_index = {
x:
train_set_x[batch_index * args.batch_size:(batch_index + 1) *
args.batch_size],
}
train_data_at_index_with_y = {
x:
train_set_x[batch_index * args.batch_size:(batch_index + 1) *
args.batch_size],
y:
train_set_y[batch_index * args.batch_size:(batch_index + 1) *
args.batch_size]
}
if print_config["nnl"]:
get_nnl = theano.function(
inputs=[batch_index],
outputs=dropout_cost,
givens={
x:
train_set_x[batch_index * args.batch_size:(batch_index + 1) *
args.batch_size],
y:
train_set_y[batch_index * args.batch_size:(batch_index + 1) *
args.batch_size]
})
if print_config["L2_sqr"]:
get_L2_sqr = theano.function(inputs=[], outputs=L2_sqr)
get_L2_sqr_no_ebd = theano.function(inputs=[], outputs=L2_sqr_no_ebd)
if print_config["grad_abs_mean"]:
print_grads = theano.function(
inputs=[],
outputs=[
theano.printing.Print(param.name)(T.mean(T.abs_(param_grad)))
for param, param_grad in zip(params, param_grads)
],
givens={
x: train_set_x,
y: train_set_y
})
activations = [l.output for l in dropout_layers[1:-1]]
weight_grads = [T.grad(cost, l.W) for l in dropout_layers[1:-1]]
if print_config["activation_hist"]:
# turn into 1D array
get_activations = theano.function(
inputs=[batch_index],
outputs=[val.flatten(1) for val in activations],
givens=train_data_at_index)
if print_config["weight_grad_hist"]:
# turn into 1D array
get_weight_grads = theano.function(
inputs=[batch_index],
outputs=[val.flatten(1) for val in weight_grads],
givens=train_data_at_index_with_y)
if print_config["activation_tracking"]:
# get the mean and variance of activations for each conv layer
get_activation_mean = theano.function(
inputs=[batch_index],
outputs=[T.mean(val) for val in activations],
givens=train_data_at_index)
get_activation_std = theano.function(
inputs=[batch_index],
outputs=[T.std(val) for val in activations],
givens=train_data_at_index)
if print_config["weight_grad_tracking"]:
# get the mean and variance of activations for each conv layer
get_weight_grad_mean = theano.function(
inputs=[batch_index],
outputs=[T.mean(g) for g in weight_grads],
givens=train_data_at_index_with_y)
get_weight_grad_std = theano.function(
inputs=[batch_index],
outputs=[T.std(g) for g in weight_grads],
givens=train_data_at_index_with_y)
#the training loop
patience = args.patience # look as this many examples regardless
patience_increase = 2 # wait this much longer when a new best is
# found
improvement_threshold = 0.995 # a relative improvement of this much is
# considered significant
validation_frequency = min(n_train_batches, patience / 2)
best_validation_loss = np.inf
best_iter = 0
start_time = time.clock()
done_looping = False
epoch = 0
nnls = []
L2_sqrs = []
activation_means = [[] for i in range(args.conv_layer_n)]
activation_stds = [[] for i in range(args.conv_layer_n)]
weight_grad_means = [[] for i in range(args.conv_layer_n)]
weight_grad_stds = [[] for i in range(args.conv_layer_n)]
activation_hist_data = [[] for i in range(args.conv_layer_n)]
weight_grad_hist_data = [[] for i in range(args.conv_layer_n)]
train_errors = []
dev_errors = []
try:
print "validation_frequency = %d" % validation_frequency
while (epoch < args.n_epochs):
epoch += 1
print "At epoch {0}".format(epoch)
if epoch == (args.embedding_learning_delay_epochs + 1):
print "########################"
print "Start training embedding"
print "########################"
# shuffle the training data
train_set_x_data = train_set_x.get_value(borrow=True)
train_set_y_data = train_set_y.get_value(borrow=True)
permutation = np.random.permutation(
train_set_x.get_value(borrow=True).shape[0])
train_set_x.set_value(train_set_x_data[permutation])
train_set_y.set_value(train_set_y_data[permutation])
for minibatch_index in range(n_train_batches):
if epoch >= (args.embedding_learning_delay_epochs + 1):
train_cost = train_model(minibatch_index)
else:
train_cost = train_model_no_ebd(minibatch_index)
iter = (epoch - 1) * n_train_batches + minibatch_index
if (iter + 1) % validation_frequency == 0:
# train_error_val = np.mean([train_error(i)
# for i in range(n_train_batches)])
dev_error_val = dev_error()
# print "At epoch %d and minibatch %d. \nTrain error %.2f%%\nDev error %.2f%%\n" %(
# epoch,
# minibatch_index,
# train_error_val * 100,
# dev_error_val * 100
# )
print "At epoch %d and minibatch %d. \nDev error %.2f%%\n" % (
epoch, minibatch_index, dev_error_val * 100)
# train_errors.append(train_error_val)
dev_errors.append(dev_error_val)
if dev_error_val < best_validation_loss:
best_iter = iter
#improve patience if loss improvement is good enough
if dev_error_val < best_validation_loss * \
improvement_threshold:
patience = max(patience, iter * patience_increase)
best_validation_loss = dev_error_val
test_error_val = test_error()
print((' epoch %i, minibatch %i/%i, test error of'
' best dev error %f %%') %
(epoch, minibatch_index + 1, n_train_batches,
test_error_val * 100.))
print "Dumping model to %s" % (args.model_path)
dump_params(params, args.model_path)
if (minibatch_index +
1) % 50 == 0 or minibatch_index == n_train_batches - 1:
print "%d / %d minibatches completed" % (
minibatch_index + 1, n_train_batches)
if print_config["nnl"]:
print "`nnl` for the past 50 minibatches is %f" % (
np.mean(np.array(nnls)))
nnls = []
if print_config["L2_sqr"]:
print "`L2_sqr`` for the past 50 minibatches is %f" % (
np.mean(np.array(L2_sqrs)))
L2_sqrs = []
##################
# Plotting stuff #
##################
if print_config["nnl"]:
nnl = get_nnl(minibatch_index)
# print "nll for batch %d: %f" %(minibatch_index, nnl)
nnls.append(nnl)
if print_config["L2_sqr"]:
if epoch >= (args.embedding_learning_delay_epochs + 1):
L2_sqrs.append(get_L2_sqr())
else:
L2_sqrs.append(get_L2_sqr_no_ebd())
if print_config["activation_tracking"]:
layer_means = get_activation_mean(minibatch_index)
layer_stds = get_activation_std(minibatch_index)
for layer_ms, layer_ss, layer_m, layer_s in zip(
activation_means, activation_stds, layer_means,
layer_stds):
layer_ms.append(layer_m)
layer_ss.append(layer_s)
if print_config["weight_grad_tracking"]:
layer_means = get_weight_grad_mean(minibatch_index)
layer_stds = get_weight_grad_std(minibatch_index)
for layer_ms, layer_ss, layer_m, layer_s in zip(
weight_grad_means, weight_grad_stds, layer_means,
layer_stds):
layer_ms.append(layer_m)
layer_ss.append(layer_s)
if print_config["activation_hist"]:
for layer_hist, layer_data in zip(
activation_hist_data,
get_activations(minibatch_index)):
layer_hist += layer_data.tolist()
if print_config["weight_grad_hist"]:
for layer_hist, layer_data in zip(
weight_grad_hist_data,
get_weight_grads(minibatch_index)):
layer_hist += layer_data.tolist()
except:
import traceback
traceback.print_exc(file=sys.stdout)
finally:
from plot_util import (plot_hist, plot_track, plot_error_vs_epoch, plt)
if print_config["activation_tracking"]:
plot_track(activation_means, activation_stds,
"activation_tracking")
if print_config["weight_grad_tracking"]:
plot_track(weight_grad_means, weight_grad_stds,
"weight_grad_tracking")
if print_config["activation_hist"]:
plot_hist(activation_hist_data, "activation_hist")
if print_config["weight_grad_hist"]:
plot_hist(weight_grad_hist_data, "weight_grad_hist")
if print_config["error_vs_epoch"]:
train_errors = [0] * len(dev_errors)
ax = plot_error_vs_epoch(
train_errors,
dev_errors,
title=('Best dev score: %f %% '
' at iter %i with test error %f %%') %
(best_validation_loss * 100., best_iter + 1,
test_error_val * 100.))
if not args.task_signature:
plt.show()
else:
plt.savefig("plots/" + args.task_signature + ".png")
end_time = time.clock()
print(('Optimization complete. Best validation score of %f %% '
'obtained at iteration %i, with test performance %f %%') %
(best_validation_loss * 100., best_iter + 1, test_error_val * 100.))
# save the result
with open(args.output, "a") as f:
f.write("%s\t%f\t%f\n" %
(args.task_signature, best_validation_loss, test_error_val))
print >> sys.stderr, ('The code for file ' + os.path.split(__file__)[1] +
' ran for %.2fm' % ((end_time - start_time) / 60.))
dtype = theano.config.floatX)
layer3 = LogisticRegression(rng = rng,
input = layer2.output.flatten(2),
n_in = n_in,
n_out = n_out,
W = theano.shared(value = W_logreg, name = "W_logreg"),
b = theano.shared(value = b_logreg, name = "b_logreg")
)
f1 = theano.function(inputs = [x_symbol, y_symbol],
outputs = layer3.nnl(y_symbol)
)
f2 = theano.function(inputs = [x_symbol, y_symbol],
outputs = layer3.errors(y_symbol)
)
f3 = theano.function(inputs = [x_symbol],
outputs = layer3.p_y_given_x
)
f_el = theano.function(inputs = [x_symbol],
outputs = layer1.output
)
f_cl = theano.function(inputs = [x_symbol],
outputs = layer2.output
)
#########################
def evaluate_lenet5(learning_rate=0.1, n_epochs=200,
dataset='mnist.pkl.gz',
nkerns=[20, 50], batch_size=500):
""" Demonstrates lenet on MNIST dataset
:type learning_rate: float
:param learning_rate: learning rate used (factor for the stochastic
gradient)
:type n_epochs: int
:param n_epochs: maximal number of epochs to run the optimizer
:type dataset: string
:param dataset: path to the dataset used for training /testing (MNIST here)
:type nkerns: list of ints
:param nkerns: number of kernels on each layer
"""
rng = numpy.random.RandomState(23455)
datasets = load_data(dataset)
train_set_x, train_set_y = datasets[0]
valid_set_x, valid_set_y = datasets[1]
test_set_x, test_set_y = datasets[2]
# compute number of minibatches for training, validation and testing
n_train_batches = train_set_x.get_value(borrow=True).shape[0]
n_valid_batches = valid_set_x.get_value(borrow=True).shape[0]
n_test_batches = test_set_x.get_value(borrow=True).shape[0]
n_train_batches /= batch_size
n_valid_batches /= batch_size
n_test_batches /= batch_size
# allocate symbolic variables for the data
index = T.lscalar() # index to a [mini]batch
# start-snippet-1
x = T.matrix('x') # the data is presented as rasterized images
y = T.ivector('y') # the labels are presented as 1D vector of
# [int] labels
######################
# BUILD ACTUAL MODEL #
######################
print '... building the model'
# Reshape matrix of rasterized images of shape (batch_size, 28 * 28)
# to a 4D tensor, compatible with our LeNetConvPoolLayer
# (28, 28) is the size of MNIST images.
layer0_input = x.reshape((batch_size, 1, 28, 28))
# Construct the first convolutional pooling layer:
# filtering reduces the image size to (28-5+1 , 28-5+1) = (24, 24)
# maxpooling reduces this further to (24/2, 24/2) = (12, 12)
# 4D output tensor is thus of shape (batch_size, nkerns[0], 12, 12)
layer0 = LeNetConvPoolLayer(
rng,
input=layer0_input,
image_shape=(batch_size, 1, 28, 28),
filter_shape=(nkerns[0], 1, 5, 5),
poolsize=(2, 2)
)
# Construct the second convolutional pooling layer
# filtering reduces the image size to (12-5+1, 12-5+1) = (8, 8)
# maxpooling reduces this further to (8/2, 8/2) = (4, 4)
# 4D output tensor is thus of shape (batch_size, nkerns[1], 4, 4)
layer1 = LeNetConvPoolLayer(
rng,
input=layer0.output,
image_shape=(batch_size, nkerns[0], 12, 12),
filter_shape=(nkerns[1], nkerns[0], 5, 5),
poolsize=(2, 2)
)
# the HiddenLayer being fully-connected, it operates on 2D matrices of
# shape (batch_size, num_pixels) (i.e matrix of rasterized images).
# This will generate a matrix of shape (batch_size, nkerns[1] * 4 * 4),
# or (500, 50 * 4 * 4) = (500, 800) with the default values.
layer2_input = layer1.output.flatten(2)
# construct a fully-connected sigmoidal layer
layer2 = HiddenLayer(
rng,
input=layer2_input,
n_in=nkerns[1] * 4 * 4,
n_out=500,
activation=T.tanh
)
# classify the values of the fully-connected sigmoidal layer
layer3 = LogisticRegression(input=layer2.output, n_in=500, n_out=10)
# the cost we minimize during training is the NLL of the model
cost = layer3.negative_log_likelihood(y)
# create a function to compute the mistakes that are made by the model
test_model = theano.function(
[index],
layer3.errors(y),
givens={
x: test_set_x[index * batch_size: (index + 1) * batch_size],
y: test_set_y[index * batch_size: (index + 1) * batch_size]
}
)
validate_model = theano.function(
[index],
layer3.errors(y),
givens={
x: valid_set_x[index * batch_size: (index + 1) * batch_size],
y: valid_set_y[index * batch_size: (index + 1) * batch_size]
}
)
# create a list of all model parameters to be fit by gradient descent
params = layer3.params + layer2.params + layer1.params + layer0.params
# create a list of gradients for all model parameters
grads = T.grad(cost, params)
# train_model is a function that updates the model parameters by
# SGD Since this model has many parameters, it would be tedious to
# manually create an update rule for each model parameter. We thus
# create the updates list by automatically looping over all
# (params[i], grads[i]) pairs.
updates = [
(param_i, param_i - learning_rate * grad_i)
for param_i, grad_i in zip(params, grads)
]
train_model = theano.function(
[index],
cost,
updates=updates,
givens={
x: train_set_x[index * batch_size: (index + 1) * batch_size],
y: train_set_y[index * batch_size: (index + 1) * batch_size]
}
)
# end-snippet-1
###############
# TRAIN MODEL #
###############
print '... training'
# early-stopping parameters
patience = 10000 # look as this many examples regardless
patience_increase = 2 # wait this much longer when a new best is
# found
improvement_threshold = 0.995 # a relative improvement of this much is
# considered significant
validation_frequency = min(n_train_batches, patience / 2)
# go through this many
# minibatche before checking the network
# on the validation set; in this case we
# check every epoch
best_validation_loss = numpy.inf
best_iter = 0
test_score = 0.
start_time = timeit.default_timer()
epoch = 0
done_looping = False
while (epoch < n_epochs) and (not done_looping):
epoch = epoch + 1
for minibatch_index in xrange(n_train_batches):
iter = (epoch - 1) * n_train_batches + minibatch_index
if iter % 100 == 0:
print 'training @ iter = ', iter
cost_ij = train_model(minibatch_index)
if (iter + 1) % validation_frequency == 0:
# compute zero-one loss on validation set
validation_losses = [validate_model(i) for i
in xrange(n_valid_batches)]
this_validation_loss = numpy.mean(validation_losses)
print('epoch %i, minibatch %i/%i, validation error %f %%' %
(epoch, minibatch_index + 1, n_train_batches,
this_validation_loss * 100.))
# if we got the best validation score until now
if this_validation_loss < best_validation_loss:
#improve patience if loss improvement is good enough
if this_validation_loss < best_validation_loss * \
improvement_threshold:
patience = max(patience, iter * patience_increase)
# save best validation score and iteration number
best_validation_loss = this_validation_loss
best_iter = iter
# test it on the test set
test_losses = [
test_model(i)
for i in xrange(n_test_batches)
]
test_score = numpy.mean(test_losses)
print((' epoch %i, minibatch %i/%i, test error of '
'best model %f %%') %
(epoch, minibatch_index + 1, n_train_batches,
test_score * 100.))
if patience <= iter:
done_looping = True
break
end_time = timeit.default_timer()
print('Optimization complete.')
print('Best validation score of %f %% obtained at iteration %i, '
'with test performance %f %%' %
(best_validation_loss * 100., best_iter + 1, test_score * 100.))
print >> sys.stderr, ('The code for file ' +
os.path.split(__file__)[1] +
' ran for %.2fm' % ((end_time - start_time) / 60.))
def train_and_test(args, print_config):
assert args.conv_layer_n == len(args.filter_widths) == len(args.nkerns) == (len(args.L2_regs) - 2) == len(args.fold_flags) == len(args.ks)
# \mod{dim, 2^{\sum fold_flags}} == 0
assert args.embed_dm % (2 ** sum(args.fold_flags)) == 0
###################
# get the data #
###################
datasets = load_data(args.corpus_path)
train_set_x, train_set_y = datasets[0]
dev_set_x, dev_set_y = datasets[1]
test_set_x, test_set_y = datasets[2]
word2index = datasets[3]
index2word = datasets[4]
pretrained_embeddings = datasets[5]
n_train_batches = train_set_x.get_value(borrow=True).shape[0] / args.batch_size
n_dev_batches = dev_set_x.get_value(borrow=True).shape[0] / args.dev_test_batch_size
n_test_batches = test_set_x.get_value(borrow=True).shape[0] / args.dev_test_batch_size
train_sent_len = train_set_x.get_value(borrow=True).shape[1]
possible_labels = set(train_set_y.get_value().tolist())
if args.use_pretrained_embedding:
args.embed_dm = pretrained_embeddings.get_value().shape[1]
###################################
# Symbolic variable definition #
###################################
x = T.imatrix('x') # the word indices matrix
y = T.ivector('y') # the sentiment labels
batch_index = T.iscalar('batch_index')
rng = np.random.RandomState(1234)
###############################
# Construction of the network #
###############################
# Layer 1, the embedding layer
layer1 = WordEmbeddingLayer(rng,
input = x,
vocab_size = len(word2index),
embed_dm = args.embed_dm,
embeddings = (
pretrained_embeddings
if args.use_pretrained_embedding else None
)
)
dropout_layers = [layer1]
layers = [layer1]
for i in xrange(args.conv_layer_n):
fold_flag = args.fold_flags[i]
# for the dropout layer
dpl = DropoutLayer(
input = dropout_layers[-1].output,
rng = rng,
dropout_rate = args.dropout_rates[0]
)
next_layer_dropout_input = dpl.output
next_layer_input = layers[-1].output
# for the conv layer
filter_shape = (
args.nkerns[i],
(1 if i == 0 else args.nkerns[i-1]),
1,
args.filter_widths[i]
)
k = args.ks[i]
print "For conv layer(%s) %d, filter shape = %r, k = %d, dropout_rate = %f and normalized weight init: %r and fold: %d" %(
args.conv_activation_unit,
i+2,
filter_shape,
k,
args.dropout_rates[i],
args.norm_w,
fold_flag
)
# we have two layers adding to two paths repsectively,
# one for training
# the other for prediction(averaged model)
dropout_conv_layer = ConvFoldingPoolLayer(rng,
input = next_layer_dropout_input,
filter_shape = filter_shape,
k = k,
norm_w = args.norm_w,
fold = fold_flag,
activation = args.conv_activation_unit)
# for prediction
# sharing weight with dropout layer
conv_layer = ConvFoldingPoolLayer(rng,
input = next_layer_input,
filter_shape = filter_shape,
k = k,
activation = args.conv_activation_unit,
fold = fold_flag,
W = dropout_conv_layer.W * (1 - args.dropout_rates[i]), # model averaging
b = dropout_conv_layer.b
)
dropout_layers.append(dropout_conv_layer)
layers.append(conv_layer)
# last, the output layer
# both dropout and without dropout
if sum(args.fold_flags) > 0:
n_in = args.nkerns[-1] * args.ks[-1] * args.embed_dm / (2**sum(args.fold_flags))
else:
n_in = args.nkerns[-1] * args.ks[-1] * args.embed_dm
print "For output layer, n_in = %d, dropout_rate = %f" %(n_in, args.dropout_rates[-1])
dropout_output_layer = LogisticRegression(
rng,
input = dropout_layers[-1].output.flatten(2),
n_in = n_in, # divided by 2x(how many times are folded)
n_out = len(possible_labels) # five sentiment level
)
output_layer = LogisticRegression(
rng,
input = layers[-1].output.flatten(2),
n_in = n_in,
n_out = len(possible_labels),
W = dropout_output_layer.W * (1 - args.dropout_rates[-1]), # sharing the parameters, don't forget
b = dropout_output_layer.b
)
dropout_layers.append(dropout_output_layer)
layers.append(output_layer)
###############################
# Error and cost #
###############################
# cost and error come from different model!
dropout_cost = dropout_output_layer.nnl(y)
errors = output_layer.errors(y)
def prepare_L2_sqr(param_layers, L2_regs):
assert len(L2_regs) == len(param_layers)
return T.sum([
L2_reg / 2 * ((layer.W if hasattr(layer, "W") else layer.embeddings) ** 2).sum()
for L2_reg, layer in zip(L2_regs, param_layers)
])
L2_sqr = prepare_L2_sqr(dropout_layers, args.L2_regs)
L2_sqr_no_ebd = prepare_L2_sqr(dropout_layers[1:], args.L2_regs[1:])
if args.use_L2_reg:
cost = dropout_cost + L2_sqr
cost_no_ebd = dropout_cost + L2_sqr_no_ebd
else:
cost = dropout_cost
cost_no_ebd = dropout_cost
###############################
# Parameters to be used #
###############################
print "Delay embedding learning by %d epochs" %(args.embedding_learning_delay_epochs)
print "param_layers: %r" %dropout_layers
param_layers = dropout_layers
##############################
# Parameter Update #
##############################
print "Using AdaDelta with rho = %f and epsilon = %f" %(args.rho, args.epsilon)
params = [param for layer in param_layers for param in layer.params]
param_shapes= [param for layer in param_layers for param in layer.param_shapes]
param_grads = [T.grad(cost, param) for param in params]
# AdaDelta parameter update
# E[g^2]
# initialized to zero
egs = [
theano.shared(
value = np.zeros(param_shape,
dtype = theano.config.floatX
),
borrow = True,
name = "Eg:" + param.name
)
for param_shape, param in zip(param_shapes, params)
]
# E[\delta x^2], initialized to zero
exs = [
theano.shared(
value = np.zeros(param_shape,
dtype = theano.config.floatX
),
borrow = True,
name = "Ex:" + param.name
)
for param_shape, param in zip(param_shapes, params)
]
new_egs = [
args.rho * eg + (1 - args.rho) * g ** 2
for eg, g in zip(egs, param_grads)
]
delta_x = [
-(T.sqrt(ex + args.epsilon) / T.sqrt(new_eg + args.epsilon)) * g
for new_eg, ex, g in zip(new_egs, exs, param_grads)
]
new_exs = [
args.rho * ex + (1 - args.rho) * (dx ** 2)
for ex, dx in zip(exs, delta_x)
]
egs_updates = zip(egs, new_egs)
exs_updates = zip(exs, new_exs)
param_updates = [
(p, p + dx)
for dx, g, p in zip(delta_x, param_grads, params)
]
updates = egs_updates + exs_updates + param_updates
# updates WITHOUT embedding
# exclude the embedding parameter
egs_updates_no_ebd = zip(egs[1:], new_egs[1:])
exs_updates_no_ebd = zip(exs[1:], new_exs[1:])
param_updates_no_ebd = [
(p, p + dx)
for dx, g, p in zip(delta_x, param_grads, params)[1:]
]
updates_no_emb = egs_updates_no_ebd + exs_updates_no_ebd + param_updates_no_ebd
def make_train_func(cost, updates):
return theano.function(inputs = [batch_index],
outputs = [cost],
updates = updates,
givens = {
x: train_set_x[batch_index * args.batch_size: (batch_index + 1) * args.batch_size],
y: train_set_y[batch_index * args.batch_size: (batch_index + 1) * args.batch_size]
}
)
train_model_no_ebd = make_train_func(cost_no_ebd, updates_no_emb)
train_model = make_train_func(cost, updates)
def make_error_func(x_val, y_val):
return theano.function(inputs = [],
outputs = errors,
givens = {
x: x_val,
y: y_val
},
)
dev_error = make_error_func(dev_set_x, dev_set_y)
test_error = make_error_func(test_set_x, test_set_y)
#############################
# Debugging purpose code #
#############################
# : PARAMETER TUNING NOTE:
# some demonstration of the gradient vanishing probelm
train_data_at_index = {
x: train_set_x[batch_index * args.batch_size: (batch_index + 1) * args.batch_size],
}
train_data_at_index_with_y = {
x: train_set_x[batch_index * args.batch_size: (batch_index + 1) * args.batch_size],
y: train_set_y[batch_index * args.batch_size: (batch_index + 1) * args.batch_size]
}
if print_config["nnl"]:
get_nnl = theano.function(
inputs = [batch_index],
outputs = dropout_cost,
givens = {
x: train_set_x[batch_index * args.batch_size: (batch_index + 1) * args.batch_size],
y: train_set_y[batch_index * args.batch_size: (batch_index + 1) * args.batch_size]
}
)
if print_config["L2_sqr"]:
get_L2_sqr = theano.function(
inputs = [],
outputs = L2_sqr
)
get_L2_sqr_no_ebd = theano.function(
inputs = [],
outputs = L2_sqr_no_ebd
)
if print_config["grad_abs_mean"]:
print_grads = theano.function(
inputs = [],
outputs = [theano.printing.Print(param.name)(
T.mean(T.abs_(param_grad))
)
for param, param_grad in zip(params, param_grads)
],
givens = {
x: train_set_x,
y: train_set_y
}
)
activations = [
l.output
for l in dropout_layers[1:-1]
]
weight_grads = [
T.grad(cost, l.W)
for l in dropout_layers[1:-1]
]
if print_config["activation_hist"]:
# turn into 1D array
get_activations = theano.function(
inputs = [batch_index],
outputs = [
val.flatten(1)
for val in activations
],
givens = train_data_at_index
)
if print_config["weight_grad_hist"]:
# turn into 1D array
get_weight_grads = theano.function(
inputs = [batch_index],
outputs = [
val.flatten(1)
for val in weight_grads
],
givens = train_data_at_index_with_y
)
if print_config["activation_tracking"]:
# get the mean and variance of activations for each conv layer
get_activation_mean = theano.function(
inputs = [batch_index],
outputs = [
T.mean(val)
for val in activations
],
givens = train_data_at_index
)
get_activation_std = theano.function(
inputs = [batch_index],
outputs = [
T.std(val)
for val in activations
],
givens = train_data_at_index
)
if print_config["weight_grad_tracking"]:
# get the mean and variance of activations for each conv layer
get_weight_grad_mean = theano.function(
inputs = [batch_index],
outputs = [
T.mean(g)
for g in weight_grads
],
givens = train_data_at_index_with_y
)
get_weight_grad_std = theano.function(
inputs = [batch_index],
outputs = [
T.std(g)
for g in weight_grads
],
givens = train_data_at_index_with_y
)
#the training loop
patience = args.patience # look as this many examples regardless
patience_increase = 2 # wait this much longer when a new best is
# found
improvement_threshold = 0.995 # a relative improvement of this much is
# considered significant
validation_frequency = min(n_train_batches, patience / 2)
best_validation_loss = np.inf
best_iter = 0
start_time = time.clock()
done_looping = False
epoch = 0
nnls = []
L2_sqrs = []
activation_means = [[] for i in xrange(args.conv_layer_n)]
activation_stds = [[] for i in xrange(args.conv_layer_n)]
weight_grad_means = [[] for i in xrange(args.conv_layer_n)]
weight_grad_stds = [[] for i in xrange(args.conv_layer_n)]
activation_hist_data = [[] for i in xrange(args.conv_layer_n)]
weight_grad_hist_data = [[] for i in xrange(args.conv_layer_n)]
train_errors = []
dev_errors = []
try:
print "validation_frequency = %d" %validation_frequency
while (epoch < args.n_epochs):
epoch += 1
print "At epoch {0}".format(epoch)
if epoch == (args.embedding_learning_delay_epochs + 1):
print "########################"
print "Start training embedding"
print "########################"
# shuffle the training data
train_set_x_data = train_set_x.get_value(borrow = True)
train_set_y_data = train_set_y.get_value(borrow = True)
permutation = np.random.permutation(train_set_x.get_value(borrow=True).shape[0])
train_set_x.set_value(train_set_x_data[permutation])
train_set_y.set_value(train_set_y_data[permutation])
for minibatch_index in xrange(n_train_batches):
if epoch >= (args.embedding_learning_delay_epochs + 1):
train_cost = train_model(minibatch_index)
else:
train_cost = train_model_no_ebd(minibatch_index)
iter = (epoch - 1) * n_train_batches + minibatch_index
if (iter + 1) % validation_frequency == 0:
# train_error_val = np.mean([train_error(i)
# for i in xrange(n_train_batches)])
dev_error_val = dev_error()
# print "At epoch %d and minibatch %d. \nTrain error %.2f%%\nDev error %.2f%%\n" %(
# epoch,
# minibatch_index,
# train_error_val * 100,
# dev_error_val * 100
# )
print "At epoch %d and minibatch %d. \nDev error %.2f%%\n" %(
epoch,
minibatch_index,
dev_error_val * 100
)
# train_errors.append(train_error_val)
dev_errors.append(dev_error_val)
if dev_error_val < best_validation_loss:
best_iter = iter
#improve patience if loss improvement is good enough
if dev_error_val < best_validation_loss * \
improvement_threshold:
patience = max(patience, iter * patience_increase)
best_validation_loss = dev_error_val
test_error_val = test_error()
print(
(
' epoch %i, minibatch %i/%i, test error of'
' best dev error %f %%'
) %
(
epoch,
minibatch_index + 1,
n_train_batches,
test_error_val * 100.
)
)
print "Dumping model to %s" %(args.model_path)
dump_params(params, args.model_path)
if (minibatch_index+1) % 50 == 0 or minibatch_index == n_train_batches - 1:
print "%d / %d minibatches completed" %(minibatch_index + 1, n_train_batches)
if print_config["nnl"]:
print "`nnl` for the past 50 minibatches is %f" %(np.mean(np.array(nnls)))
nnls = []
if print_config["L2_sqr"]:
print "`L2_sqr`` for the past 50 minibatches is %f" %(np.mean(np.array(L2_sqrs)))
L2_sqrs = []
##################
# Plotting stuff #
##################
if print_config["nnl"]:
nnl = get_nnl(minibatch_index)
# print "nll for batch %d: %f" %(minibatch_index, nnl)
nnls.append(nnl)
if print_config["L2_sqr"]:
if epoch >= (args.embedding_learning_delay_epochs + 1):
L2_sqrs.append(get_L2_sqr())
else:
L2_sqrs.append(get_L2_sqr_no_ebd())
if print_config["activation_tracking"]:
layer_means = get_activation_mean(minibatch_index)
layer_stds = get_activation_std(minibatch_index)
for layer_ms, layer_ss, layer_m, layer_s in zip(activation_means, activation_stds, layer_means, layer_stds):
layer_ms.append(layer_m)
layer_ss.append(layer_s)
if print_config["weight_grad_tracking"]:
layer_means = get_weight_grad_mean(minibatch_index)
layer_stds = get_weight_grad_std(minibatch_index)
for layer_ms, layer_ss, layer_m, layer_s in zip(weight_grad_means, weight_grad_stds, layer_means, layer_stds):
layer_ms.append(layer_m)
layer_ss.append(layer_s)
if print_config["activation_hist"]:
for layer_hist, layer_data in zip(activation_hist_data , get_activations(minibatch_index)):
layer_hist += layer_data.tolist()
if print_config["weight_grad_hist"]:
for layer_hist, layer_data in zip(weight_grad_hist_data , get_weight_grads(minibatch_index)):
layer_hist += layer_data.tolist()
except:
import traceback
traceback.print_exc(file = sys.stdout)
finally:
from plot_util import (plot_hist,
plot_track,
plot_error_vs_epoch,
plt)
if print_config["activation_tracking"]:
plot_track(activation_means,
activation_stds,
"activation_tracking")
if print_config["weight_grad_tracking"]:
plot_track(weight_grad_means,
weight_grad_stds,
"weight_grad_tracking")
if print_config["activation_hist"]:
plot_hist(activation_hist_data, "activation_hist")
if print_config["weight_grad_hist"]:
plot_hist(weight_grad_hist_data, "weight_grad_hist")
if print_config["error_vs_epoch"]:
train_errors = [0] * len(dev_errors)
ax = plot_error_vs_epoch(train_errors, dev_errors,
title = ('Best dev score: %f %% '
' at iter %i with test error %f %%') %(
best_validation_loss * 100., best_iter + 1, test_error_val * 100.
)
)
if not args.task_signature:
plt.show()
else:
plt.savefig("plots/" + args.task_signature + ".png")
end_time = time.clock()
print(('Optimization complete. Best validation score of %f %% '
'obtained at iteration %i, with test performance %f %%') %
(best_validation_loss * 100., best_iter + 1, test_error_val * 100.))
# save the result
with open(args.output, "a") as f:
f.write("%s\t%f\t%f\n" %(args.task_signature, best_validation_loss, test_error_val))
print >> sys.stderr, ('The code for file ' +
os.path.split(__file__)[1] +
' ran for %.2fm' % ((end_time - start_time) / 60.))
def __init__(self, x, y, batch_size, videos, kernels, pools, n_input, n_output, hidden_input, params=None):
learning_rate = 0.1
rng = numpy.random.RandomState(1234)
print '... building the model'
sys.stdout.flush()
if not params:
# Construct the first convolutional pooling layer:
# filtering reduces the image size to (28-5+1,28-5+1)=(24,24)
# maxpooling reduces this further to (24/2,24/2) = (12,12)
# 4D output tensor is thus of shape (batch_size,nkerns[0],12,12)
layer0 = ConvLayer(x, n_input[0], n_output[0], kernels[0], videos[0], pools[0],
batch_size, 'L0', rng)
layer1 = ConvLayer(layer0.output, n_input[1], n_output[1], kernels[1], videos[1], pools[1],
batch_size, 'L1', rng)
layer2_input = layer1.output.flatten(2)
# construct a fully-connected sigmoidal layer
layer2 = HiddenLayer(rng, input=layer2_input, n_in=hidden_input,
n_out=batch_size, activation=T.tanh)
# classify the values of the fully-connected sigmoidal layer
layer3 = LogisticRegression(input=layer2.output, n_in=batch_size, n_out=2)
else:
layer0 = ConvLayer(x, n_input[0], n_output[0], kernels[0], videos[0], pools[0],
batch_size, 'L0', rng, True, params[6], params[7])
layer1 = ConvLayer(layer0.output, n_input[1], n_output[1], kernels[1], videos[1], pools[1],
batch_size, 'L1', rng, True, params[4], params[5])
layer2_input = layer1.output.flatten(2)
# construct a fully-connected sigmoidal layer
layer2 = HiddenLayer(rng, input=layer2_input, n_in=hidden_input,
n_out=batch_size, activation=T.tanh, W=params[2], b=params[3])
# classify the values of the fully-connected sigmoidal layer
layer3 = LogisticRegression(input=layer2.output, n_in=batch_size, n_out=2, W=params[0], b=params[1])
# the cost we minimize during training is the NLL of the model
cost = layer3.negative_log_likelihood(y)
# create a list of all model parameters to be fit by gradient descent
self.params = layer3.params + layer2.params + layer1.params + layer0.params
# create a list of gradients for all model parameters
grads = T.grad(cost, self.params)
# train_model is a function that updates the model parameters by
# SGD Since this model has many parameters, it would be tedious to
# manually create an update rule for each model parameter. We thus
# create the updates list by automatically looping over all
# (params[i],grads[i]) pairs.
updates = []
for param_i, grad_i in zip(self.params, grads):
updates.append((param_i, param_i - learning_rate * grad_i))
self.train_model = theano.function([x, y], cost, updates=updates)
self.validate_model = theano.function(inputs=[x, y], outputs=layer3.errors(y))
self.predict = theano.function(inputs=[x], outputs=layer3.y_pred)
print '... building done'
sys.stdout.flush()
np_l = LogisticRegression(W, b)
#########################
# THEANO PART
#########################
x_symbol = theano.tensor.dmatrix('x')
y_symbol = theano.tensor.ivector('y')
th_l = TheanoLogisticRegression(rng=np.random.RandomState(1234),
input=x_symbol,
n_in=10,
n_out=5,
W=theano.shared(value=W, name="W"),
b=theano.shared(value=b, name="b"))
f1 = theano.function(inputs=[x_symbol, y_symbol], outputs=th_l.nnl(y_symbol))
actual = np_l.nnl(x, y)
expected = f1(x, y)
assert_matrix_eq(actual, expected, "nnl")
f2 = theano.function(inputs=[x_symbol, y_symbol],
outputs=th_l.errors(y_symbol))
actual = np_l.errors(x, y)
expected = f2(x, y)
assert_matrix_eq(actual, expected, "errors")
n_in = filter_shape[0] * k * embed_dm / 2
n_out = 5
W_logreg = np.asarray(np.random.rand(n_in, n_out), dtype=theano.config.floatX)
b_logreg = np.asarray(np.random.rand(n_out), dtype=theano.config.floatX)
layer3 = LogisticRegression(rng=rng,
input=layer2.output.flatten(2),
n_in=n_in,
n_out=n_out,
W=theano.shared(value=W_logreg, name="W_logreg"),
b=theano.shared(value=b_logreg, name="b_logreg"))
f1 = theano.function(inputs=[x_symbol, y_symbol], outputs=layer3.nnl(y_symbol))
f2 = theano.function(inputs=[x_symbol, y_symbol],
outputs=layer3.errors(y_symbol))
f3 = theano.function(inputs=[x_symbol], outputs=layer3.p_y_given_x)
f_el = theano.function(inputs=[x_symbol], outputs=layer1.output)
f_cl = theano.function(inputs=[x_symbol], outputs=layer2.output)
#########################
# NUMPY PART #
#########################
class Params(object):
pass
th_l = TheanoLogisticRegression(rng = np.random.RandomState(1234),
input = x_symbol,
n_in = 10,
n_out = 5,
W = theano.shared(value = W,
name = "W"),
b = theano.shared(value = b,
name = "b")
)
f1 = theano.function(inputs = [x_symbol, y_symbol],
outputs = th_l.nnl(y_symbol)
)
actual = np_l.nnl(x, y)
expected = f1(x, y)
assert_matrix_eq(actual, expected, "nnl")
f2 = theano.function(inputs = [x_symbol, y_symbol],
outputs = th_l.errors(y_symbol)
)
actual = np_l.errors(x, y)
expected = f2(x, y)
assert_matrix_eq(actual, expected, "errors")
