def test_vae():
ds = odin.dataset.load_mnist()
W = T.variable(T.np_glorot_uniform(shape=(784, 512)), name='W')
WT = T.transpose(W)
encoder = odin.nnet.Dense((None, 28, 28), num_units=512, W=W, name='encoder')
# decoder = odin.nnet.Dense((None, 256), num_units=512, name='decoder1')
decoder = odin.nnet.Dense((None, 512), num_units=784, W=WT, name='decoder2')
vae = odin.nnet.VariationalEncoderDecoder(encoder=encoder, decoder=decoder,
prior_logsigma=1.7, batch_size=64)
# ====== prediction ====== #
x = ds['X_train'][:16]
f = T.function(inputs=vae.input_var, outputs=vae(training=False))
print("Predictions:", f(x)[0].shape)
f = T.function(
inputs=vae.input_var,
outputs=vae.set_reconstruction_mode(True)(training=False))
y = f(x)[0].reshape(-1, 28, 28)
print("Predictions:", y.shape)
odin.visual.plot_images(x)
odin.visual.plot_images(y)
odin.visual.plot_show()
print('Params:', [p.name for p in vae.get_params(False)])
print('Params(globals):', [p.name for p in vae.get_params(True)])
# ====== Optimizer ====== #
cost, updates = vae.get_optimization(
objective=odin.objectives.categorical_crossentropy,
optimizer=lambda x, y: odin.optimizers.sgd(x, y, learning_rate=0.01),
globals=True, training=True)
f = T.function(inputs=vae.input_var, outputs=cost, updates=updates)
cost = []
niter = ds['X_train'].iter_len() / 64
for j in xrange(2):
for i, x in enumerate(ds['X_train'].iter(64)):
if x.shape[0] != 64: continue
cost.append(f(x))
odin.logger.progress(i, niter, str(cost[-1]))
odin.visual.print_bar(cost)
# ====== reconstruc ====== #
f = T.function(
inputs=vae.input_var,
outputs=vae.set_reconstruction_mode(True)(training=False))
X_test = ds['X_test'][:16]
X_reco = f(X_test)[0].reshape(-1, 28, 28)
odin.visual.plot_images(X_test)
odin.visual.plot_images(X_reco)
odin.visual.plot_show()
def test_rbm():
batch_size = 32
persistent_chain = T.variable(numpy.zeros((batch_size, 500)))
input_ = odin.nnet.Dense((None, 28, 28), num_units=784)
input_ = (None, 28, 28)
rbm = odin.nnet.RBM(input_, 500, persistent=persistent_chain)
print('Input variables:', rbm.input_var)
print('Output variables:', rbm.output_var)
sgd = lambda x, y: odin.optimizers.sgd(x, y, learning_rate=0.01)
cost, updates = rbm.get_optimization(
optimizer=sgd, globals=True, objective=odin.objectives.contrastive_divergence)
print('Building functions...')
train_rbm = T.function(
inputs=rbm.input_var,
outputs=cost,
updates=updates
)
cost = []
niter = ds['X_train'].iter_len() / batch_size
for i, x in enumerate(ds['X_train'].iter(batch_size, seed=13)):
if x.shape[0] != batch_size: continue
# x = x.astype(int) # this one can mess up the whole training process
cost.append(train_rbm(x))
odin.logger.progress(i, niter, title='%.5f' % cost[-1])
odin.visual.print_bar(cost, bincount=20)
vis_mfc = rbm.set_sampling_steps(1).set_reconstruction_mode(True)()
print('Building functions...')
sample_rbm = T.function(
inputs=rbm.input_var,
outputs=vis_mfc,
updates=updates)
test_x = ds['X_test'].value
for i in xrange(3):
t = numpy.random.randint(test_x.shape[0] - 16)
x = test_x[t:t + 16]
x_mean = sample_rbm(x)[0]
odin.visual.plot_images(x)
odin.visual.plot_images(x_mean)
plt.show(block=False)
raw_input('<Enter>')
plt.close('all')
def test_dA(): # AutoEncoder
dA = odin.nnet.AutoEncoder((None, 28, 28),
num_units=512, denoising=0.3, contractive=False,
nonlinearity=T.sigmoid)
sgd = lambda x, y: odin.optimizers.sgd(x, y, learning_rate=0.01)
cost, updates = dA.get_optimization(
objective=odin.objectives.categorical_crossentropy,
optimizer=sgd,
globals=True)
f_train = T.function(
inputs=dA.input_var,
outputs=cost,
updates=updates)
cost = []
niter = ds['X_train'].iter_len() / 64
choices = None
for _ in xrange(3):
for i, x in enumerate(ds['X_train'].iter(64)):
cost.append(f_train(x))
odin.logger.progress(i, niter, title=str(cost[-1]))
print()
odin.visual.print_bar(cost, bincount=20)
W = T.get_value(dA.get_params(False)[0]).T.reshape(-1, 28, 28)
if choices is None:
choices = np.random.choice(
np.arange(W.shape[0]), size=16, replace=False)
W = W[choices]
odin.visual.plot_images(W)
plt.show(block=False)
raw_input('<enter>')
f_pred = T.function(
inputs=dA.input_var,
outputs=dA.set_reconstruction_mode(True)())
for i in xrange(3):
t = np.random.randint(ds['X_test'].shape[0] - 16)
X = ds['X_test'][t:t + 16]
X_pred = f_pred(X)[0]
odin.visual.plot_images(X)
odin.visual.plot_images(X_pred)
odin.visual.plot_show()
def test_aED(): #AutoEncoderDecoder
Wa = T.variable(T.np_glorot_uniform(shape=(784, 256)), name='W')
Wb = T.variable(T.np_glorot_uniform(shape=(256, 128)), name='W')
d1a = odin.nnet.Dense((None, 28, 28), num_units=256, W=Wa, name='d1a',
nonlinearity=T.sigmoid)
d1b = odin.nnet.Dense(d1a, num_units=128, W=Wb, name='d1b',
nonlinearity=T.sigmoid)
# or d1b, (None, 128) as incoming
d2a = odin.nnet.Dense((None, 128), num_units=256, W=Wb.T, name='d2a',
nonlinearity=T.sigmoid)
d2b = odin.nnet.Dense(d2a, num_units=784, W=Wa.T, name='d2b',
nonlinearity=T.sigmoid)
aED = odin.nnet.AutoEncoderDecoder(d1b, d2b)
sgd = lambda x, y: odin.optimizers.sgd(x, y, learning_rate=0.01)
cost, updates = aED.get_optimization(
objective=odin.objectives.categorical_crossentropy,
optimizer=sgd,
globals=True)
f_train = T.function(
inputs=aED.input_var,
outputs=cost,
updates=updates)
cost = []
niter = ds['X_train'].iter_len() / 64
choices = None
for _ in xrange(3):
for i, x in enumerate(ds['X_train'].iter(64)):
cost.append(f_train(x))
odin.logger.progress(i, niter, title=str(cost[-1]))
print()
odin.visual.print_bar([i for i in cost if i == i], bincount=20)
W = T.get_value(aED.get_params(True)[0]).T.reshape(-1, 28, 28)
if choices is None:
choices = np.random.choice(
np.arange(W.shape[0]), size=16, replace=False)
W = W[choices]
odin.visual.plot_images(W)
plt.show(block=False)
raw_input('<enter>')
# ====== Output reconstruction ====== #
f_pred = T.function(
inputs=aED.input_var,
outputs=aED.set_reconstruction_mode(True)())
for i in xrange(3):
t = np.random.randint(ds['X_test'].shape[0] - 16)
X = ds['X_test'][t:t + 16]
X_pred = f_pred(X)[0].reshape(-1, 28, 28)
odin.visual.plot_images(X)
odin.visual.plot_images(X_pred)
odin.visual.plot_show()
# ====== OUtput hidden activation ====== #
f_pred = T.function(
inputs=aED.input_var,
outputs=aED())
X = ds['X_test'][t:t + 16]
print(f_pred(X)[0].shape)
f = odin.nnet.Dense(f,
num_units=128,
nonlinearity=T.relu)
f = odin.nnet.Dropout(f, p=0.5)
f = odin.nnet.Dense(f, num_units=nb_classes, nonlinearity=T.softmax)
print('Input variables:', f.input_var)
print('Outputs variables:', f.output_var)
# ====== create cost and updates based on given objectives and optimizers ====== #
print('\nBuilding training functions ...')
cost, updates = f.get_optimization(
objective=odin.objectives.categorical_crossentropy,
optimizer=odin.optimizers.adadelta,
training=True)
f_train = T.function(
inputs=f.input_var + f.output_var,
outputs=cost,
updates=updates)
# if you don't specify th eoptimizer only calculate the objectives
print('\nBuilding monitoring functions ...')
monitor_cost, _ = f.get_optimization(
objective=odin.objectives.mean_categorical_accuracy,
optimizer=None,
training=False)
f_monitor = T.function(
inputs=f.input_var + f.output_var,
outputs=monitor_cost)
# ====== Start the trianing process ====== #
cost = []
niter_train = ds['X_train'].iter_len() // batch_size
h1 = h[:, 0:10] # 1x10
h2 = h[:, 10:20]
h3 = h[:, 20:30]
h4 = h[:, 30:40]
test = (T.dot(x1, T.transpose(h1)) +
T.dot(x2, T.transpose(h2)) +
T.dot(x3, T.transpose(h3)) +
T.dot(x4, T.transpose(h4)))
return test + mem
mem, updates = T.scan(step1,
sequences=[inputs, hidden],
outputs_info=[T.zeros(shape=(seq_len, 1))]
)
f1 = T.function(inputs=[], outputs=mem)
print(f1().shape)
# ====== second approach ====== #
def step2(x1, x2, x3, x4, h, mem):
h = h.dimshuffle('x', 0) # 1x20
h1 = T.dot(h, W1) # 1x10
h2 = T.dot(h, W2)
h3 = T.dot(h, W3)
h4 = T.dot(h, W4)
test = (T.dot(x1, T.transpose(h1)) +
T.dot(x2, T.transpose(h2)) +
T.dot(x3, T.transpose(h3)) +
T.dot(x4, T.transpose(h4)))
# build the model: 2 stacked LSTM
print('Build model...')
f = odin.nnet.LSTM((None, maxlen, len(chars)), num_units=256)
f = odin.nnet.Dropout(f, p=0.2)
f = odin.nnet.LSTM(f, num_units=256, only_return_final=True)
f = odin.nnet.Dense(f, num_units=len(chars), nonlinearity=T.softmax)
print('Input variables:', f.input_var)
print('Output variables:', f.output_var)
cost, updates = f.get_optimization(
objective=odin.objectives.mean_categorical_crossentropy,
optimizer=odin.optimizers.rmsprop)
print('Build training function...')
f_train = T.function(
inputs=f.input_var + f.output_var,
outputs=cost,
updates=updates)
f_pred = T.function(
inputs=f.input_var,
outputs=f(training=False)[0]
)
# train the model, output generated text after each iteration
for iteration in range(1, 60):
print()
print('-' * 50)
print('Iteration', iteration)
seed = T.get_random_magic_seed()
cost = []
niter = X.shape[0] // 128
for k, (i, j) in enumerate(
seq3 = T.variable(np.arange(5))
nonseq1 = T.variable(1.)
nonseq2 = T.variable(2.)
([o1, o2], updates) = theano.scan(
fn=step,
sequences=[seq1, seq2, seq3],
outputs_info=[T.zeros((2, 2)), T.ones((2, 2))],
non_sequences=[nonseq1, nonseq2],
n_steps=None,
truncate_gradient=-1,
go_backwards=False)
f1 = T.function(
inputs=[],
outputs=[o1, o2],
updates=updates)
a, b = f1()
print(a.shape)
o1, o2 = T.loop(step,
sequences=[seq1, seq2, seq3],
outputs_info=[T.zeros((2, 2)), T.ones((2, 2))],
non_sequences=[nonseq1, nonseq2],
n_steps=5)
print(o1, o2)
f2 = T.function(
inputs=[],
outputs=[o1, o2],
updates=updates)
a, b = f2()