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_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)
# =========================================================================== # Conclusion: # Stack parameters and precompute_inputs significantly increase speed # =========================================================================== from __future__ import print_function, division import os os.environ['ODIN'] = 'cpu,float32,theano' import odin from odin import tensor as T import numpy as np import time batch_size = 128 seq_len = 512 X = T.variable(np.random.rand(batch_size, seq_len, 20)) W1 = T.variable(np.random.rand(20, 10)) W2 = T.variable(np.random.rand(20, 10)) W3 = T.variable(np.random.rand(20, 10)) W4 = T.variable(np.random.rand(20, 10)) hidden = T.variable(np.random.rand(batch_size, 20)) # ====== First approach ====== # W = T.concatenate((W1, W2, W3, W4), axis=1) # 20x40 inputs = T.dot(X, W) #batch_sizexseq_lenx40 inputs1 = T.dot(X, W1) inputs2 = T.dot(X, W2) inputs3 = T.dot(X, W3) inputs4 = T.dot(X, W4)
from __future__ import print_function, division
import numpy as np
import os
os.environ['ODIN'] = 'theano,float32'
from odin import tensor as T
import time
import theano
def step(s1, s2, s3, o1, o2, n1, n2):
return o1, o2
seq1 = T.variable(np.arange(10))
seq2 = T.variable(np.arange(20))
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()
