def get_denoising_error(self, dataset, cost, noise, corruption_level):
""" This function returns the denoising error over the dataset """
batch_size = 100
# compute number of minibatches for training, validation and testing
n_train_batches = get_constant(dataset.shape[0]) / batch_size
# allocate symbolic variables for the data
index = T.lscalar() # index to a [mini]batch
cost, updates = self.get_cost_updates(
corruption_level=corruption_level,
learning_rate=0.,
noise=noise,
cost=cost)
get_error = theano.function(
[index],
cost,
updates={},
givens={
self.x: dataset[index * batch_size:(index + 1) * batch_size]
},
name='get_error')
denoising_error = []
# go through the dataset
for batch_index in xrange(n_train_batches):
denoising_error.append(get_error(batch_index))
return numpy.mean(denoising_error)
def fit(self, dataset, learning_rate, batch_size=20, epochs=50, cost='CE',
noise='gaussian', corruption_level=0.3, reg=0.):
""" This function fits the dA to the dataset given
some hyper-parameters and returns the loss evolution
and the time spent during training """
# compute number of minibatches for training, validation and testing
n_train_batches = get_constant(dataset.shape[0]) / batch_size
# allocate symbolic variables for the data
index = T.lscalar() # index to a [mini]batch
cost, updates = self.get_cost_updates(corruption_level = corruption_level,
learning_rate = learning_rate,
noise = noise,
cost = cost,
reg = reg)
train_da = theano.function([index],
cost,
updates = updates,
givens = {self.x:dataset[index*batch_size:(index+1)*batch_size]},
name ='train_da'
)
start_time = time.clock()
############
# TRAINING #
############
loss = []
print '... training model...'
# go through training epochs
for epoch in xrange(epochs):
tic = time.clock()
# go through trainng set
c = []
for batch_index in xrange(int(n_train_batches)):
c.append(train_da(batch_index))
toc = time.clock()
loss.append(numpy.mean(c))
print 'Training epoch %d, time spent (min) %f, cost ' \
%(epoch,(toc-tic)/60.), numpy.mean(c)
toc = tic
end_time = time.clock()
training_time = (end_time - start_time)/60.
return training_time, loss
def get_denoising_error(self, dataset, cost, noise, corruption_level):
""" This function returns the denoising error over the dataset """
batch_size = 100
# compute number of minibatches for training, validation and testing
n_train_batches = get_constant(dataset.shape[0]) / batch_size
# allocate symbolic variables for the data
index = T.lscalar() # index to a [mini]batch
cost, updates = self.get_cost_updates(corruption_level = corruption_level,
learning_rate = 0.,
noise = noise,
cost = cost)
get_error = theano.function([index], cost, updates = {}, givens = {
self.x:dataset[index*batch_size:(index+1)*batch_size]},
name='get_error')
denoising_error = []
# go through the dataset
for batch_index in xrange(n_train_batches):
denoising_error.append(get_error(batch_index))
return numpy.mean(denoising_error)
def main_train(dataset, save_dir, n_hidden, tied_weights, act_enc,
act_dec, learning_rate, batch_size, epochs, cost_type,
noise_type, corruption_level, reg, normalize_on_the_fly = False, do_pca = False,
num_components = numpy.inf, min_variance = .0, do_create_submission = False,
submission_dir = None):
''' main function used for training '''
datasets = load_data(dataset, not normalize_on_the_fly, normalize_on_the_fly)
train_set_x = datasets[0]
valid_set_x = datasets[1]
test_set_x = datasets[2]
#################
# Premier block #
#################
from scikits.learn.pca import PCA
pca = PCA(n_components = 75, whiten = True)
print '... train PCA'
pca.fit(train_set_x.value)
print '... explained variance'
print pca.explained_variance_
print '... transform valid/test'
train_r = pca.transform(train_set_x.value)
valid_r = pca.transform(valid_set_x.value)
test_r = pca.transform(test_set_x.value)
train_set_x.value = train_r
valid_set_x.value = valid_r
test_set_x.value = test_r
del PCA, train_r, valid_r, test_r
##################
# Deuxieme Block #
##################
da1 = dA()
save_dir1 = '/data/lisa/exp/mesnilgr/ift6266h11/GREGAVI2_/55'
da1.load(save_dir1)
index = T.lscalar() # index to a [mini]batch
x = theano.tensor.matrix('input')
get_rep_train = theano.function([index], da1.get_hidden_values(x), updates = {},
givens = {x:train_set_x},
name = 'get_rep_train')
get_rep_valid = theano.function([index], da1.get_hidden_values(x), updates = {},
givens = {x:valid_set_x},
name = 'get_rep_valid')
get_rep_test = theano.function([index], da1.get_hidden_values(x), updates = {},
givens = {x:test_set_x},
name = 'get_rep_test')
# valid and test representations
train_r = get_rep_train(0)
valid_r = get_rep_valid(0)
test_r = get_rep_test(0)
train_set_x.value = train_r
valid_set_x.value = valid_r
test_set_x.value = test_r
del train_r, valid_r, test_r
d = get_constant(train_set_x.shape[1])
da = dA(n_visible = d, n_hidden = n_hidden,
tied_weights = tied_weights,
act_enc = act_enc, act_dec = act_dec)
time_spent, loss = da.fit(train_set_x, learning_rate, batch_size, epochs,
cost_type, noise_type, corruption_level, reg)
if save_dir:
da.save(save_dir)
denoising_error = da.get_denoising_error(valid_set_x, cost_type,
noise_type, corruption_level)
print 'Training complete in %f (min) with final denoising error %f' \
%(time_spent,denoising_error)
if do_pca:
print "... computing PCA"
x = theano.tensor.matrix('input')
get_rep_train = theano.function([], da.get_hidden_values(x), updates = {},
givens = {x:train_set_x}, name = 'get_rep_valid')
pca_trainer = pca.PCATrainer(get_rep_train(), num_components = num_components,
min_variance = min_variance)
pca_trainer.updates()
pca_trainer.save(save_dir)
if do_create_submission:
print "... creating submission"
if submission_dir is None:
submission_dir = save_dir
create_submission(dataset, save_dir, submission_dir, normalize_on_the_fly, do_pca)
return denoising_error, time_spent, loss
def main_train(dataset,
save_dir,
n_hidden,
tied_weights,
act_enc,
act_dec,
learning_rate,
batch_size,
epochs,
cost_type,
noise_type,
corruption_level,
reg,
normalize_on_the_fly=False,
do_pca=False,
num_components=numpy.inf,
min_variance=.0,
do_create_submission=False,
submission_dir=None):
''' main function used for training '''
datasets = load_data(dataset, not normalize_on_the_fly,
normalize_on_the_fly)
train_set_x = datasets[0]
valid_set_x = datasets[1]
test_set_x = datasets[2]
#################
# Premier block #
#################
from scikits.learn.pca import PCA
pca = PCA(n_components=75, whiten=True)
print '... train PCA'
pca.fit(train_set_x.value)
print '... explained variance'
print pca.explained_variance_
print '... transform valid/test'
train_r = pca.transform(train_set_x.value)
valid_r = pca.transform(valid_set_x.value)
test_r = pca.transform(test_set_x.value)
train_set_x.value = train_r
valid_set_x.value = valid_r
test_set_x.value = test_r
del PCA, train_r, valid_r, test_r
##################
# Deuxieme Block #
##################
da1 = dA()
save_dir1 = '/data/lisa/exp/mesnilgr/ift6266h11/GREGAVI2_/55'
da1.load(save_dir1)
index = T.lscalar() # index to a [mini]batch
x = theano.tensor.matrix('input')
get_rep_train = theano.function([index],
da1.get_hidden_values(x),
updates={},
givens={x: train_set_x},
name='get_rep_train')
get_rep_valid = theano.function([index],
da1.get_hidden_values(x),
updates={},
givens={x: valid_set_x},
name='get_rep_valid')
get_rep_test = theano.function([index],
da1.get_hidden_values(x),
updates={},
givens={x: test_set_x},
name='get_rep_test')
# valid and test representations
train_r = get_rep_train(0)
valid_r = get_rep_valid(0)
test_r = get_rep_test(0)
train_set_x.value = train_r
valid_set_x.value = valid_r
test_set_x.value = test_r
del train_r, valid_r, test_r
d = get_constant(train_set_x.shape[1])
da = dA(n_visible=d,
n_hidden=n_hidden,
tied_weights=tied_weights,
act_enc=act_enc,
act_dec=act_dec)
time_spent, loss = da.fit(train_set_x, learning_rate, batch_size, epochs,
cost_type, noise_type, corruption_level, reg)
if save_dir:
da.save(save_dir)
denoising_error = da.get_denoising_error(valid_set_x, cost_type,
noise_type, corruption_level)
print 'Training complete in %f (min) with final denoising error %f' \
%(time_spent,denoising_error)
if do_pca:
print "... computing PCA"
x = theano.tensor.matrix('input')
get_rep_train = theano.function([],
da.get_hidden_values(x),
updates={},
givens={x: train_set_x},
name='get_rep_valid')
pca_trainer = pca.PCATrainer(get_rep_train(),
num_components=num_components,
min_variance=min_variance)
pca_trainer.updates()
pca_trainer.save(save_dir)
if do_create_submission:
print "... creating submission"
if submission_dir is None:
submission_dir = save_dir
create_submission(dataset, save_dir, submission_dir,
normalize_on_the_fly, do_pca)
return denoising_error, time_spent, loss
def fit(self,
dataset,
learning_rate,
batch_size=20,
epochs=50,
cost='CE',
noise='gaussian',
corruption_level=0.3,
reg=0.):
""" This function fits the dA to the dataset given
some hyper-parameters and returns the loss evolution
and the time spent during training """
# compute number of minibatches for training, validation and testing
n_train_batches = get_constant(dataset.shape[0]) / batch_size
# allocate symbolic variables for the data
index = T.lscalar() # index to a [mini]batch
cost, updates = self.get_cost_updates(
corruption_level=corruption_level,
learning_rate=learning_rate,
noise=noise,
cost=cost,
reg=reg)
train_da = theano.function([index],
cost,
updates=updates,
givens={
self.x:
dataset[index * batch_size:(index + 1) *
batch_size]
},
name='train_da')
start_time = time.clock()
############
# TRAINING #
############
loss = []
print '... training model...'
# go through training epochs
for epoch in xrange(epochs):
tic = time.clock()
# go through trainng set
c = []
for batch_index in xrange(int(n_train_batches)):
c.append(train_da(batch_index))
toc = time.clock()
loss.append(numpy.mean(c))
print 'Training epoch %d, time spent (min) %f, cost ' \
%(epoch,(toc-tic)/60.), numpy.mean(c)
toc = tic
end_time = time.clock()
training_time = (end_time - start_time) / 60.
return training_time, loss
