def addLayer(self, idx):
"""
:param idx: index of the layer(in the list passed to initialize the network) to be added. Note 0 is the input\
layers
:return: return a list of newly created variables that has to initialized
"""
with tf.variable_scope('forward_variables', reuse=False):
self.layers = self.layers[:-1]
print 'layers len', len(self.layers)
if len(self.layers) == 0:
inpt = self.input
else:
inpt = self.layers[-1].activations
self.layers.append(
HiddenLayer(self.layer_dims[idx - 1], self.layer_dims[idx],
inpt, 'layer' + str(idx)))
self.layers.append(
LinearLayer(self.layer_dims[-2], self.layer_dims[-1],
self.layers[-1].activations,
str(idx) + 'layerNet_output'))
self.__buildLossGraph__()
params = tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES,
scope='forward_variables/layer' + str(idx))
params += tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES,
scope='forward_variables_' + str(idx))
params += tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES,
scope='forward_variables/' + str(idx) +
'layerNet_output')
print 'params are ', params
self.buildEvalGraph()
self.buildSummaryGraph()
return params
def __buildFullGraph__(self):
inpt = self.input
for idx in range(1, len(self.layer_dims) - 1):
self.layers.append(
HiddenLayer(self.layer_dims[idx - 1], self.layer_dims[idx],
inpt, 'layer' + str(idx)))
inpt = self.layers[-1].activations
return inpt
def forward_propagation(self, x):
"""Forward Progation of a single sample."""
tau = len(x)
prev_h = sp.zeros(self.n_hiddens)
cells = [None for i in range(tau)]
for i in range(tau):
# Compute the hidden state
time_input = x[i]
hidden = HiddenLayer()
hidden.forward(self.U, time_input, self.W, prev_h, self.b)
# Compute the output
prev_h = hidden.h
output = OutputLayer()
output.forward(self.V, hidden.h, self.c)
cells[i] = (hidden, output)
return cells
def __init_layers(self, layer_spec):
self.layers = []
last_index = len(layer_spec) - 1
for i, size in enumerate(layer_spec):
if i == 0:
self.layers.append(InputLayer(size, self.activation_fn))
elif i == last_index:
self.layers.append(OutputLayer(size, self.activation_fn))
else:
self.layers.append(HiddenLayer(size, self.activation_fn))
for i in range(len(self.layers) - 1):
self.__join_layers(self.layers[i], self.layers[i+1])
def __init__(self,
architecture=[784, 100, 10],
activation='sigmoid',
learning_rate=0.1,
momentum=0.5,
weight_decay=1e-4,
dropout=0.5,
early_stopping=True,
seed=99):
"""
Neural network model initializer.
"""
# Attributes
self.architecture = architecture
self.activation = activation
self.learning_rate = learning_rate
self.momentum = momentum
self.weight_decay = weight_decay
self.dropout = dropout
self.early_stopping = early_stopping
self.seed = seed
# Turn `activation` and `learning_rate` to class instances
if not isinstance(self.activation, Activation):
self.activation = Activation(self.activation)
if not isinstance(self.learning_rate, LearningRate):
self.learning_rate = LearningRate(self.learning_rate)
# Initialize a list of layers
self.layers = []
for i, (n_in,
n_out) in enumerate(zip(architecture[:-2],
architecture[1:-1])):
l = HiddenLayer('layer{}'.format(i), n_in, n_out, self.activation,
self.learning_rate, self.momentum,
self.weight_decay, self.dropout, self.seed + i)
self.layers.append(l)
# Output layer
n_in, n_out = architecture[-2], architecture[-1]
l = OutputLayer('output_layer', n_in, n_out, self.learning_rate,
self.momentum, self.weight_decay, self.dropout,
self.seed + i + 1)
self.layers.append(l)
# Training updates
self.epoch = 0
self.training_error = []
self.validation_error = []
self.training_loss = []
self.validation_loss = []
def build_layers(self):
layers = []
for i, layer_desc in enumerate(self.layer_descriptions):
units = self._calc_num_units(i)
constructor_params = {
'n_in': units[0],
'n_out': units[1],
'batch_size': self.batch_size,
'k': layer_desc['k'],
'activation': layer_desc['activation'],
'name': 'l_layer_%d' % i
}
layers.append(HiddenLayer(**constructor_params))
return layers
def process(train_source_file, train_target_file, dev_source_file, dev_target_file, test_source_file, test_target_predictions):
train_source_data = get_data(train_source_file)
train_target_data = get_data(train_target_file)
dev_source_data = get_data(dev_source_file)
dev_target_data = get_data(dev_target_file)
test_source_data = get_data(test_source_file)
source_words = set(itertools.chain(*(train_source_data + dev_source_data)))
target_words = set(itertools.chain(*(train_target_data + dev_target_data)))
source_word_to_idx = dict((v, i) for i, v in enumerate(source_words))
target_word_to_idx = dict((v, i) for i, v in enumerate(target_words))
target_idx_to_word = dict((i, v) for i, v in enumerate(target_words))
# Preparing data
train_source_data = [[source_word_to_idx[word] for word in sentence] for sentence in train_source_data]
dev_source_data = [[source_word_to_idx[word] for word in sentence] for sentence in dev_source_data]
train_target_data = [[target_word_to_idx[word] for word in sentence] for sentence in train_target_data]
dev_target_data = [[target_word_to_idx[word] for word in sentence] for sentence in dev_target_data]
test_source_data = [[source_word_to_idx[word] for word in sentence] for sentence in test_source_data]
# Changing the input numpy arrays to tensor vectors
source_sentence = T.ivector()
target_sentence = T.ivector()
target_gold = T.ivector()
source_word_embedding = 128
target_word_embedding = 128
source_hidden_embedding = 256
target_hidden_embedding = 256
hyper_params = []
vocab_source_size = len(source_words)
vocab_target_size = len(target_words)
source_lookup = EmbeddingLayer(vocab_source_size, source_word_embedding)
target_lookup = EmbeddingLayer(vocab_target_size, target_word_embedding)
hyper_params += source_lookup.params + target_lookup.params
source_lstm_forward = LSTM(source_word_embedding, source_hidden_embedding, with_batch=False)
target_lstm = LSTM(256, target_hidden_embedding, with_batch=False)
hyper_params += source_lstm_forward.params + target_lstm.params[:-1] # Removing the last output
tanh_layer = HiddenLayer(source_hidden_embedding, target_word_embedding, activation='tanh')
# weighted_attention_vector + target_sentence_embedding + last encoded vector
softmax_layer = HiddenLayer(source_hidden_embedding + target_hidden_embedding, vocab_target_size, activation='softmax')
hyper_params += softmax_layer.params
# Getting the source and target embeddings
source_sentence_emb = source_lookup.link(source_sentence)
target_sentence_emb = target_lookup.link(target_sentence)
last_h = source_lstm_forward.link(source_sentence_emb)
# Repeating the last encoder_output for target word length times
# First changing the last encoder_output into a row and vector and repeating target word length times
broadcast_source_context = T.repeat(last_h.dimshuffle('x', 0), target_sentence_emb.shape[0], axis=0)
broadcast_source_context = tanh_layer.link(broadcast_source_context)
target_sentence_emb = T.concatenate((target_sentence_emb, broadcast_source_context), axis=1)
target_lstm.h_0 = last_h
target_lstm.link(target_sentence_emb)
# Attention
ht = target_lstm.h.dot(source_lstm_forward.h.transpose())
# Normalizing across rows to get attention probabilities
attention_weights = T.nnet.softmax(ht)
# Weighted source_context_vector based on attention probabilities
attention_weighted_vector = attention_weights.dot(source_lstm_forward.h)
# Concatenating the hidden state from lstm and weighted source_context_vector
pred = T.concatenate([attention_weighted_vector, target_lstm.h], axis=1)
# Final softmax to get the best translation word
prediction = softmax_layer.link(pred)
# Computing the cross-entropy loss
loss = T.nnet.categorical_crossentropy(prediction, target_gold).mean()
updates = LearningMethod(clip=5.0).get_updates('adam', loss, hyper_params)
# For training
train_function = theano.function(
inputs=[source_sentence, target_sentence, target_gold],
outputs=loss,
updates=updates
)
# For prediction
predict_function = theano.function(
inputs=[source_sentence, target_sentence],
outputs=prediction,
)
def get_translations(source_sentences):
translated_sentences = []
for sentence in source_sentences:
source_sentence = np.array(sentence).astype(np.int32)
translated_so_far = [target_word_to_idx['<s>']]
while True:
next_word = predict_function(source_sentence, translated_so_far).argmax(axis=1)[-1] # Get the last translated word
translated_so_far.append(next_word)
if next_word == target_word_to_idx['</s>']:
translated_sentences.append([target_idx_to_word[x] for x in translated_so_far])
break
return translated_sentences
iterations = 100
batch_size = 10000
c = 0
best_score = -1.0 * sys.maxint
dev_preds = []
test_preds = []
dev_best_preds = []
test_best_preds = []
for i in xrange(iterations):
print 'Iteration {}'.format(i)
random_indexes = range(len(train_source_data))
np.random.shuffle(random_indexes)
loss = []
for sent_no, index in enumerate(random_indexes):
src_vector = np.array(train_source_data[index]).astype(np.int32)
tgt_vector = np.array(train_target_data[index]).astype(np.int32)
c = train_function(src_vector, tgt_vector[:-1], tgt_vector[1:])
loss.append(c)
if sent_no % batch_size == 0 and sent_no > 0:
dev_preds = get_translations(dev_source_data)
dev_bleu_score = get_bleu(dev_preds)
if dev_bleu_score > best_score:
best_score = dev_bleu_score
dev_best_preds = dev_preds[:]
# Decoding the test once the dev reaches the baseline
if dev_bleu_score >= 28:
test_preds = get_translations(test_source_data)
test_best_preds = test_preds[:]
print 'Dev bleu score {}'.format(dev_bleu_score)
print 'Iteration: {} Loss {}'.format(i, 1.0 * (sum(loss))/len(loss))
dev_output_fp = open('dev_output.txt', 'w')
test_output_fp = open(test_target_predictions, 'w')
for pred in dev_best_preds:
dev_output_fp.write(' '.join(pred) + '\n')
dev_output_fp.close()
for pred in test_best_preds:
test_output_fp.write(' '.join(pred) + '\n')
test_output_fp.close()
def main():
config = ConfigParser.ConfigParser()
train_src = load_data(config.get("Data", "train_src"))
dev_src = load_data(config.get("Data", "dev_src"))
test_src = load_data(config.get("Data", "test_src"))
train_tgt = load_data(config.get("Data", "train_tgt"))
dev_tgt = load_data(config.get("Data", "dev_tgt"))
test_tgt = load_data(config.get("Data", "test_tgt"))
assert len(train_src) == len(train_tgt)
UD_path = config.get("Path", "UD")
sys.path.append(UD_path + "/")
words_src = get_words(train_src + dev_src)
words_tgt = get_words(train_tgt + dev_tgt)
source_word2ind = {word: ind for ind, word in enumerate(words_src)}
source_ind2word = {ind: word for ind, word in enumerate(words_src)}
target_word2ind = {word: ind for ind, word in enumerate(words_tgt)}
target_ind2word = {ind: word for ind, word in enumerate(words_tgt)}
# In[24]:
#
# Model
#
src_emb_dim = 256 # source word embedding dimension
tgt_emb_dim = 256 # target word embedding dimension
src_lstm_hid_dim = 512 # source LSTMs hidden dimension
tgt_lstm_hid_dim = 2 * src_lstm_hid_dim # target LSTM hidden dimension
proj_dim = 104 # size of the first projection layer
dropout = 0.5 # dropout rate
n_src = len(source_word2ind) # number of words in the source language
n_tgt = len(target_word2ind) # number of words in the target language
# Parameters
params = []
# Source words + target words embeddings layer
src_lookup = EmbeddingLayer(n_src, src_emb_dim, name="src_lookup") # lookup table for source words
tgt_lookup = EmbeddingLayer(n_tgt, tgt_emb_dim, name="tgt_lookup") # lookup table for target words
params += src_lookup.params + tgt_lookup.params
# LSTMs
src_lstm_for = LSTM(src_emb_dim, src_lstm_hid_dim, name="src_lstm_for", with_batch=False)
src_lstm_rev = LSTM(src_emb_dim, src_lstm_hid_dim, name="src_lstm_rev", with_batch=False)
tgt_lstm = LSTM(2 * tgt_emb_dim, tgt_lstm_hid_dim, name="tgt_lstm", with_batch=False)
params += src_lstm_for.params + src_lstm_rev.params + tgt_lstm.params[:-1]
# Projection layers
proj_layer1 = HiddenLayer(tgt_lstm_hid_dim + 2 * src_lstm_hid_dim, n_tgt, name="proj_layer1", activation="softmax")
proj_layer2 = HiddenLayer(2 * src_lstm_hid_dim, tgt_emb_dim, name="proj_layer2", activation="tanh")
params += proj_layer1.params # + proj_layer2.params
# Train status
is_train = T.iscalar("is_train")
# Input sentence
src_sentence = T.ivector()
# Current output translation
tgt_sentence = T.ivector()
# Gold translation
tgt_gold = T.ivector()
src_sentence_emb = src_lookup.link(src_sentence)
tgt_sentence_emb = tgt_lookup.link(tgt_sentence)
print "src_sentence_emb", src_sentence_emb.eval({src_sentence: src_sentence_t}).shape
print "tgt_sentence_emb", tgt_sentence_emb.eval({tgt_sentence: tgt_sentence_t}).shape
src_lstm_for.link(src_sentence_emb)
src_lstm_rev.link(src_sentence_emb[::-1, :])
print "src_lstm_for.h", src_lstm_for.h.eval({src_sentence: src_sentence_t}).shape
print "src_lstm_rev.h", src_lstm_rev.h.eval({src_sentence: src_sentence_t}).shape
src_context = T.concatenate([src_lstm_for.h, src_lstm_rev.h[::-1, :]], axis=1)
print "src_context", src_context.eval({src_sentence: src_sentence_t}).shape
tgt_lstm.h_0 = src_context[-1]
print "tgt sentence emb", tgt_sentence_emb.eval({src_sentence: src_sentence_t, tgt_sentence: tgt_sentence_t}).shape
tgt_lstm.link(tgt_sentence_emb)
print "tgt_lstm.h", tgt_lstm.h.eval({src_sentence: src_sentence_t, tgt_sentence: tgt_sentence_t}).shape
transition = tgt_lstm.h.dot(src_context.transpose())
transition = transition.dot(src_context)
print "transition", transition.eval({src_sentence: src_sentence_t, tgt_sentence: tgt_sentence_t}).shape
transition_last = T.concatenate([transition, tgt_lstm.h], axis=1)
print "transition_last", transition_last.eval({src_sentence: src_sentence_t, tgt_sentence: tgt_sentence_t}).shape
prediction = proj_layer1.link(transition_last)
print "prediction", prediction.eval({src_sentence: src_sentence_t, tgt_sentence: tgt_sentence_t}).shape
cost = T.nnet.categorical_crossentropy(prediction, tgt_gold).mean()
cost += beta * T.mean(
(tgt_lstm.h[:-1] ** 2 - tgt_lstm.h[1:] ** 2) ** 2
) # Regularization of RNNs from http://arxiv.org/pdf/1511.08400v6.pdf
print "cost", cost.eval({src_sentence: src_sentence_t, tgt_sentence: tgt_sentence_t, tgt_gold: tgt_gold_t})
# In[26]:
updates = LearningMethod(clip=5.0).get_updates("adam", cost, params)
# In[27]:
f_train = theano.function(inputs=[src_sentence, tgt_sentence, tgt_gold], outputs=cost, updates=updates)
# In[28]:
f_eval = theano.function(inputs=[src_sentence, tgt_sentence], outputs=prediction)
def main():
source_word2idx, source_idx2word = create_word_table(train_src)
target_word2idx, target_idx2word = create_word_table(train_tgt)
sys.stderr.write("Lookup table constructed." + "\n")
src_emb_dim = 256 # source word embedding dimension
tgt_emb_dim = 256 # target word embedding dimension
src_lstm_hid_dim = 512 # source LSTMs hidden dimension
tgt_lstm_hid_dim = 2 * src_lstm_hid_dim # target LSTM hidden dimension
dropout = 0.5 # dropout rate
n_src = len(source_word2idx) # number of words in the source language
n_tgt = len(target_word2idx) # number of words in the target language
# Parameters
params = []
# Source words + target words embeddings layer
# lookup table for source words
src_lookup = EmbeddingLayer(n_src, src_emb_dim, name='src_lookup')
# lookup table for target words
tgt_lookup = EmbeddingLayer(n_tgt, tgt_emb_dim, name='tgt_lookup')
params += src_lookup.params + tgt_lookup.params
# LSTMs
src_lstm_for = LSTM(src_emb_dim,
src_lstm_hid_dim,
name='src_lstm_for',
with_batch=False)
src_lstm_rev = LSTM(src_emb_dim,
src_lstm_hid_dim,
name='src_lstm_rev',
with_batch=False)
tgt_lstm = LSTM(2 * tgt_emb_dim,
tgt_lstm_hid_dim,
name='tgt_lstm',
with_batch=False)
params += src_lstm_for.params + src_lstm_rev.params + tgt_lstm.params[:-1]
# Projection layers
proj_layer1 = HiddenLayer(tgt_lstm_hid_dim + 2 * src_lstm_hid_dim,
n_tgt,
name='proj_layer1',
activation='softmax')
proj_layer2 = HiddenLayer(2 * src_lstm_hid_dim,
tgt_emb_dim,
name='proj_layer2',
activation='tanh')
# proj_layer2 = HiddenLayer(2 * src_lstm_hid_dim, tgt_emb_dim, name='proj_layer2', activation='tanh')
params += proj_layer1.params + proj_layer2.params
beta = 500
# Train status
is_train = T.iscalar('is_train')
# Input sentence
src_sentence = T.ivector()
# Current output translation
tgt_sentence = T.ivector()
# Gold translation
tgt_gold = T.ivector()
src_sentence_emb = src_lookup.link(src_sentence)
tgt_sentence_emb = tgt_lookup.link(tgt_sentence)
src_lstm_for.link(src_sentence_emb)
src_lstm_rev.link(src_sentence_emb[::-1, :])
src_context = T.concatenate([src_lstm_for.h, src_lstm_rev.h[::-1, :]],
axis=1)
tgt_lstm.h_0 = src_context[-1]
repeated_src_context = T.repeat(src_context[-1].dimshuffle('x', 0),
tgt_sentence_emb.shape[0],
axis=0)
repeated_src_context = proj_layer2.link(repeated_src_context)
tgt_sentence_emb = T.concatenate((tgt_sentence_emb, repeated_src_context),
axis=1)
tgt_lstm.link(tgt_sentence_emb)
# Attention
transition = tgt_lstm.h.dot(src_context.transpose())
transition = transition.dot(src_context)
transition_last = T.concatenate([transition, tgt_lstm.h], axis=1)
prediction = proj_layer1.link(transition_last)
cost = T.nnet.categorical_crossentropy(prediction, tgt_gold).mean()
# Regularization of RNNs from http://arxiv.org/pdf/1511.08400v6.pdf
cost += beta * T.mean((tgt_lstm.h[:-1]**2 - tgt_lstm.h[1:]**2)**2)
updates = LearningMethod(clip=5.0).get_updates('adam', cost, params)
f_train = theano.function(inputs=[src_sentence, tgt_sentence, tgt_gold],
outputs=cost,
updates=updates)
f_eval = theano.function(
inputs=[src_sentence, tgt_sentence],
outputs=prediction,
)
best_valid_preds = None
best_valid_score = -sys.maxint
best_test_preds = None
log = open('blue_valid_log.txt', 'w')
all_costs = []
batch_size = 50
n_epochs = 10
for i in xrange(n_epochs):
print 'Starting epoch %i' % i
indices = range(len(train_src))
np.random.shuffle(indices)
train_src_batch = [train_src[ind] for ind in indices]
train_tgt_batch = [train_tgt[ind] for ind in indices]
assert len(train_src_batch) == len(train_tgt_batch)
costs = []
for j in xrange(len(train_src_batch)):
new_cost = f_train(
np.array([source_word2idx[x]
for x in train_src_batch[j]]).astype(np.int32),
np.array([target_word2idx[x]
for x in train_tgt_batch[j]][:-1]).astype(np.int32),
np.array([target_word2idx[x]
for x in train_tgt_batch[j]][1:]).astype(np.int32))
all_costs.append((j, new_cost))
costs.append(new_cost)
if j % 300 == 0:
print j, np.mean(costs)
costs = []
if np.isnan(new_cost):
print 'NaN detected.'
break
if j % 10000 == 0 and j != 0:
valid_preds = get_predictions(source_word2idx,
target_word2idx,
target_idx2word,
f_eval,
mode="validation")
bleu = get_validation_bleu(valid_preds)
print '==================================================================='
print 'Epoch %i BLEU on Validation : %s ' % (i, bleu)
print '==================================================================='
if float(bleu) >= best_valid_score:
best_valid_score = float(bleu)
best_valid_preds = copy.deepcopy(valid_preds)
best_test_preds = get_predictions(source_word2idx,
target_word2idx,
target_idx2word,
f_eval,
mode="test")
print 'Found new best validation score %f ' % (
best_valid_score)
log.write('Epoch %d Minibatch %d BLEU on Validation : %s \n' %
(i, j, bleu))
# Store after epoch
fout = open('output' + str(i) + '.txt', 'w')
for line in best_test_preds:
fout.write(' '.join(line) + '\n')
fout.close()
log.close()
def create_cell(self):
# FIXME: Should create cells base on network structure
hidden = HiddenLayer(self.hidden_size)
output = OutputLayer(self.hidden_size)
return (hidden, output)
def main():
source_word2idx, source_idx2word = create_word_table(train_src)
target_word2idx, target_idx2word = create_word_table(train_tgt)
sys.stderr.write("Lookup table constructed." + "\n")
src_emb_dim = 256 # source word embedding dimension
tgt_emb_dim = 256 # target word embedding dimension
src_lstm_hid_dim = 512 # source LSTMs hidden dimension
tgt_lstm_hid_dim = 2 * src_lstm_hid_dim # target LSTM hidden dimension
dropout = 0.5 # dropout rate
n_src = len(source_word2idx) # number of words in the source language
n_tgt = len(target_word2idx) # number of words in the target language
# Parameters
params = []
# Source words + target words embeddings layer
# lookup table for source words
src_lookup = EmbeddingLayer(n_src, src_emb_dim, name='src_lookup')
# lookup table for target words
tgt_lookup = EmbeddingLayer(n_tgt, tgt_emb_dim, name='tgt_lookup')
params += src_lookup.params + tgt_lookup.params
# LSTMs
src_lstm_for = LSTM(src_emb_dim, src_lstm_hid_dim, name='src_lstm_for', with_batch=False)
src_lstm_rev = LSTM(src_emb_dim, src_lstm_hid_dim, name='src_lstm_rev', with_batch=False)
tgt_lstm = LSTM(2 * tgt_emb_dim, tgt_lstm_hid_dim, name='tgt_lstm', with_batch=False)
params += src_lstm_for.params + src_lstm_rev.params + tgt_lstm.params[:-1]
# Projection layers
proj_layer1 = HiddenLayer(tgt_lstm_hid_dim + 2 * src_lstm_hid_dim, n_tgt, name='proj_layer1', activation='softmax')
proj_layer2 = HiddenLayer(2 * src_lstm_hid_dim, tgt_emb_dim, name='proj_layer2', activation='tanh')
# proj_layer2 = HiddenLayer(2 * src_lstm_hid_dim, tgt_emb_dim, name='proj_layer2', activation='tanh')
params += proj_layer1.params + proj_layer2.params
beta = 500
# Train status
is_train = T.iscalar('is_train')
# Input sentence
src_sentence = T.ivector()
# Current output translation
tgt_sentence = T.ivector()
# Gold translation
tgt_gold = T.ivector()
src_sentence_emb = src_lookup.link(src_sentence)
tgt_sentence_emb = tgt_lookup.link(tgt_sentence)
src_lstm_for.link(src_sentence_emb)
src_lstm_rev.link(src_sentence_emb[::-1, :])
src_context = T.concatenate(
[src_lstm_for.h, src_lstm_rev.h[::-1, :]], axis=1)
tgt_lstm.h_0 = src_context[-1]
repeated_src_context = T.repeat(src_context[-1].dimshuffle('x', 0), tgt_sentence_emb.shape[0], axis=0)
repeated_src_context = proj_layer2.link(repeated_src_context)
tgt_sentence_emb = T.concatenate((tgt_sentence_emb, repeated_src_context), axis=1)
tgt_lstm.link(tgt_sentence_emb)
# Attention
transition = tgt_lstm.h.dot(src_context.transpose())
transition = transition.dot(src_context)
transition_last = T.concatenate([transition, tgt_lstm.h], axis=1)
prediction = proj_layer1.link(transition_last)
cost = T.nnet.categorical_crossentropy(prediction, tgt_gold).mean()
# Regularization of RNNs from http://arxiv.org/pdf/1511.08400v6.pdf
cost += beta * T.mean((tgt_lstm.h[:-1] ** 2 - tgt_lstm.h[1:] ** 2) ** 2)
updates = LearningMethod(clip=5.0).get_updates('adam', cost, params)
f_train = theano.function(
inputs=[src_sentence, tgt_sentence, tgt_gold],
outputs=cost,
updates=updates
)
f_eval = theano.function(
inputs=[src_sentence, tgt_sentence],
outputs=prediction,
)
best_valid_preds = None
best_valid_score = -sys.maxint
best_test_preds = None
log = open('blue_valid_log.txt', 'w')
all_costs = []
batch_size = 50
n_epochs = 10
for i in xrange(n_epochs):
print 'Starting epoch %i' % i
indices = range(len(train_src))
np.random.shuffle(indices)
train_src_batch = [train_src[ind] for ind in indices]
train_tgt_batch = [train_tgt[ind] for ind in indices]
assert len(train_src_batch) == len(train_tgt_batch)
costs = []
for j in xrange(len(train_src_batch)):
new_cost = f_train(
np.array([source_word2idx[x] for x in train_src_batch[j]]).astype(np.int32),
np.array([target_word2idx[x] for x in train_tgt_batch[j]][:-1]).astype(np.int32),
np.array([target_word2idx[x] for x in train_tgt_batch[j]][1:]).astype(np.int32)
)
all_costs.append((j, new_cost))
costs.append(new_cost)
if j % 300 == 0:
print j, np.mean(costs)
costs = []
if np.isnan(new_cost):
print 'NaN detected.'
break
if j % 10000 == 0 and j != 0:
valid_preds = get_predictions(
source_word2idx, target_word2idx, target_idx2word, f_eval, mode="validation")
bleu = get_validation_bleu(valid_preds)
print '==================================================================='
print 'Epoch %i BLEU on Validation : %s ' % (i, bleu)
print '==================================================================='
if float(bleu) >= best_valid_score:
best_valid_score = float(bleu)
best_valid_preds = copy.deepcopy(valid_preds)
best_test_preds = get_predictions(
source_word2idx, target_word2idx, target_idx2word, f_eval, mode="test")
print 'Found new best validation score %f ' % (best_valid_score)
log.write(
'Epoch %d Minibatch %d BLEU on Validation : %s \n' % (i, j, bleu))
# Store after epoch
fout = open('output' + str(i) + '.txt', 'w')
for line in best_test_preds:
fout.write(' '.join(line) + '\n')
fout.close()
log.close()
def test_train_little_only(
rng,
batch_size,
learning_rate,
n_hids,
n_epochs=1000,
L1_reg=0.0,
L2_reg=0.0001,
zero_last_layer_params=False,
):
def summarize_rates():
print "Learning rate: ", learning_rate.rate
l_learning_rate = shared(np.array(learning_rate.rate, dtype=config.floatX),
name='learning_rate')
index = T.lscalar('index')
l_x = T.matrix('l_x', dtype=config.floatX)
y = T.ivector('y')
print "Loading Data"
print "... MNIST"
dataset = 'mnist.pkl.gz'
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]
n_train_batches = train_set_x.get_value(borrow=True).shape[0] / batch_size
n_valid_batches = valid_set_x.get_value(borrow=True).shape[0] / batch_size
n_test_batches = test_set_x.get_value(borrow=True).shape[0] / batch_size
print "Building models"
print "... Building layers"
# Create network structure
x_size = train_set_x.shape[1].eval()
y_size = train_set_y.shape[0].eval()
n_in = x_size
n_out = n_hids
l_layers = []
b_layers = []
l_params = None
# Shared variable used for always activating one block in a layer as in the
# input and output layer
one_block_idxs = shared(np.zeros((batch_size, 1), dtype='int64'),
name='one_block_idxs')
l_layers.append(
HiddenLayer(n_in,
n_out,
batch_size,
k=0.1,
activation=T.tanh,
name='l_layer_' + str(len(l_layers))))
n_in = n_out
# l_layers.append(
# HiddenLayer(
# n_in,
# n_out,
# batch_size,
# k=0.1,
# activation=T.tanh,
# name='l_layer_' + str(len(l_layers))
# )
# )
n_out = 10
l_layers.append(
HiddenLayer(n_in,
n_out,
batch_size,
k=1,
activation=T.nnet.softmax,
name='l_layer_' + str(len(l_layers))))
if zero_last_layer_params:
l_layers[-1].W.set_value(0 * l_layers[-1].W.get_value())
l_layers[-1].b.set_value(0 * l_layers[-1].b.get_value())
for layer in l_layers:
print "\t%s" % layer
#for l_layer in l_layers:
# for param in l_layer.params:
# param.set_value(np.ones_like(param.get_value()))
print "... Building top active updates"
top_active = []
l_activation = l_x
for i in range(len(l_layers)):
l_activation = l_layers[i].output(l_activation)
print "... Building costs and errors"
l_cost = add_regularization(l_layers, l_layers[-1].cost(l_activation, y),
L1_reg, L2_reg)
l_error = l_layers[-1].error(l_activation, y)
print "... Building parameter updates"
l_grads = []
l_param_updates = []
for i in range(len(l_layers)):
for param in l_layers[i].params:
gparam = T.grad(l_cost, param)
l_grads.append(gparam)
l_param_updates.append((param, param - l_learning_rate * gparam))
print "... Compiling little net train function"
l_updates = l_param_updates
l_train_model = function(
[index], [l_cost, l_x, y],
updates=l_updates,
givens={
l_x: train_set_x[index * batch_size:(index + 1) * batch_size],
y: train_set_y[index * batch_size:(index + 1) * batch_size]
})
print "... Compiling little net test function"
l_test_model = function(
[index],
l_error,
givens={
l_x: test_set_x[index * batch_size:(index + 1) * batch_size],
y: test_set_y[index * batch_size:(index + 1) * batch_size]
})
print "... Compiling little net validate function"
l_validate_model = function(
[index],
l_error,
givens={
l_x: valid_set_x[index * batch_size:(index + 1) * batch_size],
y: valid_set_y[index * batch_size:(index + 1) * batch_size]
})
print "Training"
# early-stopping parameters
patience = 10000 # look as this many examples regardless
patience_increase = 10 # 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_params = None
this_validation_loss = 0
this_validation_loss_l = 0
this_validation_loss_b = 0
best_validation_loss = np.inf
best_validation_loss_l = best_validation_loss
best_validation_loss_b = best_validation_loss
best_iter = 0
test_score = 0.
test_score_l = 0.
accum_l = 0
epoch = 0
train_time_accum_l = 0
done_looping = False
timers = ['train', 'valid', 'train']
ts = TS(['epoch', 'valid'])
ts_l = TS(timers)
summarize_rates()
ts.start()
while (epoch < n_epochs) and (not done_looping):
epoch = epoch + 1
ts.start('epoch')
for minibatch_index in xrange(n_train_batches):
ts_l.start('train')
minibatch_avg_cost_l = l_train_model(minibatch_index)
ts_l.end('train')
minibatch_avg_cost_l = minibatch_avg_cost_l[0]
if np.isnan(minibatch_avg_cost_l):
print "minibatch_avg_cost_l: %f" % minibatch_avg_cost_l
ipdb.set_trace()
accum_l = accum_l + minibatch_avg_cost_l
# iteration number
iter = (epoch - 1) * n_train_batches + minibatch_index
if (iter + 1) % validation_frequency == 0:
ts.end('epoch')
ts.reset('epoch')
ts_l.reset('train')
accum_l = accum_l / validation_frequency
l_summary = ("minibatch_avg_cost_l: %f, time: %f" %
(accum_l, ts_l.accumed['train'][-1][1]))
accum_l = 0
train_time_accum_l = 0
print "%s" % (l_summary)
# compute zero-one loss on validation set
summary = ('epoch %i, minibatch %i/%i' %
(epoch, minibatch_index + 1, n_train_batches))
validation_losses_l = [
l_validate_model(i) for i in xrange(n_valid_batches)
]
this_validation_loss_l = np.mean(validation_losses_l)
l_summary = ('little validation error %f %% ' %
(this_validation_loss_l * 100.))
print("%s %s" % (summary, l_summary))
#ipdb.set_trace()
# if we got the best validation score until now
this_validation_loss = this_validation_loss_l
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)
best_validation_loss_l = this_validation_loss_l
best_validation_loss = best_validation_loss_l
best_iter = iter
# test it on the test set
test_losses_l = [
l_test_model(i) for i in xrange(n_test_batches)
]
test_score_l = np.mean(test_losses_l)
l_summary = 'little: %f' % (test_score_l * 100.)
print(
' epoch %i, minibatch %i/%i,'
' test error of best model %s' %
(epoch, minibatch_index + 1, n_train_batches,
l_summary))
learning_rate.update()
l_learning_rate.set_value(learning_rate.rate)
summarize_rates()
if patience <= iter:
done_looping = True
break
ts.end()
print(
'Optimization complete. Best validation score of %f %% '
'obtained at iteration %i, with test performance %f %%' %
(best_validation_loss_l * 100., best_iter + 1, test_score_l * 100.))
print >> sys.stderr, ('The code for file ' + os.path.split(__file__)[1] +
' ran for %s' % ts)
return ts.diffs['epoch']
def test_big_and_little_train_big(rng,
batch_size,
learning_rate,
momentum_rate,
n_epochs=1000,
L1_reg=0.0,
L2_reg=0.0001,
restore_parameters=False,
select_top_active=False,
mult_small_net_params=False,
zero_last_layer_params=False,
train_little_net=False,
train_big_net=True):
def summarize_rates():
print "Learning rate: ", learning_rate.rate, \
"Momentum: ", momentum.get_value()
assert (train_big_net or train_little_net)
l_learning_rate = shared(np.array(learning_rate.rate, dtype=config.floatX),
name='learning_rate')
b_learning_rate = shared(np.array(learning_rate.rate, dtype=config.floatX),
name='learning_rate')
momentum = shared(np.array(momentum_rate.rate, dtype=config.floatX),
name='momentum')
index = T.lscalar('index')
l_x = T.matrix('l_x', dtype=config.floatX)
b_x = T.tensor3('b_x', dtype=config.floatX)
y = T.ivector('y')
print "Loading Data"
print "... MNIST"
dataset = 'mnist.pkl.gz'
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]
n_train_batches = train_set_x.get_value(borrow=True).shape[0] / batch_size
n_valid_batches = valid_set_x.get_value(borrow=True).shape[0] / batch_size
n_test_batches = test_set_x.get_value(borrow=True).shape[0] / batch_size
print "Building models"
print "... Building layers"
# Create network structure
x_size = train_set_x.shape[1].eval()
y_size = train_set_y.shape[0].eval()
n_in = x_size
n_units_per = 1
n_out = 5000
l_layers = []
b_layers = []
l_params = None
# Shared variable used for always activating one block in a layer as in the
# input and output layer
one_block_idxs = shared(np.zeros((batch_size, 1), dtype='int64'),
name='one_block_idxs')
l_layers.append(
HiddenLayer(n_in,
n_out,
batch_size,
k=0.1,
activation=T.tanh,
name='l_layer_' + str(len(l_layers))))
if mult_small_net_params:
l_params = l_layers[-1].params
b_layers.append(
HiddenBlockLayer((1, x_size), (n_out, n_units_per),
one_block_idxs,
l_layers[-1].top_active,
batch_size,
activation=T.tanh,
name='b_layer_' + str(len(b_layers)),
l_params=l_params,
l_param_map=[('x', 1, 0, 'x'), (0, 'x')]))
n_in = n_out
l_layers.append(
HiddenLayer(n_in,
n_out,
batch_size,
k=0.1,
activation=T.tanh,
name='l_layer_' + str(len(l_layers))))
if mult_small_net_params:
l_params = l_layers[-1].params
b_layers.append(
HiddenBlockLayer(
(n_in, n_units_per),
(n_out, n_units_per),
l_layers[-2].top_active,
l_layers[-1].top_active,
#out_idxs_n,
batch_size,
activation=T.tanh,
name='b_layer_' + str(len(b_layers)),
l_params=l_params,
l_param_map=[(0, 1, 'x', 'x'), (0, 'x')]))
n_out = 10
l_layers.append(
HiddenLayer(n_in,
n_out,
batch_size,
k=1,
activation=T.nnet.softmax,
name='l_layer_' + str(len(l_layers))))
if zero_last_layer_params:
l_layers[-1].W.set_value(0 * l_layers[-1].W.get_value())
l_layers[-1].b.set_value(0 * l_layers[-1].b.get_value())
if mult_small_net_params:
l_params = l_layers[-1].params
b_layers.append(
HiddenBlockLayer((n_in, n_units_per), (1, n_out),
l_layers[-2].top_active,
one_block_idxs,
batch_size,
None,
name='b_layer_' + str(len(b_layers)),
l_params=l_params,
l_param_map=[(0, 'x', 'x', 1), ('x', 0)]))
if zero_last_layer_params:
b_layers[-1].W.set_value(0 * b_layers[-1].W.get_value())
b_layers[-1].b.set_value(0 * b_layers[-1].b.get_value())
if train_little_net or select_top_active:
for layer in l_layers:
print "\t%s" % layer
if train_big_net:
for layer in b_layers:
print layer
if restore_parameters:
print "... Restoring weights of little model"
restore_parameters('parameters_20_20_l1_0.0001_l2_0.0001.pkl',
l_layers)
#for l_layer in l_layers:
# for param in l_layer.params:
# param.set_value(np.ones_like(param.get_value()))
print "... Building top active updates"
top_active = []
l_activation = l_x
b_activation = b_x
b_activations = [b_activation]
for i in range(len(l_layers)):
l_activation = l_layers[i].output(l_activation)
b_activation = b_layers[i].output(b_activation)
b_activations.append(b_activation)
top_active.append((l_layers[i].top_active,
T.argsort(T.abs_(l_activation))[:, :l_layers[i].k]))
print "... Building costs and errors"
l_cost = add_regularization(l_layers, l_layers[-1].cost(l_activation, y),
L1_reg, L2_reg)
l_error = l_layers[-1].error(l_activation, y)
# T.nnet.softmax takes a matrix not a tensor so we only calculate the
# linear component at the last layer and here we reshape and then
# apply the softmax
#b_activation = T.nnet.softmax(((b_activation*b_activation)**2).sum(axis=2))
#b_activation = relu_softmax(((b_activation*b_activation)**2).sum(axis=2))
#b_activation = T.nnet.softmax(T.mean(b_activation, axis=2))
#b_activation = relu_softmax(T.mean(b_activation, axis=2))
#b_activation = T.nnet.softmax(T.max(b_activation, axis=2))
#b_activation = relu_softmax(T.max(b_activation, axis=2))
b_shp = b_activation.shape
#b_activation = relu_softmax(b_activation.reshape((b_shp[0], b_shp[2])))
b_activation = T.nnet.softmax(b_activation.reshape((b_shp[0], b_shp[2])))
b_activations.append(b_activation)
b_cost = add_regularization(b_layers, b_layers[-1].cost(b_activation, y),
L1_reg, L2_reg)
b_error = b_layers[-1].error(b_activation, y)
print "... Building parameter updates"
l_grads = []
l_param_updates = []
b_grads = []
b_param_updates = []
for i in range(len(l_layers)):
for param in l_layers[i].params:
gparam = T.grad(l_cost, param)
l_grads.append(gparam)
l_param_updates.append((param, param - l_learning_rate * gparam))
for param in b_layers[i].params:
b_gparam = T.grad(
b_cost,
param,
#consider_constant=[b_layers[i].in_idxs, b_layers[i].out_idxs]
)
b_velocity = shared(
np.zeros_like(param.get_value(), dtype=theano.config.floatX),
param.name + '_velocity')
b_param_updates.append(
(b_velocity,
momentum * b_velocity - b_learning_rate * b_gparam))
b_grads.append(b_gparam)
b_param_updates.append((param, param + b_velocity))
#if b_layers[i].l_params is not None:
#for param in b_layers[i].l_params:
#l_gparam = T.grad(
# b_cost,
# param
#)
#l_velocity = shared(
# np.zeros_like(param.get_value()),
# param.name + '_velocity'
#)
#b_param_updates.append((
# l_velocity, momentum*l_velocity - b_learning_rate*l_gparam
#))
#l_grads.append(l_gparam)
#b_param_updates.append((param, param + l_velocity))
#b_param_updates.append((
# param, param - 0.0001*l_gparam
#))
print "... Compiling little net train function"
l_updates = []
if select_top_active:
l_updates = l_updates + top_active
if train_little_net:
l_updates = l_updates + l_param_updates
l_train_model = function(
[index], [l_cost, l_x, y],
updates=l_updates,
givens={
l_x: train_set_x[index * batch_size:(index + 1) * batch_size],
y: train_set_y[index * batch_size:(index + 1) * batch_size]
})
print "... Compiling big net train function"
temp = train_set_x.get_value(borrow=True, return_internal_type=True)
train_set_x_b = shared(temp.reshape((temp.shape[0], 1, temp.shape[1])),
borrow=True,
name='train_set_x_b')
b_updates = []
if train_big_net:
b_updates = b_updates + b_param_updates
b_train_model = function(
[index], [b_cost],
updates=b_updates,
givens={
b_x: train_set_x_b[index * batch_size:(index + 1) * batch_size],
y: train_set_y[index * batch_size:(index + 1) * batch_size]
})
#theano.printing.debugprint(b_train_model)
#ipdb.set_trace()
# verify_layers(batch_size, b_layers, train_set_x_b, train_set_y)
# temp = verify_cost(
# b_cost,
# b_layers,
# b_x,
# y,
# batch_size,
# train_set_x_b,
# train_set_y
# )
# T.verify_grad(
# temp,
# [b_layers[0].W.get_value(), b_layers[1].W.get_value()],
# rng=rng
# )
print "... Compiling little net test function"
l_test_model = function(
[index],
l_error,
givens={
l_x: test_set_x[index * batch_size:(index + 1) * batch_size],
y: test_set_y[index * batch_size:(index + 1) * batch_size]
})
print "... Compiling big net test function"
temp = test_set_x.get_value(borrow=True, return_internal_type=True)
test_set_x_b = shared(temp.reshape((temp.shape[0], 1, temp.shape[1])),
borrow=True,
name='test_set_x_b')
b_test_model = function(
[index],
b_error,
givens={
b_x: test_set_x_b[index * batch_size:(index + 1) * batch_size],
y: test_set_y[index * batch_size:(index + 1) * batch_size]
})
print "... Compiling little net validate function"
l_validate_model = function(
[index],
l_error,
givens={
l_x: valid_set_x[index * batch_size:(index + 1) * batch_size],
y: valid_set_y[index * batch_size:(index + 1) * batch_size]
})
print "... Compiling big net validate function"
temp = valid_set_x.get_value(borrow=True, return_internal_type=True)
valid_set_x_b = shared(temp.reshape((temp.shape[0], 1, temp.shape[1])),
borrow=True,
name='valid_set_x_b')
b_validate_model = function(
[index],
b_error,
givens={
b_x: valid_set_x_b[index * batch_size:(index + 1) * batch_size],
y: valid_set_y[index * batch_size:(index + 1) * batch_size]
})
print "Training"
# early-stopping parameters
patience = 10000 # look as this many examples regardless
patience_increase = 10 # 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_params = None
this_validation_loss = 0
this_validation_loss_l = 0
this_validation_loss_b = 0
best_validation_loss = np.inf
best_validation_loss_l = best_validation_loss
best_validation_loss_b = best_validation_loss
best_iter = 0
test_score = 0.
test_score_l = 0.
test_score_b = 0.
accum_l = 0
accum_b = 0
epoch = 0
train_time_accum_l = 0
train_time_accum_b = 0
done_looping = False
timers = ['train', 'valid', 'train']
ts = TS(['epoch', 'valid'])
ts_l = TS(timers)
ts_b = TS(timers)
summarize_rates()
ts.start()
while (epoch < n_epochs) and (not done_looping):
epoch = epoch + 1
ts.start('epoch')
for minibatch_index in xrange(n_train_batches):
if train_little_net or select_top_active:
ts_l.start('train')
minibatch_avg_cost_l = l_train_model(minibatch_index)
ts_l.end('train')
minibatch_avg_cost_l = minibatch_avg_cost_l[0]
if np.isnan(minibatch_avg_cost_l):
print "minibatch_avg_cost_l: %f" % minibatch_avg_cost_l
ipdb.set_trace()
accum_l = accum_l + minibatch_avg_cost_l
if train_big_net:
ts_b.start('train')
minibatch_avg_cost_b = b_train_model(minibatch_index)
ts_b.end('train')
minibatch_avg_cost_b = minibatch_avg_cost_b[0]
accum_b = accum_b + minibatch_avg_cost_b
#print "minibatch_avg_cost: " + str(minibatch_avg_cost) + " minibatch_avg_cost_b: " + str(minibatch_avg_cost_b)
#print l_layers[0].W.get_value().sum(), l_layers[1].W.get_value().sum(), b_layers[0].W.get_value().sum(), b_layers[1].W.get_value().sum()
#print "A: ", np.max(np.abs(b_layers[0].W.get_value())), np.max(np.abs(b_layers[0].b.get_value())), np.max(np.abs(b_layers[1].W.get_value())), np.max(np.abs(b_layers[1].b.get_value()))
#print "B: ", np.abs(b_layers[0].W.get_value()).sum(), np.abs(b_layers[0].b.get_value()).sum(), np.abs(b_layers[1].W.get_value()).sum(), np.abs(b_layers[1].b.get_value()).sum()
#print "C: ", np.abs(np.array(minibatch_avg_cost_b[1])).sum(), np.abs(np.array(minibatch_avg_cost_b[2])).sum(), np.abs(np.array(minibatch_avg_cost_b[3])).sum(), np.abs(np.array(minibatch_avg_cost_b[4])).sum()
# iteration number
iter = (epoch - 1) * n_train_batches + minibatch_index
if (iter + 1) % validation_frequency == 0:
ts.end('epoch')
ts.reset('epoch')
l_summary = ""
if train_little_net or select_top_active:
ts_l.reset('train')
accum_l = accum_l / validation_frequency
l_summary = ("minibatch_avg_cost_l: %f, time: %f" %
(accum_l, ts_l.accumed['train'][-1][1]))
accum_l = 0
train_time_accum_l = 0
b_summary = ""
if train_big_net:
ts_b.reset('train')
accum_b = accum_b / validation_frequency
b_summary = ("minibatch_avg_cost_b: %f, time: %f" %
(accum_b, ts_b.accumed['train'][-1][1]))
accum_b = 0
print "%s %s" % (l_summary, b_summary)
# compute zero-one loss on validation set
summary = ('epoch %i, minibatch %i/%i' %
(epoch, minibatch_index + 1, n_train_batches))
l_summary = ""
if train_little_net or select_top_active:
validation_losses_l = [
l_validate_model(i) for i in xrange(n_valid_batches)
]
this_validation_loss_l = np.mean(validation_losses_l)
l_summary = ('little validation error %f %% ' %
(this_validation_loss_l * 100.))
b_summary = ""
if train_big_net:
validation_losses_b = [
b_validate_model(i) for i in xrange(n_valid_batches)
]
this_validation_loss_b = np.mean(validation_losses_b)
#this_validation_loss_b = 0
b_summary = ('big validation error %f %% ' %
(this_validation_loss_b * 100.))
print("%s %s %s" % (summary, l_summary, b_summary))
#ipdb.set_trace()
# if we got the best validation score until now
if train_big_net:
this_validation_loss = this_validation_loss_b
elif train_little_net:
this_validation_loss = this_validation_loss_l
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)
best_validation_loss_l = this_validation_loss_l
best_validation_loss_b = this_validation_loss_b
if train_big_net:
best_validation_loss = best_validation_loss_b
elif train_little_net:
best_validation_loss = best_validation_loss_l
best_iter = iter
# test it on the test set
l_summary = ""
if train_little_net:
test_losses_l = [
l_test_model(i) for i in xrange(n_test_batches)
]
test_score_l = np.mean(test_losses_l)
l_summary = 'little: %f' % (test_score_l * 100.)
b_summary = ""
if train_big_net:
test_losses_b = [
b_test_model(i) for i in xrange(n_test_batches)
]
test_score_b = np.mean(test_losses_b)
#test_score_b = 0
b_summary = 'big: %f' % (test_score_b * 100.)
print(
' epoch %i, minibatch %i/%i,'
' test error of best model %s %s' %
(epoch, minibatch_index + 1, n_train_batches,
l_summary, b_summary))
learning_rate.update()
if train_little_net:
l_learning_rate.set_value(learning_rate.rate)
if train_big_net:
b_learning_rate.set_value(learning_rate.rate)
momentum_rate.update()
momentum.set_value(momentum_rate.rate)
summarize_rates()
if patience <= iter:
done_looping = True
break
ts.end()
print(
'Optimization complete. Best validation score of %f %% (%f %%) '
'obtained at iteration %i, with test performance %f %% (%f %%)' %
(best_validation_loss_l * 100., best_validation_loss_b * 100.,
best_iter + 1, test_score_l * 100., test_score_b * 100.))
print >> sys.stderr, ('The code for file ' + os.path.split(__file__)[1] +
' ran for %s' % ts)
def test_big_and_little_train_both(rng,
batch_size=1,
learning_rate=0.01,
n_epochs=1000,
L1_reg=0.0,
L2_reg=0.0001):
l_learning_rate = learning_rate
b_learning_rate = 10 * learning_rate
index = T.lscalar('index')
l_x = T.matrix('l_x', dtype=config.floatX)
b_x = T.tensor3('b_x', dtype=config.floatX)
y = T.ivector('y')
print "Loading Data"
dataset = 'mnist.pkl.gz'
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]
n_train_batches = train_set_x.get_value(borrow=True).shape[0] / batch_size
n_valid_batches = valid_set_x.get_value(borrow=True).shape[0] / batch_size
n_test_batches = test_set_x.get_value(borrow=True).shape[0] / batch_size
print "Building models"
print "... Building layers"
# Create network structure
x_size = train_set_x.shape[1].eval()
n_in = x_size
n_units_per = 32
n_out = 500
l_layers = []
b_layers = []
l_layers.append(
HiddenLayer(
n_in,
n_out,
batch_size,
#k=0.05,
k=1,
activation=T.tanh,
name='l_layer_' + str(len(l_layers))))
in_idxs_0 = shared(np.zeros((batch_size, 1), dtype='int64'),
name='in_idxs_0')
b_layers.append(
HiddenBlockLayer((1, x_size), (n_out, n_units_per),
in_idxs_0,
l_layers[-1].top_active,
batch_size,
activation=T.tanh,
name='b_layer_' + str(len(b_layers))))
#n_in = n_out
#n_out = 100
#k_activations = 0.12
#l_layers.append(
# HiddenLayer(
# n_in,
# n_out,
# k=k_activations,
# name='l_layer_' + str(len(l_layers))
# )
#)
#b_layers.append(HiddenBlockLayer(n_in, n_out, batch_size))
n_in = n_out
n_out = 10
l_layers.append(
HiddenLayer(n_in,
n_out,
batch_size,
k=1,
activation=T.nnet.softmax,
name='l_layer_' + str(len(l_layers))))
l_layers[-1].W.set_value(0 * l_layers[-1].W.get_value())
# T.nnet.softmax takes a matrix not a tensor so just calculate the linear
# component in the layer and apply the softmax later
#out_idxs_n = shared(
# np.repeat(
# np.arange(n_out, dtype='int64').reshape(1, n_out),
# batch_size,
# axis=0
# ),
# name='out_idxs_' + str(len(l_layers))
#)
b_layers.append(
HiddenBlockLayer(
(n_in, n_units_per),
(n_out, n_units_per),
l_layers[-2].top_active,
l_layers[-1].top_active,
#out_idxs_n,
batch_size,
None,
name='b_layer_' + str(len(b_layers))))
#b_layers[-1].W.set_value(0*b_layers[-1].W.get_value())
print "... Building top active updates"
top_active = []
l_activation = l_x
b_activation = b_x
b_activations = [b_activation]
for i in range(len(l_layers)):
l_activation = l_layers[i].output(l_activation)
b_activation = b_layers[i].output(b_activation)
b_activations.append(b_activation)
top_active.append((l_layers[i].top_active,
T.argsort(T.abs_(l_activation))[:, :l_layers[i].k]))
print "... Building costs and errors"
l_cost = add_regularization(l_layers, l_layers[-1].cost(l_activation, y),
L1_reg, L2_reg)
l_error = l_layers[-1].error(l_activation, y)
# T.nnet.softmax takes a matrix not a tensor so we only calculate the
# linear component at the last layer and here we reshape and then
# apply the softmax
#b_activation = T.nnet.softmax(((b_activation*b_activation)**2).sum(axis=2))
#b_activation = relu_softmax(((b_activation*b_activation)**2).sum(axis=2))
b_activation = T.nnet.softmax(T.mean(b_activation, axis=2))
#b_activation = relu_softmax(T.mean(b_activation, axis=2))
#b_activation = T.nnet.softmax(T.max(b_activation, axis=2))
#b_activation = relu_softmax(T.max(b_activation, axis=2))
b_activations.append(b_activation)
b_cost = add_regularization(b_layers, b_layers[-1].cost(b_activation, y),
L1_reg, L2_reg)
b_error = b_layers[-1].error(b_activation, y)
print "... Building parameter updates"
l_grads = []
l_param_updates = []
b_grads = []
b_param_updates = []
for i in range(len(l_layers)):
for param in l_layers[i].params:
gparam = T.grad(l_cost, param)
l_grads.append(gparam)
l_param_updates.append((param, param - l_learning_rate * gparam))
for param in b_layers[i].params:
gparam = T.grad(
b_cost,
param,
consider_constant=[b_layers[i].in_idxs, b_layers[i].out_idxs])
b_grads.append(gparam)
b_param_updates.append((param, param - b_learning_rate * gparam))
print "... Compiling little net train function"
l_train_model = function(
[index], [l_cost, l_x, y],
updates=top_active + l_param_updates,
givens={
l_x: train_set_x[index * batch_size:(index + 1) * batch_size],
y: train_set_y[index * batch_size:(index + 1) * batch_size]
})
print "... Compiling big net train function"
temp = train_set_x.get_value(borrow=True, return_internal_type=True)
train_set_x_b = shared(temp.reshape((temp.shape[0], 1, temp.shape[1])),
borrow=True,
name='train_set_x_b')
b_train_model = function(
[index], [b_cost],
updates=b_param_updates,
givens={
b_x: train_set_x_b[index * batch_size:(index + 1) * batch_size],
y: train_set_y[index * batch_size:(index + 1) * batch_size]
})
#theano.printing.debugprint(b_train_model)
#ipdb.set_trace()
# verify_layers(batch_size, b_layers, train_set_x_b, train_set_y)
# temp = verify_cost(
# b_cost,
# b_layers,
# b_x,
# y,
# batch_size,
# train_set_x_b,
# train_set_y
# )
# T.verify_grad(
# temp,
# [b_layers[0].W.get_value(), b_layers[1].W.get_value()],
# rng=rng
# )
print "... Compiling little net test function"
l_test_model = function(
[index],
l_error,
givens={
l_x: test_set_x[index * batch_size:(index + 1) * batch_size],
y: test_set_y[index * batch_size:(index + 1) * batch_size]
})
print "... Compiling big net test function"
temp = test_set_x.get_value(borrow=True, return_internal_type=True)
test_set_x_b = shared(temp.reshape((temp.shape[0], 1, temp.shape[1])),
borrow=True,
name='test_set_x_b')
b_test_model = function(
[index],
b_error,
givens={
b_x: test_set_x_b[index * batch_size:(index + 1) * batch_size],
y: test_set_y[index * batch_size:(index + 1) * batch_size]
})
print "... Compiling little net validate function"
l_validate_model = function(
[index],
l_error,
givens={
l_x: valid_set_x[index * batch_size:(index + 1) * batch_size],
y: valid_set_y[index * batch_size:(index + 1) * batch_size]
})
print "... Compiling big net validate function"
temp = valid_set_x.get_value(borrow=True, return_internal_type=True)
valid_set_x_b = shared(temp.reshape((temp.shape[0], 1, temp.shape[1])),
borrow=True,
name='valid_set_x_b')
b_validate_model = function(
[index],
b_error,
givens={
b_x: valid_set_x_b[index * batch_size:(index + 1) * batch_size],
y: valid_set_y[index * batch_size:(index + 1) * batch_size]
})
print "Training"
# early-stopping parameters
patience = 10000 # look as this many examples regardless
patience_increase = 100 # 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_params = None
best_validation_loss = np.inf
best_iter = 0
test_score = 0.
start_time = time.clock()
epoch = 0
done_looping = False
accum = 0
accum_b = 0
while (epoch < n_epochs) and (not done_looping):
epoch = epoch + 1
for minibatch_index in xrange(n_train_batches):
minibatch_avg_cost = l_train_model(minibatch_index)
minibatch_avg_cost_b = b_train_model(minibatch_index,
learning_rate.rate)
#print "minibatch_avg_cost: " + str(minibatch_avg_cost) + " minibatch_avg_cost_b: " + str(minibatch_avg_cost_b)
#print l_layers[0].W.get_value().sum(), l_layers[1].W.get_value().sum(), b_layers[0].W.get_value().sum(), b_layers[1].W.get_value().sum()
#print "A: ", np.max(np.abs(b_layers[0].W.get_value())), np.max(np.abs(b_layers[0].b.get_value())), np.max(np.abs(b_layers[1].W.get_value())), np.max(np.abs(b_layers[1].b.get_value()))
#print "B: ", np.abs(b_layers[0].W.get_value()).sum(), np.abs(b_layers[0].b.get_value()).sum(), np.abs(b_layers[1].W.get_value()).sum(), np.abs(b_layers[1].b.get_value()).sum()
#print "C: ", np.abs(np.array(minibatch_avg_cost_b[1])).sum(), np.abs(np.array(minibatch_avg_cost_b[2])).sum(), np.abs(np.array(minibatch_avg_cost_b[3])).sum(), np.abs(np.array(minibatch_avg_cost_b[4])).sum()
minibatch_avg_cost = minibatch_avg_cost[0]
minibatch_avg_cost_b = minibatch_avg_cost_b[0]
accum = accum + minibatch_avg_cost
accum_b = accum_b + minibatch_avg_cost_b
# iteration number
iter = (epoch - 1) * n_train_batches + minibatch_index
if (iter + 1) % validation_frequency == 0:
accum = accum / validation_frequency
accum_b = accum_b / validation_frequency
print "minibatch_avg_cost: ", accum, \
"minibatch_avg_cost_b: ", accum_b
accum = 0
accum_b = 0
# compute zero-one loss on validation set
validation_losses = [
l_validate_model(i) for i in xrange(n_valid_batches)
]
this_validation_loss = np.mean(validation_losses)
validation_losses_b = [
b_validate_model(i) for i in xrange(n_valid_batches)
]
this_validation_loss_b = np.mean(validation_losses_b)
#this_validation_loss_b = 0
print(
'epoch %i, minibatch %i/%i, validation error %f %% '
'(%f %%)' % (epoch, minibatch_index + 1, n_train_batches,
this_validation_loss * 100.,
this_validation_loss_b * 100.))
#ipdb.set_trace()
# 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)
best_validation_loss = this_validation_loss
best_iter = iter
# test it on the test set
test_losses = [
l_test_model(i) for i in xrange(n_test_batches)
]
test_score = np.mean(test_losses)
test_losses_b = [
b_test_model(i) for i in xrange(n_test_batches)
]
test_score_b = np.mean(test_losses_b)
#test_score_b = 0
print((' epoch %i, minibatch %i/%i, test error of '
'best model %f %% (%f %%)') %
(epoch, minibatch_index + 1, n_train_batches,
test_score * 100., test_score_b * 100.))
if patience <= iter:
done_looping = True
break
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_score * 100.))
print >> sys.stderr, ('The code for file ' + os.path.split(__file__)[1] +
' ran for %.2fm' % ((end_time - start_time) / 60.))
def setup_hidden_layers(self, activation, n_in=0, n_out=0, n_hiddens=0):
"""
Setup the hidden layers with the specified number of hidden units.
"""
act_fn = T.tanh
if activation == NeuralActivations.Rectifier:
act_fn = self.rectifier_act
if n_in == 0:
n_in = self.n_in
if n_out == 0:
n_out = self.n_out
if n_hiddens == 0:
n_hiddens = self.n_hiddens
self.rng.seed(1985)
#Create the hidden layers.
self.hiddenLayers.append(
HiddenLayer(rng=self.rng,
input=self.input,
n_in=n_in,
n_out=n_hiddens[0],
activation=act_fn))
for i in xrange(1, self.n_hidden_layers):
self.rng.seed(2012)
self.hiddenLayers.append(
HiddenLayer(rng=self.rng,
input=self.hiddenLayers[i - 1].output,
n_in=n_hiddens[i - 1],
n_out=n_hiddens[i],
activation=act_fn))
# The logistic regression layer gets as input the hidden units
# of the hidden layer
self.logRegressionLayer = LogisticRegressionLayer(
input=self.hiddenLayers[-1].output,
n_in=n_hiddens[-1],
n_out=n_out,
rng=self.rng)
self.initialize_regularization()
# negative log likelihood of the MLP is given by the negative
# log likelihood of the output of the model, computed in the
# logistic regression layer
self.negative_log_likelihood = self.logRegressionLayer.negative_log_likelihood
# negative log likelihood of the MLP is given by the
# crossentropy of the output of the model, computed in the
# logistic regression layer
self.crossentropy = self.logRegressionLayer.crossentropy
self.crossentropy_categorical = self.logRegressionLayer.crossentropy_categorical
# same holds for the function computing the number of errors
self.errors = self.logRegressionLayer.errors
self.raw_prediction_errors =\
self.logRegressionLayer.raw_prediction_errors
self.p_y_given_x = self.logRegressionLayer.p_y_given_x
# Class memberships
hidden_outputs = self.hiddenLayers[0].get_outputs(self.input)
for i in xrange(1, self.n_hidden_layers):
hidden_outputs = self.hiddenLayers[i].get_outputs(hidden_outputs)
self.class_memberships = self.logRegressionLayer.get_class_memberships(
hidden_outputs)
self.initialize_params()
