def linearLSTM_over_TreeLstm(self, num_classes, sent_lstm_num_units):
self.sent_cell = td.ScopedLayer(tf.contrib.rnn.BasicLSTMCell(
num_units=sent_lstm_num_units), name_or_scope = self._sent_lstm_default_scope_name)
sent_lstm = (td.Map(self.tree_lstm.tree_lstm()
>> td.Concat()) >> td.RNN(self.sent_cell))
self.output_layer = td.FC(
num_classes, activation=None, name=self._output_layer_default_scope_name)
return (td.Scalar('int32'), sent_lstm >> td.GetItem(1)
>> td.GetItem(0) >> self.output_layer) \
>> self.set_metrics()
def __init__(self, weight_matrix, word_idx, ModelConfig):
self.ModelConfig = ModelConfig
self.word_embedding = td.Embedding(*weight_matrix.shape,
initializer=weight_matrix,
name='word_embedding')
self.word_idx = word_idx
self.keep_prob_ph = tf.placeholder_with_default(1.0, [])
self.tree_lstm = td.ScopedLayer(tf.contrib.rnn.DropoutWrapper(
BinaryTreeLSTMCell(self.ModelConfig.lstm_num_units,
keep_prob=self.keep_prob_ph),
input_keep_prob=self.keep_prob_ph,
output_keep_prob=self.keep_prob_ph),
name_or_scope='tree_lstm')
self.output_layer = td.FC(self.ModelConfig.num_classes,
activation=None,
name='output_layer')
self.embed_subtree = td.ForwardDeclaration(name='embed_subtree')
self.model = self.embed_tree(is_root=True)
self.embed_subtree.resolve_to(self.embed_tree(is_root=False))
self.compiler = td.Compiler.create(self.model)
print('input type: %s' % self.model.input_type)
print('output type: %s' % self.model.output_type)
self.metrics = {
k: tf.reduce_mean(v)
for k, v in self.compiler.metric_tensors.items()
}
self.loss = tf.reduce_sum(self.compiler.metric_tensors['all_loss'])
opt = tf.train.AdagradOptimizer(ModelConfig.learning_rate)
grads_and_vars = opt.compute_gradients(self.loss)
found = 0
for i, (grad, var) in enumerate(grads_and_vars):
if var == self.word_embedding.weights:
found += 1
grad = tf.scalar_mul(ModelConfig.embedding_learning_rate, grad)
grads_and_vars[i] = (grad, var)
assert found == 1 # internal consistency check
self.train_op = opt.apply_gradients(grads_and_vars)
self.saver = tf.train.Saver()
self.sess = tf.Session()
self.sess.run(tf.global_variables_initializer())
def build_program_decoder_for_analysis(token_emb_size, rnn_cell):
"""
Does the same as build_program_decoder_for_analysis, but also returns
the final hidden state of the decoder
"""
decoder_rnn = td.ScopedLayer(rnn_cell, 'decoder')
decoder_rnn_output = td.RNN(decoder_rnn,
initial_state_from_input=True) >> td.GetItem(0)
fc_layer = td.FC(token_emb_size,
activation=tf.nn.relu,
initializer=tf.contrib.layers.xavier_initializer(),
name='encoder_fc')
# decoder_rnn_output.reads()
un_normalised_token_probs = td.Map(fc_layer)
return decoder_rnn_output >> td.AllOf(un_normalised_token_probs,
td.Identity())
def build_program_decoder(token_emb_size, rnn_cell, just_tokens=False):
"""
Used for blind or 'look-behind' decoders
"""
decoder_rnn = td.ScopedLayer(rnn_cell, 'decoder')
decoder_rnn_output = td.RNN(decoder_rnn,
initial_state_from_input=True) >> td.GetItem(0)
fc_layer = td.FC(
token_emb_size,
activation=tf.nn.relu,
initializer=tf.contrib.layers.xavier_initializer(),
name='encoder_fc' # this is fantastic
)
# un_normalised_token_probs = decoder_rnn_output >> td.Map(fc_layer)
if just_tokens:
return decoder_rnn_output >> td.Map(fc_layer)
else:
return decoder_rnn_output >> td.AllOf(td.Map(fc_layer), td.Identity())
def bidirectional_dynamic_FC(fw_cell, bw_cell, hidden):
bidir_conv_lstm = td.Composition()
with bidir_conv_lstm.scope():
fw_seq = td.Identity().reads(bidir_conv_lstm.input[0])
labels = (
td.GetItem(1) >> td.Map(td.Metric("labels")) >> td.Void()).reads(
bidir_conv_lstm.input)
bw_seq = td.Slice(step=-1).reads(fw_seq)
forward_dir = (td.RNN(fw_cell) >> td.GetItem(0)).reads(fw_seq)
back_dir = (td.RNN(bw_cell) >> td.GetItem(0)).reads(bw_seq)
back_to_leftright = td.Slice(step=-1).reads(back_dir)
output_transform = td.FC(1, activation=None)
bidir_common = (td.ZipWith(
td.Concat() >> output_transform >> td.Metric('logits'))).reads(
forward_dir, back_to_leftright)
bidir_conv_lstm.output.reads(bidir_common)
return bidir_conv_lstm
def _compile(self):
with self.sess.as_default():
import tensorflow_fold as td
output_size = len(self.labels)
self.keep_prob = tf.placeholder_with_default(tf.constant(1.0),shape=None)
char_emb = td.Embedding(num_buckets=self.char_buckets,
num_units_out=self.embedding_size)
#initializer=tf.truncated_normal_initializer(stddev=0.15))
char_cell = td.ScopedLayer(tf.contrib.rnn.LSTMCell(num_units=self.rnn_dim), 'char_cell')
char_lstm = (td.InputTransform(lambda s: [ord(c) for c in s])
>> td.Map(td.Scalar('int32') >> char_emb)
>> td.RNN(char_cell) >> td.GetItem(1) >> td.GetItem(1))
rnn_fwdcell = td.ScopedLayer(tf.contrib.rnn.LSTMCell(num_units=self.rnn_dim), 'lstm_fwd')
fwdlayer = td.RNN(rnn_fwdcell) >> td.GetItem(0)
rnn_bwdcell = td.ScopedLayer(tf.contrib.rnn.LSTMCell(num_units=self.rnn_dim), 'lstm_bwd')
bwdlayer = (td.Slice(step=-1) >> td.RNN(rnn_bwdcell)
>> td.GetItem(0) >> td.Slice(step=-1))
pos_emb = td.Embedding(num_buckets=300,
num_units_out=32,
initializer=tf.truncated_normal_initializer(stddev=0.1))
pos_x = (td.InputTransform(lambda x: x + 150)
>> td.Scalar(dtype='int32')
>> pos_emb)
pos_y = (td.InputTransform(lambda x: x + 150)
>> td.Scalar(dtype='int32')
>> pos_emb)
input_layer = td.Map(td.Record((char_lstm,pos_x,pos_y)) >> td.Concat())
maxlayer = (td.AllOf(fwdlayer, bwdlayer)
>> td.ZipWith(td.Concat())
>> td.Max())
output_layer = (input_layer >>
maxlayer >> td.FC(output_size,
input_keep_prob=self.keep_prob,
activation=None))
self.compiler = td.Compiler.create((output_layer,
td.Vector(output_size,dtype=tf.int32)))
self.y_out, self.y_true = self.compiler.output_tensors
self.y_loss = tf.reduce_mean(
tf.nn.softmax_cross_entropy_with_logits(
logits=self.y_out,labels=self.y_true))
self.y_prob = tf.nn.softmax(self.y_out)
self.y_true_idx = tf.argmax(self.y_true,axis=1)
self.y_pred_idx = tf.argmax(self.y_prob,axis=1)
self.y_pred = tf.one_hot(self.y_pred_idx,depth=output_size,dtype=tf.int32)
epoch_step = tf.Variable(0, trainable=False)
self.epoch_step_op = tf.assign(epoch_step, epoch_step+1)
lrate_decay = tf.train.exponential_decay(self.lrate, epoch_step, 1, self.decay)
if self.optimizer == 'adam':
self.opt = tf.train.AdamOptimizer(learning_rate=lrate_decay)
elif self.optimizer == 'adagrad':
self.opt = tf.train.AdagradOptimizer(learning_rate=lrate_decay,
initial_accumulator_value=1e-08)
elif self.optimizer == 'rmsprop' or self.optimizer == 'default':
self.opt = tf.train.RMSPropOptimizer(learning_rate=lrate_decay,
epsilon=1e-08)
else:
raise Exception(('The optimizer {} is not in list of available '
+ 'optimizers: default, adam, adagrad, rmsprop.')
.format(self.optimizer))
# apply learning multiplier on on embedding learning rate
embeds = [pos_emb.weights, char_emb.weights]
grads_and_vars = self.opt.compute_gradients(self.y_loss)
found = 0
for i, (grad, var) in enumerate(grads_and_vars):
if var in embeds:
found += 1
grad = tf.scalar_mul(self.embedding_factor, grad)
grads_and_vars[i] = (grad, var)
assert found == len(embeds) # internal consistency check
self.train_step = self.opt.apply_gradients(grads_and_vars)
self.sess.run(tf.global_variables_initializer())
self.saver = tf.train.Saver(max_to_keep=100)
new_h = tf.tanh(new_c) * tf.sigmoid(og)
resultH = tf.concat([new_h], 1)
resultH = tf.nn.dropout(resultH, self._keep_prob)
return resultH, [new_c, new_h]
# dropout keep probability, with a default of 1 (for eval).
keep_prob_ph = tf.placeholder_with_default(1.0, [])
lstm_num_units = 256 # Tai et al. used 150
tree_lstm = td.ScopedLayer(binaryTreeLSTMCell(lstm_num_units,
keep_prob=keep_prob_ph),
name_or_scope='tree_lstm')
NUM_CLASSES = 6 # number of distinct labels
output_layer = td.FC(NUM_CLASSES, activation=None, name='output_layer')
word_embedding = td.Embedding(*weight_matrix.shape,
initializer=weight_matrix,
name='word_embedding',
trainable=False)
# declare recursive model
embed_subtree = td.ForwardDeclaration(name='embed_subtree')
def makeContextMat(input1):
input1 = int(input1)
if input1 == 0:
# if input1 < 2:
return [1 for i in range(10)]
def run(write_to, batch_size_setting):
startTime = time.time()
data_dir = "../senti/"
"""
def download_and_unzip(url_base, zip_name, *file_names):
zip_path = os.path.join(data_dir, zip_name)
url = url_base + zip_name
print('downloading %s to %s' % (url, zip_path))
urllib.request.urlretrieve(url, zip_path)
out_paths = []
with zipfile.ZipFile(zip_path, 'r') as f:
for file_name in file_names:
print('extracting %s' % file_name)
out_paths.append(f.extract(file_name, path=data_dir))
return out_paths
def download(url_base, zip_name):
zip_path = os.path.join(data_dir, zip_name)
url = url_base + zip_name
print('downloading %s to %s' % (url, zip_path))
urllib.request.urlretrieve(url, zip_path)
full_glove_path, = download_and_unzip(
'http://nlp.stanford.edu/data/', 'glove.840B.300d.zip',
'glove.840B.300d.txt')
train_path, dev_path, test_path = download_and_unzip(
'http://nlp.stanford.edu/sentiment/', 'trainDevTestTrees_PTB.zip',
'trees/train.txt', 'trees/dev.txt', 'trees/test.txt')
filtered_glove_path = os.path.join(data_dir, 'filtered_glove.txt')
def filter_glove():
vocab = set()
# Download the full set of unlabeled sentences separated by '|'.
sentence_path, = download_and_unzip(
'http://nlp.stanford.edu/~socherr/', 'stanfordSentimentTreebank.zip',
'stanfordSentimentTreebank/SOStr.txt')
with codecs.open(sentence_path, encoding='utf-8') as f:
for line in f:
# Drop the trailing newline and strip backslashes. Split into words.
vocab.update(line.strip().replace('\\', '').split('|'))
nread = 0
nwrote = 0
with codecs.open(full_glove_path, encoding='utf-8') as f:
with codecs.open(filtered_glove_path, 'w', encoding='utf-8') as out:
for line in f:
nread += 1
line = line.strip()
if not line: continue
if line.split(u' ', 1)[0] in vocab:
out.write(line + '\n')
nwrote += 1
print('read %s lines, wrote %s' % (nread, nwrote))
#filter_glove()
"""
dev_glove_path = os.path.join('./', 'small_glove.txt')
def load_embeddings(embedding_path):
"""Loads embedings, returns weight matrix and dict from words to indices."""
print('loading word embeddings from %s' % embedding_path)
weight_vectors = []
word_idx = {}
with codecs.open(embedding_path, encoding='utf-8') as f:
for line in f:
word, vec = line.split(u' ', 1)
word_idx[word] = len(weight_vectors)
weight_vectors.append(np.array(vec.split(), dtype=np.float32))
# Annoying implementation detail; '(' and ')' are replaced by '-LRB-' and
# '-RRB-' respectively in the parse-trees.
#word_idx[u'-LRB-'] = word_idx.pop(u'(')
#word_idx[u'-RRB-'] = word_idx.pop(u')')
# Random embedding vector for unknown words.
weight_vectors.append(
np.random.uniform(-0.05, 0.05,
weight_vectors[0].shape).astype(np.float32))
return np.stack(weight_vectors), word_idx
weight_matrix, word_idx = load_embeddings(dev_glove_path)
def load_trees(filename):
with codecs.open(filename, encoding='utf-8') as f:
# Drop the trailing newline and strip \s.
trees = [line.strip().replace('\\', '') for line in f]
print('loaded %s trees from %s' % (len(trees), filename))
return trees
#train_path = './senti/trees/train.txt'
#train_path = os.path.join(data_dir, 'trees/dev.txt')
train_path = './dev.txt'
#dev_path = './senti/trees/dev.txt'
#test_path = './senti/trees/test.txt'
train_trees = load_trees(train_path)
trainSIZE = len(train_trees)
#dev_trees = load_trees(dev_path)
#test_trees = load_trees(test_path)
class BinaryTreeLSTMCell(tf.contrib.rnn.BasicLSTMCell):
"""LSTM with two state inputs.
This is the model described in section 3.2 of 'Improved Semantic
Representations From Tree-Structured Long Short-Term Memory
Networks' <http://arxiv.org/pdf/1503.00075.pdf>, with recurrent
dropout as described in 'Recurrent Dropout without Memory Loss'
<http://arxiv.org/pdf/1603.05118.pdf>.
"""
def __init__(self, num_units, keep_prob=1.0):
"""Initialize the cell.
Args:
num_units: int, The number of units in the LSTM cell.
keep_prob: Keep probability for recurrent dropout.
"""
super(BinaryTreeLSTMCell, self).__init__(num_units)
self._keep_prob = keep_prob
def __call__(self, inputs, state, scope=None):
with tf.variable_scope(scope or type(self).__name__):
lhs, rhs = state
c0, h0 = lhs
c1, h1 = rhs
concat = tf.contrib.layers.linear(
tf.concat([inputs, h0, h1], 1), 5 * self._num_units)
# i = input_gate, j = new_input, f = forget_gate, o = output_gate
i, j, f0, f1, o = tf.split(value=concat,
num_or_size_splits=5,
axis=1)
j = self._activation(j)
if not isinstance(self._keep_prob,
float) or self._keep_prob < 1:
j = tf.nn.dropout(j, self._keep_prob)
new_c = (c0 * tf.sigmoid(f0 + self._forget_bias) +
c1 * tf.sigmoid(f1 + self._forget_bias) +
tf.sigmoid(i) * j)
new_h = self._activation(new_c) * tf.sigmoid(o)
new_state = tf.contrib.rnn.LSTMStateTuple(new_c, new_h)
return new_h, new_state
keep_prob_ph = tf.placeholder_with_default(1.0, [])
lstm_num_units = 150 # Tai et al. used 150, but our regularization strategy is more effective
tree_lstm = td.ScopedLayer(tf.contrib.rnn.DropoutWrapper(
BinaryTreeLSTMCell(lstm_num_units, keep_prob=keep_prob_ph),
input_keep_prob=keep_prob_ph,
output_keep_prob=keep_prob_ph),
name_or_scope='tree_lstm')
NUM_CLASSES = 5 # number of distinct sentiment labels
output_layer = td.FC(NUM_CLASSES, activation=None, name='output_layer')
word_embedding = td.Embedding(*weight_matrix.shape,
initializer=weight_matrix,
name='word_embedding',
trainable=False)
embed_subtree = td.ForwardDeclaration(name='embed_subtree')
def logits_and_state():
"""Creates a block that goes from tokens to (logits, state) tuples."""
unknown_idx = len(word_idx)
lookup_word = lambda word: word_idx.get(word, unknown_idx)
word2vec = (td.GetItem(0) >> td.InputTransform(lookup_word) >>
td.Scalar('int32') >> word_embedding)
pair2vec = (embed_subtree(), embed_subtree())
# Trees are binary, so the tree layer takes two states as its input_state.
zero_state = td.Zeros((tree_lstm.state_size, ) * 2)
# Input is a word vector.
zero_inp = td.Zeros(word_embedding.output_type.shape[0])
word_case = td.AllOf(word2vec, zero_state)
pair_case = td.AllOf(zero_inp, pair2vec)
tree2vec = td.OneOf(len, [(1, word_case), (2, pair_case)])
return tree2vec >> tree_lstm >> (output_layer, td.Identity())
def tf_node_loss(logits, labels):
return tf.nn.sparse_softmax_cross_entropy_with_logits(logits=logits,
labels=labels)
def tf_fine_grained_hits(logits, labels):
predictions = tf.cast(tf.argmax(logits, 1), tf.int32)
return tf.cast(tf.equal(predictions, labels), tf.float64)
def tf_binary_hits(logits, labels):
softmax = tf.nn.softmax(logits)
binary_predictions = (softmax[:, 3] + softmax[:, 4]) > (softmax[:, 0] +
softmax[:, 1])
binary_labels = labels > 2
return tf.cast(tf.equal(binary_predictions, binary_labels), tf.float64)
def add_metrics(is_root, is_neutral):
"""A block that adds metrics for loss and hits; output is the LSTM state."""
c = td.Composition(name='predict(is_root=%s, is_neutral=%s)' %
(is_root, is_neutral))
with c.scope():
# destructure the input; (labels, (logits, state))
labels = c.input[0]
logits = td.GetItem(0).reads(c.input[1])
state = td.GetItem(1).reads(c.input[1])
# calculate loss
loss = td.Function(tf_node_loss)
td.Metric('all_loss').reads(loss.reads(logits, labels))
if is_root: td.Metric('root_loss').reads(loss)
# calculate fine-grained hits
hits = td.Function(tf_fine_grained_hits)
td.Metric('all_hits').reads(hits.reads(logits, labels))
if is_root: td.Metric('root_hits').reads(hits)
# calculate binary hits, if the label is not neutral
if not is_neutral:
binary_hits = td.Function(tf_binary_hits).reads(logits, labels)
td.Metric('all_binary_hits').reads(binary_hits)
if is_root: td.Metric('root_binary_hits').reads(binary_hits)
# output the state, which will be read by our by parent's LSTM cell
c.output.reads(state)
return c
def tokenize(s):
label, phrase = s[1:-1].split(None, 1)
return label, sexpr.sexpr_tokenize(phrase)
def embed_tree(logits_and_state, is_root):
"""Creates a block that embeds trees; output is tree LSTM state."""
return td.InputTransform(tokenize) >> td.OneOf(
key_fn=lambda pair: pair[0] == '2', # label 2 means neutral
case_blocks=(add_metrics(is_root, is_neutral=False),
add_metrics(is_root, is_neutral=True)),
pre_block=(td.Scalar('int32'), logits_and_state))
model = embed_tree(logits_and_state(), is_root=True)
embed_subtree.resolve_to(embed_tree(logits_and_state(), is_root=False))
compiler = td.Compiler.create(model)
print('input type: %s' % model.input_type)
print('output type: %s' % model.output_type)
metrics = {
k: tf.reduce_mean(v)
for k, v in compiler.metric_tensors.items()
}
LEARNING_RATE = 0.05
KEEP_PROB = 1.0
BATCH_SIZE = batch_size_setting #20
EPOCHS = 6
EMBEDDING_LEARNING_RATE_FACTOR = 0
train_feed_dict = {keep_prob_ph: KEEP_PROB}
loss = tf.reduce_sum(compiler.metric_tensors['all_loss'])
opt = tf.train.AdagradOptimizer(LEARNING_RATE)
grads_and_vars = opt.compute_gradients(loss)
found = 0
for i, (grad, var) in enumerate(grads_and_vars):
if var == word_embedding.weights:
found += 1
grad = tf.scalar_mul(EMBEDDING_LEARNING_RATE_FACTOR, grad)
grads_and_vars[i] = (grad, var)
#assert found == 1 # internal consistency check
train = opt.apply_gradients(grads_and_vars)
saver = tf.train.Saver()
sess.run(tf.global_variables_initializer())
def train_step(batch):
train_feed_dict[compiler.loom_input_tensor] = batch
_, batch_loss = sess.run([train, loss], train_feed_dict)
return batch_loss
def train_epoch(train_set):
return sum(
train_step(batch)
for batch in td.group_by_batches(train_set, BATCH_SIZE))
train_set = compiler.build_loom_inputs(train_trees)
"""
dev_feed_dict = compiler.build_feed_dict(dev_trees)
def dev_eval(epoch, train_loss):
dev_metrics = sess.run(metrics, dev_feed_dict)
dev_loss = dev_metrics['all_loss']
dev_accuracy = ['%s: %.2f' % (k, v * 100) for k, v in
sorted(dev_metrics.items()) if k.endswith('hits')]
print('epoch:%4d, train_loss: %.3e, dev_loss_avg: %.3e, dev_accuracy:\n [%s]'
% (epoch, train_loss, dev_loss, ' '.join(dev_accuracy)))
return dev_metrics['root_hits']
"""
best_accuracy = 0.0
save_path = os.path.join(data_dir, 'sentiment_model')
loopTime = time.time()
#print('prepare time %s ' % (loopTime - startTime))
loss_save = []
time_save = []
epoch_start_time = loopTime
for epoch, shuffled in enumerate(td.epochs(train_set, EPOCHS), 1):
train_loss = train_epoch(shuffled)
av_loss = train_loss / trainSIZE
epoch_end_time = time.time()
epoch_time = epoch_end_time - epoch_start_time
time_save.append(epoch_time)
epoch_start_time = epoch_end_time
print('train loss is %s at time %s' % (av_loss, epoch_time))
loss_save.append(av_loss)
#accuracy = dev_eval(epoch, train_loss)
#if accuracy > best_accuracy:
# best_accuracy = accuracy
# checkpoint_path = saver.save(sess, save_path, global_step=epoch)
# print('model saved in file: %s' % checkpoint_path)
loopEndTime = time.time()
#print('loop time %s ' % (loopEndTime - loopTime))
prepareTime = loopTime - startTime
loopTime = loopEndTime - loopTime
timePerEpoch = loopTime / EPOCHS
# use median time instead
time_save.sort()
median_time = time_save[int(EPOCHS / 2)]
with open(write_to, "w") as f:
f.write("unit: " + "1 epoch\n")
for loss in loss_save:
f.write(str(loss) + "\n")
f.write("run time: " + str(prepareTime) + " " + str(median_time) +
"\n")
def _compile(self):
with self.sess.as_default():
import tensorflow_fold as td
output_size = len(self.labels)
self.keep_prob = tf.placeholder_with_default(tf.constant(1.0),shape=None)
fshape = (self.window_size * (self.char_embedding_size + self.char_feature_embedding_size), self.num_filters)
filt_w3 = tf.Variable(tf.random_normal(fshape, stddev=0.05))
def CNN_Window3(filters):
return td.Function(lambda a, b, c: cnn_operation([a,b,c],filters))
def cnn_operation(window_sequences,filters):
windows = tf.concat(window_sequences,axis=-1)
products = tf.multiply(tf.expand_dims(windows,axis=-1),filters)
return tf.reduce_sum(products,axis=-2)
char_emb = td.Embedding(num_buckets=self.char_buckets,
num_units_out=self.char_embedding_size)
cnn_layer = (td.NGrams(self.window_size)
>> td.Map(CNN_Window3(filt_w3))
>> td.Max())
# --------- char features
def charfeature_lookup(c):
if c in string.lowercase:
return 0
elif c in string.uppercase:
return 1
elif c in string.punctuation:
return 2
else:
return 3
char_input = td.Map(td.InputTransform(lambda c: ord(c.lower()))
>> td.Scalar('int32') >> char_emb)
char_features = td.Map(td.InputTransform(charfeature_lookup)
>> td.Scalar(dtype='int32')
>> td.Embedding(num_buckets=4,
num_units_out=self.char_feature_embedding_size))
charlevel = (td.InputTransform(lambda s: ['~'] + [ c for c in s ] + ['~'])
>> td.AllOf(char_input,char_features) >> td.ZipWith(td.Concat())
>> cnn_layer)
# --------- word features
word_emb = td.Embedding(num_buckets=len(self.word_vocab),
num_units_out=self.embedding_size,
initializer=self.word_embeddings)
wordlookup = lambda w: (self.word_vocab.index(w.lower())
if w.lower() in self.word_vocab else 0)
wordinput = (td.InputTransform(wordlookup)
>> td.Scalar(dtype='int32')
>> word_emb)
def wordfeature_lookup(w):
if re.match('^[a-z]+$',w):
return 0
elif re.match('^[A-Z][a-z]+$',w):
return 1
elif re.match('^[A-Z]+$',w):
return 2
elif re.match('^[A-Za-z]+$',w):
return 3
else:
return 4
wordfeature = (td.InputTransform(wordfeature_lookup)
>> td.Scalar(dtype='int32')
>> td.Embedding(num_buckets=5,
num_units_out=32))
#-----------
rnn_fwdcell = td.ScopedLayer(tf.contrib.rnn.LSTMCell(
num_units=self.rnn_dim), 'lstm_fwd')
fwdlayer = td.RNN(rnn_fwdcell) >> td.GetItem(0)
rnn_bwdcell = td.ScopedLayer(tf.contrib.rnn.LSTMCell(
num_units=self.rnn_dim), 'lstm_bwd')
bwdlayer = (td.Slice(step=-1) >> td.RNN(rnn_bwdcell)
>> td.GetItem(0) >> td.Slice(step=-1))
rnn_layer = td.AllOf(fwdlayer, bwdlayer) >> td.ZipWith(td.Concat())
output_layer = td.FC(output_size,
input_keep_prob=self.keep_prob,
activation=None)
wordlevel = td.AllOf(wordinput,wordfeature) >> td.Concat()
network = (td.Map(td.AllOf(wordlevel,charlevel) >> td.Concat())
>> rnn_layer
>> td.Map(output_layer)
>> td.Map(td.Metric('y_out'))) >> td.Void()
groundlabels = td.Map(td.Vector(output_size,dtype=tf.int32)
>> td.Metric('y_true')) >> td.Void()
self.compiler = td.Compiler.create((network, groundlabels))
self.y_out = self.compiler.metric_tensors['y_out']
self.y_true = self.compiler.metric_tensors['y_true']
self.y_loss = tf.reduce_mean(
tf.nn.softmax_cross_entropy_with_logits(
logits=self.y_out,labels=self.y_true))
self.y_prob = tf.nn.softmax(self.y_out)
self.y_true_idx = tf.argmax(self.y_true,axis=-1)
self.y_pred_idx = tf.argmax(self.y_prob,axis=-1)
self.y_pred = tf.one_hot(self.y_pred_idx,depth=output_size,dtype=tf.int32)
epoch_step = tf.Variable(0, trainable=False)
self.epoch_step_op = tf.assign(epoch_step, epoch_step+1)
lrate_decay = tf.train.exponential_decay(self.lrate, epoch_step, 1, self.decay)
if self.optimizer == 'adam':
self.opt = tf.train.AdamOptimizer(learning_rate=lrate_decay)
elif self.optimizer == 'adagrad':
self.opt = tf.train.AdagradOptimizer(learning_rate=lrate_decay,
initial_accumulator_value=1e-08)
elif self.optimizer == 'rmsprop':
self.opt = tf.train.RMSPropOptimizer(learning_rate=lrate_decay,
epsilon=1e-08)
else:
raise Exception(('The optimizer {} is not in list of available '
+ 'optimizers: default, adam, adagrad, rmsprop.')
.format(self.optimizer))
# apply learning multiplier on on embedding learning rate
embeds = [word_emb.weights]
grads_and_vars = self.opt.compute_gradients(self.y_loss)
found = 0
for i, (grad, var) in enumerate(grads_and_vars):
if var in embeds:
found += 1
grad = tf.scalar_mul(self.embedding_factor, grad)
grads_and_vars[i] = (grad, var)
assert found == len(embeds) # internal consistency check
self.train_step = self.opt.apply_gradients(grads_and_vars)
self.sess.run(tf.global_variables_initializer())
self.saver = tf.train.Saver(max_to_keep=100)
weights = {}
similarity_w = tf.Variable(tf.random_normal([2, embedding_size * 2]),
name='simi_w')
similarity_b = tf.Variable(tf.random_normal([2, 1]), name='simi_b')
answers = [
tf.constant(np.asarray([[1], [0]]), dtype=tf.float32),
tf.constant(np.asarray([[0], [1]]), dtype=tf.float32)
]
learning_rate = 0.001
epsilon = tf.constant(value=1e-5)
number_classes = 2
embedding = td.Embedding(152800, embedding_size, name='embedding_layer')
fc = td.FC(embedding_size, name='fully_connected_layer')
def buid_sentence_expression():
sentence_tree = td.InputTransform(
lambda sentence_json: WordNode(sentence_json))
tree_rnn = td.ForwardDeclaration(td.PyObjectType())
leaf_case = td.GetItem(
'word_id', name='leaf_in') >> td.Scalar(dtype=tf.int32) >> embedding
index_case = td.Record({'left': tree_rnn(), 'right': tree_rnn()}) \
>> td.Concat(name='concat_root_child') \
>> fc
expr_sentence = td.OneOf(td.GetItem('leaf'), {
True: leaf_case,
def reduce_net_block():
net_block = td.Concat() >> td.FC(20) >> td.FC(20) >> td.FC(1, activation=None) >> td.Function(lambda xs: tf.squeeze(xs, axis=1))
return td.Map(td.Scalar()) >> td.Reduce(net_block)
def buid_sentence_expression():
sentence_tree = td.InputTransform(lambda sentence_json: WNJsonDecoder(sentence_json))
tree_rnn = td.ForwardDeclaration(td.PyObjectType())
leaf_case = td.GetItem('word_vec', name='leaf_in') >> td.Vector(embedding_size)
index_case = td.Record({'children': td.Map(tree_rnn()) >> td.Mean(), 'word_vec': td.Vector(embedding_size)}, name='index_in') >> td.Concat(name='concat_root_child') >> td.FC(embedding_size, name='FC_root_child')
expr_sentence = td.OneOf(td.GetItem('leaf'), {True: leaf_case, False: index_case}, name='recur_in')
tree_rnn.resolve_to(expr_sentence)
return sentence_tree >> expr_sentence
def build_VAE(z_size, token_emb_size):
c = td.Composition()
c.set_input_type(td.SequenceType(td.TensorType(([token_emb_size]), 'float32')))
with c.scope():
# input_sequence = td.Map(td.Vector(token_emb_size)).reads(c.input)
input_sequence = c.input
# encoder composition TODO: refactor this out
# rnn_cell = td.ScopedLayer(
# tf.contrib.rnn.LSTMCell(
# num_units=2*z_size,
# initializer=tf.contrib.layers.xavier_initializer(),
# activation=tf.tanh
# ),
# 'encoder'
# )
encoder_rnn_cell = td.ScopedLayer(
tf.contrib.rnn.GRUCell(
num_units=2*z_size,
# initializer=tf.contrib.layers.xavier_initializer(),
activation=tf.tanh
),
'encoder'
)
output_sequence = td.RNN(encoder_rnn_cell) >> td.GetItem(0)
mus_and_log_sigs = output_sequence >> td.GetItem(-1)
# reparam_z = mus_and_log_sigs >> td.Function(resampling)
reparam_z = td.Function(resampling, name='resampling')
reparam_z.set_input_type(td.TensorType((2 * z_size,)))
reparam_z.set_output_type(td.TensorType((z_size,)))
# A list of same length of input_sequence, but with empty values
# this is used for the decoder to map over
list_of_nothing = td.Map(
td.Void() >> td.FromTensor(tf.zeros((0,)))
)
# decoder composition
# TODO: refactor this out
# decoder_rnn = td.ScopedLayer(
# tf.contrib.rnn.LSTMCell(
# num_units=z_size,
# initializer=tf.contrib.layers.xavier_initializer(),
# activation=tf.tanh
# ),
# 'decoder'
# )
decoder_rnn = td.ScopedLayer(
tf.contrib.rnn.GRUCell(
num_units=z_size,
# initializer=tf.contrib.layers.xavier_initializer(),
activation=tf.tanh
),
'decoder'
)
decoder_rnn_output = td.RNN(
decoder_rnn,
initial_state_from_input=True
) >> td.GetItem(0)
fc_layer = td.FC(
token_emb_size,
activation=tf.nn.relu,
initializer=tf.contrib.layers.xavier_initializer()
)
un_normalised_token_probs = decoder_rnn_output >> td.Map(fc_layer)
# reparam_z.reads(input_sequence)
mus_and_log_sigs.reads(input_sequence)
reparam_z.reads(mus_and_log_sigs)
list_of_nothing.reads(input_sequence)
un_normalised_token_probs.reads(list_of_nothing, reparam_z)
c.output.reads(un_normalised_token_probs, mus_and_log_sigs)
return c
