def build_model(self):
# Representation Generator
self.inputs = tf.placeholder(tf.int32, [self.batch_size, self.seq_length])
embed = tf.get_variable("embed", [self.vocab_size, self.embed_dim])
word_embeds = tf.nn.embedding_lookup(embed, self.inputs)
self.cell = rnn_cell.BasicLSTMCell(self.rnn_size)
self.stacked_cell = rnn_cell.MultiRNNCell([self.cell] * self.layer_depth)
outputs, _ = rnn.rnn(self.cell,
[tf.squeeze(embed_t) for embed_t in tf.split(1, self.seq_length, word_embeds)],
dtype=tf.float32)
output_embed = tf.pack(outputs)
mean_pool = tf.nn.relu(tf.reduce_mean(output_embed, 1))
self.num_action = 4
self.object_size = 4
# Action scorer. no bias in paper
self.pred_action = rnn_cell.linear(mean_pool, self.num_action, 0, "action")
self.object_ = rnn_cell.linear(mean_pool, self.object_size, 0, "object")
self.true_action = tf.placeholder(tf.int32, [self.batch_size, self.num_action])
def attention(input_t,output_t_minus_1,time):
with tf.variable_scope('attention'):
VxS = tf.reshape(rnn_cell.linear(output_t_minus_1,self.attention_judge_size,True),[-1,1,1,self.attention_judge_size]) #batch_size x 1 x 1 x attention
_exp = tf.exp(tf.reduce_sum( attention_V * tf.tanh(WxH+VxS), [3]))#batch_size x source_len x 1
_exp = _exp*tf.expand_dims(self.mask,-1)
attention_weight = _exp/tf.reduce_sum(_exp,[1], keep_dims=True)
attention_t = tf.reduce_sum(encoder_outputs*attention_weight,[1])
feed_in_t = tf.tanh(rnn_cell.linear([attention_t,input_t],self.embedding_size,True))
return feed_in_t
def attention(input_t,output_t_minus_1,time):
with tf.variable_scope('attention'):
VxS = tf.reshape(rnn_cell.linear(output_t_minus_1,self.attention_judge_size,True),[-1,1,1,self.attention_judge_size]) #batch_size x 1 x 1 x attention
_exp = tf.exp(tf.reduce_sum( attention_V * tf.tanh(WxH+VxS), [3]))#batch_size x source_len x 1
_exp = _exp*tf.expand_dims(self.mask,-1)
attention_weight = _exp/tf.reduce_sum(_exp,[1], keep_dims=True)
attention_t = tf.reduce_sum(encoder_outputs*attention_weight,[1])
feed_in_t = tf.tanh(rnn_cell.linear([attention_t,input_t],self.embedding_size,True))
return feed_in_t
def __call__(self, inputs, state, scope=None):
"""Gated recurrent unit (GRU) with nunits cells."""
with vs.variable_scope(scope or type(self).__name__): # "GRUCell"
with vs.variable_scope("Gates"): # Reset gate and update gate.
# We start with bias of 1.0 to not reset and not update.
r, u = array_ops.split(1, 2, rnn_cell.linear([inputs, state],
2 * self._num_units, True, 1.0))
r, u = tf.sigmoid(r), tf.sigmoid(u)
with vs.variable_scope("Candidate"):
c = self._activation(rnn_cell.linear([inputs, r * state], self._num_units, True))
new_h = u * state + (1 - u) * c
return new_h, new_h
def __call__(self, inputs, state, con):
with tf.variable_scope(type(self).__name__):
# batch_size x 3(cluster_size)
concat = rnn_cell.linear(inputs, 3 * self._cluster_size, True)
a, b, k = tf.split(1, 3, concat)
ao = tf.exp(a)
bo = tf.exp(b)
ko = state + tf.exp(k) # batch_size x _cluster_size
phi = []
for i in range(self._con_size):
# each phi is [batch_size x 1]
phi.append(
tf.reduce_sum(ao * tf.exp(-bo * tf.square(ko - i)),
1,
keep_dims=True))
# tf.concat(1, phi) -> [batch_size x seq_length]
# tf.expan_dims(%, 1) -> [batch_size x 1 x seq_length]
# tf.batch_matmul(%, con) -> [batch_size x 1 x vocab_size]
# tf.squeeze(%) -> [batch_size x vocab_size]
wt = tf.squeeze(
tf.batch_matmul(tf.expand_dims(tf.concat(1, phi), 1), con),
[1])
return wt, ko
def highway(input_, size, layer_size=1, bias=-2, f=tf.nn.relu):
"""Highway Network (cf. http://arxiv.org/abs/1505.00387).
t = sigmoid(Wy + b)
z = t * g(Wy + b) + (1 - t) * y
where g is nonlinearity, t is transform gate, and (1 - t) is carry gate.
"""
output = input_
for idx in xrange(layer_size):
output = f(rnn_cell.linear(output, size, 0, scope='output_lin_%d' % idx))
transform_gate = tf.sigmoid(
rnn_cell.linear(input_, size, 0, scope='transform_lin_%d' % idx) + bias)
carry_gate = 1. - transform_gate
output = transform_gate * output + carry_gate * input_
return output
def __call__(self, inputs, scope=None):
"""
:param inputs: list of 2D Tensors with shape [batch_size x self.from_size]
:return: list of 2D Tensors with shape [batch_size x self.to_size]
"""
with vs.variable_scope(scope or "Projector"):
projected = linear(inputs, self.to_size, self.bias)
if self.non_linearity is not None:
projected = self.non_linearity(projected)
return projected
def highway(input_, size, layer_size=1, bias=-2, f=tf.nn.relu):
"""Highway Network (cf. http://arxiv.org/abs/1505.00387).
t = sigmoid(Wy + b)
z = t * g(Wy + b) + (1 - t) * y
where g is nonlinearity, t is transform gate, and (1 - t) is carry gate.
"""
output = input_
for idx in xrange(layer_size):
output = f(
rnn_cell.linear(output, size, 0, scope='output_lin_%d' % idx))
transform_gate = tf.sigmoid(
rnn_cell.linear(input_, size, 0, scope='transform_lin_%d' % idx) +
bias)
carry_gate = 1. - transform_gate
output = transform_gate * output + carry_gate * input_
return output
def __call__(self, inputs, state, scope=None):
"""Long short-term memory cell (LSTM)."""
with vs.variable_scope(scope or type(self).__name__): # "BasicLSTMCell"
# Parameters of gates are concatenated into one multiply for efficiency.
c, h = array_ops.split(1, 2, state)
concat = rnn_cell.linear([inputs, h], 4 * self._num_units, True)
# i = input_gate, j = new_input, f = forget_gate, o = output_gate
i, j, f, o = array_ops.split(1, 4, concat)
new_c = c * tf.sigmoid(f + self._forget_bias) + tf.sigmoid(i) * self._activation(j)
new_h = self._activation(new_c) * tf.sigmoid(o)
return new_h, array_ops.concat(1, [new_c, new_h])
def __call__(self, inputs, state, scope=None):
"""Long short-term memory cell (LSTM)."""
with tf.variable_scope("BasicLSTMCell"):
h = state
if self.c == None: self.c = tf.reshape(tf.zeros_like(h), [-1, self._num_units])
concat = linear([inputs, h, self.c], 4 * self._num_units, True)
i, j, f, o = tf.split(1, 4, concat)
self.c = self.c * tf.sigmoid(f + self._forget_bias) + tf.sigmoid(i) * tf.tanh(j)
new_h = tf.tanh(self.c) * tf.sigmoid(o)
softmax_w = tf.get_variable("softmax_w", [self._num_units, self._num_units])
softmax_b = tf.get_variable("softmax_b", [self._num_units])
new_y = tf.nn.xw_plus_b(new_h, softmax_w, softmax_b)
return new_y, new_y
def __call__(self, inputs, state, scope=None):
"""Long short-term memory cell (LSTM)."""
with tf.variable_scope("BasicLSTMCell"):
h = state
if self.c == None:
self.c = tf.reshape(tf.zeros_like(h), [-1, self._num_units])
concat = linear([inputs, h, self.c], 4 * self._num_units, True)
i, j, f, o = tf.split(1, 4, concat)
self.c = self.c * tf.sigmoid(f + self._forget_bias) + tf.sigmoid(
i) * tf.tanh(j)
new_h = tf.tanh(self.c) * tf.sigmoid(o)
softmax_w = tf.get_variable("softmax_w",
[self._num_units, self._num_units])
softmax_b = tf.get_variable("softmax_b", [self._num_units])
new_y = tf.nn.xw_plus_b(new_h, softmax_w, softmax_b)
return new_y, new_y
def __call__(self, inputs, state, con):
with tf.variable_scope(type(self).__name__):
# batch_size x 3(cluster_size)
concat = rnn_cell.linear(inputs, 3 * self._cluster_size, True)
a, b, k = tf.split(1, 3, concat)
ao = tf.exp(a)
bo = tf.exp(b)
ko = state + tf.exp(k) # batch_size x _cluster_size
phi = []
for i in range(self._con_size):
# each phi is [batch_size x 1]
phi.append(tf.reduce_sum(ao * tf.exp(- bo * tf.square(ko - i)), 1, keep_dims=True))
# tf.concat(1, phi) -> [batch_size x seq_length]
# tf.expan_dims(%, 1) -> [batch_size x 1 x seq_length]
# tf.batch_matmul(%, con) -> [batch_size x 1 x vocab_size]
# tf.squeeze(%) -> [batch_size x vocab_size]
wt = tf.squeeze(tf.batch_matmul(tf.expand_dims(tf.concat(1, phi), 1), con), [1])
return wt, ko
def prepare_model(self):
with tf.variable_scope("LSTMTDNN"):
self.char_inputs = []
self.word_inputs = []
self.cnn_outputs = []
if self.use_char:
char_W = tf.get_variable(
"char_embed", [self.char_vocab_size, self.char_embed_dim])
else:
word_W = tf.get_variable(
"word_embed", [self.word_vocab_size, self.word_embed_dim])
with tf.variable_scope("CNN") as scope:
self.char_inputs = tf.placeholder(
tf.int32,
[self.batch_size, self.seq_length, self.max_word_length])
self.word_inputs = tf.placeholder(
tf.int32, [self.batch_size, self.seq_length])
char_indices = tf.split(1, self.seq_length, self.char_inputs)
word_indices = tf.split(1, self.seq_length,
tf.expand_dims(self.word_inputs, -1))
for idx in xrange(self.seq_length):
char_index = tf.reshape(char_indices[idx],
[-1, self.max_word_length])
word_index = tf.reshape(word_indices[idx], [-1, 1])
if idx != 0:
scope.reuse_variables()
if self.use_char:
# [batch_size x word_max_length, char_embed]
char_embed = tf.nn.embedding_lookup(char_W, char_index)
char_cnn = TDNN(char_embed, self.char_embed_dim,
self.feature_maps, self.kernels)
if self.use_word:
word_embed = tf.nn.embedding_lookup(
word_W, word_index)
cnn_output = tf.concat(1, char_cnn.output,
word_embed)
else:
cnn_output = char_cnn.output
else:
cnn_output = tf.squeeze(
tf.nn.embedding_lookup(word_W, word_index))
if self.use_batch_norm:
bn = batch_norm()
norm_output = bn(
tf.expand_dims(tf.expand_dims(cnn_output, 1), 1))
cnn_output = tf.squeeze(norm_output)
if highway:
#cnn_output = highway(input_, input_dim_length, self.highway_layers, 0)
cnn_output = highway(cnn_output,
cnn_output.get_shape()[1],
self.highway_layers, 0)
self.cnn_outputs.append(cnn_output)
with tf.variable_scope("LSTM") as scope:
self.cell = rnn_cell.BasicLSTMCell(self.rnn_size)
self.stacked_cell = rnn_cell.MultiRNNCell([self.cell] *
self.layer_depth)
outputs, _ = rnn.rnn(self.stacked_cell,
self.cnn_outputs,
dtype=tf.float32)
self.lstm_outputs = []
self.true_outputs = tf.placeholder(
tf.float32,
[self.batch_size, self.seq_length, self.word_vocab_size])
loss = 0
true_outputs = tf.split(1, self.seq_length, self.true_outputs)
for idx, (top_h,
true_output) in enumerate(zip(outputs,
true_outputs)):
if self.dropout_prob > 0:
top_h = tf.nn.dropout(top_h, self.dropout_prob)
if self.hsm > 0:
self.lstm_outputs.append(top_h)
else:
if idx != 0:
scope.reuse_variables()
proj = rnn_cell.linear(top_h, self.word_vocab_size, 0)
log_softmax = tf.log(tf.nn.softmax(proj))
self.lstm_outputs.append(log_softmax)
loss += tf.nn.softmax_cross_entropy_with_logits(
self.lstm_outputs[idx], tf.squeeze(true_output))
self.loss = tf.reduce_mean(loss) / self.seq_length
tf.scalar_summary("loss", self.loss)
tf.scalar_summary("perplexity", tf.exp(self.loss))
def __call__(self, inputs, state, scope=None):
"""Most basic RNN: output = new_state = tanh(W * input + U * state + B)."""
with vs.variable_scope(scope or type(self).__name__): # "BasicRNNCell"
output = self._activation(rnn_cell.linear([inputs, state], self._num_units, True))
return output, output
def build_model(self):
with tf.variable_scope('RNNTEST'):
self.sense = tf.placeholder(tf.int32, [None])
self.arg1 = tf.placeholder(tf.int32, [None, None, 4])
self.arg2 = tf.placeholder(tf.int32, [None, None, 4])
self.arg1_len = tf.placeholder(tf.int32, [None])
self.arg2_len = tf.placeholder(tf.int32, [None])
self.keep_prob = tf.placeholder(tf.float32)
arg1_list = tf.split(2, 4, self.arg1)
arg2_list = tf.split(2, 4, self.arg2)
with tf.device('/cpu:0'):
NER_W = tf.get_variable('NER_embed', [
self.data_loader.NER_vocab_size, self.NER_embed_size
]) if self.NER_embed_size > 0 else None
lemma_W = tf.get_variable('lemma_embed', [
self.data_loader.lemma_vocab_size, self.lemma_embed_size
]) if self.lemma_embed_size > 0 else None
if self.use_pre_trained_embedding:
word_W = tf.get_variable(
'word_embed',
initializer=tf.convert_to_tensor(
self.data_loader.pre_trained_word_embeddings,
dtype=tf.float32)
) if self.word_embed_size > 0 else None
else:
word_W = tf.get_variable(
'word_embed',
shape=[
self.data_loader.word_vocab_size,
self.word_embed_size
]) if self.word_embed_size > 0 else None
POS_W = tf.get_variable('POS_embed', [
self.data_loader.POS_vocab_size, self.POS_embed_size
]) if self.POS_embed_size > 0 else None
arg1_embed_list = []
arg2_embed_list = []
for idx, W in enumerate([NER_W, lemma_W, word_W, POS_W]):
if W is not None:
arg1_embed_list.append(
tf.nn.embedding_lookup(W,
tf.squeeze(arg1_list[idx],
[2])))
arg2_embed_list.append(
tf.nn.embedding_lookup(W,
tf.squeeze(arg2_list[idx],
[2])))
arg1 = tf.nn.dropout(tf.concat(2, arg1_embed_list), self.keep_prob)
arg2 = tf.nn.dropout(tf.concat(2, arg2_embed_list), self.keep_prob)
encoder_lstm_unit = rnn_cell.BasicLSTMCell(self.encoder_size)
decoder_lstm_unit = rnn_cell.BasicLSTMCell(self.decoder_size)
with tf.variable_scope('forward_encoder'):
forward_encoder_outputs, forward_encoder_state = rnn.dynamic_rnn(
encoder_lstm_unit, arg1, self.arg1_len, dtype=tf.float32)
with tf.variable_scope('backward_encoder'):
backward_encoder_outputs, backward_encoder_state = rnn.dynamic_rnn(
encoder_lstm_unit,
tf.reverse_sequence(arg1, tf.cast(self.arg1_len, tf.int64),
1),
dtype=tf.float32)
encoder_outputs = tf.concat(2, [
forward_encoder_outputs,
tf.reverse_sequence(backward_encoder_outputs,
tf.cast(self.arg1_len, tf.int64), 1)
])
encoder_state = tf.concat(
1, [forward_encoder_state, backward_encoder_state])
source = tf.expand_dims(
encoder_outputs,
2) #batch_size x source_len x 1 x source_depth(2*encoder_size)
attention_W = tf.get_variable(
'attention_W',
[1, 1, 2 * self.encoder_size, self.attention_judge_size])
attention_V = tf.get_variable('attention_V',
[self.attention_judge_size])
WxH = tf.nn.conv2d(
source, attention_W, [1, 1, 1, 1],
'SAME') #batch_size x source_len x 1 x attention
self.mask = tf.placeholder(tf.float32, [None, None])
def attention(input_t, output_t_minus_1, time):
with tf.variable_scope('attention'):
VxS = tf.reshape(
rnn_cell.linear(output_t_minus_1,
self.attention_judge_size, True),
[-1, 1, 1, self.attention_judge_size
]) #batch_size x 1 x 1 x attention
_exp = tf.exp(
tf.reduce_sum(attention_V * tf.tanh(WxH + VxS),
[3])) #batch_size x source_len x 1
_exp = _exp * tf.expand_dims(self.mask, -1)
attention_weight = _exp / tf.reduce_sum(_exp, [1],
keep_dims=True)
attention_t = tf.reduce_sum(encoder_outputs * attention_weight,
[1])
feed_in_t = tf.tanh(
rnn_cell.linear([attention_t, input_t],
self.embedding_size, True))
return feed_in_t
with tf.variable_scope('decoder'):
decoder_outputs, decoder_state = dynamic_rnn_decoder(
arg2,
decoder_lstm_unit,
initial_state=encoder_state,
sequence_length=self.arg2_len,
loop_function=attention)
judge = tf.concat(1, [
tf.reduce_sum(decoder_outputs, [1]) /
tf.expand_dims(tf.cast(self.arg2_len, tf.float32), -1),
tf.reduce_sum(encoder_outputs, [1]) /
tf.expand_dims(tf.cast(self.arg1_len, tf.float32), -1)
])
unscaled_log_distribution = rnn_cell.linear(
judge, self.data_loader.sense_vocab_size, True)
self.output = tf.cast(tf.argmax(unscaled_log_distribution, 1),
tf.int32)
self.accuracy = tf.reduce_mean(
tf.cast(tf.equal(self.output, self.sense), tf.float32))
#max-margin method
#self._MM = tf.placeholder(tf.int32,[None])
#margin = tf.sub(tf.reduce_max(unscaled_log_distribution,[1]),tf.gather(tf.reshape(unscaled_log_distribution,[-1]),self._MM))
#self.loss = tf.reduce_mean(margin)
#maximum likelihood method
self.loss = tf.reduce_mean(
tf.nn.sparse_softmax_cross_entropy_with_logits(
unscaled_log_distribution, self.sense))
self.optimizer = tf.train.AdagradOptimizer(self.lr)
self.train_op = self.optimizer.minimize(self.loss)
def prepare_model(self):
with tf.variable_scope("LSTMTDNN"):
self.char_inputs = []
self.word_inputs = []
self.cnn_outputs = []
if self.use_char:
char_W = tf.get_variable("char_embed",
[self.char_vocab_size, self.char_embed_dim])
else:
word_W = tf.get_variable("word_embed",
[self.word_vocab_size, self.word_embed_dim])
with tf.variable_scope("CNN") as scope:
self.char_inputs = tf.placeholder(tf.int32, [self.batch_size, self.seq_length, self.max_word_length])
self.word_inputs = tf.placeholder(tf.int32, [self.batch_size, self.seq_length])
char_indices = tf.split(1, self.seq_length, self.char_inputs)
word_indices = tf.split(1, self.seq_length, tf.expand_dims(self.word_inputs, -1))
for idx in xrange(self.seq_length):
char_index = tf.reshape(char_indices[idx], [-1, self.max_word_length])
word_index = tf.reshape(word_indices[idx], [-1, 1])
if idx != 0:
scope.reuse_variables()
if self.use_char:
# [batch_size x word_max_length, char_embed]
char_embed = tf.nn.embedding_lookup(char_W, char_index)
char_cnn = TDNN(char_embed, self.char_embed_dim, self.feature_maps, self.kernels)
if self.use_word:
word_embed = tf.nn.embedding_lookup(word_W, word_index)
cnn_output = tf.concat(1, char_cnn.output, word_embed)
else:
cnn_output = char_cnn.output
else:
cnn_output = tf.squeeze(tf.nn.embedding_lookup(word_W, word_index))
if self.use_batch_norm:
bn = batch_norm()
norm_output = bn(tf.expand_dims(tf.expand_dims(cnn_output, 1), 1))
cnn_output = tf.squeeze(norm_output)
if highway:
#cnn_output = highway(input_, input_dim_length, self.highway_layers, 0)
cnn_output = highway(cnn_output, cnn_output.get_shape()[1], self.highway_layers, 0)
self.cnn_outputs.append(cnn_output)
with tf.variable_scope("LSTM") as scope:
self.cell = rnn_cell.BasicLSTMCell(self.rnn_size)
self.stacked_cell = rnn_cell.MultiRNNCell([self.cell] * self.layer_depth)
outputs, _ = rnn.rnn(self.stacked_cell,
self.cnn_outputs,
dtype=tf.float32)
self.lstm_outputs = []
self.true_outputs = tf.placeholder(tf.float32,
[self.batch_size, self.seq_length, self.word_vocab_size])
loss = 0
true_outputs = tf.split(1, self.seq_length, self.true_outputs)
for idx, (top_h, true_output) in enumerate(zip(outputs, true_outputs)):
if self.dropout_prob > 0:
top_h = tf.nn.dropout(top_h, self.dropout_prob)
if self.hsm > 0:
self.lstm_outputs.append(top_h)
else:
if idx != 0:
scope.reuse_variables()
proj = rnn_cell.linear(top_h, self.word_vocab_size, 0)
log_softmax = tf.log(tf.nn.softmax(proj))
self.lstm_outputs.append(log_softmax)
loss += tf.nn.softmax_cross_entropy_with_logits(self.lstm_outputs[idx],
tf.squeeze(true_output))
self.loss = tf.reduce_mean(loss) / self.seq_length
tf.scalar_summary("loss", self.loss)
tf.scalar_summary("perplexity", tf.exp(self.loss))
def __call__(self, inputs, state, scope=None):
"""Most basic RNN: output = new_state = tanh(W * input + U * state + B)."""
with vs.variable_scope(scope or type(self).__name__): # "BasicRNNCell"
output = tf.nn.relu(rnn_cell.linear([inputs, state], self._num_units, True))
return output, output
def build_model(self):
with tf.variable_scope('RNNTEST'):
self.sense = tf.placeholder(tf.int32,[None])
self.arg1 = tf.placeholder(tf.int32,[None,None,4])
self.arg2 = tf.placeholder(tf.int32,[None,None,4])
self.arg1_len = tf.placeholder(tf.int32,[None])
self.arg2_len = tf.placeholder(tf.int32,[None])
self.keep_prob = tf.placeholder(tf.float32)
arg1_list = tf.split(2,4,self.arg1)
arg2_list = tf.split(2,4,self.arg2)
with tf.device('/cpu:0'):
NER_W = tf.get_variable('NER_embed',[self.data_loader.NER_vocab_size,self.NER_embed_size]) if self.NER_embed_size>0 else None
lemma_W = tf.get_variable('lemma_embed',[self.data_loader.lemma_vocab_size,self.lemma_embed_size]) if self.lemma_embed_size>0 else None
if self.use_pre_trained_embedding:
word_W = tf.get_variable('word_embed',initializer = tf.convert_to_tensor(self.data_loader.pre_trained_word_embeddings,dtype=tf.float32)) if self.word_embed_size>0 else None
else:
word_W = tf.get_variable('word_embed',shape = [self.data_loader.word_vocab_size,self.word_embed_size]) if self.word_embed_size>0 else None
POS_W = tf.get_variable('POS_embed',[self.data_loader.POS_vocab_size,self.POS_embed_size]) if self.POS_embed_size>0 else None
arg1_embed_list = []
arg2_embed_list = []
for idx,W in enumerate([NER_W,lemma_W,word_W,POS_W]):
if W is not None:
arg1_embed_list.append(tf.nn.embedding_lookup(W,tf.squeeze(arg1_list[idx],[2])))
arg2_embed_list.append(tf.nn.embedding_lookup(W,tf.squeeze(arg2_list[idx],[2])))
arg1 = tf.nn.dropout(tf.concat(2,arg1_embed_list),self.keep_prob)
arg2 = tf.nn.dropout(tf.concat(2,arg2_embed_list),self.keep_prob)
encoder_lstm_unit = rnn_cell.BasicLSTMCell(self.encoder_size)
decoder_lstm_unit = rnn_cell.BasicLSTMCell(self.decoder_size)
with tf.variable_scope('forward_encoder'):
forward_encoder_outputs,forward_encoder_state = rnn.dynamic_rnn(encoder_lstm_unit,arg1,self.arg1_len,dtype=tf.float32)
with tf.variable_scope('backward_encoder'):
backward_encoder_outputs,backward_encoder_state= rnn.dynamic_rnn(encoder_lstm_unit,tf.reverse_sequence(arg1,tf.cast(self.arg1_len,tf.int64),1),dtype=tf.float32)
encoder_outputs = tf.concat(2,[forward_encoder_outputs,tf.reverse_sequence(backward_encoder_outputs,tf.cast(self.arg1_len,tf.int64),1)])
encoder_state = tf.concat(1,[forward_encoder_state,backward_encoder_state])
source = tf.expand_dims(encoder_outputs,2) #batch_size x source_len x 1 x source_depth(2*encoder_size)
attention_W = tf.get_variable('attention_W',[1,1,2*self.encoder_size,self.attention_judge_size])
attention_V = tf.get_variable('attention_V',[self.attention_judge_size])
WxH = tf.nn.conv2d(source, attention_W,[1,1,1,1],'SAME') #batch_size x source_len x 1 x attention
self.mask = tf.placeholder(tf.float32,[None,None])
def attention(input_t,output_t_minus_1,time):
with tf.variable_scope('attention'):
VxS = tf.reshape(rnn_cell.linear(output_t_minus_1,self.attention_judge_size,True),[-1,1,1,self.attention_judge_size]) #batch_size x 1 x 1 x attention
_exp = tf.exp(tf.reduce_sum( attention_V * tf.tanh(WxH+VxS), [3]))#batch_size x source_len x 1
_exp = _exp*tf.expand_dims(self.mask,-1)
attention_weight = _exp/tf.reduce_sum(_exp,[1], keep_dims=True)
attention_t = tf.reduce_sum(encoder_outputs*attention_weight,[1])
feed_in_t = tf.tanh(rnn_cell.linear([attention_t,input_t],self.embedding_size,True))
return feed_in_t
with tf.variable_scope('decoder'):
decoder_outputs,decoder_state = dynamic_rnn_decoder(arg2,decoder_lstm_unit,initial_state=encoder_state,sequence_length=self.arg2_len,loop_function=attention)
judge = tf.concat(1,[tf.reduce_sum(decoder_outputs,[1])/tf.expand_dims(tf.cast(self.arg2_len,tf.float32),-1),tf.reduce_sum(encoder_outputs,[1])/tf.expand_dims(tf.cast(self.arg1_len,tf.float32),-1)])
unscaled_log_distribution = rnn_cell.linear(judge,self.data_loader.sense_vocab_size,True)
self.output = tf.cast(tf.argmax(unscaled_log_distribution,1),tf.int32)
self.accuracy = tf.reduce_mean(tf.cast(tf.equal(self.output,self.sense), tf.float32))
#max-margin method
#self._MM = tf.placeholder(tf.int32,[None])
#margin = tf.sub(tf.reduce_max(unscaled_log_distribution,[1]),tf.gather(tf.reshape(unscaled_log_distribution,[-1]),self._MM))
#self.loss = tf.reduce_mean(margin)
#maximum likelihood method
self.loss = tf.reduce_mean(tf.nn.sparse_softmax_cross_entropy_with_logits(unscaled_log_distribution, self.sense))
self.optimizer = tf.train.AdagradOptimizer(self.lr)
self.train_op = self.optimizer.minimize(self.loss)
