def build_lstm_cell(inps, num_layers, num_units):
lstms = [LSTMCell(num_units, dtype=tf.float32) for _ in range(num_layers)]
multilayer_lstm = tf.contrib.rnn.MultiRNNCell(lstms)
zero_state = multilayer_lstm.zero_state(tf.shape(inps)[1], tf.float32)
logits, _ = tf.nn.dynamic_rnn(multilayer_lstm,
inps,
initial_state=zero_state,
parallel_iterations=1024,
time_major=True)
return logits
def cal_loss_logit(embedded, keep_prob, reuse=True, scope="loss"):
with tf.variable_scope(scope, reuse=tf.AUTO_REUSE) as scope:
rnn_outputs, _ = bi_rnn(LSTMCell(self.hidden_size),
LSTMCell(self.hidden_size),
inputs=embedded, dtype=tf.float32)
# Attention
H = tf.add(rnn_outputs[0], rnn_outputs[1]) # fw + bw
M = tf.tanh(H) # M = tanh(H) (batch_size, seq_len, HIDDEN_SIZE)
# alpha (bs * sl, 1)
alpha = tf.nn.softmax(tf.matmul(tf.reshape(M, [-1, self.hidden_size]),
tf.reshape(W, [-1, 1])))
r = tf.matmul(tf.transpose(H, [0, 2, 1]), tf.reshape(alpha, [-1, self.max_len,
1])) # supposed to be (batch_size * HIDDEN_SIZE, 1)
r = tf.squeeze(r)
h_star = tf.tanh(r)
drop = tf.nn.dropout(h_star, keep_prob)
# Fully connected layer（dense layer)
y_hat = tf.nn.xw_plus_b(drop, W_fc, b_fc,name='logits')
return y_hat, tf.reduce_mean(tf.nn.sparse_softmax_cross_entropy_with_logits(logits=y_hat, labels=self.label))
def add_cell_lstm(inps, state, num_units, input_dim, init_parameter):
stddevs = compute_stddevs(num_units, input_dim, init_parameter)
lstms = [
LSTMCell(nu,
dtype=tf.float32,
state_is_tuple=False,
initializer=tf.truncated_normal_initializer(stddev=stddev))
for nu, stddev in zip(num_units, stddevs)
]
multilayer_lstm = tf.contrib.rnn.MultiRNNCell(lstms, state_is_tuple=False)
# print("(add_cell_lstm)state:", state)
# print("(add_cell_lstm)multilayer_lstm.state_size:", multilayer_lstm.state_size)
state = prepare_init_state(state, inps, multilayer_lstm, 'cell')
if state is None:
state = multilayer_lstm.zero_state(tf.shape(inps)[1], tf.float32)
# print("(add_cell_lstm)multilayer_lstm.state:", multilayer_lstm.state)
output, state = tf.nn.dynamic_rnn(multilayer_lstm,
inps,
initial_state=state,
parallel_iterations=1024,
time_major=True)
return output, state
def _create_model(self, mode, input_ids, input_mask, segment_ids, labels,
slot_labels, labels_mask, drop_keep_prob,
entity_type_ids, sequence_lengths):
"""Creates a LaserTagger model."""
is_training = (mode == tf.estimator.ModeKeys.TRAIN)
model = modeling.BertModel(
config=self._config,
is_training=is_training,
input_ids=input_ids,
input_mask=input_mask,
token_type_ids=segment_ids,
use_one_hot_embeddings=self._use_one_hot_embeddings)
final_layer = model.get_sequence_output()
# final_hidden = model.get_pooled_output()
if is_training:
# I.e., 0.1 dropout
# final_hidden = tf.nn.dropout(final_hidden, keep_prob=drop_keep_prob)
final_layer = tf.nn.dropout(final_layer, keep_prob=drop_keep_prob)
# 结合实体信息
batch_size, seq_length = modeling.get_shape_list(input_ids)
self.entity_type_embedding = tf.get_variable(
name="entity_type_embedding",
shape=(self.entity_type_num, self._config.hidden_size),
dtype=tf.float32,
trainable=True,
initializer=tf.random_uniform_initializer(
-self._config.initializer_range * 100,
self._config.initializer_range * 100,
seed=20))
with tf.init_scope():
impact_weight_init = tf.constant(1.0 / self.entity_type_num,
dtype=tf.float32,
shape=(1, self.entity_type_num))
self.impact_weight = tf.Variable(impact_weight_init,
dtype=tf.float32,
name="impact_weight") # 不同类型的影响权重
impact_weight_matrix = tf.tile(self.impact_weight,
multiples=[batch_size * seq_length, 1])
entity_type_ids_matrix1 = tf.cast(tf.reshape(
entity_type_ids, [batch_size * seq_length, self.entity_type_num]),
dtype=tf.float32)
entity_type_ids_matrix = tf.multiply(entity_type_ids_matrix1,
impact_weight_matrix)
entity_type_emb = tf.matmul(entity_type_ids_matrix,
self.entity_type_embedding)
final_layer = final_layer + tf.reshape(entity_type_emb, [
batch_size, seq_length, self._config.hidden_size
]) # TODO TODO # 0.7071067811865476是二分之根号二
# final_layer = tf.concat([final_layer, tf.reshape(entity_type_emb, [batch_size, seq_length,self._config.hidden_size])], axis=-1)
if is_training:
final_layer = tf.nn.dropout(final_layer, keep_prob=drop_keep_prob)
(output_fw_seq,
output_bw_seq), ((c_fw, h_fw),
(c_bw, h_bw)) = tf.nn.bidirectional_dynamic_rnn(
cell_fw=LSTMCell(self.lstm_hidden_size),
cell_bw=LSTMCell(self.lstm_hidden_size),
inputs=final_layer,
sequence_length=sequence_lengths,
dtype=tf.float32)
layer_matrix = tf.concat([output_fw_seq, output_bw_seq], axis=-1)
final_hidden = tf.concat([c_fw, c_bw], axis=-1)
layer_matrix = tf.contrib.layers.layer_norm(inputs=layer_matrix,
begin_norm_axis=-1,
begin_params_axis=-1)
intent_logits = tf.layers.dense(
final_hidden,
self._num_tags,
kernel_initializer=tf.truncated_normal_initializer(stddev=0.02),
name="output_projection")
slot_logits = tf.layers.dense(
layer_matrix,
self.num_slot_tags,
kernel_initializer=tf.truncated_normal_initializer(stddev=0.02),
name="slot_projection")
with tf.variable_scope("loss"):
loss = None
per_example_intent_loss = None
per_example_slot_loss = None
if mode != tf.estimator.ModeKeys.PREDICT:
per_example_intent_loss = tf.nn.sparse_softmax_cross_entropy_with_logits(
labels=labels, logits=intent_logits)
slot_loss = tf.nn.sparse_softmax_cross_entropy_with_logits(
labels=slot_labels, logits=slot_logits)
per_example_slot_loss = tf.truediv(
tf.reduce_sum(slot_loss, axis=1),
tf.cast(tf.reduce_sum(labels_mask, axis=1), tf.float32))
# from tensorflow.contrib.crf import crf_log_likelihood
# from tensorflow.contrib.crf import viterbi_decode
# batch_size = tf.shape(slot_logits)[0]
# print(curLine(), batch_size, tf.constant([self._max_seq_length]))
# length_batch = tf.tile(tf.constant([self._max_seq_length]), [batch_size])
# print(curLine(), batch_size, "length_batch:", length_batch)
# per_example_slot_loss, self.transition_params = crf_log_likelihood(inputs=slot_logits,
# tag_indices=slot_labels,sequence_lengths=length_batch)
# print(curLine(), "per_example_slot_loss:", per_example_slot_loss) # shape=(batch_size,)
# print(curLine(), "self.transition_params:", self.transition_params) # shape=(9, 9)
loss = tf.reduce_mean(self.intent_ratio *
per_example_intent_loss +
self.slot_ratio * per_example_slot_loss)
pred_intent = tf.cast(tf.argmax(intent_logits, axis=-1), tf.int32)
pred_slot = tf.cast(tf.argmax(slot_logits, axis=-1), tf.int32)
return (loss, per_example_slot_loss, pred_intent, pred_slot,
batch_size, entity_type_emb, impact_weight_matrix,
entity_type_ids_matrix, final_layer, slot_logits)
with tf.name_scope('Embedding Layer'):
embedding = tf.Variable(tf.random_uniform([vocabulary_size, embed_size], -1, 1))
embeded = tf.nn.embedding_lookup(embedding, batch_ph)
tf.summary.histogram('embedding', embedding)
'''
##RNN layers
lstm_size = 32
lstm_layers = 3
output = batch_ph
for i in range(lstm_layers):
with tf.variable_scope('BiLSTM_Layer_{}'.format(i)):
lstm_fw = LSTMCell(
lstm_size
) #, initializer=tf.truncated_normal_initializer(-0.1, 0.1, seed=2)
lstm_bw = LSTMCell(lstm_size)
cell_fw = tf.contrib.rnn.DropoutWrapper(
lstm_fw, output_keep_prob=keep_prob_ph_rnn)
cell_bw = tf.contrib.rnn.DropoutWrapper(
lstm_bw, output_keep_prob=keep_prob_ph_rnn)
(output_fw, output_bw), final_state = BiRNN(cell_fw,
cell_bw,
output,
dtype=tf.float32)
output = tf.concat((output_fw, output_bw), 2)
##Attention + Dropout
with tf.variable_scope('BiLSTM_Layer_{}'.format(lstm_layers)):
def build_graph(self):
""" Build the main architecture of the graph. """
random.seed(310)
tf.set_random_seed(902)
print("building graph")
with tf.variable_scope('model', reuse=self.reuse):
### Lookup ELMo Embedding ###
self.x_elmo = layers.Lambda(
lambda inputs: ElmoEmbedding(inputs, elmo_model),
output_shape=(1024, ))(self.x_elmo_input)
shape = tf.shape(self.x_elmo)
self.shape = shape
# self.glove = tf.Variable(tf.random_uniform([tf.shape(self.glove)[0], self.embed_dimensions], -1.0, 1.0),trainable=True)
if self.glove_include:
### Lookup Glove Vectors ###
batch_embedded = tf.nn.embedding_lookup(self.glove, self.x)
batch_embedded = batch_embedded[:, -shape[1]:, :]
### Include POS ###
if self.pos_include:
### POS-TAG Embedding ###
embeddings_var = tf.Variable(tf.random_uniform(
[12, self.pos_dimensions], -1.0, 1.0),
trainable=True)
self.pos_embedding = tf.nn.embedding_lookup(
embeddings_var, self.pos)
self.pos_embedded = self.pos_embedding[:, -shape[1]:, :]
batch_embedded = tf.concat(
[batch_embedded, self.pos_embedded], axis=2)
if self.layer_1_include:
hid = 2 * self.hidden_size
if self.layer_1 == 'lstm':
rnn_outputs, _ = bi_rnn(
LSTMCell(self.hidden_size,
use_peepholes=self.peephole_1),
LSTMCell(self.hidden_size,
use_peepholes=self.peephole_2),
inputs=batch_embedded,
dtype=tf.float32,
scope='rnn_1')
fw_outputs, bw_outputs = rnn_outputs
layer = tf.concat([fw_outputs, bw_outputs], axis=2)
elif self.layer_1 == 'gru':
rnn_outputs, _ = bi_rnn(GRUCell(self.hidden_size),
GRUCell(self.hidden_size),
inputs=batch_embedded,
dtype=tf.float32,
scope='rnn_1')
fw_outputs, bw_outputs = rnn_outputs
layer = tf.concat([fw_outputs, bw_outputs], axis=2)
else:
conv_layer = tf.layers.conv1d(
inputs=batch_embedded,
filters=self.hidden_size * 2,
kernel_size=self.kernel_size,
strides=1,
padding="same",
activation=tf.nn.relu)
layer = conv_layer
else:
layer = batch_embedded
hid = self.hidden_size
if self.pos_include:
hid += self.pos_dimensions
print(self.hidden_size)
# FLAGS Including ELMO and Glove
if self.glove_include and self.elmo:
H_1 = tf.concat([layer, self.x_elmo], axis=2)
hid += 1024
elif self.glove_include:
H_1 = layer
elif self.elmo:
H_1 = self.x_elmo
hid = 1024
if self.layer_2 == 'lstm':
rnn_outputs_2, _ = bi_rnn(
LSTMCell(hid, use_peepholes=self.peephole_3),
LSTMCell(hid, use_peepholes=self.peephole_4),
inputs=H_1,
dtype=tf.float32,
scope='rnn_2')
fw_outputs_2, bw_outputs_2 = rnn_outputs_2
H = tf.concat([fw_outputs_2, bw_outputs_2], axis=2)
elif self.layer_2 == 'gru':
rnn_outputs_2, _ = bi_rnn(GRUCell(hid),
GRUCell(hid),
inputs=H_1,
dtype=tf.float32,
scope='rnn_2')
fw_outputs_2, bw_outputs_2 = rnn_outputs_2
H = tf.concat([fw_outputs_2, bw_outputs_2], axis=2)
elif self.layer_2 == 'conv':
conv_layer = tf.layers.conv1d(inputs=H_1,
filters=hid,
kernel_size=self.kernel_size,
strides=1,
padding="same",
activation=tf.nn.relu)
H = conv_layer
hid = tf.cast(hid / 2, tf.int32)
else:
H = H_1
hid = tf.cast(hid / 2, tf.int32)
hid *= 2
### Ask whether there is a sequence with length 0 ###
condition = tf.equal(tf.reduce_min(self.seq_len), 0)
### FLAG Including attention ###
if self.attention:
with tf.variable_scope('attention', reuse=self.reuse):
M = tf.tanh(
H) # M = tanh(H) (batch_size, seq_len, HIDDEN_SIZE)
dropout_layer_attention = tf.layers.dropout(
inputs=tf.reshape(M, [-1, hid]),
rate=self.attention_prob,
training=self.is_training,
seed=847)
self.dense = tf.layers.dense(
inputs=dropout_layer_attention,
units=self.num_attention,
use_bias=False)
### Pool - Max or Mean ###
if self.pool_mean:
self.pool = tf.reduce_mean(self.dense, axis=1)
else:
self.pool = tf.reduce_max(self.dense, axis=1)
### Setting for stride 2 ###
#self.alpha = tf.exp(tf.reshape(self.pool,
# [-1, tf.cast(tf.round(tf.add(tf.div(tf.cast(shape[1], dtype = tf.float32), 2.0), 0.1)),
# dtype = tf.int32)]))
self.alpha = tf.exp(tf.reshape(self.pool, [-1, shape[1]]))
### Masking the sequences ###
if self.mask:
with tf.variable_scope('mask', reuse=self.reuse):
self.alpha = tf.reverse(self.alpha, axis=[1])
mask = tf.sequence_mask(self.seq_len)
mask = tf.to_float(mask)
self.alpha = tf.cond(condition, lambda: self.alpha,
lambda: self.alpha * mask)
self.alpha = tf.reverse(self.alpha, axis=[1])
#### Softmax ####
self.alpha = self.alpha / tf.expand_dims(
tf.reduce_sum(self.alpha, axis=1), 1)
### Derive the word with the highest attention ###
pos = tf.argmax(self.alpha, axis=1)
sparse_tensor = tf.string_split(self.x_elmo_input)
dense_tensor = tf.sparse_tensor_to_dense(sparse_tensor, '')
rg = tf.range(0, shape[0])
indices = tf.transpose([rg, tf.cast(pos, tf.int32)],
[1, 0])
self.best_example = tf.gather_nd(dense_tensor, indices)
### Computing weighted average ###
# r = tf.matmul(tf.transpose(H, [0, 2, 1]), tf.reshape(self.alpha,
# [-1, tf.cast(tf.round(tf.add(
# tf.div(tf.cast(shape[1], dtype=tf.float32),
# 2.0), 0.1)),
# dtype=tf.int32), 1]))
r = tf.matmul(tf.transpose(H, [0, 2, 1]),
tf.reshape(self.alpha, [-1, shape[1], 1]))
r = tf.squeeze(r, axis=2)
else:
with tf.variable_scope('rnn_average', reuse=self.reuse):
### Take a simple mean of all the words (INCLUDING padding) ###
### Masking the sequences ###
if self.mask:
with tf.variable_scope('mask', reuse=self.reuse):
self.alpha = tf.cond(
condition,
lambda: tf.tile(tf.expand_dims(shape[1], 0),
tf.expand_dims(shape[0], 0)),
lambda: self.seq_len)
self.alpha = tf.reciprocal(tf.to_float(self.alpha))
self.alpha = tf.tile(tf.expand_dims(self.alpha, 1),
[1, shape[1]])
self.alpha = tf.reverse(self.alpha, axis=[1])
mask = tf.sequence_mask(self.seq_len)
mask = tf.to_float(mask)
self.alpha = tf.cond(condition, lambda: self.alpha,
lambda: self.alpha * mask)
self.alpha = tf.reverse(self.alpha, axis=[1])
else:
self.alpha = tf.tile(tf.expand_dims(shape[1], 0),
tf.expand_dims(shape[0], 0))
self.alpha = tf.reciprocal(tf.to_float(self.alpha))
self.alpha = tf.tile(tf.expand_dims(self.alpha, 1),
[1, shape[1]])
### Necessarily here but serves no purpose - Derive the word with the highest attention ###
pos = tf.argmax(self.alpha, axis=1)
sparse_tensor = tf.string_split(self.x_elmo_input)
dense_tensor = tf.sparse_tensor_to_dense(sparse_tensor, '')
rg = tf.range(0, shape[0])
indices = tf.transpose([rg, tf.cast(pos, tf.int32)],
[1, 0])
self.best_example = tf.gather_nd(dense_tensor, indices)
### Computing average ###
r = tf.matmul(tf.transpose(H, [0, 2, 1]),
tf.reshape(self.alpha, [-1, shape[1], 1]))
r = tf.squeeze(r, axis=2)
self.h_star = tf.tanh(r) # (batch , HIDDEN_SIZE)
def _build_forward(self):
config = self.config
N, M, JX, JQ, VW, VC, d, W = \
config.batch_size, config.max_num_sents, config.max_sent_size, \
config.max_ques_size, config.word_vocab_size, config.char_vocab_size, config.hidden_size, \
config.max_word_size
JX = tf.shape(self.x)[2]
JQ = tf.shape(self.q)[1]
M = tf.shape(self.x)[1]
dc, dw, dco = config.char_emb_size, config.word_emb_size, config.char_out_size
with tf.variable_scope("emb"):
if config.use_char_emb:
with tf.variable_scope("emb_var"), tf.device("/cpu:0"):
char_emb_mat = tf.get_variable("char_emb_mat",
shape=[VC, dc],
dtype='float')
with tf.variable_scope("char"):
Acx = tf.nn.embedding_lookup(char_emb_mat,
self.cx) # [N, M, JX, W, dc]
Acq = tf.nn.embedding_lookup(char_emb_mat,
self.cq) # [N, JQ, W, dc]
Acx = tf.reshape(Acx, [-1, JX, W, dc])
Acq = tf.reshape(Acq, [-1, JQ, W, dc])
filter_sizes = list(
map(int, config.out_channel_dims.split(',')))
heights = list(map(int, config.filter_heights.split(',')))
assert sum(filter_sizes) == dco, (filter_sizes, dco)
with tf.variable_scope("conv"):
xx = multi_conv1d(Acx,
filter_sizes,
heights,
"VALID",
self.is_train,
config.keep_prob,
scope="xx")
if config.share_cnn_weights:
tf.get_variable_scope().reuse_variables()
qq = multi_conv1d(Acq,
filter_sizes,
heights,
"VALID",
self.is_train,
config.keep_prob,
scope="xx")
else:
qq = multi_conv1d(Acq,
filter_sizes,
heights,
"VALID",
self.is_train,
config.keep_prob,
scope="qq")
xx = tf.reshape(xx, [-1, M, JX, dco])
qq = tf.reshape(qq, [-1, JQ, dco])
if config.use_word_emb:
with tf.variable_scope("emb_var"), tf.device("/cpu:0"):
if config.mode == 'train':
word_emb_mat = tf.get_variable(
"word_emb_mat",
dtype='float',
shape=[VW, dw],
initializer=tf.random_normal_initializer)
else:
word_emb_mat = tf.get_variable("word_emb_mat",
shape=[VW, dw],
dtype='float')
if config.use_glove_for_unk:
word_emb_mat = tf.concat(
axis=0, values=[word_emb_mat, self.new_emb_mat])
with tf.name_scope("word"):
Ax = tf.nn.embedding_lookup(word_emb_mat,
self.x) # [N, M, JX, d]
Aq = tf.nn.embedding_lookup(word_emb_mat,
self.q) # [N, JQ, d]
self.tensor_dict['x'] = Ax
self.tensor_dict['q'] = Aq
if config.use_char_emb:
xx = tf.concat(axis=3, values=[xx, Ax]) # [N, M, JX, di]
qq = tf.concat(axis=2, values=[qq, Aq]) # [N, JQ, di]
else:
xx = Ax
qq = Aq
# highway network
if config.highway:
with tf.variable_scope("highway"):
xx = highway_network(xx,
config.highway_num_layers,
True,
wd=config.wd,
is_train=self.is_train)
tf.get_variable_scope().reuse_variables()
qq = highway_network(qq,
config.highway_num_layers,
True,
wd=config.wd,
is_train=self.is_train)
self.tensor_dict['xx'] = xx
self.tensor_dict['qq'] = qq
cell_fw = LSTMCell(d, state_is_tuple=True, name="basic_lstm_cell")
cell_bw = LSTMCell(d, state_is_tuple=True, name="basic_lstm_cell")
d_cell_fw = SwitchableDropoutWrapper(
cell_fw, self.is_train, input_keep_prob=config.input_keep_prob)
d_cell_bw = SwitchableDropoutWrapper(
cell_bw, self.is_train, input_keep_prob=config.input_keep_prob)
cell2_fw = LSTMCell(d, state_is_tuple=True, name="basic_lstm_cell")
cell2_bw = LSTMCell(d, state_is_tuple=True, name="basic_lstm_cell")
d_cell2_fw = SwitchableDropoutWrapper(
cell2_fw, self.is_train, input_keep_prob=config.input_keep_prob)
d_cell2_bw = SwitchableDropoutWrapper(
cell2_bw, self.is_train, input_keep_prob=config.input_keep_prob)
cell3_fw = LSTMCell(d, state_is_tuple=True, name="basic_lstm_cell")
cell3_bw = LSTMCell(d, state_is_tuple=True, name="basic_lstm_cell")
d_cell3_fw = SwitchableDropoutWrapper(
cell3_fw, self.is_train, input_keep_prob=config.input_keep_prob)
d_cell3_bw = SwitchableDropoutWrapper(
cell3_bw, self.is_train, input_keep_prob=config.input_keep_prob)
cell4_fw = LSTMCell(d, state_is_tuple=True, name="basic_lstm_cell")
cell4_bw = LSTMCell(d, state_is_tuple=True, name="basic_lstm_cell")
d_cell4_fw = SwitchableDropoutWrapper(
cell4_fw, self.is_train, input_keep_prob=config.input_keep_prob)
d_cell4_bw = SwitchableDropoutWrapper(
cell4_bw, self.is_train, input_keep_prob=config.input_keep_prob)
x_len = tf.reduce_sum(tf.cast(self.x_mask, 'int32'), 2) # [N, M]
q_len = tf.reduce_sum(tf.cast(self.q_mask, 'int32'), 1) # [N]
with tf.variable_scope("prepro"):
(fw_u, bw_u), ((_, fw_u_f), (_,
bw_u_f)) = bidirectional_dynamic_rnn(
d_cell_fw,
d_cell_bw,
qq,
q_len,
dtype='float',
scope='u1') # [N, J, d], [N, d]
u = tf.concat(axis=2, values=[fw_u, bw_u])
if config.share_lstm_weights:
tf.get_variable_scope().reuse_variables()
(fw_h, bw_h), _ = bidirectional_dynamic_rnn(
cell_fw, cell_bw, xx, x_len, dtype='float',
scope='u1') # [N, M, JX, 2d]
h = tf.concat(axis=3, values=[fw_h, bw_h]) # [N, M, JX, 2d]
else:
(fw_h, bw_h), _ = bidirectional_dynamic_rnn(
cell_fw, cell_bw, xx, x_len, dtype='float',
scope='h1') # [N, M, JX, 2d]
h = tf.concat(axis=3, values=[fw_h, bw_h]) # [N, M, JX, 2d]
self.tensor_dict['u'] = u
self.tensor_dict['h'] = h
with tf.variable_scope("main"):
if config.dynamic_att:
p0 = h
u = tf.reshape(tf.tile(tf.expand_dims(u, 1), [1, M, 1, 1]),
[N * M, JQ, 2 * d])
q_mask = tf.reshape(
tf.tile(tf.expand_dims(self.q_mask, 1), [1, M, 1]),
[N * M, JQ])
first_cell_fw = AttentionCell(
cell2_fw,
u,
mask=q_mask,
mapper='sim',
input_keep_prob=self.config.input_keep_prob,
is_train=self.is_train)
first_cell_bw = AttentionCell(
cell2_bw,
u,
mask=q_mask,
mapper='sim',
input_keep_prob=self.config.input_keep_prob,
is_train=self.is_train)
second_cell_fw = AttentionCell(
cell3_fw,
u,
mask=q_mask,
mapper='sim',
input_keep_prob=self.config.input_keep_prob,
is_train=self.is_train)
second_cell_bw = AttentionCell(
cell3_bw,
u,
mask=q_mask,
mapper='sim',
input_keep_prob=self.config.input_keep_prob,
is_train=self.is_train)
else:
p0 = attention_layer(config,
self.is_train,
h,
u,
h_mask=self.x_mask,
u_mask=self.q_mask,
scope="p0",
tensor_dict=self.tensor_dict)
first_cell_fw = d_cell2_fw
second_cell_fw = d_cell3_fw
first_cell_bw = d_cell2_bw
second_cell_bw = d_cell3_bw
(fw_g0, bw_g0), _ = bidirectional_dynamic_rnn(
first_cell_fw,
first_cell_bw,
p0,
x_len,
dtype='float',
scope='g0') # [N, M, JX, 2d]
g0 = tf.concat(axis=3, values=[fw_g0, bw_g0])
(fw_g1, bw_g1), _ = bidirectional_dynamic_rnn(
second_cell_fw,
second_cell_bw,
g0,
x_len,
dtype='float',
scope='g1') # [N, M, JX, 2d]
g1 = tf.concat(axis=3, values=[fw_g1, bw_g1])
logits = get_logits([g1, p0],
d,
True,
wd=config.wd,
input_keep_prob=config.input_keep_prob,
mask=self.x_mask,
is_train=self.is_train,
func=config.answer_func,
scope='logits1')
a1i = softsel(tf.reshape(g1, [N, M * JX, 2 * d]),
tf.reshape(logits, [N, M * JX]))
a1i = tf.tile(tf.expand_dims(tf.expand_dims(a1i, 1), 1),
[1, M, JX, 1])
(fw_g2, bw_g2), _ = bidirectional_dynamic_rnn(
d_cell4_fw,
d_cell4_bw,
tf.concat(axis=3, values=[p0, g1, a1i, g1 * a1i]),
x_len,
dtype='float',
scope='g2') # [N, M, JX, 2d]
g2 = tf.concat(axis=3, values=[fw_g2, bw_g2])
logits2 = get_logits([g2, p0],
d,
True,
wd=config.wd,
input_keep_prob=config.input_keep_prob,
mask=self.x_mask,
is_train=self.is_train,
func=config.answer_func,
scope='logits2')
flat_logits = tf.reshape(logits, [-1, M * JX])
flat_yp = tf.nn.softmax(flat_logits) # [-1, M*JX]
flat_logits2 = tf.reshape(logits2, [-1, M * JX])
flat_yp2 = tf.nn.softmax(flat_logits2)
if config.na:
na_bias = tf.get_variable("na_bias", shape=[], dtype='float')
na_bias_tiled = tf.tile(tf.reshape(na_bias, [1, 1]),
[N, 1]) # [N, 1]
concat_flat_logits = tf.concat(
axis=1, values=[na_bias_tiled, flat_logits])
concat_flat_yp = tf.nn.softmax(concat_flat_logits)
na_prob = tf.squeeze(tf.slice(concat_flat_yp, [0, 0], [-1, 1]),
[1])
flat_yp = tf.slice(concat_flat_yp, [0, 1], [-1, -1])
concat_flat_logits2 = tf.concat(
axis=1, values=[na_bias_tiled, flat_logits2])
concat_flat_yp2 = tf.nn.softmax(concat_flat_logits2)
na_prob2 = tf.squeeze(
tf.slice(concat_flat_yp2, [0, 0], [-1, 1]), [1]) # [N]
flat_yp2 = tf.slice(concat_flat_yp2, [0, 1], [-1, -1])
self.concat_logits = concat_flat_logits
self.concat_logits2 = concat_flat_logits2
self.na_prob = na_prob * na_prob2
yp = tf.reshape(flat_yp, [-1, M, JX], name="yp")
yp2 = tf.reshape(flat_yp2, [-1, M, JX], name="yp2")
wyp = tf.nn.sigmoid(logits2, name="wyp")
self.tensor_dict['g1'] = g1
self.tensor_dict['g2'] = g2
self.logits = flat_logits
self.logits2 = flat_logits2
self.yp = yp
self.yp2 = yp2
self.wyp = wyp
dtype=tf.int32,
name='encoder_inputs_length')
decoder_targets = tf.placeholder(shape=(None, None),
dtype=tf.int32,
name='decoder_targets')
embeddings = tf.get_variable('embedding',
shape=(vocab_size, input_embedding_size),
dtype=tf.float32,
initializer=tf.initializers.random_uniform(
-1.0, 1.0))
encoder_inputs_embedded = tf.nn.embedding_lookup(embeddings, encoder_inputs)
# encoder
encoder_cell = LSTMCell(encoder_hidden_units)
(encoder_fw_outputs, encoder_bw_outputs), (
encoder_fw_final_state,
encoder_bw_final_state) = tf.nn.bidirectional_dynamic_rnn(
cell_fw=encoder_cell,
cell_bw=encoder_cell,
inputs=encoder_inputs_embedded,
sequence_length=encoder_inputs_length,
dtype=tf.float32,
time_major=True)
# 融合双向 LSTM 的状态
encoder_outputs = tf.concat((encoder_fw_outputs, encoder_bw_outputs), axis=2)
encoder_final_state_c = tf.concat(
(encoder_fw_final_state.c, encoder_bw_final_state.c), axis=1)
encoder_final_state_h = tf.concat(
# y=tf.unstack(y)
# tf.reset_default_graph()
encode_input = tf.placeholder(shape=[None, None],
dtype=tf.int32,
name='encode_input')
decode_target = tf.placeholder(shape=[None, None],
dtype=tf.int32,
name='encode_input')
decode_input = tf.placeholder(shape=[None, None],
dtype=tf.int32,
name='encode_input')
embedding = tf.Variable(tf.random_uniform([4, 10], -1.0, 1.0),
dtype=tf.float32) #生成词汇表，前面是字符数量，后面是词嵌入大小
encode_embedding = tf.nn.embedding_lookup(embedding, encode_input)
decode_embedding = tf.nn.embedding_lookup(embedding, decode_input)
lstm_cell = LSTMCell(4)
outputs, states = dynamic_rnn(lstm_cell, encode_embedding, dtype=tf.float32)
print('states is ', states)
# y=tf.unstack(y,4,1)/
lstm_cell2 = LSTMCell(num_units=4)
logit, states2 = dynamic_rnn(lstm_cell2,
decode_embedding,
dtype=tf.float32,
initial_state=states,
scope='decode_output')
print('2')
la = tf.one_hot(y_target, depth=4, dtype=tf.float32)
print(la)
pre = tf.nn.softmax(logit)
print('logit is ', logit)
def _build_lm_graph(hparams, inputs, mode, freeze_bdlm=False, scope=None):
ids, lens, seq_in, phyche, seq_out = inputs
seq_dense = tf.layers.dense(inputs=seq_in,
units=25,
use_bias=False,
trainable=not freeze_bdlm,
name="bdlm_seq_dense")
x = tf.concat([seq_dense, phyche], axis=-1)
_outputs = []
with tf.variable_scope(scope or "bdlm_cnn_embed",
dtype=tf.float32) as cnn_scope:
cnn_embed = tf.layers.Conv1D(filters=hparams.num_filters,
kernel_size=hparams.filter_size,
activation=tf.nn.relu,
kernel_regularizer=lambda inp: hparams
.l2_lambda * tf.nn.l2_loss(inp),
trainable=not freeze_bdlm)
embed_proj = tf.layers.Dense(units=hparams.num_units,
kernel_regularizer=lambda inp: hparams
.l2_lambda * tf.nn.l2_loss(inp),
trainable=not freeze_bdlm)
z_0 = tf.layers.dropout(
inputs=cnn_embed(x),
rate=hparams.dropout,
training=mode == tf.contrib.learn.ModeKeys.TRAIN)
z_0 = embed_proj(z_0)
_outputs.append([z_0, z_0])
with tf.variable_scope(scope or "bdlm_rnn",
dtype=tf.float32) as bdlm_scope:
_get_cell = lambda name: LSTMCell(name=name,
num_units=hparams.num_lm_units,
num_proj=hparams.num_units,
trainable=not freeze_bdlm)
_drop_wrap = lambda cell: tf.nn.rnn_cell.DropoutWrapper(
cell=cell,
state_keep_prob=1.0 - hparams.recurrent_state_dropout
if mode == tf.contrib.learn.ModeKeys.TRAIN else 1.0,
input_keep_prob=1.0 - hparams.recurrent_input_dropout
if mode == tf.contrib.learn.ModeKeys.TRAIN else 1.0,
variational_recurrent=True,
input_size=tf.TensorShape([1]),
dtype=tf.float32)
fw_cells = []
bw_cells = []
# keep track of unwrapped cells so we can get their weights later
unwrapped_fw_cells = []
unwrapped_bw_cells = []
for i in range(hparams.num_lm_layers):
fw_cell = _get_cell("lstm_fw_%d" % (i))
bw_cell = _get_cell("lstm_bw_%d" % (i))
unwrapped_fw_cells.append(fw_cell)
unwrapped_bw_cells.append(bw_cell)
fw_cell = _drop_wrap(fw_cell)
bw_cell = _drop_wrap(bw_cell)
# create a residual connection around 1st layer
if i == 0:
fw_cell = tf.nn.rnn_cell.ResidualWrapper(fw_cell)
bw_cell = tf.nn.rnn_cell.ResidualWrapper(bw_cell)
# split fw and bw between GPUs
if hparams.num_gpus == 2:
fw_dev = "/device:GPU:0"
bw_dev = "/device:GPU:1"
fw_cell = tf.nn.rnn_cell.DeviceWrapper(fw_cell, fw_dev)
bw_cell = tf.nn.rnn_cell.DeviceWrapper(bw_cell, bw_dev)
else:
fw_dev = "/device:GPU:0"
bw_dev = "/device:GPU:0"
fw_cells.append(fw_cell)
bw_cells.append(bw_cell)
# reverse the bw inputs, then reverse all _outputs after dynamic_rnn
_outputs[0][1] = tf.reverse_sequence(
_outputs[0][1],
seq_lengths=lens +
tf.constant(hparams.filter_size + 1, dtype=tf.int32),
seq_axis=1)
for i in range(hparams.num_lm_layers):
with tf.name_scope("bdlm_layer_%d" % (i)):
# get fw / bw _outputs for each layer
input_fw = _outputs[-1][0]
input_bw = _outputs[-1][1]
with tf.device(fw_dev):
output_fw, _ = tf.nn.dynamic_rnn(
cell=fw_cells[i],
inputs=input_fw,
sequence_length=lens +
tf.constant(hparams.filter_size + 1, dtype=tf.int32),
dtype=tf.float32)
# add weight reg
unwrapped_fw_cells[i].add_loss(
tf.multiply(hparams.l2_lambda,
tf.nn.l2_loss(
unwrapped_fw_cells[i].weights[0]),
name="fw_%d_l2w" % (i)))
with tf.device(bw_dev):
output_bw, _ = tf.nn.dynamic_rnn(
cell=bw_cells[i],
inputs=input_bw,
sequence_length=lens +
tf.constant(hparams.filter_size + 1, dtype=tf.int32),
dtype=tf.float32)
unwrapped_bw_cells[i].add_loss(
tf.multiply(hparams.l2_lambda,
tf.nn.l2_loss(
unwrapped_bw_cells[i].weights[0]),
name="bw_%d_l2w" % (i)))
_outputs.append([output_fw, output_bw])
outputs = []
for i in range(len(_outputs)):
# reverse the backward outputs; trim the extra steps from fw/bw and concat
_outputs[i][1] = tf.reverse_sequence(
_outputs[i][1],
seq_lengths=lens +
tf.constant(hparams.filter_size + 1, dtype=tf.int32),
seq_axis=1)
outputs.append(
tf.concat([
_outputs[i][0][:, :-(hparams.filter_size + 1), :],
_outputs[i][1][:, (hparams.filter_size + 1):, :]
],
axis=-1))
output_fw = outputs[-1][0]
output_bw = outputs[-1][1]
with tf.variable_scope("bdlm_out", dtype=tf.float32):
rnn_out = outputs[-1]
rnn_out = tf.layers.dropout(
inputs=rnn_out,
rate=hparams.dropout,
training=mode == tf.contrib.learn.ModeKeys.TRAIN)
logits = tf.layers.dense(inputs=rnn_out,
units=hparams.num_labels,
kernel_regularizer=lambda inp: hparams.
l2_lambda * tf.nn.l2_loss(inp),
trainable=not freeze_bdlm)
# mask out entries longer than target sequence length
mask = tf.sequence_mask(lens, dtype=tf.float32)
# add activity reg to last layer
with tf.name_scope("l2_act_reg"):
l2_act_loss = lambda act: tf.reduce_sum(
tf.reduce_sum(hparams.l2_alpha * tf.square(act) * tf.
expand_dims(mask, axis=-1),
axis=[1, 2]) / tf.cast(lens, tf.float32))
# ignore the loss contributed by time steps longer than sequence length
fw_act_loss = l2_act_loss(output_fw)
bw_act_loss = l2_act_loss(output_bw)
unwrapped_fw_cells[-1].add_loss(fw_act_loss, inputs=input_fw)
unwrapped_bw_cells[-1].add_loss(bw_act_loss, inputs=input_bw)
crossent = tf.nn.softmax_cross_entropy_with_logits_v2(logits=logits,
labels=seq_out,
name="crossent")
seq_loss = tf.reduce_sum(
tf.reduce_sum(crossent * mask, axis=1) / tf.cast(
lens, tf.float32)) / tf.cast(hparams.batch_size, tf.float32)
reg_loss = tf.add_n(tf.losses.get_regularization_losses(),
name="reg_loss")
if hparams.l2_alpha == 0. and hparams.l2_lambda == 0. and hparams.l2_beta == 0.:
loss = seq_loss
else:
loss = seq_loss + reg_loss
metrics = []
update_ops = []
if mode == tf.contrib.learn.ModeKeys.EVAL:
# mean eval loss
loss, loss_update = tf.metrics.mean(values=loss)
seq_loss, seq_loss_update = tf.metrics.mean(values=seq_loss)
tf.summary.scalar("eval_seq_loss", seq_loss, collections=["eval"])
reg_loss, reg_loss_update = tf.metrics.mean(values=reg_loss)
tf.summary.scalar("eval_reg_loss", reg_loss, collections=["eval"])
predictions = tf.argmax(input=logits, axis=-1)
tgt_labels = tf.argmax(input=seq_out, axis=-1)
acc, acc_update = tf.metrics.accuracy(predictions=predictions,
labels=tgt_labels,
weights=mask)
# final layer activations
#mean_act_fw, mean_act_fw_update = add_seq_activation_histogram(output_fw, lens, "fw_2")
#mean_act_bw, mean_act_bw_update = add_seq_activation_histogram(output_bw, lens, "bw_2")
# confusion matrix
targets_flat = tf.reshape(tgt_labels, [-1])
predictions_flat = tf.reshape(predictions, [-1])
mask_flat = tf.reshape(mask, [-1])
cm, cm_update = streaming_confusion_matrix(
labels=targets_flat,
predictions=predictions_flat,
num_classes=hparams.num_labels,
weights=mask_flat)
tf.add_to_collection("eval", cm_summary(cm, hparams.num_labels))
metrics = [acc, cm]
update_ops = [
loss_update, seq_loss_update, reg_loss_update, acc_update,
cm_update
] #, mean_act_fw_update, mean_act_bw_update]
return outputs, logits, loss, metrics, update_ops
def __init__(
self,
batch_size,
inputs,
outputs,
num_units,
cell_type
):
"""
Args:
num_hidden : number of hidden elements of each LSTM unit.
inputs : a list (tensor array) of input tensors with size hp.num_time_steps*(batch_size,dim)
cell : an rnn cell object (the default option is tf.python.ops.rnn_cell.LSTMCell)
reverse : Option to decode in reverse order
decode_without_input : Option to decode without input - there are zeros coming to the cell instead of input
"""
self.batch_size = batch_size
self.num_inputs = inputs[0].get_shape().as_list()[1]
self.num_outputs = self.num_inputs
num_time_steps = len(inputs)
num_hidden = num_units[-1]
self.last = inputs[-1]
if len(num_units) > 1:
cells = [LSTMCell(num_units=n) for n in num_units]
self._lstm_cell = MultiRNNCell(cells)
else:
self._lstm_cell = LSTMCell(num_hidden)
with tf.compat.v1.variable_scope('encoder') as ec:
Wy = tf.Variable(tf.random.truncated_normal([num_hidden,
self.num_outputs], dtype=tf.float32), name='enc_weight'
)
by = tf.Variable(tf.random.truncated_normal([self.num_outputs],
dtype=tf.float32), name='enc_bias')
init_states = []
for i in range(len(num_units)):
init_c = tf.zeros((batch_size, num_units[i]))
init_h = init_c
layer = tf.contrib.rnn.LSTMStateTuple(init_c, init_h)
init_states.append(layer)
init_states = tuple(init_states)
if len(num_units) > 1:
lstm_state = init_states
else:
lstm_state = init_states[0]
lstm_outputs = []
for step in range(len(inputs)):
if step > 0:
ec.reuse_variables()
lstm_input = inputs[step]
(lstm_output, lstm_state) = self._lstm_cell(
lstm_input, lstm_state)
for step in range(len(outputs)):
lstm_input = tf.matmul(lstm_output, Wy) + by
lstm_outputs.append(lstm_input)
(lstm_output, lstm_state) = self._lstm_cell(
lstm_input, lstm_state)
self.prediction = tf.transpose(
tf.stack(lstm_outputs), [1, 0, 2], name='prediction')
self.target = tf.transpose(
tf.stack(outputs), [1, 0, 2], name='target')
self.input_ = tf.transpose(tf.stack(inputs), [1, 0, 2])
self.prediction = self.prediction[:, :, 0]
self.target = self.target[:, :, 0]
self.enc_W = Wy
self.enc_b = by
def __init__(
self,
batch_size,
inputs,
outputs,
num_units,
cell_type
):
"""
Args:
inputs : a list (tensor array) of input tensors with size hp.num_time_steps*(batch_size,dim)
cell : an rnn cell object (the default option is tf.python.ops.rnn_cell.LSTMCell)
reverse : Option to decode in reverse order
decode_without_input : Option to decode without input - there are zeros coming to the cell instead of input
"""
self.batch_size = batch_size
self.num_inputs = inputs[0].get_shape().as_list()[1]
self.num_outputs = self.num_inputs
num_hidden = num_units[-1]
if len(num_units) > 1:
if cell_type == 'GRU':
cells = [GRUCell(num_units=n) for n in num_units]
else:
cells = [LSTMCell(num_units=n) for n in num_units]
self._enc_cell = MultiRNNCell(cells)
self._dec_cell = MultiRNNCell(cells)
else:
if cell_type == 'GRU':
self._enc_cell = GRUCell(num_hidden)
self._dec_cell = GRUCell(num_hidden)
else:
self._enc_cell = LSTMCell(num_hidden)
self._dec_cell = LSTMCell(num_hidden)
# , initializer=tf.contrib.layers.xavier_initializer()
with tf.compat.v1.variable_scope('encoder') as es:
enc_W = tf.Variable(tf.random.truncated_normal([num_hidden,
self.num_outputs], dtype=tf.float32), name='enc_weight'
)
enc_b = tf.Variable(tf.random.truncated_normal([self.num_outputs],
dtype=tf.float32), name='enc_bias')
init_states = []
if cell_type == 'GRU':
for i in range(len(num_units)):
layer = tf.zeros((batch_size, num_units[i]))
init_states.append(layer)
else:
# make the zero initial cell and hidden state as a tuple - in the shape LSTM cell expects it to be
for i in range(len(num_units)):
init_c = tf.zeros((batch_size, num_units[i]))
init_h = init_c
layer = tf.contrib.rnn.LSTMStateTuple(init_c, init_h)
init_states.append(layer)
init_states = tuple(init_states)
if len(num_units) > 1:
enc_state = init_states
else:
enc_state = init_states[0]
enc_predictions = []
for step in range(len(inputs)):
if step > 0:
es.reuse_variables()
enc_input = inputs[step]
(enc_output, enc_state) = self._enc_cell(
enc_input, enc_state) # lstm_output = hidden state, lstm_state = tuple(cell state, hidden state)
#y_hat = Wy*h + by
enc_prediction = tf.matmul(enc_output, enc_W) + enc_b
enc_predictions.append(enc_prediction)
with tf.compat.v1.variable_scope('decoder') as vs:
dec_W = tf.Variable(tf.random.truncated_normal([num_hidden,
self.num_outputs], dtype=tf.float32), name='dec_weight'
)
dec_b = tf.Variable(tf.random.truncated_normal([self.num_outputs],
dtype=tf.float32), name='dec_bias')
dec_input = enc_prediction
dec_state = enc_state
dec_outputs = []
for step in range(len(outputs)):
if step > 0:
vs.reuse_variables()
(dec_input, dec_state) = self._dec_cell(
dec_input, dec_state)
dec_input = tf.matmul(dec_input, dec_W) + dec_b
dec_outputs.append(dec_input)
self.prediction = tf.transpose(
tf.stack(dec_outputs), [1, 0, 2], name='prediction')
self.input_ = tf.transpose(tf.stack(inputs), [1, 0, 2])
self.target = tf.transpose(tf.stack(outputs), [1, 0, 2], name='target')
self.prediction = self.prediction[:, :, 0]
self.target = self.target[:, :, 0]
self.enc_W = enc_W
self.enc_b = enc_b
self.dec_W = dec_W
self.dec_b = dec_b
def _LSTMCells(unit_list, act_fn_list):
return MultiRNNCell([
LSTMCell(unit, activation=act_fn)
for unit, act_fn in zip(unit_list, act_fn_list)
])
output = embeded
'''
for i in range(lstm_layers):
with tf.variable_scope('BiLSTM_Layer_{}'.format(i)):
lstm_fw = LSTMCell(lstm_size) #, initializer=tf.truncated_normal_initializer(-0.1, 0.1, seed=2)
lstm_bw = LSTMCell(lstm_size)
cell_fw = tf.contrib.rnn.DropoutWrapper(lstm_fw, output_keep_prob=keep_prob_ph_rnn)
cell_bw = tf.contrib.rnn.DropoutWrapper(lstm_bw, output_keep_prob=keep_prob_ph_rnn)
(output_fw, output_bw), final_state = BiRNN(cell_fw, cell_bw, output, dtype=tf.float32)
output = tf.concat((output_fw, output_bw), 2)
'''
##Attention + Dropout
with tf.variable_scope('BiLSTM_Layer_{}'.format(lstm_layers)):
lstm_fw = LSTMCell(lstm_size)
lstm_bw = LSTMCell(lstm_size)
(output_fw, output_bw), final_state = BiRNN(lstm_fw,
lstm_bw,
output,
dtype=tf.float32)
output = tf.concat((output_fw, output_bw), 2)
attention = Attention(output)
drop = tf.nn.dropout(attention, keep_prob_ph)
tf.summary.histogram('RNN_output', output)
##FC layers
with tf.name_scope('Fully_connected_Layers_0'):
fc_output = tf.contrib.layers.fully_connected(drop,
64,
activation_fn=tf.nn.relu)