def __init__(self, input,embeddings,features,mini_batch_size=32,nhu=300,width=5,activation=hardtanh,seed=1234,n_out=9,name='SennaNER',params=None):
self.name = name
self.layers = []
self.input = input
self.output = None
embedding_dim=embeddings.shape[1]
features_dim = features.shape[1]
rng=np.random.RandomState(seed)
self.EmbeddingLayer = EmbeddingLayer(input=input[:,:,0],w_values=embeddings,embedding_dim=embedding_dim,mini_batch_size=mini_batch_size,width=width,params=params)
self.EmbeddingLayer = EmbeddingLayer(input=input[:,:,1],w_values=features,embedding_dim=features_dim,mini_batch_size=mini_batch_size,width=width)
self.HiddenLayer = DoubleInputHiddenLayer(input1=self.EmbeddingLayer.output, input2=self.StaticEmbeddingLayer.output, n_in1=embedding_dim*width, n_in2=features_dim*width, n_out=nhu, rng=rng, activation=activation,params=params)
self.LogisticRegressionLayer = LogisticRegressionLayer(input=self.HiddenLayer.output,n_in=nhu,n_out=n_out, rng=rng, params=params)
self.layers=[self.EmbeddingLayer,self.StaticEmbeddingLayer,self.HiddenLayer,self.LogisticRegressionLayer]
self.L1 = T.sum([layer.L1 for layer in self.layers if "L1" in layer.__dict__])
self.L2 = T.sum([layer.L2 for layer in self.layers if "L2" in layer.__dict__])
self.params = list(itertools.chain(*[layer.params for layer in self.layers]))
self.negative_log_likelihood = self.LogisticRegressionLayer.negative_log_likelihood
self.errors = self.LogisticRegressionLayer.errors
self.predictions = self.LogisticRegressionLayer.y_pred
self.n_ins = list(itertools.chain(*[[layer.n_in]*len(layer.params) for layer in self.layers]))
print self.n_ins
print self.params
#class SennaNER_alt(Network):
# def __init__(self, input,embeddings,mini_batch_size=32,nhu=300,width=5,activation=hardtanh,seed=1234,n_out=9,name='SennaNER',params=None):
# self.name = name
# self.layers = []
# self.input = input
# self.output = None
#
# embedding_dim=embeddings.shape[1]
# features = np.eye(4)
#
# rng=np.random.RandomState(seed)
# self.HiddenLayer = DoubleEmbeddingHiddenLayer(input=input,embeddings_values=embeddings,features_values=features,n_in1=embedding_dim*width,n_in2=features.shape[0]*width, batch_size=mini_batch_size, n_out=nhu, rng=rng, activation=activation,params=params)
## self.EmbeddingLayer = EmbeddingLayer(input=input[:,:,0],w_values=embeddings,embedding_dim=embedding_dim,mini_batch_size=mini_batch_size,width=width,params=params)
## self.StaticEmbeddingLayer = StaticEmbeddingLayer(input=input[:,:,1],w_values=features,embedding_dim=features.shape[0],mini_batch_size=mini_batch_size,width=width)
## self.HiddenLayer = DoubleInputHiddenLayer(input1=self.EmbeddingLayer.output, input2=self.StaticEmbeddingLayer.output, n_in1=embedding_dim*width, n_in2=features.shape[0]*width, n_out=nhu, rng=rng, activation=activation,params=params)
# self.LogisticRegressionLayer = LogisticRegressionLayer(input=self.HiddenLayer.output,n_in=nhu,n_out=n_out, rng=rng, params=params)
# self.layers=[self.HiddenLayer,self.LogisticRegressionLayer]
#
# self.L1 = T.sum([layer.L1 for layer in self.layers if "L1" in layer.__dict__])
# self.L2 = T.sum([layer.L2 for layer in self.layers if "L2" in layer.__dict__])
#
# self.params = list(itertools.chain(*[layer.params for layer in self.layers]))
#
# self.negative_log_likelihood = self.LogisticRegressionLayer.negative_log_likelihood
# self.errors = self.LogisticRegressionLayer.errors
# self.predictions = self.LogisticRegressionLayer.y_pred
# self.n_ins = list(itertools.chain(*[[layer.n_in]*len(layer.params) for layer in self.layers]))
# print self.n_ins
# print self.params
def __init__(self):
self.session = tf.InteractiveSession()
tf.set_random_seed(FLAGS.seed)
np.random.seed(FLAGS.seed)
print('Reading embeddings...', end='', flush=True)
self.embedding = EmbeddingLayer(FLAGS.embedding)
print('done')
# Define network parameters
nkwargs = {
'in_size' : self.embedding.shape[1],
'out_size' : FLAGS.hidden,
'depth' : FLAGS.depth,
'batch_size': FLAGS.batch,
}
# Define the inputs, and their respective type & size
inputs = {
'x' : [tf.int32, [None, FLAGS.batch]],
'y' : [tf.float32, [FLAGS.batch, 5]],
'kp' : [tf.float32, []],
'lambda' : [tf.float32, []],
'sparsity' : [tf.float32, []],
'coherency' : [tf.float32, []],
}
# Create placeholders
with tf.name_scope('Placeholders'):
p = { name: tf.placeholder(*args, name=name)
for name, args in inputs.items() }
self.train_fd = lambda x,y, kp=FLAGS.keep_prob: {
p['x'] : x,
p['y'] : y,
p['kp'] : kp,
p['lambda'] : FLAGS.l2_reg,
p['sparsity'] : FLAGS.sparsity,
p['coherency'] : FLAGS.coherency,
}
dropout = lambda x: tf.nn.dropout(x, p['kp'])
bxentropy = lambda x,y: -(y * tf.log(x + 1e-8) + (1. - y) * tf.log(1. - x + 1e-8))
sq_err = lambda x,y: (x - y) ** 2
pad_mask = tf.to_float(tf.not_equal(p['x'], self.embedding.pad_id))
embedding = dropout( self.embedding.forward(p['x']) )
print('Creating model...', end='', flush=True)
self.global_step = tf.Variable(0, name='global_step', trainable=False)
self.generator = Generator(embedding, pad_mask, p, nkwargs, dropout, bxentropy)
self.encoder = Encoder(embedding, pad_mask, p, nkwargs, dropout, sq_err)
self.encoder.create_minimization(self.generator.z)
self.generator.create_minimization(self.encoder.loss_vec, self.global_step)
print('done')
def _build_graph(self):
""" Defines the model graph. """
with tf.variable_scope('{:s}_model'.format(self.name)):
# Instantiate embedding layer(s)
if self.config.untie_enc_dec_embeddings:
enc_vocab_size = self.source_vocab_size
dec_vocab_size = self.target_vocab_size
else:
assert self.source_vocab_size == self.target_vocab_size, \
'Input and output vocabularies should be identical when tying embedding tables.'
enc_vocab_size = dec_vocab_size = self.source_vocab_size
encoder_embedding_layer = EmbeddingLayer(enc_vocab_size,
self.config.embedding_size,
self.config.hidden_size,
self.float_dtype,
name='encoder_embedding_layer')
if self.config.untie_enc_dec_embeddings:
decoder_embedding_layer = EmbeddingLayer(dec_vocab_size,
self.config.embedding_size,
self.config.hidden_size,
self.float_dtype,
name='decoder_embedding_layer')
else:
decoder_embedding_layer = encoder_embedding_layer
if self.config.untie_decoder_embeddings:
softmax_projection_layer = EmbeddingLayer(dec_vocab_size,
self.config.embedding_size,
self.config.hidden_size,
self.float_dtype,
name='softmax_projection_layer')
else:
softmax_projection_layer = decoder_embedding_layer
# Instantiate the component networks
self.enc = TransformerEncoder(self.config,
encoder_embedding_layer,
self.training,
self.float_dtype,
self.gate_tracker,
'encoder')
self.dec = TransformerDecoder(self.config,
decoder_embedding_layer,
softmax_projection_layer,
self.training,
self.int_dtype,
self.float_dtype,
self.gate_tracker,
'decoder')
return dec_vocab_size
def __init__(self, hidden_size, batch_size, K, W_init, config,
max_sen_len):
super(HAQA, self).__init__()
self.embedding = EmbeddingLayer(W_init, config)
embedding_size = W_init.shape[1] + config['char_filter_size']
self.ga = GatedAttentionLayer() # non-parametrized
self.gaao = GatedAttentionAttOnly() # non-parametrized
self.ha = HopAttentionLayer() # parametrized
self.gating_w = Variable(torch.Tensor([0.5]),
requires_grad=True).to(device)
self.pred = AnswerPredictionLayer() # non-parametrized
self.K = K
self.hidden_size = hidden_size
self.context_gru_0 = BiGRU(embedding_size, hidden_size, batch_size)
self.query_gru_0 = BiGRU(embedding_size, hidden_size, batch_size)
self.context_gru_1 = BiGRU(2 * hidden_size, hidden_size, batch_size)
self.query_gru_1 = BiGRU(embedding_size, hidden_size, batch_size)
self.context_gru_2 = BiGRU(2 * hidden_size, hidden_size, batch_size)
self.query_gru_2 = BiGRU(embedding_size, hidden_size, batch_size)
self.context_gru_3 = BiGRU(2 * hidden_size, hidden_size, batch_size)
self.query_gru_3 = BiGRU(embedding_size, hidden_size, batch_size)
self.max_sentence = MaxAttSentence(max_sen_len, 2 * hidden_size)
def build_Emb_layer(self):
return EmbeddingLayer(self.in_dim,
self.ins_dim,
self.hid_dim,
self.out_dim,
activation=self.activation,
side_information=self.side_information,
bias=self.bias,
dropout=self.dropout,
use_cuda=self.use_cuda)
def main_graph(self,
trained_model,
scope,
emb_dim,
cell,
rnn_dim,
rnn_num,
drop_out=0.5,
emb=None):
if trained_model is not None:
param_dic = {
'nums_chars': self.nums_chars,
'nums_tags': self.nums_tags,
'crf': self.crf,
'emb_dim': emb_dim,
'cell': cell,
'rnn_dim': rnn_dim,
'rnn_num': rnn_num,
'drop_out': drop_out,
'buckets_char': self.buckets_char,
'ngram': self.ngram,
'is_space': self.is_space,
'sent_seg': self.sent_seg,
'emb_path': self.emb_path,
'tag_scheme': self.tag_scheme
}
#print param_dic
f_model = open(trained_model, 'w')
pickle.dump(param_dic, f_model)
f_model.close()
# define shared weights and variables
batch_size_h = tf.placeholder(tf.int32, [], name='batch_size_holder')
dr = tf.placeholder(tf.float32, [], name='drop_out_holder')
self.batch_size_h = batch_size_h
self.drop_out = dr
self.drop_out_v = drop_out
# pdb.set_trace()
self.emb_layer = EmbeddingLayer(self.nums_chars + 20,
emb_dim,
weights=emb,
name='emb_layer')
if self.ngram is not None:
ng_embs = [None for _ in range(len(self.ngram))]
for i, n_gram in enumerate(self.ngram):
self.gram_layers.append(
EmbeddingLayer(n_gram + 5000 * (i + 2),
emb_dim,
weights=ng_embs[i],
name=str(i + 2) + 'gram_layer'))
with tf.variable_scope('BiRNN'):
if cell == 'gru':
fw_rnn_cell = tf.contrib.rnn.GRUCell(rnn_dim) #forward
bw_rnn_cell = tf.contrib.rnn.GRUCell(rnn_dim) #backward
else:
fw_rnn_cell = tf.contrib.rnn.LSTMCell(rnn_dim,
state_is_tuple=True)
bw_rnn_cell = tf.contrib.rnn.LSTMCell(rnn_dim,
state_is_tuple=True)
if rnn_num > 1:
fw_rnn_cell = tf.contrib.rnn.MultiRNNCell([fw_rnn_cell] *
rnn_num,
state_is_tuple=True)
bw_rnn_cell = tf.contrib.rnn.MultiRNNCell([bw_rnn_cell] *
rnn_num,
state_is_tuple=True)
output_wrapper = HiddenLayer(rnn_dim * 2,
self.nums_tags,
activation='linear',
name='hidden')
#define model for each bucket
for idx, bucket in enumerate(self.buckets_char):
if idx == 1:
scope.reuse_variables()
t1 = time()
batch_size = self.real_batches[idx]
input_v1 = tf.placeholder(tf.int32, [None, bucket],
name='input_1' + str(bucket))
input_v2 = tf.placeholder(tf.int32, [None, bucket],
name='input_2' + str(bucket))
self.input_v1.append([input_v1])
self.input_v2.append([input_v2])
#output = None
output = []
for i in range(self.num_gpus):
with tf.device('/gpu:{}'.format(i)):
input_1 = input_v1[i * batch_size_h:(i + 1) * batch_size_h]
input_2 = input_v2[i * batch_size_h:(i + 1) * batch_size_h]
emb_set1 = []
emb_set2 = []
word_out1 = self.emb_layer(input_1)
word_out2 = self.emb_layer(input_2)
emb_set1.append(word_out1)
emb_set2.append(word_out2)
# if self.ngram is not None:
# for i in range(len(self.ngram)):
# input_g = tf.placeholder(tf.int32, [None, bucket], name='input_g' + str(i) + str(bucket))
# self.input_v[-1].append(input_g)
# gram_out = self.gram_layers[i](input_g)
# emb_set.append(gram_out)
if len(emb_set1) > 1:
emb_out1 = tf.concat(axis=2, values=emb_set1)
emb_out2 = tf.concat(axis=2, values=emb_set2)
else:
emb_out1 = emb_set1[0]
emb_out2 = emb_set2[0]
emb_out1 = DropoutLayer(dr)(emb_out1)
emb_out2 = DropoutLayer(dr)(emb_out2)
rnn_out = BiLSTM(rnn_dim,
fw_cell=fw_rnn_cell,
bw_cell=bw_rnn_cell,
p=dr,
name='BiLSTM' + str(bucket),
scope='BiRNN')(emb_out1, emb_out2,
input_v1)
output_g = output_wrapper(rnn_out)
# if output == None:
# output = output_g
# else:
# output = tf.concat([output,output_g],axis = 0)
#pdb.set_trace()
output.append(output_g)
self.output.append([output])
self.output_.append([
tf.placeholder(tf.int32, [None, bucket - 1],
name='tags' + str(bucket))
])
self.bucket_dit[bucket] = idx
print 'Bucket %d, %f seconds' % (idx + 1, time() - t1)
assert len(self.input_v1) == len(self.output)
self.params = tf.trainable_variables()
self.saver = tf.train.Saver()
def main_graph(self, trained_model, scope, emb_dim, gru, rnn_dim, rnn_num, drop_out=0.5, rad_dim=30, emb=None, ng_embs=None, pixels=None, con_width=None, filters=None, pooling_size=None):
if trained_model is not None:
param_dic = {}
param_dic['nums_chars'] = self.nums_chars
param_dic['nums_tags'] = self.nums_tags
param_dic['tag_scheme'] = self.tag_scheme
param_dic['graphic'] = self.graphic
param_dic['pic_size'] = self.pic_size
param_dic['word_vec'] = self.word_vec
param_dic['radical'] = self.radical
param_dic['crf'] = self.crf
param_dic['emb_dim'] = emb_dim
param_dic['gru'] = gru
param_dic['rnn_dim'] = rnn_dim
param_dic['rnn_num'] = rnn_num
param_dic['drop_out'] = drop_out
param_dic['filter_size'] = con_width
param_dic['filters'] = filters
param_dic['pooling_size'] = pooling_size
param_dic['font'] = self.font
param_dic['buckets_char'] = self.buckets_char
param_dic['ngram'] = self.ngram
#print param_dic
f_model = open(trained_model, 'w')
pickle.dump(param_dic, f_model)
f_model.close()
# define shared weights and variables
dr = tf.placeholder(tf.float32, [], name='drop_out_holder')
self.drop_out = dr
self.drop_out_v = drop_out
if self.word_vec:
self.emb_layer = EmbeddingLayer(self.nums_chars + 500, emb_dim, weights=emb, name='emb_layer')
if self.radical:
self.radical_layer = EmbeddingLayer(216, rad_dim, name='radical_layer')
if self.ngram is not None:
if ng_embs is not None:
assert len(ng_embs) == len(self.ngram)
else:
ng_embs = [None for _ in range(len(self.ngram))]
for i, n_gram in enumerate(self.ngram):
self.gram_layers.append(EmbeddingLayer(n_gram + 1000 * (i + 2), emb_dim, weights=ng_embs[i], name= str(i + 2) + 'gram_layer'))
wrapper_conv_1, wrapper_mp_1, wrapper_conv_2, wrapper_mp_2, wrapper_dense, wrapper_dr = None, None, None, None, None, None
if self.graphic:
self.input_p = []
assert pixels is not None and filters is not None and pooling_size is not None and con_width is not None
self.pixels = pixels
pixel_dim = int(math.sqrt(len(pixels[0])))
wrapper_conv_1 = TimeDistributed(Convolution(con_width, 1, filters, name='conv_1'), name='wrapper_c1')
wrapper_mp_1 = TimeDistributed(Maxpooling(pooling_size, pooling_size, name='pooling_1'), name='wrapper_p1')
p_size_1 = toolbox.down_pool(pixel_dim, pooling_size)
wrapper_conv_2 = TimeDistributed(Convolution(con_width, filters, filters, name='conv_2'), name='wrapper_c2')
wrapper_mp_2 = TimeDistributed(Maxpooling(pooling_size, pooling_size, name='pooling_2'), name='wrapper_p2')
p_size_2 = toolbox.down_pool(p_size_1, pooling_size)
wrapper_dense = TimeDistributed(HiddenLayer(p_size_2 * p_size_2 * filters, 100, activation='tanh', name='conv_dense'), name='wrapper_3')
wrapper_dr = TimeDistributed(DropoutLayer(self.drop_out), name='wrapper_dr')
with tf.variable_scope('BiRNN'):
if gru:
fw_rnn_cell = tf.nn.rnn_cell.GRUCell(rnn_dim)
bw_rnn_cell = tf.nn.rnn_cell.GRUCell(rnn_dim)
else:
fw_rnn_cell = tf.nn.rnn_cell.LSTMCell(rnn_dim, state_is_tuple=True)
bw_rnn_cell = tf.nn.rnn_cell.LSTMCell(rnn_dim, state_is_tuple=True)
if rnn_num > 1:
fw_rnn_cell = tf.nn.rnn_cell.MultiRNNCell([fw_rnn_cell]*rnn_num, state_is_tuple=True)
bw_rnn_cell = tf.nn.rnn_cell.MultiRNNCell([bw_rnn_cell]*rnn_num, state_is_tuple=True)
output_wrapper = TimeDistributed(HiddenLayer(rnn_dim * 2, self.nums_tags[0], activation='linear', name='hidden'), name='wrapper')
#define model for each bucket
for idx, bucket in enumerate(self.buckets_char):
if idx == 1:
scope.reuse_variables()
t1 = time()
input_v = tf.placeholder(tf.int32, [None, bucket], name='input_' + str(bucket))
self.input_v.append([input_v])
emb_set = []
if self.word_vec:
word_out = self.emb_layer(input_v)
emb_set.append(word_out)
if self.radical:
input_r = tf.placeholder(tf.int32, [None, bucket], name='input_r' + str(bucket))
self.input_v[-1].append(input_r)
radical_out = self.radical_layer(input_r)
emb_set.append(radical_out)
if self.ngram is not None:
for i in range(len(self.ngram)):
input_g = tf.placeholder(tf.int32, [None, bucket], name='input_g' + str(i) + str(bucket))
self.input_v[-1].append(input_g)
gram_out = self.gram_layers[i](input_g)
emb_set.append(gram_out)
if self.graphic:
input_p = tf.placeholder(tf.float32, [None, bucket, pixel_dim*pixel_dim])
self.input_p.append(input_p)
pix_out = tf.reshape(input_p, [-1, bucket, pixel_dim, pixel_dim, 1])
pix_out = tf.unpack(pix_out, axis=1)
conv_out_1 = wrapper_conv_1(pix_out)
pooling_out_1 = wrapper_mp_1(conv_out_1)
conv_out_2 = wrapper_conv_2(pooling_out_1)
pooling_out_2 = wrapper_mp_2(conv_out_2)
assert p_size_2 == pooling_out_2[0].get_shape().as_list()[1]
pooling_out = tf.reshape(pooling_out_2, [-1, bucket, p_size_2 * p_size_2 * filters])
pooling_out = tf.unpack(pooling_out, axis=1)
graphic_out = wrapper_dense(pooling_out)
graphic_out = wrapper_dr(graphic_out)
emb_set.append(graphic_out)
if len(emb_set) > 1:
emb_out = tf.concat(2, emb_set)
emb_out = tf.unpack(emb_out)
else:
emb_out = emb_set[0]
rnn_out = BiLSTM(rnn_dim, fw_cell=fw_rnn_cell, bw_cell=bw_rnn_cell, p=dr, name='BiLSTM' + str(bucket), scope='BiRNN')(emb_out, input_v)
output = output_wrapper(rnn_out)
output_c = tf.pack(output, axis=1)
self.output.append([output_c])
self.output_.append([tf.placeholder(tf.int32, [None, bucket], name='tags' + str(bucket))])
self.bucket_dit[bucket] = idx
print 'Bucket %d, %f seconds' % (idx + 1, time() - t1)
assert len(self.input_v) == len(self.output) and len(self.output) == len(self.output_) and len(self.output) == len(self.counts)
self.params = tf.trainable_variables()
self.saver = tf.train.Saver()
def main_graph(self, trained_model, scope, emb_dim, gru, rnn_dim, rnn_num, drop_out=0.5, emb=None):
if trained_model is not None:
param_dic = {'nums_chars': self.nums_chars, 'nums_tags': self.nums_tags, 'crf': self.crf, 'emb_dim': emb_dim,
'gru': gru, 'rnn_dim': rnn_dim, 'rnn_num': rnn_num, 'drop_out': drop_out, 'buckets_char': self.buckets_char,
'ngram': self.ngram, 'is_space': self.is_space, 'sent_seg': self.sent_seg, 'emb_path': self.emb_path,
'tag_scheme': self.tag_scheme}
#print param_dic
f_model = open(trained_model, 'w')
pickle.dump(param_dic, f_model)
f_model.close()
# define shared weights and variables
dr = tf.placeholder(tf.float32, [], name='drop_out_holder')
self.drop_out = dr
self.drop_out_v = drop_out
self.emb_layer = EmbeddingLayer(self.nums_chars + 20, emb_dim, weights=emb, name='emb_layer')
if self.ngram is not None:
ng_embs = [None for _ in range(len(self.ngram))]
for i, n_gram in enumerate(self.ngram):
self.gram_layers.append(EmbeddingLayer(n_gram + 5000 * (i + 2), emb_dim, weights=ng_embs[i], name= str(i + 2) + 'gram_layer'))
with tf.variable_scope('BiRNN'):
if gru:
fw_rnn_cell = tf.nn.rnn_cell.GRUCell(rnn_dim)
bw_rnn_cell = tf.nn.rnn_cell.GRUCell(rnn_dim)
else:
fw_rnn_cell = tf.nn.rnn_cell.LSTMCell(rnn_dim, state_is_tuple=True)
bw_rnn_cell = tf.nn.rnn_cell.LSTMCell(rnn_dim, state_is_tuple=True)
if rnn_num > 1:
fw_rnn_cell = tf.nn.rnn_cell.MultiRNNCell([fw_rnn_cell]*rnn_num, state_is_tuple=True)
bw_rnn_cell = tf.nn.rnn_cell.MultiRNNCell([bw_rnn_cell]*rnn_num, state_is_tuple=True)
output_wrapper = TimeDistributed(HiddenLayer(rnn_dim * 2, self.nums_tags, activation='linear', name='hidden'), name='wrapper')
#define model for each bucket
for idx, bucket in enumerate(self.buckets_char):
if idx == 1:
scope.reuse_variables()
t1 = time()
input_v = tf.placeholder(tf.int32, [None, bucket], name='input_' + str(bucket))
self.input_v.append([input_v])
emb_set = []
word_out = self.emb_layer(input_v)
emb_set.append(word_out)
if self.ngram is not None:
for i in range(len(self.ngram)):
input_g = tf.placeholder(tf.int32, [None, bucket], name='input_g' + str(i) + str(bucket))
self.input_v[-1].append(input_g)
gram_out = self.gram_layers[i](input_g)
emb_set.append(gram_out)
if len(emb_set) > 1:
emb_out = tf.concat(2, emb_set)
else:
emb_out = emb_set[0]
emb_out = DropoutLayer(dr)(emb_out)
emb_out = tf.unpack(emb_out)
rnn_out = BiLSTM(rnn_dim, fw_cell=fw_rnn_cell, bw_cell=bw_rnn_cell, p=dr, name='BiLSTM' + str(bucket), scope='BiRNN')(emb_out, input_v)
output = output_wrapper(rnn_out)
output_c = tf.pack(output, axis=1)
self.output.append([output_c])
self.output_.append([tf.placeholder(tf.int32, [None, bucket], name='tags' + str(bucket))])
self.bucket_dit[bucket] = idx
print 'Bucket %d, %f seconds' % (idx + 1, time() - t1)
assert len(self.input_v) == len(self.output) and len(self.output) == len(self.output_) and len(self.output) == len(self.counts)
self.params = tf.trainable_variables()
self.saver = tf.train.Saver()
def main_graph(self,
trained_model,
scope,
emb_dim,
gru,
rnn_dim,
rnn_num,
fnn_dim,
window_size,
drop_out=0.5,
rad_dim=30,
emb=None,
ng_embs=None,
pixels=None,
con_width=None,
filters=None,
pooling_size=None):
if trained_model is not None:
param_dic = {}
param_dic['nums_chars'] = self.nums_chars
param_dic['nums_tags'] = self.nums_tags
param_dic['tag_scheme'] = self.tag_scheme
param_dic['graphic'] = self.graphic
param_dic['pic_size'] = self.pic_size
param_dic['word_vec'] = self.word_vec
param_dic['radical'] = self.radical
param_dic['crf'] = self.crf
param_dic['emb_dim'] = emb_dim
param_dic['gru'] = gru
param_dic['rnn_dim'] = rnn_dim
param_dic['rnn_num'] = rnn_num
param_dic['fnn_dim'] = fnn_dim
param_dic['window_size'] = window_size
param_dic['drop_out'] = drop_out
param_dic['filter_size'] = con_width
param_dic['filters'] = filters
param_dic['pooling_size'] = pooling_size
param_dic['font'] = self.font
param_dic['buckets_char'] = self.buckets_char
param_dic['ngram'] = self.ngram
param_dic['mode'] = self.mode
#print param_dic
if self.metric == 'All':
pindex = trained_model.rindex('/') + 1
for m in self.all_metrics:
f_model = open(
trained_model[:pindex] + m + '_' +
trained_model[pindex:], 'w')
pickle.dump(param_dic, f_model)
f_model.close()
else:
f_model = open(trained_model, 'w')
pickle.dump(param_dic, f_model)
f_model.close()
# define shared weights and variables
dr = tf.placeholder(tf.float32, [], name='drop_out_holder')
self.drop_out = dr
self.drop_out_v = drop_out
#concat_emb_dim = emb_dim * 2
concat_emb_dim = 0
if self.word_vec:
self.emb_layer = EmbeddingLayer(self.nums_chars + 500,
emb_dim,
weights=emb,
name='emb_layer')
concat_emb_dim += emb_dim
if self.radical:
self.radical_layer = EmbeddingLayer(216,
rad_dim,
name='radical_layer')
concat_emb_dim += rad_dim
if self.ngram is not None:
if ng_embs is not None:
assert len(ng_embs) == len(self.ngram)
else:
ng_embs = [None for _ in range(len(self.ngram))]
for i, n_gram in enumerate(self.ngram):
self.gram_layers.append(
EmbeddingLayer(n_gram + 1000 * (i + 2),
emb_dim,
weights=ng_embs[i],
name=str(i + 2) + 'gram_layer'))
concat_emb_dim += emb_dim
wrapper_conv_1, wrapper_mp_1, wrapper_conv_2 = None, None, None
wrapper_mp_2, wrapper_dense, wrapper_dr = None, None, None
if self.graphic:
self.input_p = []
assert pixels is not None and filters is not None and pooling_size is not None and con_width is not None
self.pixels = pixels
pixel_dim = int(math.sqrt(len(pixels[0])))
wrapper_conv_1 = Convolution(con_width, 1, filters, name='conv_1')
wrapper_mp_1 = Maxpooling(pooling_size,
pooling_size,
name='pooling_1')
p_size_1 = toolbox.down_pool(pixel_dim, pooling_size)
wrapper_conv_2 = Convolution(con_width,
filters,
filters,
name='conv_2')
wrapper_mp_2 = Maxpooling(pooling_size,
pooling_size,
name='pooling_2')
p_size_2 = toolbox.down_pool(p_size_1, pooling_size)
wrapper_dense = HiddenLayer(p_size_2 * p_size_2 * filters,
100,
activation='tanh',
name='conv_dense')
wrapper_dr = DropoutLayer(self.drop_out)
concat_emb_dim += 100
fw_rnn_cell, bw_rnn_cell = None, None
if self.mode == 'RNN':
with tf.variable_scope('BiRNN'):
if gru:
fw_rnn_cell = tf.nn.rnn_cell.GRUCell(rnn_dim)
bw_rnn_cell = tf.nn.rnn_cell.GRUCell(rnn_dim)
else:
fw_rnn_cell = tf.nn.rnn_cell.LSTMCell(rnn_dim,
state_is_tuple=True)
bw_rnn_cell = tf.nn.rnn_cell.LSTMCell(rnn_dim,
state_is_tuple=True)
if rnn_num > 1:
fw_rnn_cell = tf.nn.rnn_cell.MultiRNNCell(
[fw_rnn_cell] * rnn_num, state_is_tuple=True)
bw_rnn_cell = tf.nn.rnn_cell.MultiRNNCell(
[bw_rnn_cell] * rnn_num, state_is_tuple=True)
output_wrapper = HiddenLayer(rnn_dim * 2,
self.nums_tags[0],
activation='linear',
name='out_wrapper')
fnn_weights, fnn_bias = None, None
else:
with tf.variable_scope('FNN'):
fnn_weights = tf.get_variable(
'conv_w',
[2 * window_size + 1, concat_emb_dim, 1, fnn_dim])
fnn_bias = tf.get_variable(
'conv_b', [fnn_dim],
initializer=tf.constant_initializer(0.1))
output_wrapper = HiddenLayer(fnn_dim,
self.nums_tags[0],
activation='linear',
name='out_wrapper')
#define model for each bucket
for idx, bucket in enumerate(self.buckets_char):
if idx == 1:
scope.reuse_variables()
t1 = time()
input_v = tf.placeholder(tf.int32, [None, bucket],
name='input_' + str(bucket))
self.input_v.append([input_v])
emb_set = []
if self.word_vec:
word_out = self.emb_layer(input_v)
emb_set.append(word_out)
if self.radical:
input_r = tf.placeholder(tf.int32, [None, bucket],
name='input_r' + str(bucket))
self.input_v[-1].append(input_r)
radical_out = self.radical_layer(input_r)
emb_set.append(radical_out)
if self.ngram is not None:
for i in range(len(self.ngram)):
input_g = tf.placeholder(tf.int32, [None, bucket],
name='input_g' + str(i) +
str(bucket))
self.input_v[-1].append(input_g)
gram_out = self.gram_layers[i](input_g)
emb_set.append(gram_out)
if self.graphic:
input_p = tf.placeholder(tf.float32,
[None, bucket, pixel_dim * pixel_dim])
self.input_p.append(input_p)
pix_out = tf.reshape(input_p, [-1, pixel_dim, pixel_dim, 1])
conv_out_1 = wrapper_conv_1(pix_out)
pooling_out_1 = wrapper_mp_1(conv_out_1)
conv_out_2 = wrapper_conv_2(pooling_out_1)
pooling_out_2 = wrapper_mp_2(conv_out_2)
assert p_size_2 == pooling_out_2[0].get_shape().as_list()[1]
pooling_out = tf.reshape(
pooling_out_2, [-1, bucket, p_size_2 * p_size_2 * filters])
graphic_out = wrapper_dense(pooling_out)
graphic_out = wrapper_dr(graphic_out)
emb_set.append(graphic_out)
if len(emb_set) > 1:
emb_out = tf.concat(axis=2, values=emb_set)
else:
emb_out = emb_set[0]
if self.mode == 'RNN':
rnn_out = BiLSTM(rnn_dim,
fw_cell=fw_rnn_cell,
bw_cell=bw_rnn_cell,
p=dr,
name='BiLSTM' + str(bucket),
scope='BiRNN')(emb_out, input_v)
output = output_wrapper(rnn_out)
else:
emb_out = tf.pad(emb_out,
[[0, 0], [window_size, window_size], [0, 0]])
emb_out = tf.reshape(
emb_out, [-1, bucket + 2 * window_size, concat_emb_dim, 1])
conv_out = tf.nn.conv2d(emb_out,
fnn_weights, [1, 1, 1, 1],
padding='VALID') + fnn_bias
fnn_out = tf.nn.tanh(conv_out)
fnn_out = tf.reshape(fnn_out, [-1, bucket, fnn_dim])
output = output_wrapper(fnn_out)
self.output.append([output])
self.output_.append([
tf.placeholder(tf.int32, [None, bucket],
name='tags' + str(bucket))
])
self.bucket_dit[bucket] = idx
print 'Bucket %d, %f seconds' % (idx + 1, time() - t1)
assert len(self.input_v) == len(self.output) and len(self.output) == len(self.output_) \
and len(self.output) == len(self.counts)
self.params = tf.trainable_variables()
self.saver = tf.train.Saver()
class Model(object):
def __init__(self):
self.session = tf.InteractiveSession()
tf.set_random_seed(FLAGS.seed)
np.random.seed(FLAGS.seed)
print('Reading embeddings...', end='', flush=True)
self.embedding = EmbeddingLayer(FLAGS.embedding)
print('done')
# Define network parameters
nkwargs = {
'in_size' : self.embedding.shape[1],
'out_size' : FLAGS.hidden,
'depth' : FLAGS.depth,
'batch_size': FLAGS.batch,
}
# Define the inputs, and their respective type & size
inputs = {
'x' : [tf.int32, [None, FLAGS.batch]],
'y' : [tf.float32, [FLAGS.batch, 5]],
'kp' : [tf.float32, []],
'lambda' : [tf.float32, []],
'sparsity' : [tf.float32, []],
'coherency' : [tf.float32, []],
}
# Create placeholders
with tf.name_scope('Placeholders'):
p = { name: tf.placeholder(*args, name=name)
for name, args in inputs.items() }
self.train_fd = lambda x,y, kp=FLAGS.keep_prob: {
p['x'] : x,
p['y'] : y,
p['kp'] : kp,
p['lambda'] : FLAGS.l2_reg,
p['sparsity'] : FLAGS.sparsity,
p['coherency'] : FLAGS.coherency,
}
dropout = lambda x: tf.nn.dropout(x, p['kp'])
bxentropy = lambda x,y: -(y * tf.log(x + 1e-8) + (1. - y) * tf.log(1. - x + 1e-8))
sq_err = lambda x,y: (x - y) ** 2
pad_mask = tf.to_float(tf.not_equal(p['x'], self.embedding.pad_id))
embedding = dropout( self.embedding.forward(p['x']) )
print('Creating model...', end='', flush=True)
self.global_step = tf.Variable(0, name='global_step', trainable=False)
self.generator = Generator(embedding, pad_mask, p, nkwargs, dropout, bxentropy)
self.encoder = Encoder(embedding, pad_mask, p, nkwargs, dropout, sq_err)
self.encoder.create_minimization(self.generator.z)
self.generator.create_minimization(self.encoder.loss_vec, self.global_step)
print('done')
def train(self):
print('Initializing variables...', end='', flush=True)
logdir = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'log')
writer = tf.summary.FileWriter(logdir, self.session.graph)
saver = tf.train.Saver()
self.session.run(tf.global_variables_initializer())
checkpoint = tf.train.get_checkpoint_state(FLAGS.checkpoint)
if checkpoint and checkpoint.model_checkpoint_path:
print('restoring previous checkpoint...', end='', flush=True)
name = os.path.basename(checkpoint.model_checkpoint_path)
saver.restore(self.session, os.path.join(FLAGS.checkpoint, name))
merger = tf.summary.merge_all()
print('done')
print('Fetching data...', end='', flush=True)
x,y = read_data(FLAGS.training)
train = ([self.embedding.words_to_ids(s) for s in x], y)
x,y = read_data(FLAGS.testing)
test = ([self.embedding.words_to_ids(s) for s in x], y)
print('done')
for epoch in range(FLAGS.epochs):
start_time = time.time()
train_x, train_y = preprocess(train, FLAGS.batch, self.embedding.pad_id,
FLAGS.maxlen)
scost = ocost = tcost = p_one = 0
for bx,by in zip(train_x, train_y):
result = self.session.run([merger,
self.generator.train_g, self.encoder.train_e,
self.generator.reg, self.generator.obj,
self.encoder.loss, self.generator.z,
self.global_step],
feed_dict=self.train_fd(bx, by))
writer.add_summary(result[0], result[7])
scost += result[3]
ocost += result[4]
tcost += result[5]
p_one += np.sum(result[6]) / FLAGS.batch / len(bx[0])
print('Regularization: ', scost / float(len(train_x)))
print('Objective: ', ocost / float(len(train_x)))
print('Prediction loss: ', tcost / float(len(train_x)))
print('Generator Selection %: ', p_one / float(len(train_x)))
if not epoch % 1:
results = []
ocost = tcost = 0
test_x, test_y = preprocess(test, FLAGS.batch, self.embedding.pad_id,
FLAGS.maxlen)
for bx,by in zip(test_x, test_y):
preds, bz, gobj, eloss = self.session.run([
self.encoder.preds,
self.generator.z,
self.generator.obj,
self.encoder.loss],
feed_dict=self.train_fd(bx, by, 1.))
ocost += gobj
tcost += eloss
for p, x, y, z in zip(preds, bx.T, by, bz.T):
w = self.embedding.ids_to_words(x)
w = [u.replace('<pad>', '_') for u in w]
r = [u if v == 1 else '_' for u,v in zip(w,z)]
results.append((p, r, w, y))
print('Test Objective: ', ocost / float(len(test_x)))
print('Test Prediction loss: ',tcost / float(len(test_x)))
with open(FLAGS.output, 'w+') as f:
for p, r, w, y in results:
f.write(json.dumps({
'rationale' : ' '.join(r),
'original' : ' '.join(w),
'y' : str(list(y)),
'p' : str(list(p)),
}) + '\n')
saver.save(self.session,
os.path.join(FLAGS.checkpoint, 'GEN.model'),
global_step=self.global_step)
print('Finished epoch %s in %.2f seconds\n' % (epoch, time.time() - start_time))
def main_graph(self, trained_model, scope, emb_dim, gru, rnn_dim, rnn_num, drop_out=0.5, rad_dim=30, emb=None,
ngram_embedding=None, pixels=None, con_width=None, filters=None, pooling_size=None):
"""
:param trained_model:
:param scope:
:param emb_dim:
:param gru:
:param rnn_dim:
:param rnn_num:
:param drop_out:
:param rad_dim: n
:param emb:
:param ngram_embedding: 预训练 ngram embeddig 文件
:param pixels:
:param con_width:
:param filters:
:param pooling_size:
:return:
"""
# trained_model: 模型存储路径
if trained_model is not None:
param_dic = {'nums_chars': self.nums_chars, 'nums_tags': self.nums_tags, 'tag_scheme': self.tag_scheme,
'graphic': self.graphic, 'pic_size': self.pic_size, 'word_vec': self.word_vec,
'radical': self.radical, 'crf': self.crf, 'emb_dim': emb_dim, 'gru': gru, 'rnn_dim': rnn_dim,
'rnn_num': rnn_num, 'drop_out': drop_out, 'filter_size': con_width, 'filters': filters,
'pooling_size': pooling_size, 'font': self.font, 'buckets_char': self.buckets_char,
'ngram': self.ngram}
print "RNN dimension is %d" % rnn_dim
print "RNN number is %d" % rnn_num
print "Character embedding size is %d" % emb_dim
print "Ngram embedding dimension is %d" % emb_dim
# 存储模型超参数
if self.metric == 'All':
# rindex() 返回子字符串 str 在字符串中最后出现的位置
# 截取模型文件名
pindex = trained_model.rindex('/') + 1
for m in self.all_metrics:
f_model = open(trained_model[:pindex] + m + '_' + trained_model[pindex:], 'w')
pickle.dump(param_dic, f_model)
f_model.close()
else:
f_model = open(trained_model, 'w')
pickle.dump(param_dic, f_model)
f_model.close()
# define shared weights and variables
dr = tf.placeholder(tf.float32, [], name='drop_out_holder')
self.drop_out = dr
self.drop_out_v = drop_out
# 字向量层
# 为什么字符数要加 500 ？
# emb_dim 是每个字符的特征向量维度，可以通过命令行参数设置
# weights 表示预训练的字向量，可以通过命令行参数设置
if self.word_vec:
self.emb_layer = EmbeddingLayer(self.nums_chars + 500, emb_dim, weights=emb, name='emb_layer')
# 偏旁部首向量
# 依照《康熙字典》，共有 214 个偏旁部首。
# 只用了常见汉字的偏旁部首，非常见汉字和非汉字的偏旁部首用其他两个特殊符号代替，
# 所以共有 216 个偏旁部首
if self.radical:
self.radical_layer = EmbeddingLayer(216, rad_dim, name='radical_layer')
if self.ngram is not None:
if ngram_embedding is not None:
assert len(ngram_embedding) == len(self.ngram)
else:
ngram_embedding = [None for _ in range(len(self.ngram))]
for i, n_gram in enumerate(self.ngram):
self.gram_layers.append(EmbeddingLayer(n_gram + 1000 * (i + 2), emb_dim, weights=ngram_embedding[i],
name=str(i + 2) + 'gram_layer'))
wrapper_conv_1, wrapper_mp_1, wrapper_conv_2, wrapper_mp_2, wrapper_dense, wrapper_dr = \
None, None, None, None, None, None
if self.graphic:
# 使用图像信息，需要用到 CNN
self.input_p = []
assert pixels is not None and filters is not None and pooling_size is not None and con_width is not None
self.pixels = pixels
pixel_dim = int(math.sqrt(len(pixels[0])))
wrapper_conv_1 = TimeDistributed(Convolution(con_width, 1, filters, name='conv_1'), name='wrapper_c1')
wrapper_mp_1 = TimeDistributed(Maxpooling(pooling_size, pooling_size, name='pooling_1'), name='wrapper_p1')
p_size_1 = toolbox.down_pool(pixel_dim, pooling_size)
wrapper_conv_2 = TimeDistributed(Convolution(con_width, filters, filters, name='conv_2'), name='wrapper_c2')
wrapper_mp_2 = TimeDistributed(Maxpooling(pooling_size, pooling_size, name='pooling_2'), name='wrapper_p2')
p_size_2 = toolbox.down_pool(p_size_1, pooling_size)
wrapper_dense = TimeDistributed(
HiddenLayer(p_size_2 * p_size_2 * filters, 100, activation='tanh', name='conv_dense'), name='wrapper_3')
wrapper_dr = TimeDistributed(DropoutLayer(self.drop_out), name='wrapper_dr')
with tf.variable_scope('BiRNN'):
if gru:
fw_rnn_cell = tf.nn.rnn_cell.GRUCell(rnn_dim)
bw_rnn_cell = tf.nn.rnn_cell.GRUCell(rnn_dim)
else:
fw_rnn_cell = tf.nn.rnn_cell.LSTMCell(rnn_dim, state_is_tuple=True)
bw_rnn_cell = tf.nn.rnn_cell.LSTMCell(rnn_dim, state_is_tuple=True)
if rnn_num > 1:
fw_rnn_cell = tf.nn.rnn_cell.MultiRNNCell([fw_rnn_cell] * rnn_num, state_is_tuple=True)
bw_rnn_cell = tf.nn.rnn_cell.MultiRNNCell([bw_rnn_cell] * rnn_num, state_is_tuple=True)
# 隐藏层，输入是前向 RNN 的输出加上 后向 RNN 的输出，所以输入维度为 rnn_dim * 2
# 输出维度即标签个数
output_wrapper = TimeDistributed(
HiddenLayer(rnn_dim * 2, self.nums_tags[0], activation='linear', name='hidden'),
name='wrapper')
# define model for each bucket
# 每一个 bucket 中的句子长度不一样，所以需要定义单独的模型
# bucket: bucket 中的句子长度
for idx, bucket in enumerate(self.buckets_char):
if idx == 1:
# scope 是 tf.variable_scope("tagger", reuse=None, initializer=initializer)
# 只需要设置一次 reuse，后面就都 reuse 了
scope.reuse_variables()
t1 = time()
# 输入的句子，one-hot 向量
# shape = （batch_size, 句子长度）
input_sentences = tf.placeholder(tf.int32, [None, bucket], name='input_' + str(bucket))
self.input_v.append([input_sentences])
emb_set = []
if self.word_vec:
# 根据 one-hot 向量查找对应的字向量
# word_out: shape=(batch_size, 句子长度，字向量维度（64）)
word_out = self.emb_layer(input_sentences)
emb_set.append(word_out)
if self.radical:
# 嵌入偏旁部首信息，shape = (batch_size, 句子长度)
input_radicals = tf.placeholder(tf.int32, [None, bucket], name='input_r' + str(bucket))
self.input_v[-1].append(input_radicals)
radical_out = self.radical_layer(input_radicals)
emb_set.append(radical_out)
if self.ngram is not None:
for i in range(len(self.ngram)):
input_g = tf.placeholder(tf.int32, [None, bucket], name='input_g' + str(i) + str(bucket))
self.input_v[-1].append(input_g)
gram_out = self.gram_layers[i](input_g)
emb_set.append(gram_out)
if self.graphic:
input_p = tf.placeholder(tf.float32, [None, bucket, pixel_dim * pixel_dim])
self.input_p.append(input_p)
pix_out = tf.reshape(input_p, [-1, bucket, pixel_dim, pixel_dim, 1])
conv_out_1 = wrapper_conv_1(pix_out)
pooling_out_1 = wrapper_mp_1(conv_out_1)
conv_out_2 = wrapper_conv_2(pooling_out_1)
pooling_out_2 = wrapper_mp_2(conv_out_2)
assert p_size_2 == pooling_out_2[0].get_shape().as_list()[1]
pooling_out = tf.reshape(pooling_out_2, [-1, bucket, p_size_2 * p_size_2 * filters])
pooling_out = tf.unstack(pooling_out, axis=1)
graphic_out = wrapper_dense(pooling_out)
graphic_out = wrapper_dr(graphic_out)
emb_set.append(graphic_out)
if self.window_size > 1:
padding_size = int(np.floor(self.window_size / 2))
word_padded = tf.pad(word_out, [[0, 0], [padding_size, padding_size], [0, 0]], 'CONSTANT')
Ws = []
for q in range(1, self.window_size + 1):
Ws.append(tf.get_variable("W_%d" % q, shape=[q * emb_dim, self.filters_number]))
b = tf.get_variable("b", shape=[self.filters_number])
z = [None for _ in range(0, bucket)]
for q in range(1, self.window_size + 1):
for i in range(padding_size, bucket + padding_size):
low = i - int(np.floor((q - 1) / 2))
high = i + int(np.ceil((q + 1) / 2))
x = word_padded[:, low, :]
for j in range(low + 1, high):
x = tf.concat(values=[x, word_padded[:, j, :]], axis=1)
z_iq = tf.tanh(tf.nn.xw_plus_b(x, Ws[q - 1], b))
if z[i - padding_size] is None:
z[i - padding_size] = z_iq
else:
z[i - padding_size] = tf.concat([z[i - padding_size], z_iq], axis=1)
z = tf.stack(z, axis=1)
values, indices = tf.nn.top_k(z, sorted=False, k=emb_dim)
# highway layer
X = tf.unstack(word_out, axis=1)
Conv_X = tf.unstack(values, axis=1)
X_hat = []
W_t = tf.get_variable("W_t", shape=[emb_dim, emb_dim])
b_t = tf.get_variable("b_t", shape=[emb_dim])
for x, conv_x in zip(X, Conv_X):
T_x = tf.sigmoid(tf.nn.xw_plus_b(x, W_t, b_t))
X_hat.append(tf.multiply(conv_x, T_x) + tf.multiply(x, 1 - T_x))
X_hat = tf.stack(X_hat, axis=1)
emb_set.append(X_hat)
if len(emb_set) > 1:
# 各种字向量直接 concat 起来（字向量、偏旁部首、n-gram、图像信息等）
emb_out = tf.concat(axis=2, values=emb_set)
else:
emb_out = emb_set[0]
# rnn_out 是前向 RNN 的输出和后向 RNN 的输出 concat 之后的值
rnn_out = BiLSTM(rnn_dim, fw_cell=fw_rnn_cell, bw_cell=bw_rnn_cell, p=dr,
name='BiLSTM' + str(bucket), scope='BiRNN')(self.highway(emb_out, "tag"), input_sentences)
# 应用全连接层，Wx+b 得到最后的输出
output = output_wrapper(rnn_out)
# 为什么要 [output] 而不是 output 呢？
self.output.append([output])
self.output_.append([tf.placeholder(tf.int32, [None, bucket], name='tags' + str(bucket))])
self.bucket_dit[bucket] = idx
# language model
lm_rnn_dim = rnn_dim
with tf.variable_scope('LM-BiRNN'):
if gru:
lm_fw_rnn_cell = tf.nn.rnn_cell.GRUCell(lm_rnn_dim)
lm_bw_rnn_cell = tf.nn.rnn_cell.GRUCell(lm_rnn_dim)
else:
lm_fw_rnn_cell = tf.nn.rnn_cell.LSTMCell(lm_rnn_dim, state_is_tuple=True)
lm_bw_rnn_cell = tf.nn.rnn_cell.LSTMCell(lm_rnn_dim, state_is_tuple=True)
if rnn_num > 1:
lm_fw_rnn_cell = tf.nn.rnn_cell.MultiRNNCell([lm_fw_rnn_cell] * rnn_num, state_is_tuple=True)
lm_bw_rnn_cell = tf.nn.rnn_cell.MultiRNNCell([lm_bw_rnn_cell] * rnn_num, state_is_tuple=True)
lm_rnn_output = BiLSTM(lm_rnn_dim, fw_cell=lm_fw_rnn_cell,
bw_cell=lm_bw_rnn_cell, p=dr,
name='LM-BiLSTM' + str(bucket),
scope='LM-BiRNN')(self.highway(emb_set[0]), input_sentences)
lm_output_wrapper = TimeDistributed(
HiddenLayer(lm_rnn_dim * 2, self.nums_chars + 2, activation='linear', name='lm_hidden'),
name='lm_wrapper')
lm_final_output = lm_output_wrapper(lm_rnn_output)
self.lm_predictions.append([lm_final_output])
self.lm_groundtruthes.append([tf.placeholder(tf.int32, [None, bucket], name='lm_targets' + str(bucket))])
print 'Bucket %d, %f seconds' % (idx + 1, time() - t1)
assert \
len(self.input_v) == len(self.output) and \
len(self.output) == len(self.output_) and \
len(self.lm_predictions) == len(self.lm_groundtruthes) and \
len(self.output) == len(self.counts)
self.params = tf.trainable_variables()
self.saver = tf.train.Saver()
def build_model(self, load_model=None):
a = Input(shape=(self.max_length, ), dtype='int32',
name='words_1') # For "premise"
b = Input(shape=(self.max_length, ), dtype='int32',
name='words_2') # For "hypothesis"
# ------- Embedding Layer -------
# Using "Glove" pre-trained embedding matrix as our initial weights
embedding_layer = EmbeddingLayer(self.vocab_size,
self.embedding_size,
self.max_length,
self.hidden_unit,
init_weights=self.embedding_matrix,
dropout=self.dropout_rate,
nr_tune=5000)
embedded_a = embedding_layer(a)
embedded_b = embedding_layer(b)
# ------- BiLSTM Layer -------
# BiLSTM learns to represent a word and its context
encoded_a = BiLSTM_Layer(self.max_length, self.hidden_unit)(embedded_a)
encoded_b = BiLSTM_Layer(self.max_length, self.hidden_unit)(embedded_b)
# ------- Attention Layer -------
attention_ab = Lambda(attention, attention_output,
name='attention')([encoded_a, encoded_b])
# ------- Soft-Alignment Layer -------
# Modeling local inference needs to employ some forms of hard or soft alignment to associate the relevant
# sub-components between a premise and a hypothesis
# Using inter-sentence "alignment" (or attention) to softly align each word to the content of hypothesis (or premise)
align_alpha = Lambda(
attention_softmax3d,
attention_softmax3d_output,
name='soft_alignment_a')([attention_ab, encoded_b])
align_beta = Lambda(attention_softmax3d,
attention_softmax3d_output,
name='soft_alignment_b')([attention_ab, encoded_a])
# ------- Enhancement Layer -------
# Compute the difference and the element-wise product for the tuple < encoded_a, align_a > and < encoded_b, align_b >
# This operation could help sharpen local inference information between elements in the tuples and capture
# inference relationships such as contradiction.
sub_a = Lambda(substract, substract_output,
name='substract_a')([encoded_a, align_alpha])
mul_a = Lambda(multiply, multiply_output,
name='multiply_a')([encoded_a, align_alpha])
sub_b = Lambda(substract, substract_output,
name='substract_b')([encoded_b, align_beta])
mul_b = Lambda(multiply, multiply_output,
name='multiply_b')([encoded_b, align_beta])
m_a = merge([encoded_a, align_alpha, sub_a, mul_a],
mode='concat') # shape=(batch_size, time-steps, 4 * units)
m_b = merge([encoded_b, align_beta, sub_b, mul_b],
mode='concat') # shape=(batch_size, time-steps, 4 * units)
# ------- Composition Layer -------
comp_a = Composition_Layer(self.hidden_unit, self.max_length)(m_a)
comp_b = Composition_Layer(self.hidden_unit, self.max_length)(m_b)
# ------- Pooling Layer -------
preds = Pooling_Layer(self.hidden_unit,
self.n_classes,
dropout=self.dropout_rate,
l2_weight_decay=self.l2_weight_decay)(comp_a,
comp_b)
model = Model(inputs=[a, b], outputs=[preds])
model.compile(optimizer=Adam(lr=self.learning_rate),
loss='binary_crossentropy',
metrics=['accuracy'])
if load_model is not None:
print('Loading pre-trained weights from \'{}\'...'.format(
load_model))
model.load_weights(load_model)
return model
def main_graph(self,
trained_model,
scope,
emb_dim,
gru,
rnn_dim,
rnn_num,
drop_out=0.5,
emb=None,
ngram_embedding=None):
"""
:param trained_model:
:param scope:
:param emb_dim:
:param gru:
:param rnn_dim:
:param rnn_num:
:param drop_out:
:param emb:
:return:
"""
# trained_model: 模型存储路径
if trained_model is not None:
param_dic = {
'nums_chars': self.nums_chars,
'nums_tags': self.nums_tags,
'tag_scheme': self.tag_scheme,
'crf': self.crf,
'emb_dim': emb_dim,
'gru': gru,
'rnn_dim': rnn_dim,
'rnn_num': rnn_num,
'drop_out': drop_out,
'buckets_char': self.buckets_char,
'ngram': self.ngram
}
print "RNN dimension is %d" % rnn_dim
print "RNN number is %d" % rnn_num
print "Character embedding size is %d" % emb_dim
# 存储模型超参数
if self.metric == 'All':
# rindex() 返回子字符串 str 在字符串中最后出现的位置
# 截取模型文件名
pindex = trained_model.rindex('/') + 1
for m in self.all_metrics:
f_model = open(
trained_model[:pindex] + m + '_' +
trained_model[pindex:], 'w')
pickle.dump(param_dic, f_model)
f_model.close()
else:
f_model = open(trained_model, 'w')
pickle.dump(param_dic, f_model)
f_model.close()
# define shared weights and variables
dr = tf.placeholder(tf.float32, [], name='drop_out_holder')
self.drop_out = dr
self.drop_out_v = drop_out
# 字向量层
# 为什么字符数要加 500 ？
# emb_dim 是每个字符的特征向量维度，可以通过命令行参数设置
# weights 表示预训练的字向量，可以通过命令行参数设置
self.emb_layer = EmbeddingLayer(self.nums_chars + 500,
emb_dim,
weights=emb,
name='emb_layer')
if self.ngram is not None:
if ngram_embedding is not None:
assert len(ngram_embedding) == len(self.ngram)
else:
ngram_embedding = [None for _ in range(len(self.ngram))]
for i, n_gram in enumerate(self.ngram):
self.gram_layers.append(
EmbeddingLayer(n_gram + 1000 * (i + 2),
emb_dim,
weights=ngram_embedding[i],
name=str(i + 2) + 'gram_layer'))
# 隐藏层，输入是前向 RNN 的输出加上 后向 RNN 的输出，所以输入维度为 rnn_dim * 2
# 输出维度即标签个数
tag_output_wrapper = TimeDistributed(HiddenLayer(rnn_dim * 2,
self.nums_tags[0],
activation='linear',
name='tag_hidden'),
name='tag_output_wrapper')
if self.char_freq_loss:
freq_output_wrapper = TimeDistributed(HiddenLayer(
rnn_dim * 2, 1, activation='sigmoid', name='freq_hidden'),
name='freq_output_wrapper')
if self.co_train:
lm_fw_wrapper = TimeDistributed(HiddenLayer(rnn_dim,
self.nums_chars + 2,
activation='linear',
name='lm_fw_hidden'),
name='lm_fw_wrapper')
lm_bw_wrapper = TimeDistributed(HiddenLayer(rnn_dim,
self.nums_chars + 2,
activation='linear',
name='lm_bw_hidden'),
name='lm_bw_wrapper')
# define model for each bucket
# 每一个 bucket 中的句子长度不一样，所以需要定义单独的模型
# bucket: bucket 中的句子长度
for idx, bucket in enumerate(self.buckets_char):
if idx == 1:
# scope 是 tf.variable_scope("tagger", reuse=None, initializer=initializer)
# 只需要设置一次 reuse，后面就都 reuse 了
scope.reuse_variables()
t1 = time()
# 输入的句子，one-hot 向量
# shape = （batch_size, 句子长度）
input_sentences = tf.placeholder(tf.int32, [None, bucket],
name='input_' + str(bucket))
self.input_v.append([input_sentences])
emb_set = []
word_out = self.emb_layer(input_sentences)
emb_set.append(word_out)
if self.ngram is not None:
for i in range(len(self.ngram)):
input_g = tf.placeholder(tf.int32, [None, bucket],
name='input_g' + str(i) +
str(bucket))
self.input_v[-1].append(input_g)
gram_out = self.gram_layers[i](input_g)
emb_set.append(gram_out)
if len(emb_set) > 1:
# 各种字向量直接 concat 起来（字向量、偏旁部首、n-gram、图像信息等）
word_embeddings = tf.concat(axis=2, values=emb_set)
else:
word_embeddings = emb_set[0]
# rnn_out 是前向 RNN 的输出和后向 RNN 的输出 concat 之后的值
rnn_out_fw, rnn_out_bw = BiRNN(rnn_dim,
p=dr,
concat_output=False,
gru=gru,
name='BiLSTM' + str(bucket),
scope='Tag-BiRNN')(word_embeddings,
input_sentences)
tag_rnn_out_fw, tag_rnn_out_bw = rnn_out_fw, rnn_out_bw
if self.co_train:
if self.highway_layers > 0:
tag_rnn_out_fw = highway_network(rnn_out_fw,
self.highway_layers,
True,
is_train=True,
scope="tag_fw")
tag_rnn_out_bw = highway_network(rnn_out_bw,
self.highway_layers,
True,
is_train=True,
scope="tag_bw")
tag_rnn_out = tf.concat(values=[tag_rnn_out_fw, tag_rnn_out_bw],
axis=2)
# 应用全连接层，Wx+b 得到最后的输出
output = tag_output_wrapper(tag_rnn_out)
# 为什么要 [output] 而不是 output 呢？
self.output.append([output])
self.output_.append([
tf.placeholder(tf.int32, [None, bucket],
name='tags' + str(bucket))
])
self.bucket_dit[bucket] = idx
if self.co_train:
# language model
lm_rnn_out_fw, lm_rnn_out_bw = rnn_out_fw, rnn_out_bw
if self.highway_layers > 0:
lm_rnn_out_fw = highway_network(rnn_out_fw,
self.highway_layers,
True,
is_train=True,
scope="lm_fw")
lm_rnn_out_bw = highway_network(rnn_out_bw,
self.highway_layers,
True,
is_train=True,
scope="lm_bw")
self.lm_fw_predictions.append([lm_fw_wrapper(lm_rnn_out_fw)])
self.lm_bw_predictions.append([lm_bw_wrapper(lm_rnn_out_bw)])
self.lm_fw_groundtruthes.append([
tf.placeholder(tf.int32, [None, bucket],
name='lm_fw_targets' + str(bucket))
])
self.lm_bw_groundtruthes.append([
tf.placeholder(tf.int32, [None, bucket],
name='lm_bw_targets' + str(bucket))
])
if self.char_freq_loss:
freq_rnn_out_fw, freq_rnn_out_bw = rnn_out_fw, rnn_out_bw
if self.highway_layers > 0:
freq_rnn_out_fw = highway_network(rnn_out_fw,
self.highway_layers,
True,
is_train=True,
scope="freq_fw")
freq_rnn_out_bw = highway_network(rnn_out_bw,
self.highway_layers,
True,
is_train=True,
scope="freq_bw")
freq_rnn_out = tf.concat(
values=[freq_rnn_out_fw, freq_rnn_out_bw], axis=2)
self.char_freq_groundtruthes.append([
tf.placeholder(tf.float32, [None, bucket],
name='freq_targets_%d' % bucket)
])
self.char_freq_predictions.append(
[freq_output_wrapper(freq_rnn_out)])
print 'Bucket %d, %f seconds' % (idx + 1, time() - t1)
assert \
len(self.input_v) == len(self.output) and \
len(self.output) == len(self.output_) and \
len(self.output) == len(self.counts)
self.params = tf.trainable_variables()
self.saver = tf.train.Saver()
