def create_model(args, maxlen, vocab):
def ortho_reg(weight_matrix):
### orthogonal regularization for aspect embedding matrix ###
w_n = weight_matrix / K.cast(K.epsilon() + K.sqrt(K.sum(K.square(weight_matrix), axis=-1, keepdims=True)), K.floatx())
reg = K.sum(K.square(K.dot(w_n, K.transpose(w_n)) - K.eye((w_n.shape[0]).eval())))
return args.ortho_reg*reg
# 词汇表大小
vocab_size = len(vocab)
##### Inputs #####
# 正例的形状：batch_size * dim, 每个元素是在词汇表中的索引值, 每个句子有多少个词就有多少索引值
# 负例的形状：batch_size * args.neg_size * dim, ditto
# 得到w
sentence_input = Input(batch_shape=(None, maxlen), dtype='int32', name='sentence_input')
neg_input = Input(batch_shape=(None, args.neg_size, maxlen), dtype='int32', name='neg_input')
##### Construct word embedding layer #####
# 嵌入层将正整数（下标）转换为具有固定大小的向量，如[[4],[20]]->[[0.25,0.1],[0.6,-0.2]]
# keras.layers.embeddings.Embedding(input_dim, output_dim, embeddings_initializer='uniform', embeddings_regularizer=None, activity_regularizer=None, embeddings_constraint=None, mask_zero=False, input_length=None)
word_emb = Embedding(vocab_size, args.emb_dim, mask_zero=True, name='word_emb')
##### Compute sentence representation #####
# 计算句子嵌入，这里设计到keras的很多细节，日后还需要深入学习
e_w = word_emb(sentence_input)
y_s = Average()(e_w)
att_weights = Attention(name='att_weights')([e_w, y_s])
z_s = WeightedSum()([e_w, att_weights])
##### Compute representations of negative instances #####
# 计算负例的z_n
e_neg = word_emb(neg_input)
z_n = Average()(e_neg)
##### Reconstruction #####
# 重构过程
p_t = Dense(args.aspect_size)(z_s)
p_t = Activation('softmax', name='p_t')(p_t)
r_s = WeightedAspectEmb(args.aspect_size, args.emb_dim, name='aspect_emb',
W_regularizer=ortho_reg)(p_t)
##### Loss #####
# 损失函数
loss = MaxMargin(name='max_margin')([z_s, z_n, r_s])
model = Model(input=[sentence_input, neg_input], output=loss)
### Word embedding and aspect embedding initialization ######
# 如果定义了emb_path, 就用文件中的数值初始化E矩阵, T使用K-means初始化
if args.emb_path:
from w2vEmbReader import W2VEmbReader as EmbReader
emb_reader = EmbReader(args.emb_path, emb_dim=args.emb_dim)
logger.info('Initializing word embedding matrix')
model.get_layer('word_emb').set_weights(emb_reader.get_emb_matrix_given_vocab(vocab, model.get_layer('word_emb').get_weights()))
logger.info('Initializing aspect embedding matrix as centroid of kmean clusters')
model.get_layer('aspect_emb').W.set_value(emb_reader.get_aspect_matrix(args.aspect_size))
return model
def create_model(args, maxlen, vocab):
def ortho_reg(weight_matrix):
### orthogonal regularization for aspect embedding matrix ###
w_n = weight_matrix / K.cast(K.epsilon() + K.sqrt(K.sum(K.square(weight_matrix), axis=-1, keepdims=True)), K.floatx())
reg = K.sum(K.square(K.dot(w_n, K.transpose(w_n)) - K.eye(w_n.shape[0].value)))
return args.ortho_reg*reg
vocab_size = len(vocab)
##### Inputs #####
sentence_input = Input(shape=(maxlen,), dtype='int32', name='sentence_input')
neg_input = Input(shape=(args.neg_size, maxlen), dtype='int32', name='neg_input')
##### Construct word embedding layer #####
word_emb = Embedding(vocab_size, args.emb_dim, mask_zero=True, name='word_emb')
##### Compute sentence representation #####
e_w = word_emb(sentence_input)
#y_s = LSTM(args.emb_dim, return_sequences=False)(e_w)
y_s = Average()(e_w)
att_weights = Attention(name='att_weights')([e_w, y_s])
z_s = WeightedSum()([e_w, att_weights])
##### Compute representations of negative instances #####
e_neg = word_emb(neg_input)
#z_n = TimeDistributed(LSTM(args.emb_dim, return_sequences=False))(e_neg)
z_n = Average()(e_neg)
##### Reconstruction #####
p_t = Dense(args.aspect_size)(z_s)
p_t = Activation('softmax', name='p_t')(p_t)
r_s = WeightedAspectEmb(args.aspect_size, args.emb_dim, name='aspect_emb',
W_regularizer=ortho_reg)(p_t)
##### Loss #####
loss = MaxMargin(name='max_margin')([z_s, z_n, r_s])
model = Model(inputs=[sentence_input, neg_input], outputs=loss)
### Word embedding and aspect embedding initialization ######
if args.emb_path:
from w2vEmbReader import W2VEmbReader as EmbReader
emb_reader = EmbReader(args.emb_path, emb_dim=args.emb_dim)
logger.info('Initializing word embedding matrix')
# model.get_layer('word_emb').set_weights(emb_reader.get_emb_matrix_given_vocab(vocab, model.get_layer('word_emb').get_weights()[0]))
K.set_value(
model.get_layer('word_emb').embeddings,
emb_reader.get_emb_matrix_given_vocab(vocab, K.get_value(model.get_layer('word_emb').embeddings)))
logger.info('Initializing aspect embedding matrix as centroid of kmean clusters')
K.set_value(
model.get_layer('aspect_emb').W,
emb_reader.get_aspect_matrix(args.aspect_size))
return model
def create_model(args, vocab, num_outputs):
###############################################################################################################################
## Create Model
#
dropout = 0.5
recurrent_dropout = 0.1
vocab_size = len(vocab)
##### Inputs #####
sentence_input = Input(shape=(None, ),
dtype='int32',
name='sentence_input')
word_emb = Embedding(vocab_size,
args.emb_dim,
mask_zero=True,
name='word_emb')
output = word_emb(sentence_input)
print 'use a rnn layer'
output = LSTM(args.rnn_dim,
return_sequences=False,
dropout=dropout,
recurrent_dropout=recurrent_dropout,
name='lstm')(output)
print 'use 0.5 dropout layer'
output = Dropout(0.5)(output)
densed = Dense(num_outputs, name='dense')(output)
probs = Activation('softmax')(densed)
model = Model(inputs=[sentence_input], outputs=probs)
##### Initialization #####
from w2vEmbReader import W2VEmbReader as EmbReader
logger.info('Initializing lookup table')
emb_path = '../glove/%s.txt' % (args.domain)
emb_reader = EmbReader(emb_path, emb_dim=args.emb_dim)
model.get_layer('word_emb').set_weights(
emb_reader.get_emb_matrix_given_vocab(
vocab,
model.get_layer('word_emb').get_weights()))
logger.info(' Done')
return model
if vocab_path:
with open(vocab_path, 'rb') as vocab_file:
vocab = pk.load(vocab_file)
else:
vocab = create_vocab(train_df['text'].values, tokenize_text, to_lower, min_word_freq, emb_words)
vocab_size = len(vocab)
logger.info(' Vocab size: %i' % (vocab_size))
pd.options.mode.chained_assignment = None
train_df.loc[:,'text'] = tokenize_dataset(train_df['text'].values, vocab, tokenize_text, to_lower)
dev_df.loc[:,'text'] = tokenize_dataset(dev_df['text'].values, vocab, tokenize_text, to_lower)
test_df.loc[:,'text'] = tokenize_dataset(test_df['text'].values, vocab, tokenize_text, to_lower)
train_maxlen = train_df['text'].map(len).max()
dev_maxlen = dev_df['text'].map(len).max()
test_maxlen = test_df['text'].map(len).max()
overal_maxlen = max(train_maxlen, dev_maxlen, test_maxlen)
return train_df, dev_df, test_df, vocab, overal_maxlen
if __name__ == '__main__':
from w2vEmbReader import W2VEmbReader as EmbReader
emb_reader = EmbReader('/home/david/data/embed/glove.6B.50d.txt', emb_dim=50)
emb_words = emb_reader.load_words()
train_df, dev_df, test_df, vocab, overal_maxlen, qwks = get_data('/home/david/data/ats/ets/54147', emb_words=emb_words)
print(qwks)
print('Done.')
def create_model(args, maxlen, vocab):
def ortho_reg(weight_matrix):
### orthogonal regularization for aspect embedding matrix ###
w_n = K.l2_normalize(weight_matrix, axis=-1)
reg = K.sum(
K.square(
K.dot(w_n, K.transpose(w_n)) -
K.eye(w_n.get_shape().as_list()[0])))
return args.ortho_reg * reg
vocab_size = len(vocab)
if args.emb_name:
from w2vEmbReader import W2VEmbReader as EmbReader
emb_reader = EmbReader(
os.path.join("..", "preprocessed_data", args.domain),
args.emb_name)
aspect_matrix = emb_reader.get_aspect_matrix(args.aspect_size)
args.aspect_size = emb_reader.aspect_size
args.emb_dim = emb_reader.emb_dim
##### Inputs #####
sentence_input = Input(shape=(maxlen, ),
dtype='int32',
name='sentence_input')
neg_input = Input(shape=(args.neg_size, maxlen),
dtype='int32',
name='neg_input')
##### Construct word embedding layer #####
word_emb = Embedding(vocab_size,
args.emb_dim,
mask_zero=True,
name='word_emb')
#, embeddings_constraint=MaxNorm(10))
##### Compute sentence representation #####
e_w = word_emb(sentence_input)
y_s = Average()(e_w)
att_weights = Attention(name='att_weights')([e_w, y_s])
#W_constraint=MaxNorm(10),
#b_constraint=MaxNorm(10))([e_w, y_s])
z_s = WeightedSum()([e_w, att_weights])
##### Compute representations of negative instances #####
e_neg = word_emb(neg_input)
z_n = Average()(e_neg)
##### Reconstruction #####
p_t = Dense(args.aspect_size)(z_s)
p_t = Activation('softmax', name='p_t')(p_t)
r_s = WeightedAspectEmb(
args.aspect_size,
args.emb_dim,
name='aspect_emb',
#W_constraint=MaxNorm(10),
W_regularizer=ortho_reg)(p_t)
##### Loss #####
loss = MaxMargin(name='max_margin')([z_s, z_n, r_s])
model = Model(inputs=[sentence_input, neg_input], outputs=[loss])
### Word embedding and aspect embedding initialization ######
if args.emb_name:
from w2vEmbReader import W2VEmbReader as EmbReader
logger.info('Initializing word embedding matrix')
embs = model.get_layer('word_emb').embeddings
K.set_value(
embs,
emb_reader.get_emb_matrix_given_vocab(vocab, K.get_value(embs)))
logger.info(
'Initializing aspect embedding matrix as centroid of kmean clusters'
)
K.set_value(model.get_layer('aspect_emb').W, aspect_matrix)
return model
def create_model(args, initial_mean_value, overal_maxlen, vocab):
import keras.backend as K
from keras import layers
from keras.layers import *
from deepats.my_layers import Attention, Conv1DWithMasking, MeanOverTime, TemporalMeanPooling, MeanPool, GlobalMeanPooling
from keras.models import Sequential, Model
from keras.initializers import Constant
###############################################################################################################################
## Create Model
#
vocab_size = len(vocab)
dropout_W = 0.5 # default=0.5
dropout_U = 0.1 # default=0.1
cnn_border_mode='same'
if initial_mean_value.ndim == 0:
initial_mean_value = np.expand_dims(initial_mean_value, axis=1)
num_outputs = len(initial_mean_value)
if args.model_type == 'cls':
raise NotImplementedError
elif args.model_type == 'rwa':
logger.info('Building a RWA model')
from deepats.rwa import RWA
# from deepats.RWACell import RWACell as RWA
model = Sequential()
model.add(Embedding(vocab_size, args.emb_dim))
for i in range(args.stack-1):
model.add(LSTM(args.rnn_dim, return_sequences=True, dropout=dropout_W, recurrent_dropout=dropout_U))
model.add(Dropout(args.dropout_prob))
model.add(RWA(args.rnn_dim))
#model.add(Bidirectional(RWA(args.rnn_dim), merge_mode='ave'))# {'sum', 'mul', 'concat', 'ave'***, None}
model.add(Dropout(args.dropout_prob))
bias_value = (np.log(initial_mean_value) - np.log(1 - initial_mean_value)).astype(K.floatx())
model.add(Dense(num_outputs, bias_initializer=Constant(value=bias_value)))
#model.add(Activation('sigmoid'))
model.add(Activation('tanh'))
model.emb_index = 0
elif args.model_type == 'regp':
logger.info('Building an LSTM REGRESSION model with POOLING')
POOL=2 #2
if POOL==1:
mask_zero=False
else:
mask_zero=True
model = Sequential()
model.add(Embedding(vocab_size, args.emb_dim, mask_zero=mask_zero))
for i in range(args.stack):
model.add(LSTM(args.rnn_dim, return_sequences=True, dropout=dropout_W, recurrent_dropout=dropout_U))
model.add(Dropout(args.dropout_prob))
## MEAN POOLING.
if POOL==1:
model.add(GlobalAveragePooling1D())
elif POOL==2:
model.add(MeanOverTime())#A/B
elif POOL==3:
model.add(TemporalMeanPooling())
elif POOL==4:
model.add(MeanPool())
elif POOL==5:
model.add(GlobalMeanPooling())
bias_value = (np.log(initial_mean_value) - np.log(1 - initial_mean_value)).astype(K.floatx())
model.add(Dense(num_outputs, bias_initializer=Constant(value=bias_value)))
model.add(Activation('sigmoid'))
#model.add(Activation('tanh'))
model.emb_index = 0
elif args.model_type == 'regp_ORIG':
logger.info('Building a REGRESSION model with POOLING')
model = Sequential()
model.add(Embedding(vocab_size, args.emb_dim, mask_zero=True))
if args.cnn_dim > 0:
model.add(Conv1DWithMasking(nb_filter=args.cnn_dim, filter_length=args.cnn_window_size, border_mode=cnn_border_mode, subsample_length=1))
if args.rnn_dim > 0:
model.add(LSTM(args.rnn_dim, return_sequences=True, dropout_W=dropout_W, dropout_U=dropout_U))
if args.dropout_prob > 0:
model.add(Dropout(args.dropout_prob))
if args.aggregation == 'mot':
model.add(MeanOverTime(mask_zero=True))
elif args.aggregation.startswith('att'):
model.add(Attention(op=args.aggregation, activation='tanh', init_stdev=0.01))
model.add(Dense(num_outputs))
if not args.skip_init_bias:
bias_value = (np.log(initial_mean_value) - np.log(1 - initial_mean_value)).astype(K.floatx())
model.layers[-1].b.set_value(bias_value)
model.add(Activation('sigmoid'))
model.emb_index = 0
logger.info(' Done')
###############################################################################################################################
## Initialize embeddings if requested
#
if args.emb_path:
from w2vEmbReader import W2VEmbReader as EmbReader
logger.info('Initializing lookup table')
emb_reader = EmbReader(args.emb_path, emb_dim=args.emb_dim)
emb_reader.load_embeddings(vocab)
emb_wts = emb_reader.get_emb_matrix_given_vocab(vocab, model.layers[model.emb_index].get_weights()[0])
wts = model.layers[model.emb_index].get_weights()
wts[0] = emb_wts
model.layers[model.emb_index].set_weights(wts)
logger.info(' Done')
return model
def create_model(args, kstep, node_size):
def ortho_reg(weight_matrix):
### orthogonal regularization for aspect embedding matrix ###
w_n = weight_matrix / K.cast(K.epsilon() + K.sqrt(K.sum(K.square(weight_matrix), axis=-1, keepdims=True)), K.floatx())
reg = K.sum(K.square(K.dot(w_n, K.transpose(w_n)) - K.eye(w_n.shape[0].eval())))
return args.ortho_reg*reg
##### Inputs #####
sentence_input = Input(shape=(kstep, node_size), dtype='float32', name='sentence_input')
neg_input = Input(shape=(args.neg_size, kstep, node_size), dtype='float32', name='neg_input')
print("sentence_input.ndim", sentence_input.ndim)
print("neg_input.ndim", neg_input.ndim)
e_w = sentence_input
y_s = Average()(sentence_input)
print(y_s.ndim)
print(e_w.ndim)
print(K.int_shape(e_w), K.int_shape(y_s))
att_weights = Attention(name='att_weights')([e_w, y_s])
z_s = WeightedSum()([e_w, att_weights])
print("z_s----------- %d", (z_s.ndim))
##### Compute representations of negative instances #####
#e_neg = word_emb(neg_input)
e_neg = neg_input
z_n = Average()(e_neg)
print("e_neg.ndim")
print(e_neg.ndim)
print("z_n.ndim")
print(z_n.ndim)
##### Reconstruction #####
p_t = Dense(args.aspect_size)(z_s)
p_t = Activation('softmax', name='p_t')(p_t)
r_s = WeightedAspectEmb(args.aspect_size, 2405, name='aspect_emb',
W_regularizer=ortho_reg)(p_t)
##### Loss #####
print("losssssssssssssssssssssssssssssssssssssssssssssssssssssssssss")
print(K.int_shape(z_s), K.int_shape(r_s))
loss = MaxMargin(name='max_margin')([z_s, z_n, r_s])
model = Model(input=[sentence_input, neg_input], output=loss)
### Word embedding and aspect embedding initialization ######
if args.emb_path:
from w2vEmbReader import W2VEmbReader as EmbReader
emb_reader = EmbReader(args.emb_path, emb_dim=args.emb_dim)
logger.info('Initializing word embedding matrix')
model.get_layer('word_emb').W.set_value(emb_reader.get_emb_matrix_given_vocab(vocab, model.get_layer('word_emb').W.get_value()))
logger.info('Initializing aspect embedding matrix as centroid of kmean clusters')
model.get_layer('aspect_emb').W.set_value(emb_reader.get_aspect_matrix(args.aspect_size))
return model
def create_model(args, maxlen, vocab):
def ortho_reg(weight_matrix):
### orthogonal regularization for aspect embedding matrix ###
w_n = K.l2_normalize(weight_matrix, axis=-1) # K表示调用该函数的当前layer
reg = K.sum(
K.square(
K.dot(w_n, K.transpose(w_n)) -
K.eye(w_n.shape[0].value))) # 自身矩阵的内积的平方根-自身特征值 = 越小, 越说明分量为0
return args.ortho_reg * reg # 这东西越小越好, 因为能保证各个特征分的越开
vocab_size = len(vocab)
if args.emb_name: # 获取已经保存的embedding???
from w2vEmbReader import W2VEmbReader as EmbReader
emb_reader = EmbReader(
os.path.join(
"/content/drive/My Drive/Attention-Based-Aspect-Extraction-master",
"preprocessed_data", args.domain), args.emb_name)
aspect_matrix = emb_reader.get_aspect_matrix(args.aspect_size)
args.aspect_size = emb_reader.aspect_size
args.emb_dim = emb_reader.emb_dim
##### Inputs #####
sentence_input = Input(shape=(maxlen, ),
dtype='int32',
name='sentence_input')
neg_input = Input(shape=(args.neg_size, maxlen),
dtype='int32',
name='neg_input')
##### Construct word embedding layer #####
word_emb = Embedding(vocab_size,
args.emb_dim,
mask_zero=True,
name='word_emb',
embeddings_constraint=MaxNorm(10))
##### Compute sentence representation ##### pre-processing 根据attention组合句子
e_w = word_emb(sentence_input) # 将input转换为embedding
y_s = Average()(e_w) # 默认求平均 layer
att_weights = Attention(name='att_weights',
W_constraint=MaxNorm(10),
b_constraint=MaxNorm(10))([e_w,
y_s]) # attention layer
z_s = WeightedSum()([e_w, att_weights]) # encoding layer
##### Compute representations of negative instances ##### 增加准确性的tricks
e_neg = word_emb(neg_input)
z_n = Average()(e_neg)
##### Reconstruction ##### 构建dense层, 希望能够decoding attention sentences的特征
p_t = Dense(args.aspect_size)(z_s)
p_t = Activation('softmax',
name='p_t')(p_t) # softmax一下, nodes数量不改变, 数值被soft了一下
r_s = WeightedAspectEmb(args.aspect_size,
args.emb_dim,
name='aspect_emb',
W_constraint=MaxNorm(10),
W_regularizer=ortho_reg)(
p_t) # 标准化0-10区间, 且正则项为自定义的ortho_reg
##### Loss #####
loss = MaxMargin(name='max_margin')([z_s, z_n,
r_s]) # 自定义loss function??? 这是在做啥???
model = Model(inputs=[sentence_input, neg_input],
outputs=[loss]) # negative input是需要自己分开数据集的吗??
### Word embedding and aspect embedding initialization ######
if args.emb_name:
from w2vEmbReader import W2VEmbReader as EmbReader
logger.info('Initializing word embedding matrix')
embs = model.get_layer('word_emb').embeddings
K.set_value(
embs,
emb_reader.get_emb_matrix_given_vocab(vocab, K.get_value(embs)))
logger.info(
'Initializing aspect embedding matrix as centroid of kmean clusters'
) # 为何初始化要用到kmeans
K.set_value(model.get_layer('aspect_emb').W, aspect_matrix) # r-s
return model
concat_axis=-1)
densed = Dense(1)(merged)
score = Activation('sigmoid')(densed)
model = Model(input=[sequenceQn, sequenceAns], output=score)
# get the WordEmbedding layer index
model.emb_index = 0
model_layer_index = 0
for test in model.layers:
if (test.name == 'QnEmbedding' or test.name == 'AnsEmbedding'):
model.emb_index = model_layer_index
# Initialize embeddings if requested
if emb_path:
logger.info('Initializing lookup table')
emb_reader = EmbReader(emb_path, emb_dim=emb_dim)
model.layers[model.emb_index].W.set_value(
emb_reader.get_emb_matrix_given_vocab(
vocab, model.layers[model.emb_index].W.get_value()))
model_layer_index += 1
if model_type == 'cnnwang2016':
logger.info(
'Building a CNN model (Zhiguo Wang, 2016) with S+,S-,T+,T- as input, and MaxPooling)'
)
from keras.layers import Dense, Dropout, Embedding, LSTM, Input, merge, pooling
assert cnn_dim > 0
cnn_border_mode = 'same'
vocab, train_x, test_x, overall_maxlen = dataset.get_data(args.domain, vocab_size=args.vocab_size, maxlen=args.maxlen)
vocab_inv = {ind:w for w,ind in vocab.items()}
model = Model(args, maxlen, vocab)
sen_gen = sentence_batch_generator(trainx, batch_size)
neg_gen = negative_batch_generator(trainx, batch_size, args.neg_size)
batches_per_epoch = 1000
with tf.Session() as sess:
sess.run(tf.global_variables_initializer())
saver = tf.train.Saver(tf.global_variables())
if args.emb_path:
from w2vEmbReader import W2VEmbReader as EmbReader
emb_reader = EmbReader(args.emb_path, emb_dim = args.emb_dim)
word_emb = sess.run(model.word_emb)
sess.run(tf.assign(model.word_emb, emb_reader.get_emb_matrix_given_vocab(vocab, word_emb)))
sess.run(tf.assign(model.aspect_emb, emb_reader.get_aspect_matrix(args.aspect_size)))
checkpoint_dir = './ckpt/'
min_loss = float('inf')
for ii in range(args.epochs):
loss,max_margin_loss = 0.,0.
for b in range(batches_per_epoch):
def create_model(args, initial_mean_value, overal_maxlen, vocab):
import keras.backend as K
from keras.layers.embeddings import Embedding
from keras.models import Sequential, Model
from keras.layers.core import Dense, Dropout, Activation
from nea.my_layers import Attention, MeanOverTime, Conv1DWithMasking
###############################################################################################################################
## Recurrence unit type
#
if args.recurrent_unit == 'lstm':
from keras.layers.recurrent import LSTM as RNN
elif args.recurrent_unit == 'gru':
from keras.layers.recurrent import GRU as RNN
elif args.recurrent_unit == 'simple':
from keras.layers.recurrent import SimpleRNN as RNN
###############################################################################################################################
## Create Model
#
dropout_W = 0.5 # default=0.5
dropout_U = 0.1 # default=0.1
cnn_border_mode='same'
if initial_mean_value.ndim == 0:
initial_mean_value = np.expand_dims(initial_mean_value, axis=1)
num_outputs = len(initial_mean_value)
if args.model_type == 'cls':
raise NotImplementedError
elif args.model_type == 'reg':
logger.info('Building a REGRESSION model')
model = Sequential()
model.add(Embedding(args.vocab_size, args.emb_dim, mask_zero=True))
if args.cnn_dim > 0:
model.add(Conv1DWithMasking(nb_filter=args.cnn_dim, filter_length=args.cnn_window_size, border_mode=cnn_border_mode, subsample_length=1))
if args.rnn_dim > 0:
model.add(RNN(args.rnn_dim, return_sequences=False, dropout_W=dropout_W, dropout_U=dropout_U))
if args.dropout_prob > 0:
model.add(Dropout(args.dropout_prob))
model.add(Dense(num_outputs))
if not args.skip_init_bias:
bias_value = (np.log(initial_mean_value) - np.log(1 - initial_mean_value)).astype(K.floatx())
model.layers[-1].bias = bias_value
model.add(Activation('sigmoid'))
model.emb_index = 0
elif args.model_type == 'regp':
logger.info('Building a REGRESSION model with POOLING')
model = Sequential()
model.add(Embedding(args.vocab_size, args.emb_dim, mask_zero=True))
if args.cnn_dim > 0:
model.add(Conv1DWithMasking(nb_filter=args.cnn_dim, filter_length=args.cnn_window_size, border_mode=cnn_border_mode, subsample_length=1))
if args.rnn_dim > 0:
model.add(RNN(args.rnn_dim, return_sequences=True, dropout_W=dropout_W, dropout_U=dropout_U))
if args.dropout_prob > 0:
model.add(Dropout(args.dropout_prob))
if args.aggregation == 'mot':
model.add(MeanOverTime(mask_zero=True))
elif args.aggregation.startswith('att'):
model.add(Attention(op=args.aggregation, activation='tanh', init_stdev=0.01))
model.add(Dense(num_outputs))
if not args.skip_init_bias:
bias_value = (np.log(initial_mean_value) - np.log(1 - initial_mean_value)).astype(K.floatx())
model.layers[-1].bias = bias_value
model.add(Activation('sigmoid'))
model.emb_index = 0
elif args.model_type == 'breg':
logger.info('Building a BIDIRECTIONAL REGRESSION model')
from keras.layers import Dense, Dropout, Embedding, LSTM, Input, merge
model = Sequential()
sequence = Input(shape=(overal_maxlen,), dtype='int32')
output = Embedding(args.vocab_size, args.emb_dim, mask_zero=True)(sequence)
if args.cnn_dim > 0:
output = Conv1DWithMasking(nb_filter=args.cnn_dim, filter_length=args.cnn_window_size, border_mode=cnn_border_mode, subsample_length=1)(output)
if args.rnn_dim > 0:
forwards = RNN(args.rnn_dim, return_sequences=False, dropout_W=dropout_W, dropout_U=dropout_U)(output)
backwards = RNN(args.rnn_dim, return_sequences=False, dropout_W=dropout_W, dropout_U=dropout_U, go_backwards=True)(output)
if args.dropout_prob > 0:
forwards = Dropout(args.dropout_prob)(forwards)
backwards = Dropout(args.dropout_prob)(backwards)
merged = merge([forwards, backwards], mode='concat', concat_axis=-1)
densed = Dense(num_outputs)(merged)
if not args.skip_init_bias:
raise NotImplementedError
score = Activation('sigmoid')(densed)
model = Model(input=sequence, output=score)
model.emb_index = 1
elif args.model_type == 'bregp':
logger.info('Building a BIDIRECTIONAL REGRESSION model with POOLING')
from keras.layers import Dense, Dropout, Embedding, LSTM, Input, merge
model = Sequential()
sequence = Input(shape=(overal_maxlen,), dtype='int32')
output = Embedding(args.vocab_size, args.emb_dim, mask_zero=True)(sequence)
if args.cnn_dim > 0:
output = Conv1DWithMasking(nb_filter=args.cnn_dim, filter_length=args.cnn_window_size, border_mode=cnn_border_mode, subsample_length=1)(output)
if args.rnn_dim > 0:
forwards = RNN(args.rnn_dim, return_sequences=True, dropout_W=dropout_W, dropout_U=dropout_U)(output)
backwards = RNN(args.rnn_dim, return_sequences=True, dropout_W=dropout_W, dropout_U=dropout_U, go_backwards=True)(output)
if args.dropout_prob > 0:
forwards = Dropout(args.dropout_prob)(forwards)
backwards = Dropout(args.dropout_prob)(backwards)
forwards_mean = MeanOverTime(mask_zero=True)(forwards)
backwards_mean = MeanOverTime(mask_zero=True)(backwards)
merged = merge([forwards_mean, backwards_mean], mode='concat', concat_axis=-1)
densed = Dense(num_outputs)(merged)
if not args.skip_init_bias:
raise NotImplementedError
score = Activation('sigmoid')(densed)
model = Model(input=sequence, output=score)
model.emb_index = 1
logger.info(' Done')
###############################################################################################################################
## Initialize embeddings if requested
#
if args.emb_path:
from w2vEmbReader import W2VEmbReader as EmbReader
logger.info('Initializing lookup table')
emb_reader = EmbReader(args.emb_path, emb_dim=args.emb_dim)
model.layers[model.emb_index].set_weights(emb_reader.get_emb_matrix_given_vocab(vocab, model.layers[model.emb_index].get_weights()))
logger.info(' Done')
return model
def create_model(args, vocab, num_outputs, overal_maxlen, maxlen_aspect):
###############################################################################################################################
## Recurrence unit type
#
if args.recurrent_unit == 'lstm':
from keras.layers.recurrent import LSTM as RNN
elif args.recurrent_unit == 'gru':
from keras.layers.recurrent import GRU as RNN
elif args.recurrent_unit == 'simple':
from keras.layers.recurrent import SimpleRNN as RNN
###############################################################################################################################
## Create Model
#
dropout = args.dropout_W
recurrent_dropout = args.dropout_U
vocab_size = len(vocab)
logger.info('Building a LSTM attention model to predict term/aspect sentiment')
print '\n\n'
##### Inputs #####
sentence_input = Input(shape=(overal_maxlen,), dtype='int32', name='sentence_input')
aspect_input = Input(shape=(maxlen_aspect,), dtype='int32', name='aspect_input')
pretrain_input = Input(shape=(None,), dtype='int32', name='pretrain_input')
##### construct word embedding layer #####
word_emb = Embedding(vocab_size, args.emb_dim, mask_zero=True, name='word_emb')
### represent aspect as averaged word embedding ###
print 'use average term embs as aspect embedding'
aspect_term_embs = word_emb(aspect_input)
aspect_embs = Average(mask_zero=True, name='aspect_emb')(aspect_term_embs)
### sentence representation ###
sentence_output = word_emb(sentence_input)
pretrain_output = word_emb(pretrain_input)
print 'use a rnn layer'
rnn = RNN(args.rnn_dim, return_sequences=True, dropout=dropout, recurrent_dropout=recurrent_dropout, name='lstm')
sentence_output = rnn(sentence_output)
pretrain_output = rnn(pretrain_output)
print 'use content attention to get term weights'
att_weights = Attention(name='att_weights')([sentence_output, aspect_embs])
sentence_output = WeightedSum()([sentence_output, att_weights])
pretrain_output = Average(mask_zero=True)(pretrain_output)
if args.dropout_prob > 0:
print 'use dropout layer'
sentence_output = Dropout(args.dropout_prob)(sentence_output)
pretrain_output = Dropout(args.dropout_prob)(pretrain_output)
sentence_output = Dense(num_outputs, name='dense_1')(sentence_output)
pretrain_output = Dense(num_outputs, name='dense_2')(pretrain_output)
aspect_probs = Activation('softmax', name='aspect_model')(sentence_output)
doc_probs = Activation('softmax', name='pretrain_model')(pretrain_output)
model = Model(inputs=[sentence_input, aspect_input, pretrain_input], outputs=[aspect_probs, doc_probs])
logger.info(' Done')
###############################################################################################################################
## Initialize embeddings if requested
#
if args.is_pretrain:
import pickle
print 'Set embedding, lstm, and dense weights from pre-trained models'
if args.domain == 'lt':
f_1 = open('../pretrained_weights/lstm_weights_lt%.1f.pkl'%(args.percetage), 'rb')
f_2 = open('../pretrained_weights/dense_weights_lt%.1f.pkl'%(args.percetage), 'rb')
else:
f_1 = open('../pretrained_weights/lstm_weights_res%.1f.pkl'%(args.percetage), 'rb')
f_2 = open('../pretrained_weights/dense_weights_res%.1f.pkl'%(args.percetage), 'rb')
lstm_weights = pickle.load(f_1)
dense_weights = pickle.load(f_2)
model.get_layer('lstm').set_weights(lstm_weights)
model.get_layer('dense_1').set_weights(dense_weights)
model.get_layer('dense_2').set_weights(dense_weights)
from w2vEmbReader import W2VEmbReader as EmbReader
logger.info('Initializing lookup table')
emb_path = '../glove/%s.txt'%(args.domain)
emb_reader = EmbReader(args, emb_path)
model.get_layer('word_emb').set_weights(emb_reader.get_emb_matrix_given_vocab(vocab, model.get_layer('word_emb').get_weights()))
logger.info(' Done')
return model
def create_model(args, initial_mean_value, overal_maxlen, vocab):
import keras.backend as K
from keras.layers.embeddings import Embedding
from keras.models import Sequential, Model
from keras.layers.core import Dense, Dropout, Activation
from nea.my_layers import Attention, MeanOverTime, Conv1DWithMasking
###############################################################################################################################
## Recurrence unit type
#
if args.recurrent_unit == 'lstm':
from keras.layers.recurrent import LSTM as RNN
elif args.recurrent_unit == 'gru':
from keras.layers.recurrent import GRU as RNN
elif args.recurrent_unit == 'simple':
from keras.layers.recurrent import SimpleRNN as RNN
###############################################################################################################################
## Create Model
#
dropout_W = 0.5 # default=0.5
dropout_U = 0.1 # default=0.1
cnn_border_mode = 'same'
if initial_mean_value.ndim == 0: #expand the dims
initial_mean_value = np.expand_dims(initial_mean_value, axis=1)
num_outputs = len(initial_mean_value) #预测的分数种类数
if args.model_type == 'cls':
raise NotImplementedError
#embedding-->cnn-->rnn(return_sequence=false)-->dropout-->dense-->sigmoid
elif args.model_type == 'reg':
logger.info('Building a REGRESSION model')
model = Sequential()
#确定是否将输入中的‘0’看作是应该被忽略的‘填充’（padding）值设置为True的话，模型中后续的层必须都支持masking，否则会抛出异常。
#如果该值为True，则下标0在字典中不可用，input_dim应设置为|vocabulary| + 1
#此处，input层省略是因为input_length有默认值
model.add(Embedding(args.vocab_size, args.emb_dim, mask_zero=True))
if args.cnn_dim > 0: #border_mode==padding?? subsample_length==pooling?? where is the activation??
model.add(
Conv1DWithMasking(nb_filter=args.cnn_dim,
filter_length=args.cnn_window_size,
border_mode=cnn_border_mode,
subsample_length=1))
if args.rnn_dim > 0: #return_sequence 只返回最后一个 state
model.add(
RNN(args.rnn_dim,
return_sequences=False,
dropout_W=dropout_W,
dropout_U=dropout_U))
if args.dropout_prob > 0:
model.add(Dropout(args.dropout_prob))
model.add(Dense(num_outputs))
if not args.skip_init_bias: #初始化最后一层layer的bias
bias_value = (np.log(initial_mean_value) -
np.log(1 - initial_mean_value)).astype(K.floatx())
model.layers[-1].b.set_value(bias_value)
model.add(Activation('sigmoid')) #输出区间为（0，1）
#设置model的embed层的序号，方便后续用预训练词向量的初始化，model的所有层都存在 model.layers 里
model.emb_index = 0
#embedding-->cnn-->rnn(return_sequence=true)-->dropout-->MeanoverTime or Attention(mean or sum)-->Dense-->sigmoid
elif args.model_type == 'regp':
logger.info('Building a REGRESSION model with POOLING')
model = Sequential()
model.add(Embedding(args.vocab_size, args.emb_dim, mask_zero=True))
if args.cnn_dim > 0:
model.add(
Conv1DWithMasking(nb_filter=args.cnn_dim,
filter_length=args.cnn_window_size,
border_mode=cnn_border_mode,
subsample_length=1))
if args.rnn_dim > 0:
model.add(
RNN(args.rnn_dim,
return_sequences=True,
dropout_W=dropout_W,
dropout_U=dropout_U))
if args.dropout_prob > 0:
model.add(Dropout(args.dropout_prob))
if args.aggregation == 'mot':
model.add(MeanOverTime(mask_zero=True))
elif args.aggregation.startswith('att'):
model.add(
Attention(op=args.aggregation,
activation='tanh',
init_stdev=0.01))
model.add(Dense(num_outputs))
if not args.skip_init_bias:
bias_value = (np.log(initial_mean_value) -
np.log(1 - initial_mean_value)).astype(K.floatx())
model.layers[-1].b.set_value(bias_value)
model.add(Activation('sigmoid'))
model.emb_index = 0
#embedding-->cnn-->birnn(return_sequence=false)-->dropout-->merge(concat the forRnn&backRnn)-->dense-->sigmoid
elif args.model_type == 'breg':
logger.info('Building a BIDIRECTIONAL REGRESSION model')
from keras.layers import Dense, Dropout, Embedding, LSTM, Input, merge
model = Sequential() #这句应该是多余的
sequence = Input(shape=(overal_maxlen, ), dtype='int32')
output = Embedding(args.vocab_size, args.emb_dim,
mask_zero=True)(sequence)
if args.cnn_dim > 0:
output = Conv1DWithMasking(nb_filter=args.cnn_dim,
filter_length=args.cnn_window_size,
border_mode=cnn_border_mode,
subsample_length=1)(output)
if args.rnn_dim > 0:
forwards = RNN(args.rnn_dim,
return_sequences=False,
dropout_W=dropout_W,
dropout_U=dropout_U)(output)
backwards = RNN(args.rnn_dim,
return_sequences=False,
dropout_W=dropout_W,
dropout_U=dropout_U,
go_backwards=True)(output)
if args.dropout_prob > 0:
forwards = Dropout(args.dropout_prob)(forwards)
backwards = Dropout(args.dropout_prob)(backwards)
merged = merge([forwards, backwards], mode='concat', concat_axis=-1)
densed = Dense(num_outputs)(merged)
if not args.skip_init_bias:
raise NotImplementedError
score = Activation('sigmoid')(densed)
model = Model(input=sequence, output=score)
model.emb_index = 1
#embedding-->cnn-->biRnn(return_sequence=true)-->dropout-->meanOverTime-->merge(concat)-->dense-->sigmoid
elif args.model_type == 'bregp':
logger.info('Building a BIDIRECTIONAL REGRESSION model with POOLING')
from keras.layers import Dense, Dropout, Embedding, LSTM, Input, merge
model = Sequential() #多余的
sequence = Input(shape=(overal_maxlen, ), dtype='int32')
output = Embedding(args.vocab_size, args.emb_dim,
mask_zero=True)(sequence)
if args.cnn_dim > 0:
output = Conv1DWithMasking(nb_filter=args.cnn_dim,
filter_length=args.cnn_window_size,
border_mode=cnn_border_mode,
subsample_length=1)(output)
if args.rnn_dim > 0:
forwards = RNN(args.rnn_dim,
return_sequences=True,
dropout_W=dropout_W,
dropout_U=dropout_U)(output)
backwards = RNN(args.rnn_dim,
return_sequences=True,
dropout_W=dropout_W,
dropout_U=dropout_U,
go_backwards=True)(output)
if args.dropout_prob > 0:
forwards = Dropout(args.dropout_prob)(forwards)
backwards = Dropout(args.dropout_prob)(backwards)
forwards_mean = MeanOverTime(mask_zero=True)(forwards)
backwards_mean = MeanOverTime(mask_zero=True)(backwards)
merged = merge([forwards_mean, backwards_mean],
mode='concat',
concat_axis=-1)
densed = Dense(num_outputs)(merged)
if not args.skip_init_bias:
raise NotImplementedError
score = Activation('sigmoid')(densed)
model = Model(input=sequence, output=score)
model.emb_index = 1
logger.info(' Done')
###############################################################################################################################
## Initialize embeddings if requested
#
if args.emb_path:
from w2vEmbReader import W2VEmbReader as EmbReader
logger.info('Initializing lookup table')
emb_reader = EmbReader(args.emb_path, emb_dim=args.emb_dim)
model.layers[model.emb_index].W.set_value(
emb_reader.get_emb_matrix_given_vocab(
vocab, model.layers[model.emb_index].W.get_value()))
logger.info(' Done')
return model
