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lstm_att_con.py
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lstm_att_con.py
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import theano
import theano.tensor as T
from theano import shared
from theano.tensor.shared_randomstreams import RandomStreams
import numpy as np
import argparse
import time
import collections
from WordLoader import WordLoader
class AttentionLstm(object):
def __init__(self, wordlist, argv, aspect_num=0):
parser = argparse.ArgumentParser()
parser.add_argument('--name', type=str, default='lstm')
parser.add_argument('--rseed', type=int, default=int(1000 * time.time()) % 19491001)
parser.add_argument('--dim_word', type=int, default=300)
parser.add_argument('--dim_hidden', type=int, default=300)
parser.add_argument('--dim_aspect', type=int, default=100)
parser.add_argument('--grained', type=int, default=3, choices=[3])
parser.add_argument('--regular', type=float, default=0.001)
parser.add_argument('--word_vector', type=str, default='data/glove.840B.300d.txt')
args, _ = parser.parse_known_args(argv)
self.name = args.name
self.srng = RandomStreams(seed=args.rseed)
self.dim_word, self.dim_hidden = args.dim_word, args.dim_hidden
self.dim_aspect = args.dim_aspect
self.grained = args.grained
self.regular = args.regular
self.num = len(wordlist) + 1
self.aspect_num = aspect_num
self.init_param()
self.load_word_vector(args.word_vector, wordlist)
self.init_function()
def init_param(self):
def shared_matrix(dim, name, u=0, b=0):
matrix = self.srng.uniform(dim, low=-u, high=u, dtype=theano.config.floatX) + b
f = theano.function([], matrix)
return theano.shared(f(), name=name)
u = lambda x: 1 / np.sqrt(x)
dimc, dimh, dima = self.dim_word, self.dim_hidden, self.dim_aspect
dim_lstm_para = dimh + dimc + dima
self.Vw = shared_matrix((self.num, dimc), 'Vw', 0.01)
self.Wi = shared_matrix((dimh, dim_lstm_para), 'Wi', u(dimh))
self.Wo = shared_matrix((dimh, dim_lstm_para), 'Wo', u(dimh))
self.Wf = shared_matrix((dimh, dim_lstm_para), 'Wf', u(dimh))
self.Wc = shared_matrix((dimh, dim_lstm_para), 'Wc', u(dimh))
self.bi = shared_matrix((dimh,), 'bi', 0.)
self.bo = shared_matrix((dimh,), 'bo', 0.)
self.bf = shared_matrix((dimh,), 'bf', 0.)
self.bc = shared_matrix((dimh,), 'bc', 0.)
self.Ws = shared_matrix((dimh, self.grained), 'Ws', u(dimh))
self.bs = shared_matrix((self.grained,), 'bs', 0.)
self.h0, self.c0 = np.zeros(dimh, dtype=theano.config.floatX), np.zeros(dimc, dtype=theano.config.floatX)
self.params = [self.Vw, self.Wi, self.Wo, self.Wf, self.Wc, self.bi, self.bo, self.bf, self.bc, self.Ws,
self.bs]
self.Wh = shared_matrix((dimh, dimh), 'Wh', u(dimh))
self.Wv = shared_matrix((dima, dima), 'Wv', u(dimh))
self.w = shared_matrix((dimh + dima,), 'w', 0.)
self.Wp = shared_matrix((dimh, dimh), 'Wp', u(dimh))
self.Wx = shared_matrix((dimh, dimh), 'Wx', u(dimh))
self.params.extend([self.Wh, self.Wv, self.w, self.Wp, self.Wx])
self.Va = shared_matrix((self.aspect_num, dima), 'Va', 0.01)
self.params.extend([self.Va])
def init_function(self):
self.seq_idx = T.lvector()
self.tar_scalar = T.lscalar()
self.solution = T.matrix()
self.seq_matrix = T.take(self.Vw, self.seq_idx, axis=0)
self.tar_vector = T.take(self.Va, self.tar_scalar, axis=0)
h, c = T.zeros_like(self.bf, dtype=theano.config.floatX), T.zeros_like(self.bc, dtype=theano.config.floatX)
def encode(x_t, h_fore, c_fore, tar_vec):
v = T.concatenate([h_fore, x_t, tar_vec])
f_t = T.nnet.sigmoid(T.dot(self.Wf, v) + self.bf)
i_t = T.nnet.sigmoid(T.dot(self.Wi, v) + self.bi)
o_t = T.nnet.sigmoid(T.dot(self.Wo, v) + self.bo)
c_next = f_t * c_fore + i_t * T.tanh(T.dot(self.Wc, v) + self.bc)
h_next = o_t * T.tanh(c_next)
return h_next, c_next
scan_result, _ = theano.scan(fn=encode, sequences=[self.seq_matrix], outputs_info=[h, c],
non_sequences=[self.tar_vector])
embedding = scan_result[0] # embedding in there is a matrix, include[h_1, ..., h_n]
# attention
matrix_aspect = T.zeros_like(embedding, dtype=theano.config.floatX)[:, :self.dim_aspect] + self.tar_vector
hhhh = T.concatenate([T.dot(embedding, self.Wh), T.dot(matrix_aspect, self.Wv)], axis=1)
M_tmp = T.tanh(hhhh)
alpha_tmp = T.nnet.softmax(T.dot(M_tmp, self.w))
r = T.dot(alpha_tmp, embedding)
h_star = T.tanh(T.dot(r, self.Wp) + T.dot(embedding[-1], self.Wx))
embedding = h_star # embedding in there is a vector, represent h_n_star
# dropout
embedding_for_train = embedding * self.srng.binomial(embedding.shape, p=0.5, n=1, dtype=embedding.dtype)
embedding_for_test = embedding * 0.5
self.pred_for_train = T.nnet.softmax(T.dot(embedding_for_train, self.Ws) + self.bs)
self.pred_for_test = T.nnet.softmax(T.dot(embedding_for_test, self.Ws) + self.bs)
self.l2 = sum([T.sum(param ** 2) for param in self.params]) - T.sum(self.Vw ** 2)
self.loss_sen = -T.tensordot(self.solution, T.log(self.pred_for_train), axes=2)
self.loss_l2 = 0.7 * self.l2 * self.regular
self.loss = self.loss_sen + self.loss_l2
grads = T.grad(self.loss, self.params)
self.updates = collections.OrderedDict()
self.grad = {}
for param, grad in zip(self.params, grads):
g = theano.shared(np.asarray(np.zeros_like(param.get_value()), \
dtype=theano.config.floatX))
self.grad[param] = g
self.updates[g] = g + grad
self.func_train = theano.function(
inputs=[self.seq_idx, self.tar_scalar, self.solution, theano.In(h, value=self.h0),
theano.In(c, value=self.c0)],
outputs=[self.loss, self.loss_sen, self.loss_l2],
updates=self.updates,
on_unused_input='warn')
self.func_test = theano.function(
inputs=[self.seq_idx, self.tar_scalar, theano.In(h, value=self.h0), theano.In(c, value=self.c0)],
outputs=self.pred_for_test,
on_unused_input='warn')
def load_word_vector(self, fname, wordlist):
loader = WordLoader()
dic = loader.load_word_vector(fname, wordlist, self.dim_word)
not_found = 0
Vw = self.Vw.get_value()
for word, index in wordlist.items():
try:
Vw[index] = dic[word]
except:
not_found += 1
self.Vw.set_value(Vw)