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models.py
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# Copyright (c) 2017-present, Facebook, Inc.
# All rights reserved.
#
# This source code is licensed under the license found in the
# LICENSE file in the root directory of this source tree.
#
"""
This file contains the definition of encoders used in https://arxiv.org/pdf/1705.02364.pdf
"""
import numpy as np
import time
import torch
from torch.autograd import Variable
import torch.nn as nn
"""
BLSTM (max/mean) encoder
"""
class InferSent(nn.Module):
def __init__(self, config):
super(InferSent, self).__init__()
self.bsize = config['bsize']
self.word_emb_dim = config['word_emb_dim']
self.enc_lstm_dim = config['enc_lstm_dim']
self.pool_type = config['pool_type']
self.dpout_model = config['dpout_model']
self.version = 1 if 'version' not in config else config['version']
self.enc_lstm = nn.LSTM(self.word_emb_dim, self.enc_lstm_dim, 1,
bidirectional=True, dropout=self.dpout_model)
assert self.version in [1, 2]
if self.version == 1:
self.bos = '<s>'
self.eos = '</s>'
self.max_pad = True
self.moses_tok = False
elif self.version == 2:
self.bos = '<p>'
self.eos = '</p>'
self.max_pad = False
self.moses_tok = True
def is_cuda(self):
# either all weights are on cpu or they are on gpu
return 'cuda' in str(type(self.enc_lstm.bias_hh_l0.data))
def forward(self, sent_tuple):
# sent_len: [max_len, ..., min_len] (bsize)
# sent: Variable(seqlen x bsize x worddim)
sent, sent_len = sent_tuple
# Sort by length (keep idx)
sent_len_sorted, idx_sort = np.sort(sent_len)[::-1], np.argsort(-sent_len)
idx_unsort = np.argsort(idx_sort)
idx_sort = torch.from_numpy(idx_sort).cuda() if self.is_cuda() \
else torch.from_numpy(idx_sort)
sent = sent.index_select(1, Variable(idx_sort))
# Handling padding in Recurrent Networks
sent_packed = nn.utils.rnn.pack_padded_sequence(sent, sent_len_sorted)
sent_output = self.enc_lstm(sent_packed)[0] # seqlen x batch x 2*nhid
sent_output = nn.utils.rnn.pad_packed_sequence(sent_output)[0]
# Un-sort by length
idx_unsort = torch.from_numpy(idx_unsort).cuda() if self.is_cuda() \
else torch.from_numpy(idx_unsort)
sent_output = sent_output.index_select(1, Variable(idx_unsort))
# Pooling
if self.pool_type == "mean":
sent_len = Variable(torch.FloatTensor(sent_len.copy())).unsqueeze(1).cuda()
emb = torch.sum(sent_output, 0).squeeze(0)
emb = emb / sent_len.expand_as(emb)
elif self.pool_type == "max":
if not self.max_pad:
sent_output[sent_output == 0] = -1e9
emb = torch.max(sent_output, 0)[0]
if emb.ndimension() == 3:
emb = emb.squeeze(0)
assert emb.ndimension() == 2
return emb
def set_w2v_path(self, w2v_path):
self.w2v_path = w2v_path
def get_word_dict(self, sentences, tokenize=True):
# create vocab of words
word_dict = {}
sentences = [s.split() if not tokenize else self.tokenize(s) for s in sentences]
for sent in sentences:
for word in sent:
if word not in word_dict:
word_dict[word] = ''
word_dict[self.bos] = ''
word_dict[self.eos] = ''
return word_dict
def get_w2v(self, word_dict):
assert hasattr(self, 'w2v_path'), 'w2v path not set'
# create word_vec with w2v vectors
word_vec = {}
with open(self.w2v_path) as f:
for line in f:
word, vec = line.split(' ', 1)
if word in word_dict:
word_vec[word] = np.fromstring(vec, sep=' ')
print('Found %s(/%s) words with w2v vectors' % (len(word_vec), len(word_dict)))
return word_vec
def get_w2v_k(self, K):
assert hasattr(self, 'w2v_path'), 'w2v path not set'
# create word_vec with k first w2v vectors
k = 0
word_vec = {}
with open(self.w2v_path) as f:
for line in f:
word, vec = line.split(' ', 1)
if k <= K:
word_vec[word] = np.fromstring(vec, sep=' ')
k += 1
if k > K:
if word in [self.bos, self.eos]:
word_vec[word] = np.fromstring(vec, sep=' ')
if k > K and all([w in word_vec for w in [self.bos, self.eos]]):
break
return word_vec
def build_vocab(self, sentences, tokenize=True):
assert hasattr(self, 'w2v_path'), 'w2v path not set'
word_dict = self.get_word_dict(sentences, tokenize)
self.word_vec = self.get_w2v(word_dict)
print('Vocab size : %s' % (len(self.word_vec)))
# build w2v vocab with k most frequent words
def build_vocab_k_words(self, K):
assert hasattr(self, 'w2v_path'), 'w2v path not set'
self.word_vec = self.get_w2v_k(K)
print('Vocab size : %s' % (K))
def update_vocab(self, sentences, tokenize=True):
assert hasattr(self, 'w2v_path'), 'warning : w2v path not set'
assert hasattr(self, 'word_vec'), 'build_vocab before updating it'
word_dict = self.get_word_dict(sentences, tokenize)
# keep only new words
for word in self.word_vec:
if word in word_dict:
del word_dict[word]
# udpate vocabulary
if word_dict:
new_word_vec = self.get_w2v(word_dict)
self.word_vec.update(new_word_vec)
else:
new_word_vec = []
print('New vocab size : %s (added %s words)'% (len(self.word_vec), len(new_word_vec)))
def get_batch(self, batch):
# sent in batch in decreasing order of lengths
# batch: (bsize, max_len, word_dim)
embed = np.zeros((len(batch[0]), len(batch), self.word_emb_dim))
for i in range(len(batch)):
for j in range(len(batch[i])):
embed[j, i, :] = self.word_vec[batch[i][j]]
return torch.FloatTensor(embed)
def tokenize(self, s):
from nltk.tokenize import word_tokenize
if self.moses_tok:
s = ' '.join(word_tokenize(s))
s = s.replace(" n't ", "n 't ") # HACK to get ~MOSES tokenization
return s.split()
else:
return word_tokenize(s)
def prepare_samples(self, sentences, bsize, tokenize, verbose):
sentences = [[self.bos] + s.split() + [self.eos] if not tokenize else
[self.bos] + self.tokenize(s) + [self.eos] for s in sentences]
n_w = np.sum([len(x) for x in sentences])
# filters words without w2v vectors
for i in range(len(sentences)):
s_f = [word for word in sentences[i] if word in self.word_vec]
if not s_f:
import warnings
warnings.warn('No words in "%s" (idx=%s) have w2v vectors. \
Replacing by "</s>"..' % (sentences[i], i))
s_f = [self.eos]
sentences[i] = s_f
lengths = np.array([len(s) for s in sentences])
n_wk = np.sum(lengths)
if verbose:
print('Nb words kept : %s/%s (%.1f%s)' % (
n_wk, n_w, 100.0 * n_wk / n_w, '%'))
# sort by decreasing length
lengths, idx_sort = np.sort(lengths)[::-1], np.argsort(-lengths)
sentences = np.array(sentences)[idx_sort]
return sentences, lengths, idx_sort
def encode(self, sentences, bsize=64, tokenize=True, verbose=False):
tic = time.time()
sentences, lengths, idx_sort = self.prepare_samples(
sentences, bsize, tokenize, verbose)
embeddings = []
for stidx in range(0, len(sentences), bsize):
batch = Variable(self.get_batch(
sentences[stidx:stidx + bsize]), volatile=True)
if self.is_cuda():
batch = batch.cuda()
batch = self.forward(
(batch, lengths[stidx:stidx + bsize])).data.cpu().numpy()
embeddings.append(batch)
embeddings = np.vstack(embeddings)
# unsort
idx_unsort = np.argsort(idx_sort)
embeddings = embeddings[idx_unsort]
if verbose:
print('Speed : %.1f sentences/s (%s mode, bsize=%s)' % (
len(embeddings)/(time.time()-tic),
'gpu' if self.is_cuda() else 'cpu', bsize))
return embeddings
def visualize(self, sent, tokenize=True):
sent = sent.split() if not tokenize else self.tokenize(sent)
sent = [[self.bos] + [word for word in sent if word in self.word_vec] + [self.eos]]
if ' '.join(sent[0]) == '%s %s' % (self.bos, self.eos):
import warnings
warnings.warn('No words in "%s" have w2v vectors. Replacing \
by "%s %s"..' % (sent, self.bos, self.eos))
batch = Variable(self.get_batch(sent), volatile=True)
if self.is_cuda():
batch = batch.cuda()
output = self.enc_lstm(batch)[0]
output, idxs = torch.max(output, 0)
# output, idxs = output.squeeze(), idxs.squeeze()
idxs = idxs.data.cpu().numpy()
argmaxs = [np.sum((idxs == k)) for k in range(len(sent[0]))]
# visualize model
import matplotlib.pyplot as plt
x = range(len(sent[0]))
y = [100.0 * n / np.sum(argmaxs) for n in argmaxs]
plt.xticks(x, sent[0], rotation=45)
plt.bar(x, y)
plt.ylabel('%')
plt.title('Visualisation of words importance')
plt.show()
return output, idxs
"""
BiGRU encoder (first/last hidden states)
"""
class BGRUlastEncoder(nn.Module):
def __init__(self, config):
super(BGRUlastEncoder, self).__init__()
self.bsize = config['bsize']
self.word_emb_dim = config['word_emb_dim']
self.enc_lstm_dim = config['enc_lstm_dim']
self.pool_type = config['pool_type']
self.dpout_model = config['dpout_model']
self.enc_lstm = nn.GRU(self.word_emb_dim, self.enc_lstm_dim, 1,
bidirectional=True, dropout=self.dpout_model)
self.init_lstm = Variable(torch.FloatTensor(2, self.bsize,
self.enc_lstm_dim).zero_()).cuda()
def forward(self, sent_tuple):
# sent_len: [max_len, ..., min_len] (batch)
# sent: Variable(seqlen x batch x worddim)
sent, sent_len = sent_tuple
bsize = sent.size(1)
self.init_lstm = self.init_lstm if bsize == self.init_lstm.size(1) else \
Variable(torch.FloatTensor(2, bsize, self.enc_lstm_dim).zero_()).cuda()
# Sort by length (keep idx)
sent_len, idx_sort = np.sort(sent_len)[::-1], np.argsort(-sent_len)
sent = sent.index_select(1, Variable(torch.cuda.LongTensor(idx_sort)))
# Handling padding in Recurrent Networks
sent_packed = nn.utils.rnn.pack_padded_sequence(sent, sent_len)
_, hn = self.enc_lstm(sent_packed, self.init_lstm)
emb = torch.cat((hn[0], hn[1]), 1) # batch x 2*nhid
# Un-sort by length
idx_unsort = np.argsort(idx_sort)
emb = emb.index_select(0, Variable(torch.cuda.LongTensor(idx_unsort)))
return emb
"""
BLSTM encoder with projection after BiLSTM
"""
class BLSTMprojEncoder(nn.Module):
def __init__(self, config):
super(BLSTMprojEncoder, self).__init__()
self.bsize = config['bsize']
self.word_emb_dim = config['word_emb_dim']
self.enc_lstm_dim = config['enc_lstm_dim']
self.pool_type = config['pool_type']
self.dpout_model = config['dpout_model']
self.enc_lstm = nn.LSTM(self.word_emb_dim, self.enc_lstm_dim, 1,
bidirectional=True, dropout=self.dpout_model)
self.init_lstm = Variable(torch.FloatTensor(2, self.bsize,
self.enc_lstm_dim).zero_()).cuda()
self.proj_enc = nn.Linear(2*self.enc_lstm_dim, 2*self.enc_lstm_dim,
bias=False)
def forward(self, sent_tuple):
# sent_len: [max_len, ..., min_len] (batch)
# sent: Variable(seqlen x batch x worddim)
sent, sent_len = sent_tuple
bsize = sent.size(1)
self.init_lstm = self.init_lstm if bsize == self.init_lstm.size(1) else \
Variable(torch.FloatTensor(2, bsize, self.enc_lstm_dim).zero_()).cuda()
# Sort by length (keep idx)
sent_len, idx_sort = np.sort(sent_len)[::-1], np.argsort(-sent_len)
sent = sent.index_select(1, Variable(torch.cuda.LongTensor(idx_sort)))
# Handling padding in Recurrent Networks
sent_packed = nn.utils.rnn.pack_padded_sequence(sent, sent_len)
sent_output = self.enc_lstm(sent_packed,
(self.init_lstm, self.init_lstm))[0]
# seqlen x batch x 2*nhid
sent_output = nn.utils.rnn.pad_packed_sequence(sent_output)[0]
# Un-sort by length
idx_unsort = np.argsort(idx_sort)
sent_output = sent_output.index_select(1,
Variable(torch.cuda.LongTensor(idx_unsort)))
sent_output = self.proj_enc(sent_output.view(-1,
2*self.enc_lstm_dim)).view(-1, bsize, 2*self.enc_lstm_dim)
# Pooling
if self.pool_type == "mean":
sent_len = Variable(torch.FloatTensor(sent_len)).unsqueeze(1).cuda()
emb = torch.sum(sent_output, 0).squeeze(0)
emb = emb / sent_len.expand_as(emb)
elif self.pool_type == "max":
emb = torch.max(sent_output, 0)[0].squeeze(0)
return emb
"""
LSTM encoder
"""
class LSTMEncoder(nn.Module):
def __init__(self, config):
super(LSTMEncoder, self).__init__()
self.bsize = config['bsize']
self.word_emb_dim = config['word_emb_dim']
self.enc_lstm_dim = config['enc_lstm_dim']
self.pool_type = config['pool_type']
self.dpout_model = config['dpout_model']
self.enc_lstm = nn.LSTM(self.word_emb_dim, self.enc_lstm_dim, 1,
bidirectional=False, dropout=self.dpout_model)
self.init_lstm = Variable(torch.FloatTensor(1, self.bsize,
self.enc_lstm_dim).zero_()).cuda()
def forward(self, sent_tuple):
# sent_len [max_len, ..., min_len] (batch) | sent Variable(seqlen x batch x worddim)
sent, sent_len = sent_tuple
bsize = sent.size(1)
self.init_lstm = self.init_lstm if bsize == self.init_lstm.size(1) else \
Variable(torch.FloatTensor(1, bsize, self.enc_lstm_dim).zero_()).cuda()
# Sort by length (keep idx)
sent_len, idx_sort = np.sort(sent_len)[::-1], np.argsort(-sent_len)
sent = sent.index_select(1, Variable(torch.cuda.LongTensor(idx_sort)))
# Handling padding in Recurrent Networks
sent_packed = nn.utils.rnn.pack_padded_sequence(sent, sent_len)
sent_output = self.enc_lstm(sent_packed, (self.init_lstm,
self.init_lstm))[1][0].squeeze(0) # batch x 2*nhid
# Un-sort by length
idx_unsort = np.argsort(idx_sort)
emb = sent_output.index_select(0, Variable(torch.cuda.LongTensor(idx_unsort)))
return emb
"""
GRU encoder
"""
class GRUEncoder(nn.Module):
def __init__(self, config):
super(GRUEncoder, self).__init__()
self.bsize = config['bsize']
self.word_emb_dim = config['word_emb_dim']
self.enc_lstm_dim = config['enc_lstm_dim']
self.pool_type = config['pool_type']
self.dpout_model = config['dpout_model']
self.enc_lstm = nn.GRU(self.word_emb_dim, self.enc_lstm_dim, 1,
bidirectional=False, dropout=self.dpout_model)
self.init_lstm = Variable(torch.FloatTensor(1, self.bsize,
self.enc_lstm_dim).zero_()).cuda()
def forward(self, sent_tuple):
# sent_len: [max_len, ..., min_len] (batch)
# sent: Variable(seqlen x batch x worddim)
sent, sent_len = sent_tuple
bsize = sent.size(1)
self.init_lstm = self.init_lstm if bsize == self.init_lstm.size(1) else \
Variable(torch.FloatTensor(1, bsize, self.enc_lstm_dim).zero_()).cuda()
# Sort by length (keep idx)
sent_len, idx_sort = np.sort(sent_len)[::-1], np.argsort(-sent_len)
sent = sent.index_select(1, Variable(torch.cuda.LongTensor(idx_sort)))
# Handling padding in Recurrent Networks
sent_packed = nn.utils.rnn.pack_padded_sequence(sent, sent_len)
sent_output = self.enc_lstm(sent_packed, self.init_lstm)[1].squeeze(0)
# batch x 2*nhid
# Un-sort by length
idx_unsort = np.argsort(idx_sort)
emb = sent_output.index_select(0, Variable(torch.cuda.LongTensor(idx_unsort)))
return emb
"""
Inner attention from "hierarchical attention for document classification"
"""
class InnerAttentionNAACLEncoder(nn.Module):
def __init__(self, config):
super(InnerAttentionNAACLEncoder, self).__init__()
self.bsize = config['bsize']
self.word_emb_dim = config['word_emb_dim']
self.enc_lstm_dim = config['enc_lstm_dim']
self.pool_type = config['pool_type']
self.enc_lstm = nn.LSTM(self.word_emb_dim, self.enc_lstm_dim, 1,
bidirectional=True)
self.init_lstm = Variable(torch.FloatTensor(2, self.bsize,
self.enc_lstm_dim).zero_()).cuda()
self.proj_key = nn.Linear(2*self.enc_lstm_dim, 2*self.enc_lstm_dim,
bias=False)
self.proj_lstm = nn.Linear(2*self.enc_lstm_dim, 2*self.enc_lstm_dim,
bias=False)
self.query_embedding = nn.Embedding(1, 2*self.enc_lstm_dim)
self.softmax = nn.Softmax()
def forward(self, sent_tuple):
# sent_len: [max_len, ..., min_len] (batch)
# sent: Variable(seqlen x batch x worddim)
sent, sent_len = sent_tuple
bsize = sent.size(1)
self.init_lstm = self.init_lstm if bsize == self.init_lstm.size(1) else \
Variable(torch.FloatTensor(2, bsize, self.enc_lstm_dim).zero_()).cuda()
# Sort by length (keep idx)
sent_len, idx_sort = np.sort(sent_len)[::-1], np.argsort(-sent_len)
sent = sent.index_select(1, Variable(torch.cuda.LongTensor(idx_sort)))
# Handling padding in Recurrent Networks
sent_packed = nn.utils.rnn.pack_padded_sequence(sent, sent_len)
sent_output = self.enc_lstm(sent_packed,
(self.init_lstm, self.init_lstm))[0]
# seqlen x batch x 2*nhid
sent_output = nn.utils.rnn.pad_packed_sequence(sent_output)[0]
# Un-sort by length
idx_unsort = np.argsort(idx_sort)
sent_output = sent_output.index_select(1, Variable(torch.cuda.LongTensor(idx_unsort)))
sent_output = sent_output.transpose(0,1).contiguous()
sent_output_proj = self.proj_lstm(sent_output.view(-1,
2*self.enc_lstm_dim)).view(bsize, -1, 2*self.enc_lstm_dim)
sent_key_proj = self.proj_key(sent_output.view(-1,
2*self.enc_lstm_dim)).view(bsize, -1, 2*self.enc_lstm_dim)
sent_key_proj = torch.tanh(sent_key_proj)
# NAACL paper: u_it=tanh(W_w.h_it + b_w) (bsize, seqlen, 2nhid)
sent_w = self.query_embedding(Variable(torch.LongTensor(bsize*[0]).cuda())).unsqueeze(2) #(bsize, 2*nhid, 1)
Temp = 2
keys = sent_key_proj.bmm(sent_w).squeeze(2) / Temp
# Set probas of padding to zero in softmax
keys = keys + ((keys == 0).float()*-10000)
alphas = self.softmax(keys/Temp).unsqueeze(2).expand_as(sent_output)
if int(time.time()) % 100 == 0:
print('w', torch.max(sent_w), torch.min(sent_w))
print('alphas', alphas[0, :, 0])
emb = torch.sum(alphas * sent_output_proj, 1).squeeze(1)
return emb
"""
Inner attention inspired from "Self-attentive ..."
"""
class InnerAttentionMILAEncoder(nn.Module):
def __init__(self, config):
super(InnerAttentionMILAEncoder, self).__init__()
self.bsize = config['bsize']
self.word_emb_dim = config['word_emb_dim']
self.enc_lstm_dim = config['enc_lstm_dim']
self.pool_type = config['pool_type']
self.enc_lstm = nn.LSTM(self.word_emb_dim, self.enc_lstm_dim, 1,
bidirectional=True)
self.init_lstm = Variable(torch.FloatTensor(2, self.bsize,
self.enc_lstm_dim).zero_()).cuda()
self.proj_key = nn.Linear(2*self.enc_lstm_dim, 2*self.enc_lstm_dim,
bias=False)
self.proj_lstm = nn.Linear(2*self.enc_lstm_dim, 2*self.enc_lstm_dim,
bias=False)
self.query_embedding = nn.Embedding(2, 2*self.enc_lstm_dim)
self.softmax = nn.Softmax()
def forward(self, sent_tuple):
# sent_len: [max_len, ..., min_len] (batch)
# sent: Variable(seqlen x batch x worddim)
sent, sent_len = sent_tuple
bsize = sent.size(1)
self.init_lstm = self.init_lstm if bsize == self.init_lstm.size(1) else \
Variable(torch.FloatTensor(2, bsize, self.enc_lstm_dim).zero_()).cuda()
# Sort by length (keep idx)
sent_len, idx_sort = np.sort(sent_len)[::-1], np.argsort(-sent_len)
sent = sent.index_select(1, Variable(torch.cuda.LongTensor(idx_sort)))
# Handling padding in Recurrent Networks
sent_packed = nn.utils.rnn.pack_padded_sequence(sent, sent_len)
sent_output = self.enc_lstm(sent_packed,
(self.init_lstm, self.init_lstm))[0]
# seqlen x batch x 2*nhid
sent_output = nn.utils.rnn.pad_packed_sequence(sent_output)[0]
# Un-sort by length
idx_unsort = np.argsort(idx_sort)
sent_output = sent_output.index_select(1,
Variable(torch.cuda.LongTensor(idx_unsort)))
sent_output = sent_output.transpose(0,1).contiguous()
sent_output_proj = self.proj_lstm(sent_output.view(-1,
2*self.enc_lstm_dim)).view(bsize, -1, 2*self.enc_lstm_dim)
sent_key_proj = self.proj_key(sent_output.view(-1,
2*self.enc_lstm_dim)).view(bsize, -1, 2*self.enc_lstm_dim)
sent_key_proj = torch.tanh(sent_key_proj)
# NAACL : u_it=tanh(W_w.h_it + b_w) like in NAACL paper
# Temperature
Temp = 3
sent_w1 = self.query_embedding(Variable(torch.LongTensor(bsize*[0]).cuda())).unsqueeze(2) #(bsize, nhid, 1)
keys1 = sent_key_proj.bmm(sent_w1).squeeze(2) / Temp
keys1 = keys1 + ((keys1 == 0).float()*-1000)
alphas1 = self.softmax(keys1).unsqueeze(2).expand_as(sent_key_proj)
emb1 = torch.sum(alphas1 * sent_output_proj, 1).squeeze(1)
sent_w2 = self.query_embedding(Variable(torch.LongTensor(bsize*[1]).cuda())).unsqueeze(2) #(bsize, nhid, 1)
keys2 = sent_key_proj.bmm(sent_w2).squeeze(2) / Temp
keys2 = keys2 + ((keys2 == 0).float()*-1000)
alphas2 = self.softmax(keys2).unsqueeze(2).expand_as(sent_key_proj)
emb2 = torch.sum(alphas2 * sent_output_proj, 1).squeeze(1)
sent_w3 = self.query_embedding(Variable(torch.LongTensor(bsize*[1]).cuda())).unsqueeze(2) #(bsize, nhid, 1)
keys3 = sent_key_proj.bmm(sent_w3).squeeze(2) / Temp
keys3 = keys3 + ((keys3 == 0).float()*-1000)
alphas3 = self.softmax(keys3).unsqueeze(2).expand_as(sent_key_proj)
emb3 = torch.sum(alphas3 * sent_output_proj, 1).squeeze(1)
sent_w4 = self.query_embedding(Variable(torch.LongTensor(bsize*[1]).cuda())).unsqueeze(2) #(bsize, nhid, 1)
keys4 = sent_key_proj.bmm(sent_w4).squeeze(2) / Temp
keys4 = keys4 + ((keys4 == 0).float()*-1000)
alphas4 = self.softmax(keys4).unsqueeze(2).expand_as(sent_key_proj)
emb4 = torch.sum(alphas4 * sent_output_proj, 1).squeeze(1)
if int(time.time()) % 100 == 0:
print('alphas', torch.cat((alphas1.data[0, :, 0],
alphas2.data[0, :, 0],
torch.abs(alphas1.data[0, :, 0] -
alphas2.data[0, :, 0])), 1))
emb = torch.cat((emb1, emb2, emb3, emb4), 1)
return emb
"""
Inner attention from Yang et al.
"""
class InnerAttentionYANGEncoder(nn.Module):
def __init__(self, config):
super(InnerAttentionYANGEncoder, self).__init__()
self.bsize = config['bsize']
self.word_emb_dim = config['word_emb_dim']
self.enc_lstm_dim = config['enc_lstm_dim']
self.pool_type = config['pool_type']
self.enc_lstm = nn.LSTM(self.word_emb_dim, self.enc_lstm_dim, 1,
bidirectional=True)
self.init_lstm = Variable(torch.FloatTensor(2, self.bsize,
self.enc_lstm_dim).zero_()).cuda()
self.proj_lstm = nn.Linear(2*self.enc_lstm_dim, 2*self.enc_lstm_dim,
bias=True)
self.proj_query = nn.Linear(2*self.enc_lstm_dim, 2*self.enc_lstm_dim,
bias=True)
self.proj_enc = nn.Linear(2*self.enc_lstm_dim, 2*self.enc_lstm_dim,
bias=True)
self.query_embedding = nn.Embedding(1, 2*self.enc_lstm_dim)
self.softmax = nn.Softmax()
def forward(self, sent_tuple):
# sent_len: [max_len, ..., min_len] (batch)
# sent: Variable(seqlen x batch x worddim)
sent, sent_len = sent_tuple
bsize = sent.size(1)
self.init_lstm = self.init_lstm if bsize == self.init_lstm.size(1) else \
Variable(torch.FloatTensor(2, bsize, self.enc_lstm_dim).zero_()).cuda()
# Sort by length (keep idx)
sent_len, idx_sort = np.sort(sent_len)[::-1], np.argsort(-sent_len)
sent = sent.index_select(1, Variable(torch.cuda.LongTensor(idx_sort)))
# Handling padding in Recurrent Networks
sent_packed = nn.utils.rnn.pack_padded_sequence(sent, sent_len)
sent_output = self.enc_lstm(sent_packed,
(self.init_lstm, self.init_lstm))[0]
# seqlen x batch x 2*nhid
sent_output = nn.utils.rnn.pad_packed_sequence(sent_output)[0]
# Un-sort by length
idx_unsort = np.argsort(idx_sort)
sent_output = sent_output.index_select(1,
Variable(torch.cuda.LongTensor(idx_unsort)))
sent_output = sent_output.transpose(0,1).contiguous()
sent_output_proj = self.proj_lstm(sent_output.view(-1,
2*self.enc_lstm_dim)).view(bsize, -1, 2*self.enc_lstm_dim)
sent_keys = self.proj_enc(sent_output.view(-1,
2*self.enc_lstm_dim)).view(bsize, -1, 2*self.enc_lstm_dim)
sent_max = torch.max(sent_output, 1)[0].squeeze(1) # (bsize, 2*nhid)
sent_summary = self.proj_query(
sent_max).unsqueeze(1).expand_as(sent_keys)
# (bsize, seqlen, 2*nhid)
sent_M = torch.tanh(sent_keys + sent_summary)
# (bsize, seqlen, 2*nhid) YANG : M = tanh(Wh_i + Wh_avg
sent_w = self.query_embedding(Variable(torch.LongTensor(
bsize*[0]).cuda())).unsqueeze(2) # (bsize, 2*nhid, 1)
sent_alphas = self.softmax(sent_M.bmm(sent_w).squeeze(2)).unsqueeze(1)
# (bsize, 1, seqlen)
if int(time.time()) % 200 == 0:
print('w', torch.max(sent_w[0]), torch.min(sent_w[0]))
print('alphas', sent_alphas[0][0][0:sent_len[0]])
# Get attention vector
emb = sent_alphas.bmm(sent_output_proj).squeeze(1)
return emb
"""
Hierarchical ConvNet
"""
class ConvNetEncoder(nn.Module):
def __init__(self, config):
super(ConvNetEncoder, self).__init__()
self.bsize = config['bsize']
self.word_emb_dim = config['word_emb_dim']
self.enc_lstm_dim = config['enc_lstm_dim']
self.pool_type = config['pool_type']
self.convnet1 = nn.Sequential(
nn.Conv1d(self.word_emb_dim, 2*self.enc_lstm_dim, kernel_size=3,
stride=1, padding=1),
nn.ReLU(inplace=True),
)
self.convnet2 = nn.Sequential(
nn.Conv1d(2*self.enc_lstm_dim, 2*self.enc_lstm_dim, kernel_size=3,
stride=1, padding=1),
nn.ReLU(inplace=True),
)
self.convnet3 = nn.Sequential(
nn.Conv1d(2*self.enc_lstm_dim, 2*self.enc_lstm_dim, kernel_size=3,
stride=1, padding=1),
nn.ReLU(inplace=True),
)
self.convnet4 = nn.Sequential(
nn.Conv1d(2*self.enc_lstm_dim, 2*self.enc_lstm_dim, kernel_size=3,
stride=1, padding=1),
nn.ReLU(inplace=True),
)
def forward(self, sent_tuple):
# sent_len: [max_len, ..., min_len] (batch)
# sent: Variable(seqlen x batch x worddim)
sent, sent_len = sent_tuple
sent = sent.transpose(0,1).transpose(1,2).contiguous()
# batch, nhid, seqlen)
sent = self.convnet1(sent)
u1 = torch.max(sent, 2)[0]
sent = self.convnet2(sent)
u2 = torch.max(sent, 2)[0]
sent = self.convnet3(sent)
u3 = torch.max(sent, 2)[0]
sent = self.convnet4(sent)
u4 = torch.max(sent, 2)[0]
emb = torch.cat((u1, u2, u3, u4), 1)
return emb
"""
Main module for Natural Language Inference
"""
class NLINet(nn.Module):
def __init__(self, config):
super(NLINet, self).__init__()
# classifier
self.nonlinear_fc = config['nonlinear_fc']
self.fc_dim = config['fc_dim']
self.n_classes = config['n_classes']
self.enc_lstm_dim = config['enc_lstm_dim']
self.encoder_type = config['encoder_type']
self.dpout_fc = config['dpout_fc']
self.encoder = eval(self.encoder_type)(config)
self.inputdim = 4*2*self.enc_lstm_dim
self.inputdim = 4*self.inputdim if self.encoder_type in \
["ConvNetEncoder", "InnerAttentionMILAEncoder"] else self.inputdim
self.inputdim = self.inputdim/2 if self.encoder_type == "LSTMEncoder" \
else self.inputdim
if self.nonlinear_fc:
self.classifier = nn.Sequential(
nn.Dropout(p=self.dpout_fc),
nn.Linear(self.inputdim, self.fc_dim),
nn.Tanh(),
nn.Dropout(p=self.dpout_fc),
nn.Linear(self.fc_dim, self.fc_dim),
nn.Tanh(),
nn.Dropout(p=self.dpout_fc),
nn.Linear(self.fc_dim, self.n_classes),
)
else:
self.classifier = nn.Sequential(
nn.Linear(self.inputdim, self.fc_dim),
nn.Linear(self.fc_dim, self.fc_dim),
nn.Linear(self.fc_dim, self.n_classes)
)
def forward(self, s1, s2):
# s1 : (s1, s1_len)
u = self.encoder(s1)
v = self.encoder(s2)
features = torch.cat((u, v, torch.abs(u-v), u*v), 1)
output = self.classifier(features)
return output
def encode(self, s1):
emb = self.encoder(s1)
return emb
"""
Main module for Classification
"""
class ClassificationNet(nn.Module):
def __init__(self, config):
super(ClassificationNet, self).__init__()
# classifier
self.nonlinear_fc = config['nonlinear_fc']
self.fc_dim = config['fc_dim']
self.n_classes = config['n_classes']
self.enc_lstm_dim = config['enc_lstm_dim']
self.encoder_type = config['encoder_type']
self.dpout_fc = config['dpout_fc']
self.encoder = eval(self.encoder_type)(config)
self.inputdim = 2*self.enc_lstm_dim
self.inputdim = 4*self.inputdim if self.encoder_type == "ConvNetEncoder" else self.inputdim
self.inputdim = self.enc_lstm_dim if self.encoder_type =="LSTMEncoder" else self.inputdim
self.classifier = nn.Sequential(
nn.Linear(self.inputdim, 512),
nn.Linear(512, self.n_classes),
)
def forward(self, s1):
# s1 : (s1, s1_len)
u = self.encoder(s1)
output = self.classifier(u)
return output
def encode(self, s1):
emb = self.encoder(s1)
return emb