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import torch.nn as nn
import torch.nn.parallel
from torch.autograd import Variable
from torchvision import models
import torch.utils.model_zoo as model_zoo
import torch.nn.functional as F
from torch.nn.utils.rnn import pack_padded_sequence, pad_packed_sequence
from transformers import AutoModel
from miscc.config import cfg
def conv1x1(in_planes, out_planes, bias=False):
"1x1 convolution with padding"
return nn.Conv2d(in_planes, out_planes, kernel_size=1, stride=1, padding=0, bias=bias)
def conv3x3(in_planes, out_planes, bias=False):
"3x3 convolution with padding"
return nn.Conv2d(in_planes, out_planes, kernel_size=3, stride=1, padding=1, bias=bias)
# ############## Text2Image Encoder-Decoder #######
class RNN_ENCODER(nn.Module):
def __init__(self, ntoken, ninput=300, drop_prob=0.5,
nhidden=128, nlayers=1, bidirectional=True):
super(RNN_ENCODER, self).__init__()
self.n_steps = cfg.TEXT.WORDS_NUM
self.ntoken = ntoken # size of the dictionary
self.ninput = ninput # size of each embedding vector
self.drop_prob = drop_prob # probability of an element to be zeroed
self.nlayers = nlayers # Number of recurrent layers
self.bidirectional = bidirectional
self.rnn_type = cfg.RNN_TYPE
if bidirectional:
self.num_directions = 2
else:
self.num_directions = 1
# number of features in the hidden state
self.nhidden = nhidden // self.num_directions
self.define_module()
self.init_weights()
def define_module(self):
self.encoder = nn.Embedding(self.ntoken, self.ninput)
self.drop = nn.Dropout(self.drop_prob)
if self.rnn_type == 'LSTM':
# dropout: If non-zero, introduces a dropout layer on
# the outputs of each RNN layer except the last layer
self.rnn = nn.LSTM(self.ninput, self.nhidden,
self.nlayers, batch_first=True,
dropout=self.drop_prob,
bidirectional=self.bidirectional)
elif self.rnn_type == 'GRU':
self.rnn = nn.GRU(self.ninput, self.nhidden,
self.nlayers, batch_first=True,
dropout=self.drop_prob,
bidirectional=self.bidirectional)
else:
raise NotImplementedError
def init_weights(self):
initrange = 0.1
self.encoder.weight.data.uniform_(-initrange, initrange)
# Do not need to initialize RNN parameters, which have been initialized
# http://pytorch.org/docs/master/_modules/torch/nn/modules/rnn.html#LSTM
# self.decoder.weight.data.uniform_(-initrange, initrange)
# self.decoder.bias.data.fill_(0)
def init_hidden(self, bsz):
weight = next(self.parameters()).data
if self.rnn_type == 'LSTM':
return (Variable(weight.new(self.nlayers * self.num_directions,
bsz, self.nhidden).zero_()),
Variable(weight.new(self.nlayers * self.num_directions,
bsz, self.nhidden).zero_()))
else:
return Variable(weight.new(self.nlayers * self.num_directions,
bsz, self.nhidden).zero_())
def forward(self, captions, cap_lens, hidden, mask=None):
# input: torch.LongTensor of size batch x n_steps
# --> emb: batch x n_steps x ninput
emb = self.drop(self.encoder(captions))
#
# Returns: a PackedSequence object
cap_lens = cap_lens.data.tolist()
emb = pack_padded_sequence(emb, cap_lens, batch_first=True)
# #hidden and memory (num_layers * num_directions, batch, hidden_size):
# tensor containing the initial hidden state for each element in batch.
# #output (batch, seq_len, hidden_size * num_directions)
# #or a PackedSequence object:
# tensor containing output features (h_t) from the last layer of RNN
output, hidden = self.rnn(emb, hidden)
# PackedSequence object
# --> (batch, seq_len, hidden_size * num_directions)
output = pad_packed_sequence(output, batch_first=True)[0]
# output = self.drop(output)
# --> batch x hidden_size*num_directions x seq_len
words_emb = output.transpose(1, 2)
# --> batch x num_directions*hidden_size
if self.rnn_type == 'LSTM':
sent_emb = hidden[0].transpose(0, 1).contiguous()
else:
sent_emb = hidden.transpose(0, 1).contiguous()
sent_emb = sent_emb.view(-1, self.nhidden * self.num_directions)
return words_emb, sent_emb
class CNN_ENCODER(nn.Module):
def __init__(self, nef):
super(CNN_ENCODER, self).__init__()
if cfg.TRAIN.FLAG:
self.nef = nef
else:
self.nef = 256 # define a uniform ranker
model = models.inception_v3()
url = 'https://download.pytorch.org/models/inception_v3_google-1a9a5a14.pth'
model.load_state_dict(model_zoo.load_url(url))
for param in model.parameters():
param.requires_grad = False
print('Load pretrained model from ', url)
# print(model)
self.define_module(model)
self.init_trainable_weights()
def define_module(self, model):
self.Conv2d_1a_3x3 = model.Conv2d_1a_3x3
self.Conv2d_2a_3x3 = model.Conv2d_2a_3x3
self.Conv2d_2b_3x3 = model.Conv2d_2b_3x3
self.Conv2d_3b_1x1 = model.Conv2d_3b_1x1
self.Conv2d_4a_3x3 = model.Conv2d_4a_3x3
self.Mixed_5b = model.Mixed_5b
self.Mixed_5c = model.Mixed_5c
self.Mixed_5d = model.Mixed_5d
self.Mixed_6a = model.Mixed_6a
self.Mixed_6b = model.Mixed_6b
self.Mixed_6c = model.Mixed_6c
self.Mixed_6d = model.Mixed_6d
self.Mixed_6e = model.Mixed_6e
self.Mixed_7a = model.Mixed_7a
self.Mixed_7b = model.Mixed_7b
self.Mixed_7c = model.Mixed_7c
self.emb_features = conv1x1(768, self.nef)
self.emb_cnn_code = nn.Linear(2048, self.nef)
def init_trainable_weights(self):
initrange = 0.1
self.emb_features.weight.data.uniform_(-initrange, initrange)
self.emb_cnn_code.weight.data.uniform_(-initrange, initrange)
def forward(self, x):
features = None
# --> fixed-size input: batch x 3 x 299 x 299
x = nn.functional.interpolate(x,size=(299, 299), mode='bilinear', align_corners=False)
# 299 x 299 x 3
x = self.Conv2d_1a_3x3(x)
# 149 x 149 x 32
x = self.Conv2d_2a_3x3(x)
# 147 x 147 x 32
x = self.Conv2d_2b_3x3(x)
# 147 x 147 x 64
x = F.max_pool2d(x, kernel_size=3, stride=2)
# 73 x 73 x 64
x = self.Conv2d_3b_1x1(x)
# 73 x 73 x 80
x = self.Conv2d_4a_3x3(x)
# 71 x 71 x 192
x = F.max_pool2d(x, kernel_size=3, stride=2)
# 35 x 35 x 192
x = self.Mixed_5b(x)
# 35 x 35 x 256
x = self.Mixed_5c(x)
# 35 x 35 x 288
x = self.Mixed_5d(x)
# 35 x 35 x 288
x = self.Mixed_6a(x)
# 17 x 17 x 768
x = self.Mixed_6b(x)
# 17 x 17 x 768
x = self.Mixed_6c(x)
# 17 x 17 x 768
x = self.Mixed_6d(x)
# 17 x 17 x 768
x = self.Mixed_6e(x)
# 17 x 17 x 768
# image region features
features = x
# 17 x 17 x 768
x = self.Mixed_7a(x)
# 8 x 8 x 1280
x = self.Mixed_7b(x)
# 8 x 8 x 2048
x = self.Mixed_7c(x)
# 8 x 8 x 2048
x = F.avg_pool2d(x, kernel_size=8)
# 1 x 1 x 2048
# x = F.dropout(x, training=self.training)
# 1 x 1 x 2048
x = x.view(x.size(0), -1)
# 2048
# global image features
cnn_code = self.emb_cnn_code(x)
# 512
if features is not None:
features = self.emb_features(features)
return features, cnn_code
class BERT_RNN_ENCODER(RNN_ENCODER):
def define_module(self):
self.encoder = AutoModel.from_pretrained(cfg.GAN.BERT_NAME)
for param in self.encoder.parameters():
param.requires_grad = False
self.bert_linear = nn.Linear(768, self.ninput)
self.drop = nn.Dropout(self.drop_prob)
if self.rnn_type == 'LSTM':
# dropout: If non-zero, introduces a dropout layer on
# the outputs of each RNN layer except the last layer
self.rnn = nn.LSTM(self.ninput, self.nhidden,
self.nlayers, batch_first=True,
dropout=self.drop_prob,
bidirectional=self.bidirectional)
elif self.rnn_type == 'GRU':
self.rnn = nn.GRU(self.ninput, self.nhidden,
self.nlayers, batch_first=True,
dropout=self.drop_prob,
bidirectional=self.bidirectional)
else:
raise NotImplementedError
def init_weights(self):
initrange = 0.1
self.bert_linear.weight.data.uniform_(-initrange, initrange)
# Do not need to initialize RNN parameters, which have been initialized
# http://pytorch.org/docs/master/_modules/torch/nn/modules/rnn.html#LSTM
# self.decoder.weight.data.uniform_(-initrange, initrange)
# self.decoder.bias.data.fill_(0)
def forward(self, captions, cap_lens, hidden, mask=None):
# input: torch.LongTensor of size batch x n_steps
# --> emb: batch x n_steps x ninput
emb, _ = self.encoder(captions, output_hidden_states= False, return_dict= False)
emb = self.bert_linear(emb)
emb = self.drop(emb)
#
# Returns: a PackedSequence object
cap_lens = cap_lens.data.tolist()
emb = pack_padded_sequence(emb, cap_lens, batch_first=True)
# #hidden and memory (num_layers * num_directions, batch, hidden_size):
# tensor containing the initial hidden state for each element in batch.
# #output (batch, seq_len, hidden_size * num_directions)
# #or a PackedSequence object:
# tensor containing output features (h_t) from the last layer of RNN
output, hidden = self.rnn(emb, hidden)
# PackedSequence object
# --> (batch, seq_len, hidden_size * num_directions)
output = pad_packed_sequence(output, batch_first=True)[0]
# output = self.drop(output)
# --> batch x hidden_size*num_directions x seq_len
words_emb = output.transpose(1, 2)
# --> batch x num_directions*hidden_size
if self.rnn_type == 'LSTM':
sent_emb = hidden[0].transpose(0, 1).contiguous()
else:
sent_emb = hidden.transpose(0, 1).contiguous()
sent_emb = sent_emb.view(-1, self.nhidden * self.num_directions)
return words_emb, sent_emb
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