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slr_network_multi.py
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slr_network_multi.py
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import pdb
import copy
import utils
import torch
import types
import numpy as np
import torch.nn as nn
import torch.nn.functional as F
import torchvision.models as models
from modules.criterions import SeqKD
from modules import BiLSTMLayer, TemporalSlowFastFuse
import slowfast_modules.slowfast as slowfast
import importlib
class Identity(nn.Module):
def __init__(self):
super(Identity, self).__init__()
def forward(self, x):
return x
class NormLinear(nn.Module):
def __init__(self, in_dim, out_dim):
super(NormLinear, self).__init__()
self.weight = nn.Parameter(torch.Tensor(in_dim, out_dim))
nn.init.xavier_uniform_(self.weight, gain=nn.init.calculate_gain('relu'))
def forward(self, x):
outputs = torch.matmul(x, F.normalize(self.weight, dim=0))
return outputs
class SLRModel(nn.Module):
def __init__(
self, num_classes, c2d_type, conv_type, load_pkl, slowfast_config, slowfast_args=None,
use_bn=False, hidden_size=1024, gloss_dict=None, loss_weights=None,
weight_norm=True, share_classifier=1
):
super(SLRModel, self).__init__()
self.decoder = None
self.loss = dict()
self.criterion_init()
self.num_classes = num_classes
self.loss_weights = loss_weights
self.conv2d = getattr(slowfast, c2d_type)(slowfast_config=slowfast_config, slowfast_args=slowfast_args,
load_pkl=load_pkl, multi=True)
self.conv1d = TemporalSlowFastFuse(fast_input_size=256, slow_input_size=2048, hidden_size=hidden_size, conv_type=conv_type, use_bn=use_bn, num_classes=num_classes)
self.decoder = utils.Decode(gloss_dict, num_classes, 'beam')
self.temporal_model = nn.ModuleList([BiLSTMLayer(rnn_type='LSTM', input_size=hidden_size, hidden_size=hidden_size,
num_layers=2, bidirectional=True) for i in range(3)])
if weight_norm:
self.classifier = nn.ModuleList([NormLinear(hidden_size, self.num_classes) for i in range(3)])
self.conv1d.fc = nn.ModuleList([NormLinear(hidden_size, self.num_classes) for i in range(3)])
else:
self.classifier = nn.ModuleList([nn.Linear(hidden_size, self.num_classes) for i in range(3)])
self.conv1d.fc = nn.ModuleList([nn.Linear(hidden_size, self.num_classes) for i in range(3)])
if share_classifier == 1:
self.conv1d.fc = self.classifier
elif share_classifier == 2:
classifier = self.classifier[0]
self.classifier = nn.ModuleList([classifier for i in range(3)])
self.conv1d.fc = nn.ModuleList([classifier for i in range(3)])
#self.register_backward_hook(self.backward_hook)
def backward_hook(self, module, grad_input, grad_output):
for g in grad_input:
g[g != g] = 0
def masked_bn(self, inputs, len_x):
def pad(tensor, length):
return torch.cat([tensor, tensor.new(length - tensor.size(0), *tensor.size()[1:]).zero_()])
x = torch.cat([inputs[len_x[0] * idx:len_x[0] * idx + lgt] for idx, lgt in enumerate(len_x)])
x = self.conv2d(x)
x = torch.cat([pad(x[sum(len_x[:idx]):sum(len_x[:idx + 1])], len_x[0])
for idx, lgt in enumerate(len_x)])
return x
def forward(self, x, len_x, label=None, label_lgt=None):
if len(x.shape) == 5:
framewise = self.conv2d(x.permute(0,2,1,3,4))
else:
# frame-wise features
framewise = x
conv1d_outputs = self.conv1d(framewise, len_x)
lgt = conv1d_outputs['feat_len']
outputs = []
for i in range(len(conv1d_outputs['visual_feat'])):
tm_outputs = self.temporal_model[i](conv1d_outputs['visual_feat'][i], lgt)
outputs.append(self.classifier[i](tm_outputs['predictions']))
pred = None if self.training \
else self.decoder.decode(outputs[0], lgt, batch_first=False, probs=False)
conv_pred = None if self.training \
else self.decoder.decode(conv1d_outputs['conv_logits'][0], lgt, batch_first=False, probs=False)
return {
#"framewise_features": framewise,
#"visual_features": conv1d_outputs['visual_feat'],
"feat_len": lgt,
"conv_logits": conv1d_outputs["conv_logits"],
"sequence_logits": outputs,
"conv_sents": conv_pred,
"recognized_sents": pred,
}
def criterion_calculation(self, ret_dict, label, label_lgt):
loss = 0
for k, weight in self.loss_weights.items():
if k == 'SeqCTC':
loss += weight * self.loss['CTCLoss'](ret_dict["sequence_logits"][0].log_softmax(-1),
label.cpu().int(), ret_dict["feat_len"].cpu().int(),
label_lgt.cpu().int()).mean()
elif k == 'Slow' or k == 'Fast':
i = 1 if k == 'Slow' else 2
loss += weight * self.loss_weights['SeqCTC'] * self.loss['CTCLoss'](ret_dict["sequence_logits"][i].log_softmax(-1),
label.cpu().int(), ret_dict["feat_len"].cpu().int(),
label_lgt.cpu().int()).mean()
if 'ConvCTC' in self.loss_weights:
loss += weight * self.loss_weights['ConvCTC'] * self.loss['CTCLoss'](ret_dict["conv_logits"][i].log_softmax(-1),
label.cpu().int(), ret_dict["feat_len"].cpu().int(),
label_lgt.cpu().int()).mean()
if 'Dist' in self.loss_weights:
# loss += weight * self.loss_weights['Dist'] * self.loss['distillation'](ret_dict["conv_intra_logits"][i],
# ret_dict["sequence_logits"].detach(),
# use_blank=False)
loss += weight * self.loss_weights['Dist'] * self.loss['distillation'](ret_dict["conv_logits"][i],
ret_dict["sequence_logits"][i].detach(),
use_blank=False)
elif k == 'ConvCTC':
loss += weight * self.loss['CTCLoss'](ret_dict["conv_logits"][0].log_softmax(-1),
label.cpu().int(), ret_dict["feat_len"].cpu().int(),
label_lgt.cpu().int()).mean()
elif k == 'Dist':
loss += weight * self.loss['distillation'](ret_dict["conv_logits"][0],
ret_dict["sequence_logits"][0].detach(),
use_blank=False)
return loss
def criterion_init(self):
self.loss['CTCLoss'] = torch.nn.CTCLoss(reduction='none', zero_infinity=False)
self.loss['distillation'] = SeqKD(T=8)
return self.loss