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auxi_net_v0.py
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auxi_net_v0.py
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import torch
import torch.nn as nn
import math
import torch.utils.model_zoo as model_zoo
import copy
__all__ = ['ResNet', 'resnet18_carla', 'resnet34_carla', 'resnet50_carla']
model_urls = {
'resnet18': 'https://download.pytorch.org/models/resnet18-5c106cde.pth',
'resnet34': 'https://download.pytorch.org/models/resnet34-333f7ec4.pth',
'resnet50': 'https://download.pytorch.org/models/resnet50-19c8e357.pth',
'resnet101': 'https://download.pytorch.org/models/resnet101-5d3b4d8f.pth',
'resnet152': 'https://download.pytorch.org/models/resnet152-b121ed2d.pth',
}
model_paths = {
'resnet34': 'resnet34-333f7ec4.pth',
}
'''
in_planes: input channels
out_planes: output channels
'''
def conv3x3(in_planes, out_planes, stride=1):
"3x3 convolution with padding"
return nn.Conv2d(in_planes, out_planes, kernel_size=3, stride=stride,
padding=1, bias=False)
class ChannelAttention(nn.Module):
def __init__(self, in_planes, ratio=16):
super(ChannelAttention, self).__init__()
# AdaptiveAvgPooling2d는 Batch, Channel은 유지.
# 원하는 output W, H를 입력하면 kernal_size, stride등을 자동으로 설정하여 연산.
self.avg_pool = nn.AdaptiveAvgPool2d(1)
self.max_pool = nn.AdaptiveMaxPool2d(1)
self.fc1 = nn.Conv2d(in_planes, in_planes // 16, 1, bias=False)
self.relu1 = nn.ReLU()
self.fc2 = nn.Conv2d(in_planes // 16, in_planes, 1, bias=False)
self.sigmoid = nn.Sigmoid()
def forward(self, x):
avg_out = self.fc2(self.relu1(self.fc1(self.avg_pool(x))))
max_out = self.fc2(self.relu1(self.fc1(self.max_pool(x))))
out = avg_out + max_out
return self.sigmoid(out)
class SpatialAttention(nn.Module):
def __init__(self, kernel_size=7):
super(SpatialAttention, self).__init__()
assert kernel_size in (3, 7), 'kernel size must be 3 or 7'
padding = 3 if kernel_size == 7 else 1
self.conv1 = nn.Conv2d(2, 1, kernel_size, padding=padding, bias=False)
self.sigmoid = nn.Sigmoid()
def forward(self, x):
avg_out = torch.mean(x, dim=1, keepdim=True)
max_out, _ = torch.max(x, dim=1, keepdim=True)
x = torch.cat([avg_out, max_out], dim=1)
x = self.conv1(x)
return self.sigmoid(x)
class BasicBlock(nn.Module):
expansion = 1
def __init__(self, inplanes, planes, stride=1, downsample=None):
super(BasicBlock, self).__init__()
self.conv1 = conv3x3(inplanes, planes, stride)
self.bn1 = nn.BatchNorm2d(planes)
self.relu = nn.ReLU(inplace=True)
self.conv2 = conv3x3(planes, planes)
self.bn2 = nn.BatchNorm2d(planes)
self.ca = ChannelAttention(planes)
self.sa = SpatialAttention()
self.downsample = downsample
self.stride = stride
def forward(self, x):
residual = x
out = self.conv1(x)
out = self.bn1(out)
out = self.relu(out)
out = self.conv2(out)
out = self.bn2(out)
out = self.ca(out) * out
out = self.sa(out) * out
if self.downsample is not None:
residual = self.downsample(x)
out += residual
out = self.relu(out)
return out
class Bottleneck(nn.Module):
expansion = 4
def __init__(self, inplanes, planes, stride=1, downsample=None):
super(Bottleneck, self).__init__()
self.conv1 = nn.Conv2d(inplanes, planes, kernel_size=1, bias=False)
self.bn1 = nn.BatchNorm2d(planes)
self.conv2 = nn.Conv2d(planes, planes, kernel_size=3, stride=stride,
padding=1, bias=False)
self.bn2 = nn.BatchNorm2d(planes)
self.conv3 = nn.Conv2d(planes, planes * 4, kernel_size=1, bias=False)
self.bn3 = nn.BatchNorm2d(planes * 4)
self.relu = nn.ReLU(inplace=True)
self.ca = ChannelAttention(planes * 4)
self.sa = SpatialAttention()
self.downsample = downsample
self.stride = stride
def forward(self, x):
residual = x
out = self.conv1(x)
out = self.bn1(out)
out = self.relu(out)
out = self.conv2(out)
out = self.bn2(out)
out = self.relu(out)
out = self.conv3(out)
out = self.bn3(out)
out = self.ca(out) * out
out = self.sa(out) * out
if self.downsample is not None:
residual = self.downsample(x)
out += residual
out = self.relu(out)
return out
class ResNet(nn.Module):
def __init__(self, block, layers, num_classes=1000):
self.inplanes = 64
self.inplanes_2 = self.inplanes
super(ResNet, self).__init__()
self.conv1 = nn.Conv2d(3, 64, kernel_size=7, stride=2, padding=3,
bias=False)
self.bn1 = nn.BatchNorm2d(64)
self.relu = nn.ReLU(inplace=True)
self.maxpool = nn.MaxPool2d(kernel_size=3, stride=2, padding=1)
self.layer1 = self._make_layer(block, 64, layers[0])
self.layer2 = self._make_layer(block, 128, layers[1], stride=2)
self.layer3 = self._make_layer(block, 256, layers[2], stride=2)
self.layer4 = self._make_layer(block, 512, layers[3], stride=2)
# self.avgpool = nn.AvgPool2d(7, stride=1)
self.fc = nn.Linear(512 * block.expansion, num_classes)
# fc layers
self.img_fc = nn.Sequential(
nn.Linear(10752, 512),
nn.Dropout(0.3),
nn.ReLU(),
nn.Linear(512, 512),
nn.Dropout(0.3),
nn.ReLU(),
)
self.speed_fc = nn.Sequential(
nn.Linear(1, 128),
nn.Dropout(0.5),
nn.ReLU(),
nn.Linear(128, 128),
nn.Dropout(0.5),
nn.ReLU(),
)
self.emb_fc = nn.Sequential(
nn.Linear(512 + 128, 512),
nn.Dropout(0.5),
nn.ReLU(),
)
self.branches = nn.ModuleList([
nn.Sequential(
nn.Linear(512, 256),
nn.Dropout(0.5),
nn.ReLU(),
nn.Linear(256, 256),
# nn.Dropout(self.dropout_vec[i*2+14]),
nn.ReLU(),
nn.Linear(256, 1),
) for i in range(4)
])
self.speed_branch = nn.Sequential(
nn.Linear(512, 256),
nn.Dropout(0.5),
nn.ReLU(),
nn.Linear(256, 256),
# nn.Dropout(self.dropout_vec[1]),
nn.ReLU(),
nn.Linear(256, 1),
)
for m in self.modules():
if isinstance(m, nn.Conv2d):
n = m.kernel_size[0] * m.kernel_size[1] * m.out_channels
m.weight.data.normal_(0, math.sqrt(2. / n))
elif isinstance(m, nn.BatchNorm2d):
m.weight.data.fill_(1)
m.bias.data.zero_()
elif isinstance(m, nn.Linear):
nn.init.xavier_uniform_(
m.weight)
m.bias.data.fill_(0.01)
def _make_layer(self, block, planes, blocks, stride=1):
downsample = None
if stride != 1 or self.inplanes != planes * block.expansion:
downsample = nn.Sequential(
nn.Conv2d(self.inplanes, planes * block.expansion,
kernel_size=1, stride=stride, bias=False),
nn.BatchNorm2d(planes * block.expansion),
)
layers = []
layers.append(block(self.inplanes, planes, stride, downsample))
self.inplanes_2 = self.inplanes # 동일한 형태의 layer branch를 만들기 위해 변경 전의 self.inplanes를 저장
self.inplanes = planes * block.expansion
for i in range(1, blocks):
layers.append(block(self.inplanes, planes))
return nn.Sequential(*layers)
def _make_layer_2(self, block, planes, blocks, stride=1):
downsample = None
if stride != 1 or self.inplanes_2 != planes * block.expansion:
downsample = nn.Sequential(
nn.Conv2d(self.inplanes_2, planes * block.expansion,
kernel_size=1, stride=stride, bias=False),
nn.BatchNorm2d(planes * block.expansion),
)
layers = []
layers.append(block(self.inplanes_2, planes, stride, downsample))
self.inplanes_2 = planes * block.expansion
for i in range(1, blocks):
layers.append(block(self.inplanes_2, planes))
return nn.Sequential(*layers)
def forward(self, x, speed):
x = self.conv1(x)
x = self.bn1(x)
x = self.relu(x)
x = self.maxpool(x)
x = self.layer1(x)
x = self.layer2(x)
x = self.layer3(x)
x = self.layer4(x)
x = x.view(x.size(0), -1)
x = self.img_fc(x)
speed = self.speed_fc(speed)
emb = torch.cat([x, speed], dim=1)
emb = self.emb_fc(emb)
output = torch.cat([out(emb) for out in self.branches],
dim=1)
pred_speed = self.speed_branch(x)
return output, pred_speed
def resnet18_carla(pretrained=False, **kwargs):
"""Constructs a ResNet-18 model.
Args:
pretrained (bool): If True, returns a model pre-trained on ImageNet
"""
model = ResNet(BasicBlock, [2, 2, 2, 2], **kwargs)
if pretrained:
pretrained_state_dict = model_zoo.load_url(model_urls['resnet18'])
now_state_dict = model.state_dict()
now_state_dict.update(pretrained_state_dict)
model.load_state_dict(now_state_dict)
return model
def resnet34_carla(pretrained=False, **kwargs):
"""Constructs a ResNet-34 model.
Args:
pretrained (bool): If True, returns a model pre-trained on ImageNet
"""
model = ResNet(BasicBlock, [3, 4, 6, 3], **kwargs)
if pretrained:
now_state_dict = model.state_dict()
# pretrained_state_dict = model_zoo.load_url(model_urls['resnet34'])
pretrained_state_dict = torch.load(model_paths['resnet34'])
# model_paths
# 1. filter out unnecessary keys
pretrained_state_dict = {k: v for k, v in pretrained_state_dict.items() if k in now_state_dict}
# 2. overwrite entries in the existing state dict
now_state_dict.update(pretrained_state_dict)
# 3. load the new state dict
model.load_state_dict(now_state_dict)
return model
def resnet50_carla(pretrained=False, **kwargs):
"""Constructs a ResNet-50 model.
Args:
pretrained (bool): If True, returns a model pre-trained on ImageNet
"""
model = ResNet(BasicBlock, [3, 4, 6, 3], **kwargs)
if pretrained:
now_state_dict = model.state_dict()
# pretrained_state_dict = model_zoo.load_url(model_urls['resnet34'])
pretrained_state_dict = torch.load(model_paths['resnet34'])
# model_paths
# 1. filter out unnecessary keys
pretrained_state_dict = {k: v for k, v in pretrained_state_dict.items() if k in now_state_dict}
# 2. overwrite entries in the existing state dict
now_state_dict.update(pretrained_state_dict)
# 3. load the new state dict
model.load_state_dict(now_state_dict)
return model