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#
# This work is licensed under the Creative Commons
# Attribution-NonCommercial-ShareAlike 4.0 International License.
# To view a copy of this license, visit
# http://creativecommons.org/licenses/by-nc-sa/4.0/ or send a letter to
# Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.
# This file was taken as is from the https://github.com/chenxi116/DeepLabv3.pytorch repository.
import torch
import torch.nn as nn
import math
import torch.utils.model_zoo as model_zoo
from torch.nn import functional as F
__all__ = ['ResNet', 'resnet50', 'resnet101', 'resnet152']
NN_UPSAMPLE_ALIGN_CORNERS = False
model_urls = {
'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',
}
class Conv2d(nn.Conv2d):
def __init__(self, in_channels, out_channels, kernel_size, stride=1,
padding=0, dilation=1, groups=1, bias=True):
super(Conv2d, self).__init__(in_channels, out_channels, kernel_size, stride,
padding, dilation, groups, bias)
def forward(self, x):
# return super(Conv2d, self).forward(x)
weight = self.weight
weight_mean = weight.mean(dim=1, keepdim=True).mean(dim=2,
keepdim=True).mean(dim=3, keepdim=True)
weight = weight - weight_mean
std = weight.view(weight.size(0), -1).std(dim=1).view(-1, 1, 1, 1) + 1e-5
weight = weight / std.expand_as(weight)
return F.conv2d(x, weight, self.bias, self.stride,
self.padding, self.dilation, self.groups)
class ASPP(nn.Module):
def __init__(self, C, depth, num_classes, conv=nn.Conv2d, norm=nn.BatchNorm2d, momentum=0.0003, mult=1):
super(ASPP, self).__init__()
self._C = C
self._depth = depth
self._num_classes = num_classes
self.global_pooling = nn.AdaptiveAvgPool2d(1)
self.relu = nn.ReLU(inplace=True)
self.aspp1 = conv(C, depth, kernel_size=1, stride=1, bias=False)
self.aspp2 = conv(C, depth, kernel_size=3, stride=1,
dilation=int(6*mult), padding=int(6*mult),
bias=False)
self.aspp3 = conv(C, depth, kernel_size=3, stride=1,
dilation=int(12*mult), padding=int(12*mult),
bias=False)
self.aspp4 = conv(C, depth, kernel_size=3, stride=1,
dilation=int(18*mult), padding=int(18*mult),
bias=False)
self.aspp5 = conv(C, depth, kernel_size=1, stride=1, bias=False)
self.aspp1_bn = norm(depth, momentum)
self.aspp2_bn = norm(depth, momentum)
self.aspp3_bn = norm(depth, momentum)
self.aspp4_bn = norm(depth, momentum)
self.aspp5_bn = norm(depth, momentum)
self.conv2 = conv(depth * 5, depth, kernel_size=1, stride=1,
bias=False)
self.bn2 = norm(depth, momentum)
self.conv3 = nn.Conv2d(depth, num_classes, kernel_size=1, stride=1)
def forward(self, x):
x1 = self.aspp1(x)
x1 = self.aspp1_bn(x1)
x1 = self.relu(x1)
x2 = self.aspp2(x)
x2 = self.aspp2_bn(x2)
x2 = self.relu(x2)
x3 = self.aspp3(x)
x3 = self.aspp3_bn(x3)
x3 = self.relu(x3)
x4 = self.aspp4(x)
x4 = self.aspp4_bn(x4)
x4 = self.relu(x4)
x5 = self.global_pooling(x)
x5 = self.aspp5(x5)
x5 = self.aspp5_bn(x5)
x5 = self.relu(x5)
x5 = nn.Upsample((x.shape[2], x.shape[3]), mode='bilinear',
align_corners=NN_UPSAMPLE_ALIGN_CORNERS)(x5)
x = torch.cat((x1, x2, x3, x4, x5), 1)
x = self.conv2(x)
x = self.bn2(x)
x = self.relu(x)
x = self.conv3(x)
return x
class Bottleneck(nn.Module):
expansion = 4
def __init__(self, inplanes, planes, stride=1, downsample=None, dilation=1, conv=None, norm=None):
super(Bottleneck, self).__init__()
self.conv1 = conv(inplanes, planes, kernel_size=1, bias=False)
self.bn1 = norm(planes)
self.conv2 = conv(planes, planes, kernel_size=3, stride=stride,
dilation=dilation, padding=dilation, bias=False)
self.bn2 = norm(planes)
self.conv3 = conv(planes, planes * self.expansion, kernel_size=1, bias=False)
self.bn3 = norm(planes * self.expansion)
self.relu = nn.ReLU(inplace=True)
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)
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, num_groups=None, weight_std=False, beta=False):
self.inplanes = 64
self.norm = lambda planes, momentum=0.05: nn.BatchNorm2d(planes, momentum=momentum) if num_groups is None else nn.GroupNorm(num_groups, planes)
self.conv = Conv2d if weight_std else nn.Conv2d
super(ResNet, self).__init__()
if not beta:
self.conv1 = self.conv(3, 64, kernel_size=7, stride=2, padding=3,
bias=False)
else:
self.conv1 = nn.Sequential(
self.conv(3, 64, 3, stride=2, padding=1, bias=False),
self.conv(64, 64, 3, stride=1, padding=1, bias=False),
self.conv(64, 64, 3, stride=1, padding=1, bias=False))
self.bn1 = self.norm(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=1,
dilation=2)
self.aspp = ASPP(512 * block.expansion, 256, num_classes, conv=self.conv, norm=self.norm)
for m in self.modules():
if isinstance(m, self.conv):
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) or isinstance(m, nn.GroupNorm):
m.weight.data.fill_(1)
m.bias.data.zero_()
def _make_layer(self, block, planes, blocks, stride=1, dilation=1):
downsample = None
if stride != 1 or dilation != 1 or self.inplanes != planes * block.expansion:
downsample = nn.Sequential(
self.conv(self.inplanes, planes * block.expansion,
kernel_size=1, stride=stride, dilation=max(1, dilation/2), bias=False),
self.norm(planes * block.expansion),
)
layers = []
layers.append(block(self.inplanes, planes, stride, downsample, dilation=max(1, dilation/2), conv=self.conv, norm=self.norm))
self.inplanes = planes * block.expansion
for i in range(1, blocks):
layers.append(block(self.inplanes, planes, dilation=dilation, conv=self.conv, norm=self.norm))
return nn.Sequential(*layers)
def forward(self, x):
size = (x.shape[2], x.shape[3])
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 = self.aspp(x)
x = nn.Upsample(size, mode='bilinear', align_corners=NN_UPSAMPLE_ALIGN_CORNERS)(x)
return x
def resnet50(pretrained=False, **kwargs):
"""Constructs a ResNet-50 model.
Args:
pretrained (bool): If True, returns a model pre-trained on ImageNet
"""
model = ResNet(Bottleneck, [3, 4, 6, 3], **kwargs)
if pretrained:
model.load_state_dict(model_zoo.load_url(model_urls['resnet50']))
return model
def resnet101(pretrained=False, num_groups=None, weight_std=False, **kwargs):
"""Constructs a ResNet-101 model.
Args:
pretrained (bool): If True, returns a model pre-trained on ImageNet
"""
model = ResNet(Bottleneck, [3, 4, 23, 3], num_groups=num_groups, weight_std=weight_std, **kwargs)
if pretrained:
model_dict = model.state_dict()
if num_groups and weight_std:
pretrained_dict = torch.load('deeplab_model/R-101-GN-WS.pth.tar')
overlap_dict = {k[7:]: v for k, v in pretrained_dict.items() if k[7:] in model_dict}
assert len(overlap_dict) == 312
elif not num_groups and not weight_std:
pretrained_dict = model_zoo.load_url(model_urls['resnet101'])
overlap_dict = {k: v for k, v in pretrained_dict.items() if k in model_dict}
else:
raise ValueError('Currently only support BN or GN+WS')
model_dict.update(overlap_dict)
model.load_state_dict(model_dict)
return model
def resnet152(pretrained=False, **kwargs):
"""Constructs a ResNet-152 model.
Args:
pretrained (bool): If True, returns a model pre-trained on ImageNet
"""
model = ResNet(Bottleneck, [3, 8, 36, 3], **kwargs)
if pretrained:
model.load_state_dict(model_zoo.load_url(model_urls['resnet152']))
return model
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