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resnet.py
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import torch.nn as nn
import math
__all__ = ['ResNet', 'resnet18', 'resnet34', 'resnet50', 'resnet101',
'resnet152']
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',
}
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 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.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)
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.downsample = downsample
self.stride = stride
def forward(self, x):
residual = x
print('pre_Bottleneck_out\n', x.shape, x[0,0,0,:10])
out = self.conv1(x)
print('Bottleneck_conv1out\n', out.shape, out[0,0,0,:10])
out = self.bn1(out)
print('Bottleneck_conv1bn1out\n', out.shape, out[0,0,0,:10])
out = self.relu(out)
out = self.conv2(out)
print('Bottleneck_conv2out\n', out.shape, out[0,0,0,:10])
out = self.bn2(out)
out = self.relu(out)
out = self.conv3(out)
print('Bottleneck_conv3out\n', out.shape, out[0,0,0,:10])
out = self.bn3(out)
if self.downsample is not None:
residual = self.downsample(x)
print('pre_residual_out\n', out.shape, out[0,0,0,:10])
out += residual
print('pre_relu_out\n', out.shape, out[0,0,0,:10])
out = self.relu(out)
print('relu_out\n', out[0,0,0,:10])
return out
class ResNet(nn.Module):
def __init__(self, block, layers, num_classes=1000):
self.inplanes = 64
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)
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_()
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 = planes * block.expansion
for i in range(1, blocks):
layers.append(block(self.inplanes, planes))
return nn.Sequential(*layers)
def forward(self, x):
x = self.conv1(x)
print("************************************:", x[0,0,0,:10])
x = self.bn1(x)
x = self.relu(x)
x = self.maxpool(x)
print("************************************:", x[0,0,0,:10])
x = self.layer1(x)
x = self.layer2(x)
x = self.layer3(x)
x = self.layer4(x)
x = self.avgpool(x)
x = x.view(x.size(0), -1)
x = self.fc(x)
return x
def resnet101(pretrained=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], **kwargs)
return model
class Encoder(nn.Module):
"""
Encoder.
"""
def __init__(self, encoded_image_size=14):
super(Encoder, self).__init__()
self.enc_image_size = encoded_image_size
resnet = resnet101(pretrained=False) # pretrained ImageNet ResNet-101
# Remove linear and pool layers (since we're not doing classification)
modules = list(resnet.children())[:-2]
self.resnet = nn.Sequential(*modules)
# Resize image to fixed size to allow input images of variable size
self.adaptive_pool = nn.AdaptiveAvgPool2d((encoded_image_size, encoded_image_size))
self.fine_tune()
def forward(self, images):
"""
Forward propagation.
:param images: images, a tensor of dimensions (batch_size, 3, image_size, image_size)
:return: encoded images
"""
out = self.resnet(images) # (batch_size, 2048, image_size/32, image_size/32)
out = self.adaptive_pool(out) # (batch_size, 2048, encoded_image_size, encoded_image_size)
out = out.permute(0, 2, 3, 1) # (batch_size, encoded_image_size, encoded_image_size, 2048)
return out
def fine_tune(self, fine_tune=True):
"""
Allow or prevent the computation of gradients for convolutional blocks 2 through 4 of the encoder.
:param fine_tune: Allow?
"""
for p in self.resnet.parameters():
p.requires_grad = False
# If fine-tuning, only fine-tune convolutional blocks 2 through 4
for c in list(self.resnet.children())[5:]:
for p in c.parameters():
p.requires_grad = fine_tune