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import torch
import torch.nn as nn
import math
class se_block(nn.Module):
def __init__(self, channel, ratio=16):
super(se_block, self).__init__()
self.avg_pool = nn.AdaptiveAvgPool2d(1)
self.fc = nn.Sequential(
nn.Linear(channel, channel // ratio, bias=False),
nn.ReLU(inplace=True),
nn.Linear(channel // ratio, channel, bias=False),
nn.Sigmoid()
)
def forward(self, x):
b, c, _, _ = x.size()
y = self.avg_pool(x).view(b, c)
y = self.fc(y).view(b, c, 1, 1)
return x * y
class ChannelAttention(nn.Module):
def __init__(self, in_planes, ratio=8):
super(ChannelAttention, self).__init__()
self.avg_pool = nn.AdaptiveAvgPool2d(1)
self.max_pool = nn.AdaptiveMaxPool2d(1)
# 利用1x1卷积代替全连接
self.fc1 = nn.Conv2d(in_planes, in_planes // ratio, 1, bias=False)
self.relu1 = nn.ReLU()
self.fc2 = nn.Conv2d(in_planes // ratio, 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 cbam_block(nn.Module):
def __init__(self, channel, ratio=8, kernel_size=7):
super(cbam_block, self).__init__()
self.channelattention = ChannelAttention(channel, ratio=ratio)
self.spatialattention = SpatialAttention(kernel_size=kernel_size)
def forward(self, x):
x = x*self.channelattention(x)
x = x*self.spatialattention(x)
return x
class eca_block(nn.Module):
def __init__(self, channel, b=1, gamma=2):
super(eca_block, self).__init__()
kernel_size = int(abs((math.log(channel, 2) + b) / gamma))
kernel_size = kernel_size if kernel_size % 2 else kernel_size + 1
self.avg_pool = nn.AdaptiveAvgPool2d(1)
self.conv = nn.Conv1d(1, 1, kernel_size=kernel_size, padding=(kernel_size - 1) // 2, bias=False)
self.sigmoid = nn.Sigmoid()
def forward(self, x):
y = self.avg_pool(x)
y = self.conv(y.squeeze(-1).transpose(-1, -2)).transpose(-1, -2).unsqueeze(-1)
y = self.sigmoid(y)
return x * y.expand_as(x)
class CA_Block(nn.Module):
def __init__(self, channel, reduction=16):
super(CA_Block, self).__init__()
self.conv_1x1 = nn.Conv2d(in_channels=channel, out_channels=channel//reduction, kernel_size=1, stride=1, bias=False)
self.relu = nn.ReLU()
self.bn = nn.BatchNorm2d(channel//reduction)
self.F_h = nn.Conv2d(in_channels=channel//reduction, out_channels=channel, kernel_size=1, stride=1, bias=False)
self.F_w = nn.Conv2d(in_channels=channel//reduction, out_channels=channel, kernel_size=1, stride=1, bias=False)
self.sigmoid_h = nn.Sigmoid()
self.sigmoid_w = nn.Sigmoid()
def forward(self, x):
_, _, h, w = x.size()
x_h = torch.mean(x, dim = 3, keepdim = True).permute(0, 1, 3, 2)
x_w = torch.mean(x, dim = 2, keepdim = True)
x_cat_conv_relu = self.relu(self.bn(self.conv_1x1(torch.cat((x_h, x_w), 3))))
x_cat_conv_split_h, x_cat_conv_split_w = x_cat_conv_relu.split([h, w], 3)
s_h = self.sigmoid_h(self.F_h(x_cat_conv_split_h.permute(0, 1, 3, 2)))
s_w = self.sigmoid_w(self.F_w(x_cat_conv_split_w))
out = x * s_h.expand_as(x) * s_w.expand_as(x)
return out
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