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111 lines
3.1 KiB
111 lines
3.1 KiB
2 years ago
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import math
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import torch.nn as nn
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class CA_layer(nn.Module):
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def __init__(self, channel, reduction=16):
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super(CA_layer, self).__init__()
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# global average pooling
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self.gap = nn.AdaptiveAvgPool2d(1)
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self.fc = nn.Sequential(
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nn.Conv2d(channel, channel // reduction, kernel_size=(1, 1), bias=False),
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nn.GELU(),
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nn.Conv2d(channel // reduction, channel, kernel_size=(1, 1), bias=False),
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# nn.Sigmoid()
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)
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def forward(self, x):
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y = self.fc(self.gap(x))
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return x * y.expand_as(x)
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class Simple_CA_layer(nn.Module):
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def __init__(self, channel):
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super(Simple_CA_layer, self).__init__()
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self.gap = nn.AdaptiveAvgPool2d(1)
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self.fc = nn.Conv2d(
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in_channels=channel,
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out_channels=channel,
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kernel_size=1,
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padding=0,
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stride=1,
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groups=1,
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bias=True,
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)
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def forward(self, x):
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return x * self.fc(self.gap(x))
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class ECA_layer(nn.Module):
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"""Constructs a ECA module.
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Args:
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channel: Number of channels of the input feature map
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k_size: Adaptive selection of kernel size
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"""
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def __init__(self, channel):
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super(ECA_layer, self).__init__()
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b = 1
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gamma = 2
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k_size = int(abs(math.log(channel, 2) + b) / gamma)
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k_size = k_size if k_size % 2 else k_size + 1
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self.avg_pool = nn.AdaptiveAvgPool2d(1)
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self.conv = nn.Conv1d(
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1, 1, kernel_size=k_size, padding=(k_size - 1) // 2, bias=False
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)
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# self.sigmoid = nn.Sigmoid()
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def forward(self, x):
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# x: input features with shape [b, c, h, w]
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# b, c, h, w = x.size()
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# feature descriptor on the global spatial information
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y = self.avg_pool(x)
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# Two different branches of ECA module
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y = self.conv(y.squeeze(-1).transpose(-1, -2)).transpose(-1, -2).unsqueeze(-1)
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# Multi-scale information fusion
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# y = self.sigmoid(y)
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return x * y.expand_as(x)
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class ECA_MaxPool_layer(nn.Module):
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"""Constructs a ECA module.
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Args:
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channel: Number of channels of the input feature map
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k_size: Adaptive selection of kernel size
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"""
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def __init__(self, channel):
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super(ECA_MaxPool_layer, self).__init__()
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b = 1
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gamma = 2
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k_size = int(abs(math.log(channel, 2) + b) / gamma)
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k_size = k_size if k_size % 2 else k_size + 1
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self.max_pool = nn.AdaptiveMaxPool2d(1)
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self.conv = nn.Conv1d(
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1, 1, kernel_size=k_size, padding=(k_size - 1) // 2, bias=False
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)
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# self.sigmoid = nn.Sigmoid()
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def forward(self, x):
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# x: input features with shape [b, c, h, w]
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# b, c, h, w = x.size()
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# feature descriptor on the global spatial information
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y = self.max_pool(x)
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# Two different branches of ECA module
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y = self.conv(y.squeeze(-1).transpose(-1, -2)).transpose(-1, -2).unsqueeze(-1)
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# Multi-scale information fusion
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# y = self.sigmoid(y)
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return x * y.expand_as(x)
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