Yolo_Nano
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A question about FCA
FCA in this code is the same as the python representation of the famous senet module. Why?
class FCA(nn.Module):
#Module structure FCA some like
def __init__(self, channels, reduce_channels):
super(FCA, self).__init__()
self.channels = channels
self.avg_pool = nn.AdaptiveAvgPool2d(1)
self.fc = nn.Sequential(
nn.Linear(channels, reduce_channels, bias=False),
nn.ReLU6(inplace=True),
nn.Linear(reduce_channels, channels, bias=False),
nn.Sigmoid()
)
def forward(self, x):
b, c, _, _ = x.size()
out = self.avg_pool(x).view(b, c)
out = self.fc(out).view(b, c, 1, 1)
out = x * out.expand_as(x)
return out
class SELayer(nn.Module):
def __init__(self, channel, reduction=16):
super(SELayer, self).__init__()
self.avg_pool = nn.AdaptiveAvgPool2d(1)
self.fc = nn.Sequential(
nn.Linear(channel, channel // reduction, bias=False),
nn.ReLU(inplace=True),
nn.Linear(channel // reduction, 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.expand_as(x)