Squeeze-and-Excitation Networks（SENet）

结构和代码如下（参考：b站视频：YOLOv5 v6.1添加SE,CA,CBAM,ECA注意力机制教学，即插即用）：

Global pooling：每个channel上面的所有点做平均，这样每个channel都输出一个数。所以左图中，HxWxC变成了1x1xC。（参考：关于global average pooling理解和介绍）
FC就是全连接层。

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