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pytorch torch.nn.AdaptiveAvgPool2d()自适应平均池化函数详解
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如题：只需要给定输出特征图的大小就好，其中通道数前后不发生变化。具体如下：

AdaptiveAvgPool2d

CLASStorch.nn.AdaptiveAvgPool2d(output_size)[SOURCE]

Applies a 2D adaptive average pooling over an input signal composed of several input planes.

The output is of size H x W, for any input size. The number of output features is equal to the number of input planes.

Parameters

output_size – the target output size of the image of the form H x W. Can be a tuple (H, W) or a single H for a square image H x H. H and W can be either a int, or None which means the size will be the same as that of the input.

Examples 

> # target output size of 5x7
> m = nn.AdaptiveAvgPool2d((5,7))
> input = torch.randn(1, 64, 8, 9)
> output = m(input)
> # target output size of 7x7 (square)
> m = nn.AdaptiveAvgPool2d(7)
> input = torch.randn(1, 64, 10, 9)
> output = m(input)
> # target output size of 10x7
> m = nn.AdaptiveMaxPool2d((None, 7))
> input = torch.randn(1, 64, 10, 9)
> output = m(input)

> input = torch.randn(1, 3, 3, 3)
> input
tensor([[[[ 0.6574, 1.5219, -1.3590],
   [-0.1561, 2.7337, -1.8701],
   [-0.8572, 1.0238, -1.9784]],
 
   [[ 0.4284, 1.4862, 0.3352],
   [-0.7796, -0.8020, -0.1243],
   [-1.2461, -1.7069, 0.1517]],
 
   [[ 1.4593, -0.1287, 0.5369],
   [ 0.6562, 0.0616, 0.2611],
   [-1.0301, 0.4097, -1.9269]]]])
> m = nn.AdaptiveAvgPool2d((2, 2))
> output = m(input)
> output
tensor([[[[ 1.1892, 0.2566],
   [ 0.6860, -0.0227]],
 
   [[ 0.0833, 0.2238],
   [-1.1337, -0.6204]],
 
   [[ 0.5121, 0.1827],
   [ 0.0243, -0.2986]]]])
> 0.6574+1.5219+2.7337-0.1561
4.7569
> 4.7569/4
1.189225
>

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