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
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>>> # 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)
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>>> 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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以上这篇pytorch torch.nn.AdaptiveAvgPool2d()自适应平均池化函数详解就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/caicaiatnbu/article/details/88955272