pytorch torch.nn.AdaptiveAvgPool2d()自适应平均池化函数详解

>>> # 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
>>>