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chapter 3, resnet #16

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renping0535 opened this issue Dec 10, 2020 · 0 comments

renping0535 commented Dec 10, 2020

由于F(x)+x是逐通道进行相加，因此根据两者是否通道数相同，存在两种Bottleneck结构。对于通道数不同的情况，比如每个卷积组的第一个Bottleneck，需要利用1×1卷积对x进行Downsample操作，将通道数变为相同，再进行加操作。对于相同的情况下，两者可以直接进行相加。

这是书上第3章的描述，为什么是downsample呢？看代码不是应该对输入x进行了上采样嘛～

谢谢

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