2D-DCT: ($F_{iv}$: each second cell of DCT formula and $s_{ij}$)

$$ F_{iv}=\alpha(v)\Sigma_{i=0}^{n-1}s_{ij}cos\frac{(2j+1)v\pi}{2N} $$

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stride: 步幅

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(考过)

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num of trainable parameters: filter width* filter height * input channels(if RGB, 3) * output channnels(output feature map number)

hierarchical 层级结构