JianjianSha

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After reading the auther's interpretation above, why I think the gradient ![image](https://user-images.githubusercontent.com/46012487/163125056-c36d6c5f-e6c4-4fd1-af9e-d0a2bebd82af.png) should be propagated to i-th layer?

可能要跟板子上的 rknn toolkit2 版本匹配