apeforest edited a comment on issue #14613: [MXNET-978] Second order gradient support for some unary operators URL: https://github.com/apache/incubator-mxnet/pull/14613#issuecomment-499695476 To summarize from discussion in https://github.com/apache/incubator-mxnet/pull/15120, I think in MXNet we calculate input gradients based on the variables specified in the autograd.grad() API. In this case y_grad, even if a grad attribute is attached to it, no gradient values will be assigned during the second pass of `backward()`. Only the second order gradient x.grad is assigned. This behavior is different from PyTorch, but I think it is not a bug of MXNet.
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