larroy commented on issue #15024: Add second order gradient for a list of basic operators URL: https://github.com/apache/incubator-mxnet/pull/15024#issuecomment-494488095 Can you link to your original PR since it had some comments related to this patch? LGTM to merge in the development branch. A comment in imperative.cc about the inputs that require gradients could help clarify as it's not trivial to understand.
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