szha commented on issue #11097: fix nd.backward when out_grad is None URL: https://github.com/apache/incubator-mxnet/pull/11097#issuecomment-393362884 What happens currently is https://github.com/apache/incubator-mxnet/blob/master/src/c_api/c_api_ndarray.cc#L352 which matches https://en.cppreference.com/w/cpp/language/reinterpret_cast (explanation 4) and then https://github.com/apache/incubator-mxnet/blob/master/src/imperative/imperative.cc#L389-L395
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