larroy commented on issue #15331: [fix] missing input log higher order. URL: https://github.com/apache/incubator-mxnet/pull/15331#issuecomment-511978900 I think ograd[0] is dL/dx_grad About the number of inputs, you are right that we could check. If it's more than one or two function calls I think is too much overhead and it's going to get caught with the python tests, Also if you don't return enough gradients, there's a check after calls to fgradient, so I think is not a big deal. Up to you if you can come up with something concise.
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