larroy commented on issue #13409: [MXNET-1234] Fix shape inference problems in Activation backward URL: https://github.com/apache/incubator-mxnet/pull/13409#issuecomment-443766180 One more clarification, shape inference doesn't fail in python because it doesn't call the operator using imperative. Such as Imperative::Invoke -> MXImperativeInvokeImpl which is going to call SetShapeType and thus fail on shape inference.
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