kshitij12345 commented on issue #15759: [Optimizer][Bug] Gradient is mutated in the Adam optimizer URL: https://github.com/apache/incubator-mxnet/issues/15759#issuecomment-519123246 On looking at other optimizer's updater, These are the cases where original grad is being updated. Will update the PR accordingly. **RMSPropAlexUpdate** https://github.com/apache/incubator-mxnet/blob/71861238743fcd8177afe52d1562d9078ac547de/src/operator/optimizer_op-inl.h#L1600-L1619 **RMSPropUpdate** https://github.com/apache/incubator-mxnet/blob/71861238743fcd8177afe52d1562d9078ac547de/src/operator/optimizer_op-inl.h#L1691-L1708 **FtrlUpdate** https://github.com/apache/incubator-mxnet/blob/71861238743fcd8177afe52d1562d9078ac547de/src/operator/optimizer_op-inl.h#L1784-L1803
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