wkcn commented on issue #14391: as_in_context() does not copy the gradient to the new context URL: https://github.com/apache/incubator-mxnet/issues/14391#issuecomment-472674519 I'm worry `copy_grad=True` will drop the performance. Assume that it takes 1s to copy the data of a large tensor, it will takes extra 1s to copy the gradient.
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