pytorch

a6f767ed - Fix issue re: DDP and create_graph=True (#63831)

Fix issue re: DDP and create_graph=True (#63831) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/63831 Closes https://github.com/pytorch/pytorch/issues/63812 `at::mul_out` is not supported when `grad` itself requires grad, which is useful for computing higher order derivatives. In this case, fall back to a mul + copy instead of mul_out. ghstack-source-id: 136614644 Test Plan: UT Reviewed By: SciPioneer Differential Revision: D30505573 fbshipit-source-id: 83532b6207b3d80116fcc4dff0e5520d73b3454f