pytorch

9984f4bb - Remove native_functions.yaml dependency from some reduction operators (#64173)

Remove native_functions.yaml dependency from some reduction operators (#64173) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/64173 This one also required restructuring the code a bit to move the kernel code into seperate files. So, I've mainly focused on CUDA which is where the real build-time issues are. Test Plan: Imported from OSS Reviewed By: jbschlosser, ezyang Differential Revision: D30728581 Pulled By: dagitses fbshipit-source-id: a69eea5b4100d16165a02660dde200c8f648683d