pytorch

809660ff - ATen DerivedType is dead, long live ATen RegisterDispatchKey (#47011)

ATen DerivedType is dead, long live ATen RegisterDispatchKey (#47011) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/47011 smessmer has complained about how it is difficult to find generated code. Well hopefully this diffs helps a bit with that. There are three components to this refactor: - Rename TypeDerived (CPUType) to RegisterDispatchKey (RegisterCPU). The 'Type' nomenclature is vestigial and I think Register says what these files do a lot more clearly. I also got rid of the CPUType namespace; everything just goes in anonymous namespace now, less moving parts this way. - Give Math and DefaultBackend their own files (RegisterMath and RegisterDefaultBackend) - Restructure code generation so that schema definition is done completely separately from RegisterDispatchKey I decided to name the files RegisterCPU rather than the old convention BackendSelectRegister, because it seems better to me if these files clump together in an alphabetical listing rather than being spread out everywhere. There are a few manual registration files which should probably get similar renaming. I also did a little garden cleaning about how we identify if a dispatch key is a cuda key or a generic key (previously called KEYWORD_ALL_BACKENDS but I like my naming better). Signed-off-by: Edward Z. Yang <ezyang@fb.com> Differential Revision: D24600806 Test Plan: Imported from OSS Reviewed By: smessmer Pulled By: ezyang fbshipit-source-id: c1b510dd7515bd95e3ad25b8edf961b2fb30a25a