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76078764 - Refactor generator methods (#187690)

Refactor generator methods (#187690) Summary: Refactor `.close`, `.send` and `.throw` to follow CPython semantics. X-link: https://github.com/pytorch/pytorch/pull/187690 Approved by: https://github.com/rtimpe Reviewed By: atalman Differential Revision: D111351451 fbshipit-source-id: de9db03eb939df7be52bd1b0212aa80bd495e949