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85ace01f - 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: D110803133 fbshipit-source-id: a5829373cc535ea54d42931bca3429b7099662bf