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423645da - 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: jeanschmidt Differential Revision: D111722899 fbshipit-source-id: fe835264b63ddab27e86a65686d11aedf3021584