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51ed2299 - Use proper sources for constructing dataclass defaults (#157993)

Use proper sources for constructing dataclass defaults (#157993) Summary: Partially fixes https://github.com/pytorch/pytorch/issues/154009 X-link: https://github.com/pytorch/pytorch/pull/157993 Approved by: https://github.com/williamwen42, https://github.com/anijain2305 Reviewed By: wdvr Differential Revision: D78599676 fbshipit-source-id: 06baa54a73d6e8bbad7faf2f167425691658aee5