pytorch

85b25257 - [package] Use custom persistent_load in PackageImporter (#51595)

[package] Use custom persistent_load in PackageImporter (#51595) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/51595 Right now `PackageExporter` defines its own `persistent_id` but `PackageImporter` uses the one defined in `torch.serialization`. I have some downstream plans to customize this so this PR just splits it out. Not to fear! I know this introduces some duplication and potential for different behavior between `torch.save` and `torch.package`, but I have plans to re-unify them soon. Test Plan: Imported from OSS Reviewed By: zdevito Differential Revision: D26211578 Pulled By: suo fbshipit-source-id: 48a2ccaefb2525e1498ad68b75c46d9de3d479b7