pytorch

b4c7afe1 - [pytree] Require serialized_type_name (#119718)

[pytree] Require serialized_type_name (#119718) Differential Revision: [D53785493](https://our.internmc.facebook.com/intern/diff/D53785493) Pull Request resolved: https://github.com/pytorch/pytorch/pull/119718 Approved by: https://github.com/suo