pytorch

b3ca7fc8 - Support saving extra files in pytorch flat buffer format via python (#77870)

Support saving extra files in pytorch flat buffer format via python (#77870) Summary: The extra files serialization paths were not exposed to the python layer for flat buffers, this diff does just that. Reviewed By: qihqi Differential Revision: D36469535 Pull Request resolved: https://github.com/pytorch/pytorch/pull/77870 Approved by: https://github.com/qihqi