[pytorch][improvement] Improve torch logging to identify problematic key (#45766)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/45766
As per subj, making KeyError message more verbose.
Test Plan:
Verified that breakage can be successfully investigated with verbose error message
unit tests
Reviewed By: esqu1
Differential Revision: D24080362
fbshipit-source-id: f4e22a78809e5cff65a69780d5cbbc1e8b11b2e5
