Let set_rng_state and get_rng_state accept string parameter (#23448)
Summary:
Currently set_rng_state and get_rng_state do not accept string as their parameters. This commit let them accept strings.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/23448
Differential Revision: D16527172
Pulled By: soumith
fbshipit-source-id: 8f9a2129979706e16877cc110f104770fbbe952c
