Refactor Random Number Generators in ATen (#21364)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/21364
ghimport-source-id: ca7d37e10190ba46dc8512f437404ca9216d3369
Differential Revision: D15696497
Pulled By: ezyang
fbshipit-source-id: 2e713b8566ae915e175b5a79ac1dd9b86cc2a23d
