Native ATen/Parallel backend (#20087)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/20087
ghimport-source-id: bcfc8a86abe0893e4a380fe6f6123e2082ba4317
Differential Revision: D15248663
Pulled By: ilia-cher
fbshipit-source-id: fdb7a8860c85d8202026b629cb7fa344782bd2c4
