Generate only one Type class per backend (#19295)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/19295
ghimport-source-id: 9345110f91f044a449804ddd5116cc9179444a00
Differential Revision: D14948581
Pulled By: li-roy
fbshipit-source-id: a317b03d58d621e8df162918038f7543bfb13ba2
