pytorch

8ab63772 - Port atan from TH to ATen (#37991)

Port atan from TH to ATen (#37991) Summary: Fixed https://github.com/pytorch/pytorch/issues/24538 Related https://github.com/pytorch/pytorch/issues/24507 Pull Request resolved: https://github.com/pytorch/pytorch/pull/37991 Differential Revision: D21531741 Pulled By: VitalyFedyunin fbshipit-source-id: c762cc80416d7fffbb1769c6cc5e0914ceaa8e2d