Step 2: Rename _unique_dim2_temporary_will_remove_soon to unique_dim (#18649)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/18649
ghimport-source-id: 3411d240a6af5fe299a889667964730184e30645
Differential Revision: D14888292
Pulled By: VitalyFedyunin
fbshipit-source-id: 80da83c264598f74ab8decb165da4a1ce2b352bb
