ReplicationPad accepts 0-dim batch size. (#39137)
Summary:
This PR patches the ReplicationPad modules in `torch.nn` to be compatible with 0-dim batch sizes.
EDIT: this is part of the work on gh-12013 (make all nn layers accept empty batch size)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/39137
Reviewed By: albanD
Differential Revision: D24131386
Pulled By: ngimel
fbshipit-source-id: 3d93057cbe14d72571943c8979d5937e4bbf743a
