add torch.nn.Identity to __init__.pyi.in (#25777)
Summary:
I fixed https://github.com/pytorch/pytorch/issues/25694. Check it, please.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/25777
Differential Revision: D17228224
Pulled By: ezyang
fbshipit-source-id: a8d36240892bcb7e669b8dce38419ff3fc9e9afd
