add missing method annotations to torch.Tensor (#30576)
Summary:
Looks like some of the tensor methods defined in https://github.com/pytorch/pytorch/blob/master/torch/tensor.py#L393 were missing.
Also add missing self object to `map_`
Pull Request resolved: https://github.com/pytorch/pytorch/pull/30576
Differential Revision: D19698355
Pulled By: ezyang
fbshipit-source-id: 6df99f17d5de11715dbe89aecb292612405c08ac
