provide "size" parameter in torch.normal when called with two floats (#20545)
Summary:
This has been requested in https://github.com/pytorch/pytorch/issues/20323
(It is still not exactly the same as NumPy, which allows you to pass tensors at mean/std and broadcast them with size, but the present PR is extremely simple and does the main thing people are asking for)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/20545
Differential Revision: D15358736
Pulled By: zhangguanheng66
fbshipit-source-id: 762ea5eab5b8667afbac2df0137df017ba6e413c
