Added numpy conversion (#18505)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/18505
ghimport-source-id: f3c9b9251e5793f9e192f587194ddfebb45facc1
Stack from [ghstack](https://github.com/ezyang/ghstack):
* **#18505 [WIP]Added numpy conversion**
* #18166 Bool Tensor for CUDA
Differential Revision: D14646403
fbshipit-source-id: 79d39d692c778ce1981c1d35b1c33e3d93111041
