pytorch

068d35a6 - Make PartialTensot a torch.Tensor subclass

Make PartialTensot a torch.Tensor subclass Pull Request resolved: https://github.com/pytorch/pytorch/pull/77626 Differential Revision: [D36435152](https://our.internmc.facebook.com/intern/diff/D36435152/) Approved by: https://github.com/wanchaol