pytorch

74d730c0 - implement NumPy-like functionality column_stack, row_stack (#46313)

implement NumPy-like functionality column_stack, row_stack (#46313) Summary: Related https://github.com/pytorch/pytorch/issues/38349 This PR implements `column_stack` as the composite ops of `torch.reshape` and `torch.hstack`, and makes `row_stack` as the alias of `torch.vstack`. Todo - [x] docs - [x] alias pattern for `row_stack` Pull Request resolved: https://github.com/pytorch/pytorch/pull/46313 Reviewed By: ngimel Differential Revision: D24585471 Pulled By: mruberry fbshipit-source-id: 62fc0ffd43d051dc3ecf386a3e9c0b89086c1d1c