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* Add pytorch-direct version

* remove

* add documentation for UnifiedTensor

* Revert "add documentation for UnifiedTensor"

This reverts commit 63ba42644d4aba197c1cb4ea4b85fa1bc43b8849.

* add UnifiedTensor documentation

* Update python/dgl/contrib/unified_tensor.py
Co-authored-by: xiang song(charlie.song) <classicxsong@gmail.com>
Co-authored-by: shhssdm <shhssdm@gmail.com>
Co-authored-by: xiang song(charlie.song) <classicxsong@gmail.com>