Kenichi Maehashi

WIP. Part of #6999.

### Description I saw several users reporting this. I think in most cases the problem is due to the installation failure. Uninstalling all CuPy packages (`pip list` to find list...

Improve installation command

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I saw several users confusing with `cupy-cuda11x` and `cupy-cuda112...117`. This PR adds some more description of the change in CuPy v11.

`distutils` deprecation (in Python 3.10)

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`distutils` is deprecating in Python 3.10 so we should get ready for it. https://www.python.org/dev/peps/pep-0632/ NumPy: https://github.com/numpy/numpy/issues/18588 SciPy: https://github.com/scipy/scipy/issues/13615 Thanks @leofang for letting us know 😄

Use of `pkg_resources` (part of `setuptools`) is now discouraged. https://setuptools.pypa.io/en/latest/pkg_resources.html > Use of pkg_resources is discouraged in favor of [importlib.resources](https://docs.python.org/3/library/importlib.html#module-importlib.resources), [importlib.metadata](https://docs.python.org/3/library/importlib.metadata.html), and their backports ([importlib_resources](https://pypi.org/project/importlib_resources), [importlib_metadata](https://pypi.org/project/importlib_metadata)). Please consider using those...

[RFC] Introduce pre-commit

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I'd like to propose introducing [pre-commit](https://github.com/pre-commit/pre-commit) ([docs](https://pre-commit.com/)) as an engine to run static checks currently done in GitHub Actions CI. Benefits are: * All static checks done in CI can...

Use `pyproject.toml`

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The latest setuptools now supports editable install with `pyproject.toml` so I guess we can consider re-enabling `pyproject.toml`. https://twitter.com/juanluisback/status/1557734536586625025 Rel. #4619, #4727, #4734

It is better to run CPU test against various PyTorch versions.