Add Python 3.11 Linux CPU Unittesting

[osalpekar]

No description provided.

[pmeier]

Hey @osalpekar, supporting 3.11 for us means that we'll have to wait until the conda defaults channel supports it as well as all of our dependencies for it. Unfortunately, conda-forge is not an option since we don't want to have builds from multiple channels. Thus, we'll just have to wait for now. There is #7108 that will include your change here minus the compatibility stuff.

[osalpekar]

Using this as a branch to do experiments, and I want to try out Nikita's suggestion from here: #7049 (comment). Not necessarily planning on merging this, but using this to figure out all the blockers to 3.11 support.

[osalpekar]

Got all the 3.11 tests to run and pass, except for the 7 tests that depended on PyAV: https://github.com/pytorch/vision/actions/runs/4078992818/jobs/7029872042.

In a previous commit, pyav installation failed, but it appears there are Python 3.11 manylinux wheels available for PyAV (https://files.pythonhosted.org/packages/55/ac/8c31205c9b49ea3e0111276a2f3ea8dae42dd026cee0832e46658c9a4650/av-10.0.0-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl), so will take a closer look at why those could not be installed earlier.

[pmeier]

av==10.0.0 contains a bug that breaks our stuff. See #6790. This is why we don't install it:

vision/.circleci/unittest/linux/scripts/environment.yml

Line 16 in 135a0f9

- av < 10

vision/.github/workflows/test-linux-cpu.yml

Line 53 in 135a0f9

python3 -m pip install pytest pytest-mock 'av<10'

According to #6814 (comment), the bug was fixed so we just need to wait for the next release to be able to support av>=10.

However, you are right than all versions for av<10 don't have a wheel for Python 3.11. So not sure what to do about that.

[osalpekar]

Getting 16145 tests to pass, 7 are failing due to lack of appropriate av library which those 7 tests depend on.

[pmeier]

7 are failing due to lack of appropriate av library which those 7 tests depend on.

Nope, they are failing because we don't have any av installed. Since av is an optional dependency, we should not depend on it in the test suite either. Let me send a PR that removes this hard dependency to unblock this PR.

[pmeier]

@osalpekar Test is passing now: https://github.com/pytorch/vision/actions/runs/4144563519/jobs/7167774851

[osalpekar]

We can close this in favor of #7189