Removes pinned version for pytest

[syed-ahmed]

Unless 7.4.0 is actually required, we should remove this so that pip is able to resolve dependencies in other environments:

ERROR: Cannot install pytest==7.4.0 because these package versions have conflicting dependencies.                                                                                                    
                                                                                                                                                                                                     
The conflict is caused by:                                                                                                                                                                           
    The user requested pytest==7.4.0                                                                                                                                                                 
    The user requested (constraint) pytest==8.1.1                                                                                                                                                    

To fix this you could try to:
1. loosen the range of package versions you've specified
2. remove package versions to allow pip to attempt to solve the dependency conflict

ERROR: ResolutionImpossible: for help visit https://pip.pypa.io/en/latest/topics/dependency-resolution/#dealing-with-dependency-conflicts

[pytorch-bot]

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❌ 1 New Failure

As of commit e0ba155 with merge base 12467d2 ():

NEW FAILURE - The following job has failed:

• Run TorchAO Experimental Tests / test-mps-ops (macos-m1-stable) (gh)
  Process completed with exit code 1.

This comment was automatically generated by Dr. CI and updates every 15 minutes.

[jerryzh168]

seems to be OK to me, cc @msaroufim @drisspg @atalman ?

[msaroufim]

IIRC we wanted to get rid of pytest entirely, might be time to accelerate the transition?

[jerryzh168]

@msaroufim I see, then we'll need to finish this one: #1621

[drisspg]

We use pretty minimal set of the PyTest features so I think it is this is fine for now, unless the failures in this PR are in fact caused by unpinning

[jerryzh168]

CI errors might be related I think, @syed-ahmed can you confirm

[syed-ahmed]

@jerryzh168 Yeah, looks like the errors are real. It's happening because pytest does have a new requirement: pytorch/pytorch#127517. Looks like we workaround it: pytorch/pytorch#136158 and that's why the CI passes for PyTorch 2.6 and 2.7.

I've added a dev-requirements-overrides: "s/^pytest$/pytest==7.4.0/" in the github workflow of the 2.5 tests, and we can remove it after the next PyTorch release. Is that ok?

[msaroufim]

@metascroy @manuelcandales seems like the MPS jobs are failing consistently on this and other PRs

[msaroufim]

Actually I messed up merging this, I didn't realize sentencepiece has some test utilities at build time

[msaroufim]

Actually I did not mess up seems like it's a flake and occurs even if i downgrade pytest again #2166

Main is healthy