Fix max_concurrent instance check and error message

[mirceamironenco]

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Changes

• I assume this check was meant to ensure that max_concurrent <= num_workers? I changed the isinstance check and modified the error message accordingly.

[divyanshk]

Thanks for fixing this, looks good to me!

[pytorch-bot]

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✅ No Failures

As of commit 5804e04 with merge base e25df94 ():
💚 Looks good so far! There are no failures yet. 💚

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[mirceamironenco]

Is there anything needed from my side here? Seems like these are failing for an unrelated reason?

[andrewkho]

These test failures look like they're pre-existing and unrelated, thanks for the PR
@mirceamironenco !

[andrewkho]

Rebasing and re-starting CI