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ci: Ignore torch MPS warning on macOS runners - #834
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Since torch 2.15, the paravirtual GPU of GitHub's macOS runners is rejected and torch warns about it during the first backward pass, which fails the tests run with -W error. See pytorch/pytorch#202529. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Since torch 2.15, the paravirtual GPU of the GitHub macOS runners is rejected by torch, which emits
UserWarning: Skipping device Apple Paravirtual device that does not support Metal 2.0during the first backward pass. With-W error, this makes the first autogram test fail in the scheduled Checks runs since 2026-10-28.This ignores only that warning in the unit test step, with a comment pointing to pytorch/pytorch#202529 so the filter can be removed once it's fixed upstream. Our tests never use MPS, so no coverage is lost.
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