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So far, we have relied on detection. However this turns out to be flaky for macOS, since the same Torch build can be used for CPU and Metal builds. It seems that since Torch 2.15, `mps.is_available()` starts reporting `False` on our CI machines (presumably due to not having visible Metal GPUs). The language detection is really more for non-Nix development builds. So, let's be explicit for Nix builds to avoid detection mistakes.
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So far, we have relied on detection. However this turns out to be flaky for macOS, since the same Torch build can be used for CPU and Metal builds. It seems that since Torch 2.15,
mps.is_available()starts reportingFalseon our CI machines (presumably due to not having visible Metal GPUs).The language detection is really more for non-Nix development builds. So, let's be explicit for Nix builds to avoid detection mistakes.