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This change adds support for noarch build variants. So far we have used the universal variant for kernels that do not have any AoT-compiled code. However, the universal variant has two important issues: 1. A kernel without AoT-compiled might still be backend-specific. E.g. NVIDIA CuTe-based kernels are not universal in the sense that they don't work on non-NVIDIA GPUs. 2. We cannot specify dependencies per backend. To solve these issues, we introduce the noarch variants to replace universal kernels. Noarch kernels have variants of the shape `torch-<backend>` (e.g. `torch-xpu`). This resolves the issues outlined. This change introduces support for loading noarch kernels. In the future, we will start emitting deprecation warnings for universal kernels (to eventually remove support).
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MekkCyber
previously approved these changes
Dec 3, 2025
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| assert variant_path is not None | ||
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not really needed but okay to keep it
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It is necessary to communicate to the type checker that at that point variant_path cannot be None anymore (mypy will fail without the assert).
MekkCyber
approved these changes
Dec 3, 2025
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This change adds support for noarch build variants. So far we have used the universal variant for kernels that do not have any AoT-compiled code. However, the universal variant has two important issues:
To solve these issues, we introduce the noarch variants to replace universal kernels. Noarch kernels have variants of the shape
torch-<backend>(e.g.torch-xpu). This resolves the issues outlined.This change introduces support for loading noarch kernels. In the future, we will start emitting deprecation warnings for universal kernels (to eventually remove support).
This change also fixes some small issues with CPU kernels that surfaced while making a test for noarch.