ci: prep for 3.15t (libhdf5 on pre-release + scikit-learn>=1.9.1) - #15283
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cclauss merged 1 commit intoSep 11, 2026
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…cikit-learn>=1.9.1 Land the non-3.15t-gated pieces of TheAlgorithms#15105 ahead of GA: - build.yml/sphinx.yml: install libhdf5-dev only when running a pre-release interpreter (keras needs hdf5 there); guarded so it is a no-op on final builds. - pyproject.toml: pin scikit-learn>=1.9.1, the first release with cp315t free-threaded wheels, so uv resolves a wheel instead of building from source. The .python-version bump to 3.15t stays in TheAlgorithms#15105 as a draft until 3.15 GA.
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Reopens #15282 (auto-closed by algorithms-keeper for unchecked boxes — checklist completed below). Splits the non-3.15t-gated changes out of #15105 so they can land before GA, as requested by @cclauss.
Describe your change:
CI / build configuration only — no algorithm changes:
.github/workflows/build.yml/.github/workflows/sphinx.yml: installlibhdf5-devonly when the interpreter is a pre-release (releaselevel != final) — keras needs hdf5 there. Guarded no-op on final Python, so nothing changes for current CI.pyproject.toml: pinscikit-learn>=1.9.1, the first release shippingcp315tfree-threaded wheels, so uv resolves a wheel rather than building from source.Deliberately not included here: the
.python-versionbump3.14t → 3.15t, which stays in #15105 as a draft until Python 3.15 GA.Ref #15081, #15105.
Checklist: