From ae948f84fc30b0cc7906439796ee984541c825d6 Mon Sep 17 00:00:00 2001
From: Priya Sundaram <oc-409d01@agentmail.to>
Date: Fri, 11 Sep 2026 17:39:42 +0000
Subject: [PATCH] =?UTF-8?q?ci:=20prep=20for=203.15t=20=E2=80=94=20install?=
 =?UTF-8?q?=20libhdf5-dev=20on=20pre-release=20Python;=20pin=20scikit-lear?=
 =?UTF-8?q?n>=3D1.9.1?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Land the non-3.15t-gated pieces of #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 #15105 as a draft until 3.15 GA.
---
 .github/workflows/build.yml  | 6 ++++++
 .github/workflows/sphinx.yml | 6 ++++++
 pyproject.toml               | 2 +-
 3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 2257bad8d618..4519c18019e9 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -20,6 +20,12 @@ jobs:
         with:
           python-version-file: .python-version
           allow-prereleases: true
+      # keras needs hdf5 on pre-release Python.
+      - run: |
+          if [ "$(python -c 'import sys; print(sys.version_info.releaselevel)')" != "final" ]; then
+            sudo apt-get update -qq
+            sudo apt-get install --yes libhdf5-dev
+          fi
       - run: uv sync --group=test
       - name: Run tests
         # opencv-python is gated out on 3.14t (no cp314t wheel yet), so skip the
diff --git a/.github/workflows/sphinx.yml b/.github/workflows/sphinx.yml
index 1672bf69407f..905e0c1ebee3 100644
--- a/.github/workflows/sphinx.yml
+++ b/.github/workflows/sphinx.yml
@@ -33,6 +33,12 @@ jobs:
         with:
           python-version-file: .python-version
           allow-prereleases: true
+      # keras needs hdf5 on pre-release Python.
+      - run: |
+          if [ "$(python -c 'import sys; print(sys.version_info.releaselevel)')" != "final" ]; then
+            sudo apt-get update -qq
+            sudo apt-get install --yes libhdf5-dev
+          fi
       - run: uv sync --group=docs
       - uses: actions/configure-pages@v6
       - run: uv run sphinx-build -c docs . docs/_build/html
diff --git a/pyproject.toml b/pyproject.toml
index 3d0dbdd05018..a8d37abac664 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,7 +23,7 @@ dependencies = [
   "pandas>=2.3.3",
   "pillow>=11.3",
   "rich>=13.9.4",
-  "scikit-learn>=1.9",
+  "scikit-learn>=1.9.1",
   "scipy>=1.18.1",
   "statsmodels>=0.14.4",
   "sympy>=1.13.3",