CI: add sklearn versions to matrix

.github/workflows/main.yml

@@ -70,37 +70,29 @@ jobs:
   build_sdist:
     name: sdist on ${{ matrix.os }} with py ${{ matrix.ver.py }} numpy${{ matrix.ver.np }}
     runs-on: ${{ matrix.os }}
-    env:
-      SCIKIT_LEARN_DATA: ${{ github.workspace }}/.cache/scikit_learn_data
     strategy:
       fail-fast: false
       matrix:
         os:
           [ubuntu-latest, ubuntu-24.04-arm, windows-latest, macos-14]
         ver:
-          - { py: "3.9", np: "==1.20.0", sp: "==1.5.4" }
-          - { py: "3.10", np: "==1.21.6", sp: "==1.7.2" }
-          - { py: "3.11", np: "==1.23.2", sp: "==1.9.2" }
-          - { py: "3.12", np: "==1.26.2", sp: "==1.11.2" }
-          - { py: "3.13", np: "==2.1.0", sp: "==1.14.1" }
-          - { py: "3.14", np: "==2.3.2", sp: "==1.16.1" }
-          - { py: "3.14", np: ">=2.3.2", sp: ">=1.16.1" }
+          - { py: "3.9", np: "==1.20.0", sp: "==1.5.4", sk: "==0.24.0" }
+          - { py: "3.10", np: "==1.21.6", sp: "==1.7.2", sk: "==1.0.2" }
+          - { py: "3.11", np: "==1.23.2", sp: "==1.9.2", sk: "==1.1.3" }
+          - { py: "3.12", np: "==1.26.2", sp: "==1.11.2", sk: "==1.3.1" }
+          - { py: "3.13", np: "==2.1.0", sp: "==1.14.1", sk: "==1.5.2" }
+          - { py: "3.14", np: "==2.3.2", sp: "==1.16.1", sk: "==1.7.2" }
+          - { py: "3.14", np: ">=2.3.2", sp: ">=1.16.1", sk: ">=1.7.2" }
         exclude:
           - os: macos-14
-            ver: { py: "3.9", np: "==1.20.0", sp: "==1.5.4" }
+            ver: { py: "3.9", np: "==1.20.0", sp: "==1.5.4", sk: "==0.24.0" }
           - os: macos-14
-            ver: { py: "3.10", np: "==1.21.6", sp: "==1.7.2" }
+            ver: { py: "3.10", np: "==1.21.6", sp: "==1.7.2", sk: "==1.0.2" }
     steps:
       - uses: actions/checkout@v4
         with:
           fetch-depth: "0"
 
-      - name: Cache scikit-learn dataset
-        uses: actions/cache@v4
-        with:
-          path: .cache/scikit_learn_data
-          key: ${{ runner.os }}-sklearn-data
-
       - name: Set up Python ${{ matrix.ver.py }}
         uses: actions/setup-python@v5
         with:
@@ -115,12 +107,12 @@ jobs:
         run: |
           pip install -v --editable .[test]
 
-      - name: Pre-fetch scikit-learn datasets
-        run: python -c "from sklearn.datasets import fetch_california_housing; fetch_california_housing()"
+      - name: Install pinned dependencies
+        run: |
+          pip install "numpy${{ matrix.ver.np }}" "scipy${{ matrix.ver.sp }}" "scikit-learn${{ matrix.ver.sk }}"
 
       - name: Run tests
         run: |
-          pip install "numpy${{ matrix.ver.np }}" "scipy${{ matrix.ver.sp }}"
           python -m pytest -v tests/
 
       - name: Build sdist
@@ -137,20 +129,11 @@ jobs:
   coverage:
     name: coverage
     runs-on: ubuntu-latest
-    env:
-      SCIKIT_LEARN_DATA: ${{ github.workspace }}/.cache/scikit_learn_data
-
     steps:
       - uses: actions/checkout@v4
         with:
           fetch-depth: '0'
 
-      - name: Cache scikit-learn dataset
-        uses: actions/cache@v4
-        with:
-          path: .cache/scikit_learn_data
-          key: ${{ runner.os }}-sklearn-data
-
       - name: Set up Python 3.11
         uses: actions/setup-python@v5
         with:
@@ -165,9 +148,6 @@ jobs:
         run: |
           pip install -v --editable .[test]
 
-      - name: Pre-fetch scikit-learn datasets
-        run: python -c "from sklearn.datasets import fetch_california_housing; fetch_california_housing()"
-
       - name: Run tests
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}