Renovate pre-commit + CI a bit

.github/scripts/build-cpu.sh

@@ -4,7 +4,7 @@ declare build_os
 
 set -xeuo pipefail
 
-pip install cmake==3.28.3
+uv tool install cmake==3.28.3
 
 if [ "${build_os:0:5}" == macos ] && [ "${build_arch}" == aarch64 ]; then
 	cmake -DCMAKE_OSX_ARCHITECTURES=arm64 -DCOMPUTE_BACKEND=cpu .

.github/scripts/build-cuda.sh

@@ -27,7 +27,7 @@ else
     [[ "${cuda_version}" == 13.*.* ]] && build_capability="75;80;86;89;90;100;120"
 fi
 
-[[ "${build_os}" = windows-* ]] && python3 -m pip install ninja
+uv tool install ninja cmake==3.28.3
 
 if [ "${build_os:0:6}" == ubuntu ]; then
     # We'll use Rocky Linux 8 in order to maintain manylinux 2.24 compatibility.
@@ -41,7 +41,6 @@ if [ "${build_os:0:6}" == ubuntu ]; then
         && cmake -DCOMPUTE_BACKEND=cuda -DCOMPUTE_CAPABILITY=\"${build_capability}\" . \
         && cmake --build . --config Release"
 else
-    pip install cmake==3.28.3
     cmake -G Ninja -DCOMPUTE_BACKEND=cuda -DCOMPUTE_CAPABILITY="${build_capability}" -DCMAKE_BUILD_TYPE=Release -S .
     cmake --build . --config Release
 fi

.github/scripts/build-rocm.sh

@@ -18,7 +18,7 @@ if [ "${build_os:0:6}" == ubuntu ]; then
     docker run --rm --platform "linux/$build_arch" -i \
         -w /src -v "$PWD:/src" "$image" sh -c \
         "apt-get update \
-      && pip install cmake==3.31.6 \
+      && uv tool install cmake==3.31.6 \
       && cmake -DCOMPUTE_BACKEND=hip -DCMAKE_BUILD_TYPE=MinSizeRel -DCMAKE_HIP_FLAGS=\"--offload-compress\" -DBNB_ROCM_ARCH=\"${bnb_rocm_arch}\" . \
       && cmake --build ."
 fi

.github/workflows/lint.yml

@@ -10,10 +10,15 @@ jobs:
   Lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v4
+      - uses: actions/checkout@v6
+      - uses: astral-sh/setup-uv@61cb8a9741eeb8a550a1b8544337180c0fc8476b # v7.2.0
         with:
-          python-version: "3.12"
-      - uses: pre-commit/action@v3.0.0
+          enable-cache: true
+          cache-dependency-glob: '.pre-commit-config.yaml'
+      - uses: actions/cache@v5
+        with:
+          path: ~/.cache/pre-commit
+          key: pre-commit-3|${{ hashFiles('.pre-commit-config.yaml') }}
+      - run: uv run --python=3.14 --no-sync --with pre-commit-uv pre-commit run --show-diff-on-failure --color=always --all-files
         env:
           RUFF_OUTPUT_FORMAT: github

.github/workflows/python-package.yml

@@ -42,17 +42,17 @@ jobs:
             arch: arm64
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Setup MSVC
         if: startsWith(matrix.os, 'windows')
-        uses: ilammy/msvc-dev-cmd@v1.13.0 # to use cl
+        uses: ilammy/msvc-dev-cmd@0b201ec74fa43914dc39ae48a89fd1d8cb592756 # v1.13.0, to use cl
       - name: Build C++
         run: bash .github/scripts/build-cpu.sh
         env:
           build_os: ${{ matrix.os }}
           build_arch: ${{ matrix.arch }}
       - name: Upload build artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: shared_library_${{ matrix.os }}_${{ matrix.arch }}
           path: output/*
@@ -77,9 +77,9 @@ jobs:
           ["11.8.0", "12.0.1", "12.1.1", "12.2.2", "12.3.2", "12.4.1", "12.5.1", "12.6.3", "12.8.1", "12.9.1", "13.0.2"]
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         # Windows: We install Cuda on the agent (slow)
-      - uses: Jimver/cuda-toolkit@6008063726ffe3309d1b22e413d9e88fed91a2f2 # v0.2.29
+      - uses: Jimver/cuda-toolkit@b6fc3a9f3f15256d9d94ffe1254f9c5a2565cde6 # v0.2.30
         if: startsWith(matrix.os, 'windows')
         id: cuda-toolkit
         with:
@@ -92,15 +92,15 @@ jobs:
           log-file-suffix: ${{matrix.os}}-${{matrix.cuda_version}}.txt
       - name: Setup MSVC
         if: startsWith(matrix.os, 'windows')
-        uses: ilammy/msvc-dev-cmd@v1.13.0 # to use cl
+        uses: ilammy/msvc-dev-cmd@0b201ec74fa43914dc39ae48a89fd1d8cb592756 # v1.13.0, to use cl
       - name: Build C++
         run: bash .github/scripts/build-cuda.sh
         env:
           build_os: ${{ matrix.os }}
           build_arch: ${{ matrix.arch }}
           cuda_version: ${{ matrix.cuda_version }}
       - name: Upload build artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: shared_library_cuda_${{ matrix.os }}_${{ matrix.arch }}_${{ matrix.cuda_version }}
           path: output/*
@@ -112,7 +112,7 @@ jobs:
         os: [ubuntu-22.04, windows-2025]
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Build C++ (Linux)
         if: runner.os == 'Linux'
         run: bash .github/scripts/build-xpu.sh
@@ -125,7 +125,7 @@ jobs:
         env:
           build_os: ${{ matrix.os }}
       - name: Upload build artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: shared_library_xpu_${{ matrix.os }}_x86_64
           path: output/*
@@ -139,7 +139,10 @@ jobs:
         rocm_version: ["6.2.4", "6.3.4", "6.4.4", "7.0.2", "7.1"]
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
+      - uses: astral-sh/setup-uv@61cb8a9741eeb8a550a1b8544337180c0fc8476b
+        with:
+          python-version: '3.14'
       - name: Clean up disk space
         run: |
           echo "Disk space before cleanup:"
@@ -163,7 +166,7 @@ jobs:
           build_arch: ${{ matrix.arch }}
           rocm_version: ${{ matrix.rocm_version }}
       - name: Upload build artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: shared_library_rocm_${{ matrix.os }}_${{ matrix.arch }}_${{ matrix.rocm_version }}
           path: output/*
@@ -196,9 +199,9 @@ jobs:
         python-version: ["3.10"]
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Download build artifacts
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v7
         with:
           merge-multiple: true
           pattern: "shared_library*_${{ matrix.os }}_${{ matrix.arch }}*"
@@ -209,20 +212,19 @@ jobs:
           ls -lR output/
           cp output/${{ matrix.os }}/${{ matrix.arch }}/* bitsandbytes/
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v5
+        uses: astral-sh/setup-uv@61cb8a9741eeb8a550a1b8544337180c0fc8476b # v7.2.0
         with:
           python-version: ${{ matrix.python-version }}
-          cache: pip
-      - run: pip install build wheel
-      - run: python -m build .
+          enable-cache: 'true'
+      - run: uv build
       - name: Determine and Set Platform Tag, then Tag Wheel
         shell: bash
         run: |
           PLATFORM_TAG=$(python .github/scripts/set_platform_tag.py "${{ matrix.arch }}")
           echo "PLATFORM_TAG=$PLATFORM_TAG"
-          wheel tags --remove --abi-tag=none --python-tag=py3 --platform-tag=$PLATFORM_TAG dist/bitsandbytes-*.whl
+          uvx wheel tags --remove --abi-tag=none --python-tag=py3 --platform-tag=$PLATFORM_TAG dist/bitsandbytes-*.whl
       - name: Upload build artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: bdist_wheel_${{ matrix.os }}_${{ matrix.arch }}
           path: dist/bitsandbytes-*.whl
@@ -238,7 +240,7 @@ jobs:
       - build-wheels
     steps:
       - name: Download and rename artifacts
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v7
         with:
           path: tmp/
           pattern: "bdist_wheel_*"
@@ -279,7 +281,7 @@ jobs:
       - name: Inspect wheels directory after renaming files
         run: ls -alFR wheels/
 
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           path: repo
 
@@ -348,7 +350,7 @@ jobs:
           cat body.md
 
       - name: Create new pre-release and upload artifacts
-        uses: softprops/action-gh-release@v2.2.1
+        uses: softprops/action-gh-release@a06a81a03ee405af7f2048a818ed3f03bbf83c7b # v2.5.0
         with:
           files: wheels/*.whl
           prerelease: true
@@ -372,18 +374,14 @@ jobs:
     env:
       PIP_DISABLE_PIP_VERSION_CHECK: 1
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Download wheel
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v7
         with:
           name: bdist_wheel_${{ matrix.os }}_${{ matrix.arch }}
           path: wheels/
-      - name: Set up Python
-        uses: actions/setup-python@v5
-        with:
-          python-version: "3.12"
-      - run: pip install auditwheel
-      - run: python ./.github/scripts/auditwheel_show.py wheels/* | tee $GITHUB_STEP_SUMMARY
+      - uses: astral-sh/setup-uv@61cb8a9741eeb8a550a1b8544337180c0fc8476b # v7.2.0
+      - run: uv run --no-sync --with=auditwheel ./.github/scripts/auditwheel_show.py wheels/* | tee $GITHUB_STEP_SUMMARY
 
   publish-wheels:
     name: Publish wheels to PyPI
@@ -399,13 +397,13 @@ jobs:
       id-token: write
     steps:
       - name: Download distribution artifacts
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v7
         with:
           path: dist/
           pattern: "bdist_wheel_*"
           merge-multiple: true
 
       - name: Publish to PyPI
-        uses: pypa/gh-action-pypi-publish@release/v1
+        uses: pypa/gh-action-pypi-publish@ed0c53931b1dc9bd32cbe73a98c7f6766f8a527e # v1.13.0
         with:
           print-hash: true

.github/workflows/test-runner.yml

@@ -130,7 +130,7 @@ jobs:
           echo "build_os=${BUILD_OS}" >> $GITHUB_OUTPUT
           echo "arch=${ARCH}" >> $GITHUB_OUTPUT
 
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Set build environment variables
         shell: bash
@@ -141,7 +141,7 @@ jobs:
       # Windows + CUDA: Install CUDA Toolkit
       - name: Install CUDA Toolkit
         if: inputs.backend == 'cuda' && inputs.platform == 'windows'
-        uses: Jimver/cuda-toolkit@6008063726ffe3309d1b22e413d9e88fed91a2f2 # v0.2.29
+        uses: Jimver/cuda-toolkit@b6fc3a9f3f15256d9d94ffe1254f9c5a2565cde6 # v0.2.30
         with:
           cuda: ${{ inputs.cuda_version }}
           method: "network"
@@ -151,7 +151,7 @@ jobs:
       # Windows: Setup MSVC (needed for both CPU and CUDA builds)
       - name: Setup MSVC
         if: inputs.platform == 'windows'
-        uses: ilammy/msvc-dev-cmd@v1.13.0
+        uses: ilammy/msvc-dev-cmd@0b201ec74fa43914dc39ae48a89fd1d8cb592756 # v1.13.0
 
       # Build CPU backend
       - name: Build C++
@@ -167,7 +167,7 @@ jobs:
           cuda_targets: "75;89"
 
       - name: Upload build artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: ${{ steps.config.outputs.artifact_name }}
           path: output/${{ steps.config.outputs.build_os }}/${{ steps.config.outputs.arch }}/*
@@ -184,42 +184,41 @@ jobs:
         if: inputs.backend == 'cuda'
         run: nvidia-smi
 
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Download build artifact
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v7
         with:
           name: ${{ needs.build.outputs.artifact_name }}
           path: bitsandbytes/
           merge-multiple: true
 
-      - name: Setup Python
-        uses: actions/setup-python@v5
+      - uses: astral-sh/setup-uv@61cb8a9741eeb8a550a1b8544337180c0fc8476b
         with:
           python-version: '3.10'
+          activate-environment: 'true'
 
       # Windows: Setup MSVC for torch.compile
       - name: Setup MSVC
         if: inputs.platform == 'windows'
-        uses: ilammy/msvc-dev-cmd@v1.13.0
+        uses: ilammy/msvc-dev-cmd@0b201ec74fa43914dc39ae48a89fd1d8cb592756 # v1.13.0
 
       - name: Install dependencies
         run: |
-          pip install torch==${{ inputs.torch_version }} --index-url ${{ inputs.pypi_index }}
-          pip install -e ".[test]" -v
-          pip install pytest-cov
+          uv pip install torch==${{ inputs.torch_version }} --index-url ${{ inputs.pypi_index }}
+          uv pip install pytest-cov -e ".[test]"
 
       # Windows: Downgrade NumPy for torch<2.4.1 compatibility
       # See: https://github.com/pytorch/pytorch/issues/131668
       - name: Downgrade NumPy
         if: inputs.platform == 'windows' && startsWith(inputs.torch_version, '2.3.')
-        run: pip install "numpy<2"
+        run: uv pip install "numpy<2"
 
       - name: Show installed packages
-        run: pip list
+        run: uv pip list
 
       - name: Show environment information
-        run: python -m torch.utils.collect_env
+        run: uv run -m torch.utils.collect_env
 
       - name: Run tests
-        run: pytest --durations=100
+        run: uv run pytest --durations=100

.pre-commit-config.yaml

@@ -1,13 +1,13 @@
 repos:
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.14.3
+    rev: 6ce4b4fc349b8881cbce40207dac3bf78824a88e  # frozen: v0.14.11
     hooks:
-      - id: ruff
+      - id: ruff-check
         args:
           - --fix
       - id: ruff-format
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v5.0.0
+    rev: 3e8a8703264a2f4a69428a0aa4dcb512790b2c8c  # frozen: v6.0.0
     hooks:
       - id: check-merge-conflict
       - id: check-yaml
@@ -19,11 +19,11 @@ repos:
           - --fix=lf
         exclude: '\.bat$'
   - repo: https://github.com/crate-ci/typos
-    rev: v1.26.0
+    rev: bb4666ad77b539a6b4ce4eda7ebb6de553704021  # frozen: v1.42.0
     hooks:
       - id: typos
   - repo: https://github.com/pre-commit/mirrors-clang-format
-    rev: v20.1.6
+    rev: 75ca4ad908dc4a99f57921f29b7e6c1521e10b26  # frozen: v21.1.8
     hooks:
     - id: clang-format
       types_or: [c++, c, cuda]

bitsandbytes/functional.py

@@ -241,13 +241,13 @@ def create_fp8_map(signed=True, exponent_bits=5, precision_bits=2, total_bits=8)
     has_sign = 1 if signed else 0
     assert e + p == total_bits - has_sign
     # the exponent is biased to 2^(e-1) -1 == 0
-    evalues = []
+    e_values = []
     for i, val in enumerate(range(-(2 ** (exponent_bits - has_sign)), 2 ** (exponent_bits - has_sign), 1)):
-        evalues.append(2**val)
+        e_values.append(2**val)
 
     values = []
     lst = list(itertools.product([0, 1], repeat=precision_bits))
-    # for ev in evalues:
+    # for ev in e_values:
     bias = 2 ** (exponent_bits - 1)
     for evalue in range(2 ** (exponent_bits)):
         for bit_pattern in lst:
@@ -1501,7 +1501,7 @@ def check_matmul(A, B, out, transposed_A, transposed_B, expected_type=torch.int8
 
     if not correct:
         raise ValueError(
-            f"Tensor dimensions incorrect for matrix mulitiplication: A x B: {sA} x {sB} with transpose for A x B: {tA} x {tB}.",
+            f"Tensor dimensions incorrect for matrix multiplication: A x B: {sA} x {sB} with transpose for A x B: {tA} x {tB}.",
         )
 
     return sout