Use uv in macOS CI

Author: zcbenz

.github/actions/build-macos-release/action.yml

@@ -21,7 +21,7 @@ runs:
         DEVELOPER_DIR: /Applications/Xcode-latest.app
         MACOSX_DEPLOYMENT_TARGET: ${{ inputs.macos-target }}
       run: |
-        pip install build
+        uv pip install build
         python setup.py clean --all
         MLX_BUILD_STAGE=1 python -m build -w
 

.github/actions/build-macos/action.yml

@@ -4,20 +4,18 @@ description: 'Build and test MLX on macOS'
 runs:
   using: "composite"
   steps:
-    - name: Install dependencies
+    - name: Install Python package
       env:
         DEBUG: 1
         CMAKE_ARGS: "-DCMAKE_COMPILE_WARNING_AS_ERROR=ON"
       shell: bash -l {0}
       run: |
-        pip install --upgrade pip
-        pip install cmake setuptools typing_extensions
-        pip install -e ".[dev]" -v
+        uv pip install -e ".[dev]" -v
 
     - name: Install tests dependencies
       shell: bash -l {0}
       run: |
-        pip install tensorflow
+        uv pip install tensorflow
 
     - name: Run Python tests
       shell: bash -l {0}
@@ -34,7 +32,7 @@ runs:
       shell: bash -l {0}
       run: |
         cd examples/extensions
-        pip install -r requirements.txt
+        uv pip install -r requirements.txt
         python setup.py build_ext --inplace
         python test.py
     
@@ -78,5 +76,5 @@ runs:
         METAL_DEBUG_ERROR_MODE: 0
       run: |
         CMAKE_ARGS="-DMLX_METAL_JIT=ON" \
-          pip install -e . -v
+          uv pip install -e . -v
         python -m unittest discover -v python/tests

.github/actions/setup-macos/action.yml

@@ -13,12 +13,21 @@ runs:
     - name: Install Homebrew packages
       shell: sh
       run: /opt/homebrew/bin/brew install openmpi
-    
+
     - name: Verify MetalToolchain installed
       shell: bash
       run: xcodebuild -showComponent MetalToolchain
 
-    - uses: conda-incubator/setup-miniconda@v3
-      with:
-        miniconda-version: "latest"
-        python-version: ${{ inputs.python-version }}
+    - uses: astral-sh/setup-uv@v7
+
+    - name: Setup Python venv
+      shell: cmd
+      run: |
+        echo "::group::Setup Python venv"
+        export PATH="$HOME/.local/bin:$PATH"
+        uv venv --python ${{ inputs.python-version }}
+        source .venv/bin/activate
+        echo PATH=$PATH >> $GITHUB_ENV
+        # Search python packages in .venv
+        echo PYTHONPATH=`python -c 'import sys; print(sys.path[-1])'` >> $GITHUB_ENV
+        echo "::endgroup::"