Use uv to install Python packages

.github/workflows/asan.yaml

@@ -62,7 +62,8 @@ jobs:
         run: |
           source ${GITHUB_WORKSPACE}/venv/bin/activate
           cd jax
-          pip install -r build/test-requirements.txt
+          pip install uv~=0.5.30
+          uv pip install -r build/test-requirements.txt
       - name: Build and install JAX
         env:
           ASAN_OPTIONS: detect_leaks=0
@@ -73,8 +74,8 @@ jobs:
             --bazel_options=--color=yes \
             --bazel_options=--copt=-fsanitize=address \
             --clang_path=/usr/bin/clang-18
-          pip install dist/jaxlib-*.whl
-          pip install -e .
+          uv pip install dist/jaxlib-*.whl \
+            -e .
       - name: Run tests
         env:
           ASAN_OPTIONS: detect_leaks=0

.github/workflows/ci-build.yaml

@@ -75,7 +75,7 @@ jobs:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
       run: |
-        pip install uv
+        pip install uv~=0.5.30
         uv pip install --system .[minimum-jaxlib] -r build/test-requirements.txt
 
     - name: Run tests
@@ -113,7 +113,7 @@ jobs:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
       run: |
-        pip install uv
+        pip install uv~=0.5.30
         uv pip install --system -r docs/requirements.txt
     - name: Test documentation
       env:
@@ -147,7 +147,7 @@ jobs:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
       run: |
-        pip install uv
+        pip install uv~=0.5.30
         uv pip install --system -r docs/requirements.txt
     - name: Render documentation
       run: |
@@ -173,7 +173,7 @@ jobs:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
       run: |
-        pip install uv
+        pip install uv~=0.5.30
         uv pip install --system .[minimum-jaxlib] tensorflow -r build/test-requirements.txt
 
     - name: Run tests
@@ -205,7 +205,7 @@ jobs:
         python-version: 3.12
     - name: Install JAX
       run: |
-        pip install uv
+        pip install uv~=0.5.30
         uv pip install --system .[cuda12]
     - name: Build and install example project
       run: uv pip install --system ./examples/ffi[test]

.github/workflows/cloud-tpu-ci-nightly.yml

@@ -59,42 +59,38 @@ jobs:
           git config --global --add safe.directory "$GITHUB_WORKSPACE"
       - name: Install JAX test requirements
         run: |
-          $PYTHON -m pip install -U -r build/test-requirements.txt
-          $PYTHON -m pip install -U -r build/collect-profile-requirements.txt
+          $PYTHON -m uv pip install -U -r build/test-requirements.txt -r build/collect-profile-requirements.txt
       - name: Install JAX
         run: |
-          $PYTHON -m pip uninstall -y jax jaxlib libtpu
+          $PYTHON -m uv pip uninstall -y jax jaxlib libtpu
           if [ "${{ matrix.jaxlib-version }}" == "head" ]; then
             # Build and install jaxlib at head
             $PYTHON build/build.py build --wheels=jaxlib \
                     --bazel_options=--config=rbe_linux_x86_64 \
                     --local_xla_path="$(pwd)/xla" \
                     --verbose
 
-            $PYTHON -m pip install dist/*.whl
-
-            # Install "jax" at head
-            $PYTHON  -m pip install -U -e .
-
-            # Install libtpu
-            $PYTHON -m pip install --pre libtpu \
-              -f https://storage.googleapis.com/jax-releases/libtpu_releases.html
+            # Install jaxlib, "jax" at head, and libtpu
+            $PYTHON -m uv pip install dist/*.whl \
+               -U -e . \
+               --pre libtpu -f https://storage.googleapis.com/jax-releases/libtpu_releases.html
           elif [ "${{ matrix.jaxlib-version }}" == "pypi_latest" ]; then
-            $PYTHON -m pip install .[tpu] \
+            $PYTHON -m uv pip install .[tpu] \
               -f https://storage.googleapis.com/jax-releases/libtpu_releases.html
 
           elif [ "${{ matrix.jaxlib-version }}" == "nightly" ]; then
-            $PYTHON -m pip install --pre . -f https://storage.googleapis.com/jax-releases/jax_nightly_releases.html
-            $PYTHON -m pip install --pre libtpu \
-              -f https://storage.googleapis.com/jax-releases/libtpu_releases.html
-            $PYTHON -m pip install requests
+            $PYTHON -m uv pip install \
+              --pre . -f https://storage.googleapis.com/jax-releases/jax_nightly_releases.html \
+              --pre libtpu -f https://storage.googleapis.com/jax-releases/libtpu_releases.html \
+              install requests
 
           elif [ "${{ matrix.jaxlib-version }}" == "nightly+oldest_supported_libtpu" ]; then
-            $PYTHON -m pip install --pre . -f https://storage.googleapis.com/jax-releases/jax_nightly_releases.html
             # TODO(phawkins): switch to libtpu, when the oldest release we support is a libtpu release.
-            $PYTHON -m pip install --pre libtpu-nightly==0.1.dev${{ env.LIBTPU_OLDEST_VERSION_DATE }} \
-              -f https://storage.googleapis.com/jax-releases/libtpu_releases.html
-            $PYTHON -m pip install requests
+            $PYTHON -m uv pip install \
+              --pre . -f https://storage.googleapis.com/jax-releases/jax_nightly_releases.html \
+              --pre libtpu-nightly==0.1.dev${{ env.LIBTPU_OLDEST_VERSION_DATE }} \
+              -f https://storage.googleapis.com/jax-releases/libtpu_releases.html \
+              install requests
           else
             echo "Unknown jaxlib-version: ${{ matrix.jaxlib-version }}"
             exit 1

.github/workflows/cloud-tpu-ci-presubmit.yml

@@ -74,8 +74,7 @@ jobs:
           git config --global --add safe.directory "$GITHUB_WORKSPACE"
       - name: Install JAX test requirements
         run: |
-          $JAXCI_PYTHON -m pip install -U -r build/test-requirements.txt
-          $JAXCI_PYTHON -m pip install -U -r build/collect-profile-requirements.txt
+          $JAXCI_PYTHON -m uv pip install -U -r build/test-requirements.txt -r build/collect-profile-requirements.txt
       - name: Build jaxlib at head with latest XLA
         run: |
           # Build and install jaxlib at head
@@ -86,7 +85,7 @@ jobs:
                   --verbose
 
           # Install libtpu
-          $JAXCI_PYTHON -m pip install --pre libtpu \
+          $JAXCI_PYTHON -m uv pip install --pre libtpu \
             -f https://storage.googleapis.com/jax-releases/libtpu_releases.html
       # Halt for testing
       - name: Wait For Connection

.github/workflows/jax-array-api.yml

@@ -37,9 +37,8 @@ jobs:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
       run: |
-        pip install uv
-        uv pip install --system .[ci]
-        uv pip install --system pytest-xdist -r array-api-tests/requirements.txt
+        pip install uv~=0.5.30
+        uv pip install --system .[ci] --system pytest-xdist -r array-api-tests/requirements.txt
     - name: Run the test suite
       env:
         ARRAY_API_TESTS_MODULE: jax.numpy

.github/workflows/metal_plugin_ci.yml

@@ -35,15 +35,14 @@ jobs:
           rm -rf ${GITHUB_WORKSPACE}/jax-metal-venv
           python3 -m venv ${GITHUB_WORKSPACE}/jax-metal-venv
           source  ${GITHUB_WORKSPACE}/jax-metal-venv/bin/activate
-          pip install -U pip numpy wheel
-          pip install absl-py pytest
+          pip install uv~=0.5.30
+          uv pip install -U pip numpy wheel absl-py pytest
           if [[ "${{ matrix.jaxlib-version }}" == "nightly" ]]; then
-            pip install --pre jaxlib \
+            uv pip install --pre jaxlib \
               -f https://storage.googleapis.com/jax-releases/jax_nightly_releases.html
           fi;
           cd jax
-          pip install .
-          pip install jax-metal
+          uv pip install . jax-metal
       - name: Run test
         run: |
           source  ${GITHUB_WORKSPACE}/jax-metal-venv/bin/activate

.github/workflows/pytest_cpu.yml

@@ -123,7 +123,7 @@ jobs:
           echo "Skipping the test run."
           exit 1
       - name: Install Python dependencies
-        run: $JAXCI_PYTHON -m pip install -r build/requirements.in
+        run: $JAXCI_PYTHON -m uv pip install -r build/requirements.in
       # Halt for testing
       - name: Wait For Connection
         uses: google-ml-infra/actions/ci_connection@main

.github/workflows/pytest_cuda.yml

@@ -106,7 +106,7 @@ jobs:
           echo "Skipping the test run."
           exit 1
       - name: Install Python dependencies
-        run: $JAXCI_PYTHON -m pip install -r build/requirements.in
+        run: $JAXCI_PYTHON -m uv pip install -r build/requirements.in
       # Halt for testing
       - name: Wait For Connection
         uses: google-ml-infra/actions/ci_connection@main

.github/workflows/tsan.yaml

@@ -111,9 +111,9 @@ jobs:
 
           export PATH=${GITHUB_WORKSPACE}/cpython-tsan/bin/:$PATH
 
-          python3 -m pip install -r requirements/build_requirements.txt
+          python3 -m pip install uv~=0.5.30
           # Make sure to install a compatible Cython version (master branch is best for now)
-          python3 -m pip install -U git+https://github.com/cython/cython
+          python3 -m uv pip install -r requirements/build_requirements.txt -U git+https://github.com/cython/cython
 
           CC=clang-18 CXX=clang++-18 python3 -m pip wheel --wheel-dir dist -v . --no-build-isolation -Csetup-args=-Db_sanitize=thread -Csetup-args=-Dbuildtype=debugoptimized
 

.github/workflows/upstream-nightly.yml

@@ -38,10 +38,11 @@ jobs:
           python-version: ${{ matrix.python-version }}
       - name: Install JAX test requirements
         run: |
-          pip install .[ci] -r build/test-requirements.txt
+          pip install uv~=0.5.30
+          uv pip install .[ci] -r build/test-requirements.txt
       - name: Install numpy & scipy development versions
         run: |
-          pip install \
+          uv pip install \
             -i https://pypi.anaconda.org/scientific-python-nightly-wheels/simple \
             --no-deps \
             --pre \

.github/workflows/wheel_win_x64.yml

@@ -37,8 +37,9 @@ jobs:
           BAZEL_VC: "C:\\Program Files (x86)\\Microsoft Visual Studio\\2019\\Enterprise\\VC"
           JAXLIB_RELEASE: true
         run: |
-          python -m pip install -r build/test-requirements.txt
-          python -m pip install --upgrade numpy==2.0.0 scipy==1.13.1
+          python -m pip install uv~=0.5.30
+          python -m uv pip install -r build/test-requirements.txt \
+            --upgrade numpy==2.0.0 scipy==1.13.1
           "C:\\msys64\\;C:\\msys64\\usr\\bin\\;" >> $env:GITHUB_PATH
           python.exe build\build.py build --wheels=jaxlib `
             --bazel_options=--color=yes `
@@ -57,7 +58,7 @@ jobs:
           JAX_SKIP_SLOW_TESTS: true
           PY_COLORS: 1
         run: |
-          python -m pip install --find-links ${{ github.workspace }}\dist jaxlib
-          python -m pip install -e ${{ github.workspace }}
+          python -m uv pip install --find-links ${{ github.workspace }}\dist jaxlib \
+            -e ${{ github.workspace }}
           echo "JAX_ENABLE_CHECKS=$JAX_ENABLE_CHECKS"
           pytest -n auto --tb=short tests examples

.github/workflows/windows_ci.yml

@@ -46,8 +46,8 @@ jobs:
           JAXLIB_NIGHTLY: true  # Tag the wheels as dev versions
         run: |
           cd jax
-          python -m pip install -r build/test-requirements.txt
-          python -m pip install --upgrade numpy==2.0.0 scipy==1.13.1
+          python -m pip install uv~=0.5.30
+          python -m uv pip install -r build/test-requirements.txt --upgrade numpy==2.0.0 scipy==1.13.1
           "C:\\msys64\\;C:\\msys64\\usr\\bin\\;" >> $env:GITHUB_PATH
           python.exe build\build.py build --wheels=jaxlib `
             --bazel_options=--color=yes `
@@ -67,7 +67,7 @@ jobs:
           PY_COLORS: 1
         run: |
           cd jax
-          python -m pip install --pre --find-links ${{ github.workspace }}\jax\dist jaxlib
-          python -m pip install -e ${{ github.workspace }}\jax
+          python -m uv pip install --pre --find-links ${{ github.workspace }}\jax\dist jaxlib \
+            -e ${{ github.workspace }}\jax
           echo "JAX_ENABLE_CHECKS=$JAX_ENABLE_CHECKS"
           pytest -n auto --tb=short tests examples

ci/utilities/install_wheels_locally.sh

@@ -27,15 +27,21 @@ fi
 echo "Installing the following wheels:"
 echo "${WHEELS[@]}"
 
+# Install `uv` if it's not already installed. `uv` is much faster than pip for
+# installing Python packages.
+if ! command -v uv >/dev/null 2>&1; then
+  pip install uv~=0.5.30
+fi
+
 # On Windows, convert MSYS Linux-like paths to Windows paths.
 if [[ $(uname -s) =~ "MSYS_NT" ]]; then
-  "$JAXCI_PYTHON" -m pip install $(cygpath -w "${WHEELS[@]}")
+  "$JAXCI_PYTHON" -m uv pip install $(cygpath -w "${WHEELS[@]}")
 else
-  "$JAXCI_PYTHON" -m pip install "${WHEELS[@]}"
+  "$JAXCI_PYTHON" -m uv pip install "${WHEELS[@]}"
 fi
 
 if [[ "$JAXCI_INSTALL_JAX_CURRENT_COMMIT" == "1" ]]; then
   echo "Installing the JAX package in editable mode at the current commit..."
   # Install JAX package at the current commit.
-  "$JAXCI_PYTHON" -m pip install -U -e .
+  "$JAXCI_PYTHON" -m uv pip install -U -e .
 fi