Linux on arm

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

@@ -7,6 +7,13 @@ inputs:
     type: boolean
     required: false
     default: false
+  arch:
+    description: 'Platform architecture tag'
+    required: true
+    type: choice
+    options:
+      - x86_64
+      - aarch64
 
 runs:
   using: "composite"
@@ -23,11 +30,11 @@ runs:
         pip install auditwheel patchelf build
         python setup.py clean --all
         MLX_BUILD_STAGE=1 python -m build -w
-        bash python/scripts/repair_linux.sh
+        bash python/scripts/repair_linux.sh ${{ inputs.arch }}
     - name: Build backend package
       if: ${{ inputs.build-backend }}
       shell: bash
       run: |
         python setup.py clean --all
         MLX_BUILD_STAGE=2 python -m build -w
-        auditwheel repair dist/mlx_cpu*.whl --plat manylinux_2_35_x86_64
+        auditwheel repair dist/mlx_cpu*.whl --plat manylinux_2_35_${{ inputs.arch }}

.github/workflows/nightly.yml

@@ -21,6 +21,7 @@ jobs:
       - uses: ./.github/actions/build-linux-release
         with:
           build-backend: ${{ matrix.python-version == '3.10' }}
+          arch: "x86_64"
       - name: Upload mlx artifacts
         uses: actions/upload-artifact@v5
         with:
@@ -40,7 +41,10 @@ jobs:
       fail-fast: false
       matrix:
         python_version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
-    runs-on: ubuntu-22.04
+        runner:
+          - ubuntu-22.04
+          - ubuntu-22.04-arm
+    runs-on: ${{ matrix.runner }}
     steps:
       - uses: actions/checkout@v5
       - uses: ./.github/actions/setup-linux

.github/workflows/pull_request.yml

@@ -14,7 +14,13 @@ jobs:
       - uses: pre-commit/action@v3.0.1
 
   linux_build_and_test:
-    runs-on: ubuntu-22.04
+    strategy:
+      matrix:
+        runner:
+          - ubuntu-22.04
+          - ubuntu-22.04-arm
+      fail-fast: false
+    runs-on: ${{ matrix.runner }}
     steps:
       - uses: actions/checkout@v5
       - uses: ./.github/actions/setup-linux

.github/workflows/release.yml

@@ -45,7 +45,12 @@ jobs:
     strategy:
       matrix:
         python_version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
-    runs-on: ubuntu-22.04
+        include:
+          - runner: ubuntu-24.04
+            arch: x64
+          - runner: ubuntu-24.04-arm64
+            arch: arm64
+    runs-on: ${{ matrix.runner }}
     env:
       PYPI_RELEASE: 1
     steps:
@@ -56,6 +61,7 @@ jobs:
       - uses: ./.github/actions/build-linux-release
         with:
           build-backend: ${{ matrix.python-version == '3.10' }}
+          arch: ${{ matrix.arch }}
       - name: Upload MLX artifacts
         uses: actions/upload-artifact@v5
         with:

python/scripts/repair_linux.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 auditwheel repair dist/* \
-  --plat manylinux_2_35_x86_64 \
+  --plat manylinux_2_35_${1} \
   --only-plat \
   --exclude libmlx* \
   -w wheel_tmp

tests/linalg_tests.cpp

@@ -425,9 +425,11 @@ TEST_CASE("test matrix pseudo-inverse") {
     const auto A = array({1.0, 2.0, 3.0, 4.0}, {2, 2});
     const auto A_pinv = linalg::pinv(A, Device::cpu);
     const auto A_again = matmul(matmul(A, A_pinv), A);
-    CHECK(allclose(A_again, A).item<bool>());
+    CHECK(allclose(A_again, A, /* rtol = */ 1e-5, /* atol = */ 1e-5)
+              .item<bool>());
     const auto A_pinv_again = matmul(matmul(A_pinv, A), A_pinv);
-    CHECK(allclose(A_pinv_again, A_pinv).item<bool>());
+    CHECK(allclose(A_pinv_again, A_pinv, /* rtol = */ 1e-5, /* atol = */ 1e-5)
+              .item<bool>());
   }
   { // Rectangular matrix m < n
     const auto prng_key = random::key(42);
@@ -437,9 +439,11 @@ TEST_CASE("test matrix pseudo-inverse") {
     CHECK_FALSE(allclose(zeros, A_pinv, /* rtol = */ 0, /* atol = */ 1e-6)
                     .item<bool>());
     const auto A_again = matmul(matmul(A, A_pinv), A);
-    CHECK(allclose(A_again, A).item<bool>());
+    CHECK(allclose(A_again, A, /* rtol = */ 1e-5, /* atol = */ 1e-5)
+              .item<bool>());
     const auto A_pinv_again = matmul(matmul(A_pinv, A), A_pinv);
-    CHECK(allclose(A_pinv_again, A_pinv).item<bool>());
+    CHECK(allclose(A_pinv_again, A_pinv, /* rtol = */ 1e-5, /* atol = */ 1e-5)
+              .item<bool>());
   }
   { // Rectangular matrix m > n
     const auto prng_key = random::key(10);
@@ -449,9 +453,11 @@ TEST_CASE("test matrix pseudo-inverse") {
     CHECK_FALSE(allclose(zeros2, A_pinv, /* rtol = */ 0, /* atol = */ 1e-6)
                     .item<bool>());
     const auto A_again = matmul(matmul(A, A_pinv), A);
-    CHECK(allclose(A_again, A).item<bool>());
+    CHECK(allclose(A_again, A, /* rtol = */ 1e-5, /* atol = */ 1e-5)
+              .item<bool>());
     const auto A_pinv_again = matmul(matmul(A_pinv, A), A_pinv);
-    CHECK(allclose(A_pinv_again, A_pinv).item<bool>());
+    CHECK(allclose(A_pinv_again, A_pinv, /* rtol = */ 1e-5, /* atol = */ 1e-5)
+              .item<bool>());
   }
 }