Introduce pytest-splits

.github/CHANGELOG.md

@@ -41,6 +41,9 @@
 
 ### Breaking changes
 
+* Split Lightning-Qubit and Lightning-Kokkos CPU Python tests with `pytest-split`. Remove `SERIAL` from Kokkos' `exec_model` matrix. Remove `all` from Lightning-Kokkos' `pl_backend` matrix. Move `clang-tidy` checks to `tidy.yml`. Avoid editable `pip` installations.
+  [(#696)](https://github.com/PennyLaneAI/pennylane-lightning/pull/696)
+
 * Update `lightning.gpu` and `lightning.kokkos` to raise an error instead of falling back to `default.qubit`.
   [(#689)](https://github.com/PennyLaneAI/pennylane-lightning/pull/689)
 

.github/workflows/build_and_cache_Kokkos_linux.yml

@@ -25,7 +25,7 @@ jobs:
     steps:
       - name: Kokkos execution strategy
         id: exec_model
-        run: echo "exec_model=[\"SERIAL\", \"OPENMP\"]" >> $GITHUB_OUTPUT
+        run: echo "exec_model=[\"OPENMP\"]" >> $GITHUB_OUTPUT
 
       - name: Kokkos version
         id: kokkos_version

.github/workflows/compat-check-latest-latest.yml

@@ -20,9 +20,16 @@ jobs:
       lightning-version: latest
       pennylane-version: latest
     secrets: inherit
-  tests_linux_python:
-    name: Lightning Compatibility test (tests_linux_python) - latest/latest
-    uses: ./.github/workflows/tests_linux_python.yml
+  tests_lqcpu_python:
+    name: Lightning Compatibility test (tests_lqcpu_python) - latest/latest
+    uses: ./.github/workflows/tests_lqcpu_python.yml
+    with:
+      lightning-version: latest
+      pennylane-version: latest
+    secrets: inherit
+  tests_lkcpu_python:
+    name: Lightning Compatibility test (tests_lkcpu_python) - latest/latest
+    uses: ./.github/workflows/tests_lkcpu_python.yml
     with:
       lightning-version: latest
       pennylane-version: latest

.github/workflows/compat-check-latest-stable.yml

@@ -20,9 +20,16 @@ jobs:
       lightning-version: latest
       pennylane-version: stable
     secrets: inherit
-  tests_linux_python:
-    name: Lightning Compatibility test (tests_linux_python) - latest/stable
-    uses: ./.github/workflows/tests_linux_python.yml
+  tests_lqcpu_python:
+    name: Lightning Compatibility test (tests_lqcpu_python) - latest/stable
+    uses: ./.github/workflows/tests_lqcpu_python.yml
+    with:
+      lightning-version: latest
+      pennylane-version: stable
+    secrets: inherit
+  tests_lkcpu_python:
+    name: Lightning Compatibility test (tests_lkcpu_python) - latest/stable
+    uses: ./.github/workflows/tests_lkcpu_python.yml
     with:
       lightning-version: latest
       pennylane-version: stable

.github/workflows/compat-check-release-release.yml

@@ -20,9 +20,16 @@ jobs:
       lightning-version: release
       pennylane-version: release
     secrets: inherit
-  tests_linux_python:
-    name: Lightning Compatibility test (tests_linux_python) - release/release
-    uses: ./.github/workflows/tests_linux_python.yml
+  tests_lqcpu_python:
+    name: Lightning Compatibility test (tests_lqcpu_python) - release/release
+    uses: ./.github/workflows/tests_lqcpu_python.yml
+    with:
+      lightning-version: release
+      pennylane-version: release
+    secrets: inherit
+  tests_lkcpu_python:
+    name: Lightning Compatibility test (tests_lkcpu_python) - release/release
+    uses: ./.github/workflows/tests_lkcpu_python.yml
     with:
       lightning-version: release
       pennylane-version: release

.github/workflows/compat-check-stable-latest.yml

@@ -20,9 +20,16 @@ jobs:
       lightning-version: stable
       pennylane-version: latest
     secrets: inherit
-  tests_linux_python:
-    name: Lightning Compatibility test (tests_linux_python) - stable/latest
-    uses: ./.github/workflows/tests_linux_python.yml
+  tests_lqcpu_python:
+    name: Lightning Compatibility test (tests_lqcpu_python) - stable/latest
+    uses: ./.github/workflows/tests_lqcpu_python.yml
+    with:
+      lightning-version: stable
+      pennylane-version: latest
+    secrets: inherit
+  tests_lkcpu_python:
+    name: Lightning Compatibility test (tests_lkcpu_python) - stable/latest
+    uses: ./.github/workflows/tests_lkcpu_python.yml
     with:
       lightning-version: stable
       pennylane-version: latest

.github/workflows/compat-check-stable-stable.yml

@@ -20,9 +20,16 @@ jobs:
       lightning-version: stable
       pennylane-version: stable
     secrets: inherit
-  tests_linux_python:
-    name: Lightning Compatibility test (tests_linux_python) - stable/stable
-    uses: ./.github/workflows/tests_linux_python.yml
+  tests_lqcpu_python:
+    name: Lightning Compatibility test (tests_lqcpu_python) - stable/stable
+    uses: ./.github/workflows/tests_lqcpu_python.yml
+    with:
+      lightning-version: stable
+      pennylane-version: stable
+    secrets: inherit
+  tests_lkcpu_python:
+    name: Lightning Compatibility test (tests_lkcpu_python) - stable/stable
+    uses: ./.github/workflows/tests_lkcpu_python.yml
     with:
       lightning-version: stable
       pennylane-version: stable

.github/workflows/format.yml

@@ -10,7 +10,7 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
-  black:
+  format-python:
     name: Format (Python)
     runs-on: ubuntu-22.04
     steps:
@@ -42,38 +42,3 @@ jobs:
 
       - name: Run formatter
         run: PATH=$PATH:/home/ubuntu/.local/bin/:$(dirname $(which python3))/ ./bin/format --check ./pennylane_lightning/core/src
-
-  tidy-cpp:
-    strategy:
-      matrix:
-        os: [ubuntu-22.04]
-        pl_backend: ["lightning_qubit"]
-
-    name: Tidy (C++)
-    runs-on: ${{ matrix.os }}
-
-    steps:
-      - name: Checkout PennyLane-Lightning
-        uses: actions/checkout@v4
-
-      - name: Set up Python
-        uses: actions/setup-python@v5
-        with:
-          python-version: '3.11'
-
-      - name: Install dependencies
-        run: sudo apt update && sudo apt -y install cmake gcc-11 g++-11 ninja-build libomp-14-dev && python -m pip install -r requirements-dev.txt
-        env:
-          DEBIAN_FRONTEND: noninteractive
-
-      - name: Run clang-tidy compilation
-        run: |
-          cmake -BBuild -G Ninja . \
-            -DENABLE_CLANG_TIDY=ON \
-            -DCLANG_TIDY_BINARY=$(dirname $(which python))/clang-tidy \
-            -DBUILD_TESTS=ON \
-            -DENABLE_WARNINGS=ON \
-            -DPL_BACKEND=${{ matrix.pl_backend }} \
-            -DCMAKE_CXX_COMPILER="$(which g++-11)" \
-            -DCMAKE_C_COMPILER="$(which gcc-11)"
-          cmake --build ./Build