name: Test PyTorch

# see: https://help.github.com/en/actions/reference/events-that-trigger-workflows
on:
  push:
    branches: [master, "release/*"]
  pull_request:
    branches: [master, "release/*"]
    types: [opened, reopened, ready_for_review, synchronize] # added `ready_for_review` since draft is skipped
    paths:
      - ".actions/*"
      - "requirements/ci.txt"
      - "requirements/pytorch/**"
      - "src/lightning/pytorch/**"
      - "src/pytorch_lightning/*"
      - "tests/tests_pytorch/**"
      - "tests/legacy/**"
      - "pyproject.toml" # includes pytest config
      - ".github/workflows/ci-tests-pytorch.yml"
      - "requirements/fabric/**"
      - "src/lightning/fabric/**"
      - "src/lightning_fabric/*"
      - "!requirements/pytorch/docs.txt"
      - "!*.md"
      - "!**/*.md"
  schedule:
    # At the end of every day
    - cron: "0 0 * * *"

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.head_ref }}
  cancel-in-progress: ${{ github.event_name == 'pull_request' }}

defaults:
  run:
    shell: bash

jobs:
  pl-cpu:
    runs-on: ${{ matrix.os }}
    if: github.event.pull_request.draft == false
    strategy:
      fail-fast: false
      matrix:
        include:
          # only run PyTorch latest
          - { os: "macOS-14", pkg-name: "lightning", python-version: "3.10", pytorch-version: "2.1" }
          - { os: "ubuntu-20.04", pkg-name: "lightning", python-version: "3.10", pytorch-version: "2.1" }
          - { os: "windows-2022", pkg-name: "lightning", python-version: "3.10", pytorch-version: "2.1" }
          - { os: "macOS-14", pkg-name: "lightning", python-version: "3.11", pytorch-version: "2.2" }
          - { os: "ubuntu-20.04", pkg-name: "lightning", python-version: "3.11", pytorch-version: "2.2" }
          - { os: "windows-2022", pkg-name: "lightning", python-version: "3.11", pytorch-version: "2.2" }
          - { os: "macOS-14", pkg-name: "lightning", python-version: "3.11", pytorch-version: "2.3" }
          - { os: "ubuntu-20.04", pkg-name: "lightning", python-version: "3.11", pytorch-version: "2.3" }
          - { os: "windows-2022", pkg-name: "lightning", python-version: "3.11", pytorch-version: "2.3" }
          - { os: "macOS-14", pkg-name: "lightning", python-version: "3.12", pytorch-version: "2.4" }
          - { os: "ubuntu-20.04", pkg-name: "lightning", python-version: "3.12", pytorch-version: "2.4" }
          - { os: "windows-2022", pkg-name: "lightning", python-version: "3.12", pytorch-version: "2.4" }
          # only run PyTorch latest with Python latest, use PyTorch scope to limit dependency issues
          - { os: "macOS-12", pkg-name: "pytorch", python-version: "3.10", pytorch-version: "2.1" }
          - { os: "ubuntu-22.04", pkg-name: "pytorch", python-version: "3.10", pytorch-version: "2.1" }
          - { os: "windows-2022", pkg-name: "pytorch", python-version: "3.10", pytorch-version: "2.1" }
          # "oldest" versions tests, only on minimum Python
          - { os: "macOS-13", pkg-name: "lightning", python-version: "3.9", pytorch-version: "2.1", requires: "oldest" }
          - {
              os: "ubuntu-20.04",
              pkg-name: "lightning",
              python-version: "3.9",
              pytorch-version: "2.1",
              requires: "oldest",
            }
          - {
              os: "windows-2022",
              pkg-name: "lightning",
              python-version: "3.9",
              pytorch-version: "2.1",
              requires: "oldest",
            }
          # "pytorch" installs the standalone package
          - { os: "macOS-14", pkg-name: "pytorch", python-version: "3.9", pytorch-version: "2.1" }
          - { os: "ubuntu-20.04", pkg-name: "pytorch", python-version: "3.9", pytorch-version: "2.1" }
          - { os: "windows-2022", pkg-name: "pytorch", python-version: "3.9", pytorch-version: "2.1" }
    timeout-minutes: 50
    env:
      PACKAGE_NAME: ${{ matrix.pkg-name }}
      TORCH_URL: "https://download.pytorch.org/whl/cpu/torch_stable.html"
      TORCH_URL_STABLE: "https://download.pytorch.org/whl/cpu/torch_stable.html"
      TORCH_URL_TEST: "https://download.pytorch.org/whl/test/cpu/torch"
      FREEZE_REQUIREMENTS: ${{ ! (github.ref == 'refs/heads/master' || startsWith(github.ref, 'refs/heads/release/')) }}
      PYPI_CACHE_DIR: "_pip-wheels"
      # TODO: Remove this - Enable running MPS tests on this platform
      DISABLE_MPS: ${{ matrix.os == 'macOS-14' && '1' || '0' }}
    steps:
      - uses: actions/checkout@v4

      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v5
        with:
          python-version: ${{ matrix.python-version }}

      - name: basic setup
        run: pip install -q -r .actions/requirements.txt

      - name: Set min. dependencies
        if: ${{ matrix.requires == 'oldest' }}
        run: python .actions/assistant.py replace_oldest_ver

      - name: Adjust PyTorch versions in requirements files
        if: ${{ matrix.requires != 'oldest' }}
        run: |
          pip install -q -r requirements/ci.txt
          python -m wget https://raw.githubusercontent.com/Lightning-AI/utilities/main/scripts/adjust-torch-versions.py
          for fpath in `ls requirements/**/*.txt`; do \
            python ./adjust-torch-versions.py $fpath ${{ matrix.pytorch-version }}; \
          done
          cat requirements/pytorch/base.txt

      - name: pip wheels cache
        uses: actions/cache/restore@v4
        with:
          path: ${{ env.PYPI_CACHE_DIR }}
          key: pypi_wheels
      - run: |
          mkdir -p $PYPI_CACHE_DIR
          ls -lh $PYPI_CACHE_DIR

      - name: Env. variables
        run: |
          # Switch PyTorch URL
          python -c "print('TORCH_URL=' + str('${{env.TORCH_URL_TEST}}' if '${{ matrix.pytorch-version }}' == '2.5' else '${{env.TORCH_URL_STABLE}}'))" >> $GITHUB_ENV
          # Switch coverage scope
          python -c "print('COVERAGE_SCOPE=' + str('lightning' if '${{matrix.pkg-name}}' == 'lightning' else 'pytorch_lightning'))" >> $GITHUB_ENV
          # if you install mono-package set dependency only for this subpackage
          python -c "print('EXTRA_PREFIX=' + str('' if '${{matrix.pkg-name}}' != 'lightning' else 'pytorch-'))" >> $GITHUB_ENV
          # Avoid issue on Windows with PyTorch 2.4: "RuntimeError: use_libuv was requested but PyTorch was build without libuv support"
          python -c "print('USE_LIBUV=0' if '${{matrix.os}}' == 'windows-2022' and '${{matrix.pytorch-version}}' == '2.4' else '')" >> $GITHUB_ENV

      - name: Install package & dependencies
        timeout-minutes: 20
        run: |
          pip install ".[${EXTRA_PREFIX}extra,${EXTRA_PREFIX}test,${EXTRA_PREFIX}strategies]" -U --prefer-binary \
            -r requirements/_integrations/accelerators.txt \
            --find-links="${TORCH_URL}" --find-links="${PYPI_CACHE_DIR}"
          pip list
      - name: Drop LAI from extensions
        if: ${{ matrix.pkg-name != 'lightning' }}
        # Lightning is dependency of Habana or other accelerators/integrations so in case we test PL we need to remove it
        run: pip uninstall -y lightning
      - name: Drop PL for LAI
        if: ${{ matrix.pkg-name == 'lightning' }}
        run: pip uninstall -y pytorch-lightning
      - name: Dump handy wheels
        if: github.event_name == 'push' && github.ref == 'refs/heads/master'
        continue-on-error: true
        uses: ./.github/actions/pip-wheels
        with:
          wheel-dir: ${{ env.PYPI_CACHE_DIR }}
          torch-url: ${{ env.TORCH_URL }}
          cache-key: "pypi_wheels"

      - name: Cache datasets
        uses: actions/cache@v4
        with:
          path: Datasets
          key: pl-dataset

      - name: Sanity check
        run: |
          set -e
          python requirements/pytorch/check-avail-extras.py
          python -c "from torch import __version__ as ver; assert ver.startswith('${{ matrix.pytorch-version }}'), ver"

      - name: Adjust tests / env. -> PL
        if: ${{ matrix.pkg-name != 'lightning' }}
        run: |
          python .actions/assistant.py copy_replace_imports --source_dir="./tests" \
            --source_import="lightning.fabric,lightning.pytorch" \
            --target_import="lightning_fabric,pytorch_lightning"

      - name: Prevent using raw source
        run: rm -rf src/

      - name: Get legacy checkpoints
        run: |
          bash .actions/pull_legacy_checkpoints.sh
          cd tests/legacy
          bash generate_checkpoints.sh
          ls -l checkpoints/

      - name: Testing Warnings
        working-directory: tests/tests_pytorch
        # needs to run outside `pytest`
        run: python utilities/test_warnings.py

      - name: Testing PyTorch
        working-directory: tests/tests_pytorch
        # NOTE: do not include coverage report here, see: https://github.com/nedbat/coveragepy/issues/1003
        run: |
          echo $GITHUB_RUN_ID
          python -m coverage run --source ${{ env.COVERAGE_SCOPE }} \
            -m pytest . -v --timeout=60 --durations=50 --random-order-seed=$GITHUB_RUN_ID

      - name: Statistics
        if: success()
        working-directory: tests/tests_pytorch
        run: |
          coverage report
          coverage xml

      - name: Upload coverage to Codecov
        uses: codecov/codecov-action@v4
        # see: https://github.com/actions/toolkit/issues/399
        continue-on-error: true
        with:
          token: ${{ secrets.CODECOV_TOKEN }}
          file: tests/tests_pytorch/coverage.xml
          flags: ${{ env.COVERAGE_SCOPE }},cpu,pytest-full,python${{ matrix.python-version }},pytorch${{ matrix.pytorch-version }}
          name: CPU-coverage
          fail_ci_if_error: false