name: Build wheels and upload to GitHub Releases

on:
  create:
    tags:
      - "v*"

jobs:
  create_releases:
    name: Create Releases
    runs-on: ubuntu-latest
    steps:
      - name: Get the tag version
        id: extract_branch
        run: echo ::set-output name=branch::${GITHUB_REF#refs/tags/}
        shell: bash
      - name: Create Release
        id: create_release
        uses: actions/create-release@v1
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          tag_name: ${{ steps.extract_branch.outputs.branch }}
          release_name: ${{ steps.extract_branch.outputs.branch }}
          body: |
            - Flash-Attention
              - 2.4.3
              - 2.5.6
              - 2.5.9
              - 2.6.3
            - Python
              - 3.10
              - 3.11
              - 3.12
            - PyTorch
              - 2.0.1
              - 2.1.2
              - 2.2.2
              - 2.3.1
              - 2.4.1
              - 2.5.0
            - CUDA
              - 11.8.0
              - 12.1.1
              - 12.4.1

  build_wheels:
    name: Build wheels and Upload
    needs: create_releases
    runs-on: ubuntu-latest
    strategy:
      fails-fast: false
      matrix:
        flash-attn-version: [2.4.3, 2.5.6, 2.5.9, 2.6.3]
        python-version: [3.10, 3.11, 3.12]
        torch-version: [2.0.1, 2.1.2, 2.2.2, 2.3.1, 2.4.1, 2.5.0]
        cuda-version: [11.8.0, 12.1.1, 12.4.1]
        exclude:
          # torch < 2.2 does not support Python 3.12
          - python-version: 3.12
            torch-version: 2.0.1
          - python-version: 3.12
            torch-version: 2.1.2
          # torch 2.0.1 does not support CUDA 12.x
          - torch-version: 2.0.1
            cuda-version: 12.1.1
          - torch-version: 2.0.1
            cuda-version: 12.4.1

      steps:
        - uses: actions/checkout@v4
        - name: Maximize build space
          run: |
            df -h
            echo "-----------------------------"
            sudo rm -rf /usr/share/dotnet
            sudo rm -rf /usr/local/lib/android
            sudo rm -rf /opt/ghc
            sudo rm -rf /opt/hostedtoolcache/CodeQL
            df -h
        - name: Set Swap Space
          uses: pierotofy/set-swap-space@master
          with:
            swap-size-gb: 10

        - uses: actions/setup-python@v5
          with:
            python-version: ${{ matrix.python-version }}
        - uses: Jimver/cuda-toolkit@master
          with:
            cuda: ${{ matrix.cuda-version }}
            linux-local-args: '["--toolkit"]'
            method: "network"
        - run: sudo apt install -y ninja-build

        - name: Set CUDA and PyTorch versions
          run: |
            echo "MATRIX_CUDA_VERSION=$(echo ${{ matrix.cuda }} | awk -F \. {'print $1 $2'})" >> $GITHUB_ENV
            echo "MATRIX_TORCH_VERSION=$(echo ${{ matrix.torch }} | awk -F \. {'print $1 "." $2'})" >> $GITHUB_ENV

        - name: Install PyTorch ${{ matrix.torch-version }}+cu${{ matrix.cuda-version }}
          run: |
            pip install -U pip
            pip install wheel setuptools packaging
            export TORCH_CUDA_VERSION=$(python -c "from os import environ as env; \
                support_cuda_versions = { \
                    '2.0': [117, 118], \
                    '2.1': [118, 121], \
                    '2.2': [118, 121], \
                    '2.3': [118, 121], \
                    '2.4': [118, 121, 124], \
                    '2.5': [118, 121, 124], \
                }; \
                target_cuda_versions = support_cuda_versions[env['MATRIX_TORCH_VERSION']]; \
                cuda_version = int(env['MATRIX_CUDA_VERSION']); \
                closest_version = min(target_cuda_versions, key=lambda x: abs(x - cuda_version)); \
                print(closest_version) \
            ")
            pip install --no-cache-dir torch==${{ matrix.torch }} --index-url https://download.pytorch.org/whl/cu${TORCH_CUDA_VERSION}
            nvcc --version
            python -V
            python -c import torch; print("'PyTorch:', torch.__version__)"
            python -c "import torch; print('CUDA:', torch.version.cuda)"
            python -c "from torch.utils import cpp_extension; print(cpp_extension.CUDA_HOME)")

        - name: Checkout flash-attn
          run: |
            git clone https://github.com/Dao-AILab/flash-attention.git
            cd flash-attention
            git checkout v${{ matrix.flash-attn-version }}

        - name: Build wheels
          run: |
            pip install setuptools==68.0.0 ninja packaging wheel
            export PATH=/usr/local/nvidia/bin:/usr/local/nvidia/lib64:$PATH
            export LD_LIBRARY_PATH=/usr/local/nvidia/lib64:/usr/local/cuda/lib64:$LD_LIBRARY_PATH
            export MAX_JOBS=1
            FLASH_ATTENTION_FORCE_BUILD="TRUE" python setup.py bdist_wheel --dist-dir=dist
            wheel_name=$(basename $(ls dist/*.whl | head -n 1))
            echo "wheel_name=$wheel_name" >> $GITHUB_ENV

        - name: Install Test
          run: |
            pip install flash_attention/dist/${{ env.wheel_name }}
            python -c "import flash_atten; print(flash_atten.__version__)"

        - name: Get the tag version
          id: extract_branch
          run: echo ::set-output name=branch::${GITHUB_REF#refs/tags/}

        - name: Get Release with Tag
          id: get_release
          uses: joutvhu/get-release@v1
          env:
            GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          with:
            tag_name: ${{ steps.extract_branch.outputs.branch }}

        - name: Upload Release Asset
          uses: actions/upload-release-asset@v1
          env:
            GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          with:
            upload_url: ${{ steps.get_release.outputs.upload_url }}
            asset_path: flash-attention/dist/${{ env.wheel_name }}
            asset_name: ${{ env.wheel_name }}
            asset_content_type: application/*