Build windows pip wheels

.github/workflows/wheels.yml

@@ -3,6 +3,9 @@ name: Build wheels
 on:
   workflow_dispatch: {}
 
+# this yaml file can be cleaned up using yaml anchors, but they're not supported in github actions yet
+# https://github.com/actions/runner/issues/1182
+
 env:
   # all values:
   # 3.5;3.7;5.0;5.2;5.3;6.0;6.1;6.2;7.0;7.2;7.5;8.0;8.6
@@ -11,43 +14,94 @@ env:
   # you need at least cuda 5.0 for some of the stuff compiled here.
   TORCH_CUDA_ARCH_LIST: "6.0 6.1 7.0 7.5 8.0 8.6"
   FORCE_CUDA: 1
+  MAX_JOBS: 1 # will crash otherwise
+  DISTUTILS_USE_SDK: 1 # otherwise distutils will complain on windows about multiple versions of msvc
 
 jobs:
   build_wheels:
     strategy:
+      fail-fast: false # don't stop other jobs if one failed
       matrix:
+        os:
+          - ubuntu-22.04
+          - windows-2019
         python:
-          - "python3.7"
-          - "python3.8"
-          - "python3.9"
-          - "python3.10"
+          - "3.7"
+          - "3.8"
+          - "3.9"
+          - "3.10"
         config:
           # torch 1.13 is built with cuda 11.6 and 11.7
           - torch_version: "1.13.0+cu117"
+            cuda_version: "11.7.0"
             pip_index: https://download.pytorch.org/whl/cu117
             cuda_run_file: https://developer.download.nvidia.com/compute/cuda/11.7.1/local_installers/cuda_11.7.1_515.65.01_linux.run
 
           - torch_version: "1.13.0+cu116"
+            cuda_version: "11.6.2"
             pip_index: https://download.pytorch.org/whl/cu116
             cuda_run_file: https://developer.download.nvidia.com/compute/cuda/11.6.2/local_installers/cuda_11.6.2_510.47.03_linux.run
 
           # torch 1.12 is built with cuda 11.3 and 11.6, we ignore 11.3 for now
           - torch_version: "1.12.1+cu116"
+            cuda_version: "11.6.2"
             pip_index: https://download.pytorch.org/whl/cu116
             cuda_run_file: https://developer.download.nvidia.com/compute/cuda/11.6.2/local_installers/cuda_11.6.2_510.47.03_linux.run
 
-    name: ${{ matrix.python }}-torch${{ matrix.config.torch_version }}
-    runs-on: ubuntu-22.04
+    name: ${{ matrix.os }}-py${{ matrix.python }}-torch${{ matrix.config.torch_version }}
+    runs-on: ${{ matrix.os }}
+    env:
+      # alias for the current python version
+      # windows does not have per version binary, it is just 'python3'
+      PY: python${{ contains(matrix.os, 'ubuntu') && matrix.python || '3' }}
+
+    container: ${{ contains(matrix.os, 'ubuntu') && 'quay.io/pypa/manylinux2014_x86_64' || null }}
     timeout-minutes: 360
-    container:
-      image: quay.io/pypa/manylinux2014_x86_64
+    defaults:
+      run:
+        shell: bash
     steps:
-      - name: install cuda
+      ##### linux build setup
+      - if: runner.os == 'Linux'
+        name: (Linux) install cuda
         run: >
           yum install wget git prename -y &&
           wget -q "${{ matrix.config.cuda_run_file }}" -O cuda.run &&
           sh ./cuda.run --silent --toolkit
+      #### end linux build setup
+      ### windows build setup
+      - if: runner.os == 'Windows'
+        name: (Windows) install cuda
+        uses: okazunori2013/cuda-toolkit@v0.3.2
+        with:
+          cuda: ${{ matrix.config.cuda_version }}
+          method: network
+
+      - if: runner.os == 'Windows'
+        name: (Windows) install python
+        uses: actions/setup-python@v4
+        with:
+          python-version: "${{ matrix.python }}"
+
+      - if: runner.os == 'Windows'
+        name: (Windows) setup msvc
+        uses: ilammy/msvc-dev-cmd@v1
+
+      - if: runner.os == 'Windows'
+        name: configure Pagefile
+        # windows runners will OOM with many CUDA architectures
+        # we cheat here with a page file
+        uses: al-cheb/configure-pagefile-action@v1.2
+        with:
+          minimum-size: 8GB
+
+      - if: runner.os == 'Windows'
+        name: (Windows) Remove link.exe
+        # really unfortunate: https://github.com/ilammy/msvc-dev-cmd#name-conflicts-with-shell-bash
+        run: rm /usr/bin/link
+      #### end windows build setup
 
+      #### now the actual build:
       - name: Recursive checkout
         uses: actions/checkout@v3
         with:
@@ -56,13 +110,14 @@ jobs:
 
       - name: Install build dependencies
         run: >
-          ${{ matrix.python }} -m pip install setuptools torch==${{ matrix.config.torch_version }} -r requirements.txt --extra-index-url ${{ matrix.config.pip_index }} &&
+          $PY -m pip install wheel setuptools torch==${{ matrix.config.torch_version }} -r requirements.txt --extra-index-url ${{ matrix.config.pip_index }} &&
           git config --global --add safe.directory "*"
 
       - name: Build wheel
-        run: ${{ matrix.python }} setup.py bdist_wheel -d "dist/${{ matrix.python }}-torch${{ matrix.config.torch_version }}"
+        run: $PY setup.py bdist_wheel -d "dist/torch${{ matrix.config.torch_version }}"
 
       - uses: actions/upload-artifact@v3
         with:
+          name: ${{ matrix.os }}
           path: dist
 # Note: it might be helpful to have additional steps that test if the built wheels actually work