[skip ci] build pytorch 1.9.0

Author: rusty1s

.github/workflows/building.yml

@@ -44,7 +44,7 @@ jobs:
 
       - name: Install PyTorch ${{ matrix.torch-version }}+${{ matrix.cuda-version }}
         run: |
-          pip install numpy typing-extensions
+          pip install numpy typing-extensions dataclasses
           pip install --no-index --no-cache-dir torch==${{ matrix.torch-version}} -f https://download.pytorch.org/whl/${{ matrix.cuda-version }}/torch_stable.html
           python -c "import torch; print('PyTorch:', torch.__version__)"
           python -c "import torch; print('CUDA:', torch.version.cuda)"