clear ~/.cache/torch_extensions between builds (#14520)

.github/workflows/self-nightly-scheduled.yml

@@ -205,8 +205,9 @@ jobs:
                   apt -y update && apt install -y libaio-dev
                   pip install --upgrade pip
                   pip install --pre torch torchvision torchaudio -f https://download.pytorch.org/whl/nightly/cu111/torch_nightly.html -U
-                  pip install .[testing,deepspeed,fairscale]
-                  pip install git+https://github.com/microsoft/DeepSpeed
+                  rm -rf ~/.cache/torch_extensions/ # shared between conflicting builds
+                  pip install .[testing,fairscale]
+                  pip install git+https://github.com/microsoft/DeepSpeed # testing bleeding edge
 
             - name: Are GPUs recognized by our DL frameworks
               run: |

.github/workflows/self-push.yml

@@ -437,6 +437,7 @@ jobs:
         run: |
           apt -y update && apt install -y libaio-dev
           pip install --upgrade pip
+          rm -rf ~/.cache/torch_extensions/ # shared between conflicting builds
           pip install .[testing,deepspeed,fairscale]
 
       - name: Are GPUs recognized by our DL frameworks

.github/workflows/self-scheduled.yml

@@ -429,6 +429,7 @@ jobs:
         run: |
           apt -y update && apt install -y libaio-dev
           pip install --upgrade pip
+          rm -rf ~/.cache/torch_extensions/ # shared between conflicting builds
           pip install .[testing,deepspeed,fairscale]
 
       - name: Are GPUs recognized by our DL frameworks