Upgrade P40 tests to torch 1.8 (deepspeedai#2316)

Co-authored-by: Jeff Rasley <jerasley@microsoft.com>

Author: mrwyattii

.github/workflows/nv-torch12-p40.yml renamed to .github/workflows/nv-torch18-p40.yml

@@ -1,4 +1,4 @@
-name: nv-torch12-p40
+name: nv-torch18-p40
 
 on:
   push:
@@ -32,7 +32,7 @@ jobs:
           nvcc --version
           pip install --upgrade pip
           pip uninstall --yes torch torchvision
-          pip install torch==1.2.0 torchvision==0.4.0
+          pip install torch==1.8.2 torchvision==0.9.2 --extra-index-url https://download.pytorch.org/whl/lts/1.8/cu101
           python -c "import torch; print('torch:', torch.__version__, torch)"
           python -c "import torch; print('CUDA available:', torch.cuda.is_available())"
 
@@ -60,4 +60,4 @@ jobs:
         run: |
           if [[ -d ./torch-extensions ]]; then rm -rf ./torch-extensions; fi
           cd tests
-          TORCH_EXTENSIONS_DIR=./torch-extensions pytest --color=yes --durations=0 --forked --verbose -n 4 unit/ --torch_ver="1.2" --cuda_ver="10"
+          TORCH_EXTENSIONS_DIR=./torch-extensions pytest --color=yes --durations=0 --forked --verbose -n 4 unit/ --torch_ver="1.8" --cuda_ver="10"