Use the circleci to test the unit tests of CUDA (#1540)

* Use the official markdownlint hook

* upgrade the version of ruby

* use circleci to test the unit tests of CUDA

* fix conflict

* change the gpu resources from to small

.circleci/config.yml

+version: 2.1
+jobs:
+  lint:
+    docker:
+      - image: cimg/python:3.7.4
+    steps:
+      - checkout
+      - run:
+          name: Install dependencies
+          command: |
+            sudo apt-add-repository ppa:brightbox/ruby-ng -y
+            sudo apt-get update
+            sudo apt-get install -y ruby2.7
+      - run:
+          name: Install pre-commit hook
+          command: |
+            pip install pre-commit
+            pre-commit install
+      - run:
+          name: Linting
+          command: pre-commit run --all-files
+
+  build_cpu:
+    parameters:
+      # The python version must match available image tags in
+      # https://circleci.com/developer/images/image/cimg/python
+      python:
+        type: string
+        default: "3.7.0"
+      torch:
+        type: string
+      torchvision:
+        type: string
+    machine:
+      image: ubuntu-2004:202010-01
+    resource_class: large
+    steps:
+      - checkout
+      - run:
+          name: Install system dependencies
+          command: |
+            sudo apt-get update
+            sudo apt-get install -y ffmpeg libturbojpeg ninja-build
+            ffmpeg -version
+      - run:
+          # https://github.com/pytorch/vision/issues/2921
+          name: Install dependency of torchvision when using pyenv
+          command: sudo apt-get install -y liblzma-dev
+      - run:
+          # python3.7 should be re-installed due to the issue https://github.com/pytorch/vision/issues/2921
+          name: Select Python
+          command: |
+            pyenv uninstall -f << parameters.python >>
+            pyenv install << parameters.python >>
+            pyenv global << parameters.python >>
+      - run:
+          name: Upgrade pip
+          command: |
+            python -m pip install pip --upgrade
+      - run:
+          name: Install PyTorch
+          command: python -m pip install torch==<< parameters.torch >>+cpu torchvision==<< parameters.torchvision >>+cpu -f https://download.pytorch.org/whl/torch_stable.html
+      - run:
+          name: Install psutil
+          command: python -m pip install psutil
+      - run:
+          name: Build and install
+          command: |
+            rm -rf .eggs
+            python setup.py check -m -s
+            python -m pip install -e .
+          no_output_timeout: 20m
+          environment:
+            MMCV_WITH_OPS: 1
+      - run:
+          name: Install dependencies of unit test
+          command: |
+            python -m pip install -r requirements/test.txt
+      - run:
+          name: Run unittests and generate coverage report
+          command: |
+            python -m coverage run --branch --source mmcv -m pytest tests/
+            python -m coverage xml
+            python -m coverage report -m
+
+  build_cu102:
+    machine:
+      image: ubuntu-1604-cuda-10.1:201909-23  # the actual version of cuda is 10.2
+    resource_class: gpu.nvidia.small
+    steps:
+      - checkout
+      - run:
+          name: Set CUDA environment
+          command: |
+            echo 'export LD_LIBRARY_PATH=/usr/local/cuda/lib64:$LD_LIBRARY_PATH' >> $BASH_ENV
+            echo 'export PATH=/usr/local/cuda/bin:$PATH' >> $BASH_ENV
+            echo 'export CUDA_HOME=/usr/local/cuda' >> $BASH_ENV
+            source $BASH_ENV
+            nvidia-smi
+            nvcc --version
+            gcc --version
+      - run:
+          name: Install system dependencies
+          command: |
+            sudo apt-get update
+            sudo apt-get install -y libturbojpeg ninja-build
+            # the default version of ffmpeg is 2.8.7, which should be upgraded to 4+
+            sudo add-apt-repository -y ppa:jonathonf/ffmpeg-4
+            sudo apt-get update
+            sudo apt-get install -y ffmpeg
+            ffmpeg -version
+            sudo add-apt-repository --remove ppa:jonathonf/ffmpeg-4 -y
+      - run:
+          # https://github.com/pytorch/vision/issues/2921
+          name: Install dependency of torchvision when using pyenv
+          command: sudo apt-get install -y liblzma-dev
+      - run:
+          # python3.7 should be re-installed due to the issue https://github.com/pytorch/vision/issues/2921
+          name: Select python3.7
+          command: |
+            pyenv uninstall -f 3.7.0
+            pyenv install 3.7.0
+            pyenv global 3.7.0
+      - run:
+          name: Upgrade pip
+          command: |
+            python -m pip install pip --upgrade
+      - run:
+          name: Install PyTorch
+          command: python -m pip install torch==1.8.1+cu102 torchvision==0.9.1+cu102 -f https://download.pytorch.org/whl/torch_stable.html
+      - run:
+          name: Install psutil
+          command: python -m pip install psutil
+      - run:
+          name: Download onnxruntime library and install onnxruntime
+          command: |
+            wget https://github.com/microsoft/onnxruntime/releases/download/v1.8.1/onnxruntime-linux-x64-1.8.1.tgz
+            tar -zxvf onnxruntime-linux-x64-1.8.1.tgz
+            echo 'export ONNXRUNTIME_DIR=$(pwd)/onnxruntime-linux-x64-1.8.1' >> $BASH_ENV
+            echo 'export LD_LIBRARY_PATH=$ONNXRUNTIME_DIR/lib:$LD_LIBRARY_PATH' >> $BASH_ENV
+            source $BASH_ENV
+            python -m pip install onnxruntime==1.8.1
+      - run:
+          name: Build and install
+          command: |
+            rm -rf .eggs
+            python setup.py check -m -s
+            python -m pip install -e .
+          environment:
+            MMCV_WITH_OPS: 1
+            MMCV_WITH_ORT: 1
+      - run:
+          name: Install dependencies for unit test
+          command: |
+            python -m pip install -r requirements/test.txt
+      - run:
+          name: Run unittests and generate coverage report
+          command: |
+            python -m coverage run --branch --source mmcv -m pytest tests/
+            python -m coverage xml
+            python -m coverage report -m
+workflows:
+  unit_tests:
+    jobs:
+      - lint
+      - build_cpu:
+          name: build_py3.8_pt1.9_cpu
+          torch: 1.9.0
+          torchvision: 0.10.0
+          python: "3.8.0"
+          requires:
+            - lint
+      - build_cu102:
+          requires:
+            - build_py3.8_pt1.9_cpu