[Fix] fixed compatibility of MMCV (#1508)

* fixed GPG key error

* fixed compatibility of MMCV

docker/Dockerfile

 ARG PYTORCH="1.6.0"
 ARG CUDA="10.1"
 ARG CUDNN="7"
-
+ARG MMCV="1.5.0"
+ARG MMDET="2.19.0"
+ARG MMSEG="0.20.0"
 FROM pytorch/pytorch:${PYTORCH}-cuda${CUDA}-cudnn${CUDNN}-devel
 
 ENV TORCH_CUDA_ARCH_LIST="6.0 6.1 7.0+PTX"
 ENV TORCH_NVCC_FLAGS="-Xfatbin -compress-all"
 ENV CMAKE_PREFIX_PATH="$(dirname $(which conda))/../"
 
+# To fix GPG key error when running apt-get update
+RUN apt-key adv --fetch-keys https://developer.download.nvidia.com/compute/cuda/repos/ubuntu1804/x86_64/3bf863cc.pub
+RUN apt-key adv --fetch-keys https://developer.download.nvidia.com/compute/machine-learning/repos/ubuntu1804/x86_64/7fa2af80.pub
+
 RUN apt-get update && apt-get install -y ffmpeg libsm6 libxext6 git ninja-build libglib2.0-0 libsm6 libxrender-dev libxext6 \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/*
 
 # Install MMCV, MMDetection and MMSegmentation
-RUN pip install mmcv-full==1.3.13 -f https://download.openmmlab.com/mmcv/dist/cu101/torch1.6.0/index.html
-RUN pip install mmdet==2.17.0
-RUN pip install mmsegmentation==0.18.0
+ARG PYTORCH
+ARG CUDA
+ARG MMCV
+ARG MMDET
+ARG MMSEG
+RUN ["/bin/bash", "-c", "pip install --no-cache-dir mmcv-full==${MMCV} -f https://download.openmmlab.com/mmcv/dist/cu${CUDA//./}/torch${PYTORCH}/index.html"]
+RUN pip install --no-cache-dir mmdet==${MMDET} mmsegmentation==${MMSEG}
 
 # Install MMDetection3D
 RUN conda clean --all