Dockefile updated to Pytorch 1.3 (#1615)

docker/Dockerfile

-ARG PYTORCH="1.1.0"
-ARG CUDA="10.0"
-ARG CUDNN="7.5"
+ARG PYTORCH="1.3"
+ARG CUDA="10.1"
+ARG CUDNN="7"
 
 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))/../"
+
 RUN apt-get update && apt-get install -y libglib2.0-0 libsm6 libxrender-dev libxext6 \
  && apt-get clean \
  && rm -rf /var/lib/apt/lists/*