anchor.diff:  
   # -------------------- Conda environment --------------------
   RUN curl -o ~/miniconda.sh -O  https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh  && \
  -     sh ~/miniconda.sh -b -p /conda
  +     sh ~/miniconda.sh -b -p /conda && rm ~/miniconda.sh
   ENV PATH /conda/bin:$PATH
   ENV LD_LIBRARY_PATH /conda/lib:$LD_LIBRARY_PATH
   
  -RUN conda install -y -c anaconda numpy pyyaml scipy mkl setuptools cmake cffi mkl-include typing
  -RUN conda install -y -c mingfeima mkldnn
  -# RUN conda install -y -c conda-forge openmpi
  -RUN conda install -y -c soumith magma-cuda90
  +RUN conda install -y -c anaconda numpy pyyaml scipy mkl setuptools cmake cffi mkl-include typing \
  +    && conda install -y -c mingfeima mkldnn \
  +    && conda install -y -c soumith magma-cuda90 \
  +    && conda install -y -c conda-forge python-lmdb opencv numpy \
  +    && conda clean --all -y
   
   # -------------------- Open MPI --------------------
   RUN mkdir /.openmpi/
  -RUN wget https://www.open-mpi.org/software/ompi/v3.0/downloads/openmpi-3.0.0.tar.gz
  -RUN gunzip -c openmpi-3.0.0.tar.gz | tar xf - \
  +RUN apt-get update && apt-get install -y --no-install-recommends wget \
  +    && wget https://www.open-mpi.org/software/ompi/v3.0/downloads/openmpi-3.0.0.tar.gz\
  +    && gunzip -c openmpi-3.0.0.tar.gz | tar xf - \
       && cd openmpi-3.0.0 \
       && ./configure --prefix=/.openmpi/ --with-cuda\
  -    && make all install
  +    && make all install \
  +    && rm /openmpi-3.0.0.tar.gz \
  +    && rm -rf /openmpi-3.0.0 \
  +    && apt-get remove -y wget
   
   ENV PATH /.openmpi/bin:$PATH
   ENV LD_LIBRARY_PATH /.openmpi/lib
  
positive.code: FROM nvidia/cuda:9.0-cudnn7-devel-ubuntu16.04
  # TODO: reduce size and complexity of image.
  
  RUN apt-get update && apt-get install -y \
      gcc \
      make \
      libc-dev \
      musl-dev \
      openssh-server
  
  RUN apt-get update && apt-get install -y \
      g++
  
  RUN apt-get update && apt-get install -y \
      git \
      curl \
      sudo
  
negative.code: # RUN conda install -y -c conda-forge tqdm 
  # # RUN conda install -y -c pchrapka zmq
  # # RUN conda install -c omnia termcolor
  
  # -------------------- patch --------------------
  # libGL.so.1 might be lost when nvidia driver is installed
  