anchor.diff:      # of all non-final lines. Thanks!
       #
       ###########
  +
   RUN pip install flashtext && \
       pip install marisa-trie && \
       pip install pyemd && \
  
positive.code: 
  # OpenCV install (from pip or source)
  RUN pip install opencv-python
      #apt-get -y install libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev && \
      #apt-get -y install libtbb2 libtbb-dev libjpeg-dev libtiff-dev libjasper-dev && \
      #cd /usr/local/src && git clone --depth 1 https://github.com/Itseez/opencv.git && \
      #cd opencv && \
      #mkdir build && cd build && \
      #cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D WITH_TBB=ON -D WITH_FFMPEG=OFF -D WITH_V4L=ON -D WITH_QT=OFF -D WITH_OPENGL=ON -D PYTHON3_LIBRARY=/opt/conda/lib/libpython3.6m.so -D PYTHON3_INCLUDE_DIR=/opt/conda/include/python3.6m/ -D PYTHON_LIBRARY=/opt/conda/lib/libpython3.6m.so -D PYTHON_INCLUDE_DIR=/opt/conda/include/python3.6m/ -D BUILD_PNG=TRUE .. && \
      #make -j $(nproc) && make install && \
      #echo "/usr/local/lib/python3.6/site-packages" > /etc/ld.so.conf.d/opencv.conf && ldconfig && \
      #cp /usr/local/lib/python3.6/site-packages/cv2.cpython-36m-x86_64-linux-gnu.so /opt/conda/lib/python3.6/site-packages/ && \
      # Clean up install cruft
      #rm -rf /usr/local/src/opencv && \
      #rm -rf /root/.cache/pip/* && \
      #apt-get autoremove -y && apt-get clean
  
  RUN apt-get update && apt-get install -y python-software-properties zip && \
      echo "deb http://ppa.launchpad.net/webupd8team/java/ubuntu precise main" | tee -a /etc/apt/sources.list && \
  
negative.code:     pip install conx && \
      pip install pandasql && \
      pip install trackml && \
      ##### ^^^^ Add new contributions above here ^^^^ #####
      # clean up pip cache
      rm -rf /root/.cache/pip/*
  
  # Pin Vowpal Wabbit v8.6.0 because 8.6.1 does not build or install successfully
  RUN cd /usr/local/src && git clone -b 8.6.0 https://github.com/JohnLangford/vowpal_wabbit.git && ./vowpal_wabbit/python/conda_install.sh
  
  # For Facets
  ENV PYTHONPATH=$PYTHONPATH:/opt/facets/facets_overview/python/
  