anchor.diff:  WORKDIR /home/$NB_USER/work
   ENTRYPOINT ["tini", "--"]
   CMD ["start-notebook.sh"]
  -COPY start-notebook.sh /usr/local/bin/
  -COPY start-singleuser.sh /usr/local/bin/
  -COPY jupyter_notebook_config.py /home/$NB_USER/.jupyter/
  +COPY files/start-notebook.sh /usr/local/bin/
  +COPY files/start-singleuser.sh /usr/local/bin/
  +COPY files/jupyter_notebook_config.py /home/$NB_USER/.jupyter/
   RUN chown -R $NB_USER:users /home/$NB_USER/.jupyter && \
       chmod +x /usr/local/bin/*.sh
   
  -# download tf 3.5
  -RUN pip --no-cache-dir install \
  -    https://storage.googleapis.com/tensorflow/linux/cpu/tensorflow-0.10.0-cp35-cp35m-linux_x86_64.whl
  +# download tf 3.5 v1.0.0
  +RUN pip3 install tensorflow==$TF_VERSION
  +# RUN pip --no-cache-dir install \
  +#     https://storage.googleapis.com/tensorflow/linux/cpu/tensorflow-0.10.0-cp35-cp35m-linux_x86_64.whl
   
  -# install some sci packages
  -RUN pip --no-cache-dir install \
  -    pandas \
  -    scikit-learn \
  -    matplotlib \
  -    numpy \
  -    scipy && \
  -    apt-get clean && \
  -    rm -rf /var/lib/apt/lists/*
  +# # install some sci packages
  +# RUN pip --no-cache-dir install \
  +#     pandas \
  +#     scikit-learn \
  +#     matplotlib \
  +#     numpy \
  +#     scipy && \
  +#     apt-get clean && \
  +#     rm -rf /var/lib/apt/lists/*
   
   EXPOSE 6006 8888
positive.code:     $CONDA_DIR/bin/conda install --quiet --yes conda==3.19.1 && \
      $CONDA_DIR/bin/conda config --system --add channels conda-forge && \
      conda clean -tipsy && \
      echo "jpeg 8*" >> /opt/conda/conda-meta/pinned && \ #https://github.com/jupyter/docker-stacks/issues/210
      conda install --quiet --yes \
      'notebook=4.2*' \
      && conda clean -tipsy
  
negative.code: ENV CONDA_DIR='/opt/conda' \
      SHELL='/bin/bash' \
      NB_USER='geek' \
      NB_UID='1000' \
      TF_VERSION='1.0.0'
  
  ENV PATH=$CONDA_DIR/bin:$PATH \
      HOME=/home/$NB_USER
  
  