anchor.diff:      'numexpr=2.5*' \
       'matplotlib=1.5*' \
       'scipy=0.17*' \
  -    'lmfit=0.9*' \
  +    #'lmfit=0.9*' \
       'seaborn=0.7*' \
       'sympy=1.0*' \
       'cython=0.24*' \
  
positive.code: 
  RUN conda config --add channels brian-team
  # TODO: Update ipywidgets to 5.1*
  # Install Python 3 packages
  RUN conda install --quiet --yes \
      'ipywidgets=4.1*' \
  
negative.code:     'numexpr=2.5*' \
      'matplotlib=1.5*' \
      'scipy=0.17*' \
      #'lmfit=0.9*' \
      'seaborn=0.7*' \
      'sympy=1.0*' \
      'cython=0.24*' \
  