text: # check library version numbers
  # scipy
  import scipy
  print('scipy: %s' % scipy.__version__)
  # numpy
  import numpy
  print('numpy: %s' % numpy.__version__)
  # matplotlib
  import matplotlib
  print('matplotlib: %s' % matplotlib.__version__)
  # pandas
  import pandas
  print('pandas: %s' % pandas.__version__)
  # statsmodels
  import statsmodels
  print('statsmodels: %s' % statsmodels.__version__)
  # scikit-learn
  import sklearn
  print('sklearn: %s' % sklearn.__version__)