code: def _test():
      """test function for this module"""
  
      # perform doctest
      import sys
      import doctest
  
      doctest.testmod()
  
      sys.exit(0)
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import unicode_literals
  import logging
  import numpy
  from scipy.optimize import fmin_cg
  from sklearn.linear_model import LogisticRegression
  from sklearn.base import BaseEstimator, ClassifierMixin
label_desc: Use image node_id 2 for calling a global function with example usage: _test() without return types