code: def clustering_factory(clf):
      
      required_methods = ['fit', 'fit_predict']
  
      for method in required_methods:
          if not hasattr(clf, method):
              raise TypeError('"{}" is not in clf. Did you '
                              'pass a clusterer instance?'.format(method))
  
      additional_methods = {
          'plot_silhouette': plot_silhouette,
          'plot_elbow_curve': plot_elbow_curve
      }
  
      for key, fn in six.iteritems(additional_methods):
          if hasattr(clf, key):
              warnings.warn('"{}" method already in clf. '
                            'Overriding anyway. This may '
                            'result in unintended behavior.'.format(key))
          setattr(clf, key, types.MethodType(fn, clf))
      return clf
docs: Embeds scikit-plot plotting methods in an sklearn clusterer instance.
  
      Args:
          clf: Scikit-learn clusterer instance
  
      Returns:
          The same scikit-learn clusterer instance passed in **clf** with
          embedded scikit-plot instance methods.
  
      Raises:
          ValueError: If **clf** does not contain the instance methods necessary
              for scikit-plot instance methods.