code: def _classifiers(self):
          
  
          # sklearn version < 0.18.0
          classifiers = (
              AdaBoostClassifier,
              BernoulliNB,
              DecisionTreeClassifier,
              ExtraTreesClassifier,
              GaussianNB,
              KNeighborsClassifier,
              LinearSVC,
              NuSVC,
              RandomForestClassifier,
              SVC,
          )
  
          # sklearn version >= 0.18.0
          if self.sklearn_ver[:2] >= (0, 18):
              from sklearn.neural_network.multilayer_perceptron \
                  import MLPClassifier
              classifiers += (MLPClassifier, )
  
          return classifiers
docs: Get a set of supported classifiers.
  
          Returns
          -------
          classifiers : {set}
              The set of supported classifiers.