code: def test_parameters(self):
      assert (
          hasattr(self.clf, "base_estimators")
          and self.clf.base_estimators is not None
      )
  
imports: import os
  import sys
  import unittest
  import numpy
  from sklearn.model_selection import train_test_split
  from sklearn.tree import DecisionTreeClassifier
  from sklearn.linear_model import LogisticRegression
  from sklearn.ensemble import GradientBoostingClassifier
  from sklearn.ensemble import RandomForestClassifier
  from sklearn.neighbors import KNeighborsClassifier
  from sklearn.datasets import load_breast_cancer
  from numpy.testing import assert_allclose
  from numpy.testing import assert_equal
  from numpy.testing import assert_raises
  from sklearn.metrics import roc_auc_score
  from sklearn.metrics import accuracy_score
  from combo.models.classifier_comb import SimpleClassifierAggregator
  from combo.utils.data import evaluate_print
label_desc: Use image node_id 2 for calling the TestAverage obj's underlying member method code with example usage: obj.test_parameters() without return types