code: def test_objectmapper_ensemble(self):
      import imblearn.ensemble as ensemble
  
      df = pdml.ModelFrame([])
      self.assertIs(
          df.imbalance.ensemble.BalanceCascade, ensemble.BalanceCascade
      )
      self.assertIs(
          df.imbalance.ensemble.EasyEnsemble, ensemble.EasyEnsemble
      )
  
file_path: pandas-ml/pandas_ml/imbaccessors/test/test_imbalance.py
imports: import pytest
  import numpy
  import pandas_ml
  import pandas_ml.util.testing
label_desc: Use image node_id 4 for calling the TestImbalance obj's underlying member method code with example usage: obj.test_objectmapper_ensemble() without return types