code: def test_objectmapper(self):
      df = pdml.ModelFrame([])
      self.assertIs(
          df.calibration.CalibratedClassifierCV,
          calibration.CalibratedClassifierCV,
      )
  
imports: import sklearn.calibration
  import pandas_ml
  import pandas_ml.util.testing
label_desc: Use image node_id 1 for calling the TestCalibration obj's underlying member method code with example usage: obj.test_objectmapper() without return types