code: def tearDown(self):
      del self.rand_data
      del self.est_rand
      del self.model1
      del self.titanic_data
      del self.titanic_data1
      del self.titanic_data2
      del self.est_titanic1
      del self.est_titanic2
  
file_path: pgmpy/pgmpy/tests/test_estimators/test_HillClimbSearch.py
imports: import unittest
  import numpy
  import pandas
  from pgmpy.estimators import HillClimbSearch, K2Score
  from pgmpy.models import BayesianNetwork
label_desc: Use image node_id 9 for calling the TestHillClimbEstimator obj's underlying member method code with example usage: obj.tearDown() without return types