code: def tearDown(self):
      del self.rand_data
      del self.est_rand
      del self.est_rand_bdeu
      del self.est_rand_bic
      del self.titanic_data
      del self.est_titanic
  
file_path: pgmpy/pgmpy/tests/test_estimators/test_ExhaustiveSearch.py
imports: import unittest
  import numpy
  import pandas
  from pgmpy.estimators import BDeuScore, BicScore, ExhaustiveSearch
label_desc: Use image node_id 6 for calling the TestBaseEstimator obj's underlying member method code with example usage: obj.tearDown() without return types