code: def tearDown(self):
      del self.d1
      del self.m1
      del self.m2
  
imports: import unittest
  import pandas
  from pgmpy.estimators import AICScore, BDeuScore, BDsScore, BicScore, K2Score
  from pgmpy.models import BayesianNetwork
label_desc: Use image node_id 3 for calling the TestBDsScore obj's underlying member method code with example usage: obj.tearDown() without return types