code: def tearDown(self):
      del self.G1
      del self.G2
  
imports: import unittest
  import networkx
  import pandas
  import numpy
  from pgmpy.models import NaiveBayes
  from pgmpy.independencies import Independencies
label_desc: Use image node_id 6 for calling the TestNaiveBayesMethods obj's underlying member method code with example usage: obj.tearDown() without return types