code: def tearDown(self):
      del self.phi1
      del self.phi2
      del self.phi3
  
imports: import unittest
  import numpy
  import numpy.testing
  from pgmpy.factors.distributions import GaussianDistribution
label_desc: Use image node_id 12 for calling the TestJGDMethods obj's underlying member method code with example usage: obj.tearDown() without return types