code: def setUp(self):
      self.G = DBN()
      self.G.add_edges_from(
          [
              (("D", 0), ("G", 0)),
              (("I", 0), ("G", 0)),
              (("D", 0), ("D", 1)),
              (("I", 0), ("I", 1)),
          ]
      )
      """
          G.edges()
          [(('I', 0), ('G', 0)), (('I', 0), ('I', 1)),
           (('D', 1), ('G', 1)), (('D', 0), ('G', 0)),
           (('D', 0), ('D', 1)), (('I', 1), ('G', 1))]
  
          """
  
imports: import unittest
  import numpy
  import numpy.testing
  import pandas
  import pgmpy.tests.help_functions
  from pgmpy.factors.discrete import TabularCPD
  from pgmpy.inference import CausalInference, DBNInference, VariableElimination
  from pgmpy.models import BayesianNetwork
  from pgmpy.models import DynamicBayesianNetwork
label_desc: Use image node_id 1 for calling the TestDynamicBayesianNetworkMethods2 obj's underlying member method code with example usage: obj.setUp() without return types