code: def setUp(self):
      self.network = DBN()
  
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 TestDynamicBayesianNetworkCreation obj's underlying member method code with example usage: obj.setUp() without return types