code: def test_bayesian_inference_init(self):
      infer_bayesian = Inference(self.bayesian)
      infer_bayesian._initialize_structures()
      self.assertEqual(
          set(infer_bayesian.variables), {"a", "b", "c", "d", "e"}
      )
      self.assertEqual(
          infer_bayesian.cardinality,
          {"a": 2, "b": 2, "c": 2, "d": 2, "e": 2},
      )
      self.assertIsInstance(infer_bayesian.factors, defaultdict)
      self.assertEqual(
          set(infer_bayesian.factors["a"]),
          set(
              [
                  self.bayesian.get_cpds("a").to_factor(),
                  self.bayesian.get_cpds("b").to_factor(),
              ]
          ),
      )
      self.assertEqual(
          set(infer_bayesian.factors["b"]),
          set(
              [
                  self.bayesian.get_cpds("b").to_factor(),
                  self.bayesian.get_cpds("c").to_factor(),
              ]
          ),
      )
      self.assertEqual(
          set(infer_bayesian.factors["c"]),
          set(
              [
                  self.bayesian.get_cpds("c").to_factor(),
                  self.bayesian.get_cpds("d").to_factor(),
              ]
          ),
      )
      self.assertEqual(
          set(infer_bayesian.factors["d"]),
          set(
              [
                  self.bayesian.get_cpds("d").to_factor(),
                  self.bayesian.get_cpds("e").to_factor(),
              ]
          ),
      )
      self.assertEqual(
          set(infer_bayesian.factors["e"]),
          set([self.bayesian.get_cpds("e").to_factor()]),
      )
  
file_path: pgmpy/pgmpy/tests/test_inference/test_Inference.py
imports: import unittest
  import numpy
  from pgmpy.models import BayesianNetwork
  from pgmpy.models import MarkovNetwork
  from pgmpy.factors.discrete import DiscreteFactor
  from pgmpy.factors.discrete import TabularCPD
  from pgmpy.inference import Inference
  from collections import defaultdict
label_desc: Use image node_id 2 for calling the TestInferenceBase obj's underlying member method code with example usage: obj.test_bayesian_inference_init() without return types