code: def test_get_cardinality(self):
      self.graph.add_edges_from(
          [(("a", "b", "c"), ("a", "b")), (("a", "b", "c"), ("a", "c"))]
      )
  
      self.assertDictEqual(self.graph.get_cardinality(), {})
  
      phi1 = DiscreteFactor(
          ["a", "b", "c"], [1, 2, 2], np.random.rand(4)
      )
      self.graph.add_factors(phi1)
      self.assertDictEqual(
          self.graph.get_cardinality(), {"a": 1, "b": 2, "c": 2}
      )
      self.graph.remove_factors(phi1)
      self.assertDictEqual(self.graph.get_cardinality(), {})
  
      phi1 = DiscreteFactor(["a", "b"], [1, 2], np.random.rand(2))
      phi2 = DiscreteFactor(["a", "c"], [1, 2], np.random.rand(2))
      self.graph.add_factors(phi1, phi2)
      self.assertDictEqual(
          self.graph.get_cardinality(), {"a": 1, "b": 2, "c": 2}
      )
  
      phi3 = DiscreteFactor(["a", "c"], [1, 1], np.random.rand(1))
      self.graph.add_factors(phi3)
      self.assertDictEqual(
          self.graph.get_cardinality(), {"c": 1, "b": 2, "a": 1}
      )
  
      self.graph.remove_factors(phi1, phi2, phi3)
      self.assertDictEqual(self.graph.get_cardinality(), {})
  
imports: import unittest
  import numpy
  from pgmpy.factors.discrete import DiscreteFactor
  from pgmpy.models import ClusterGraph
  from pgmpy.tests import help_functions
label_desc: Use image node_id 2 for calling the TestClusterGraphMethods obj's underlying member method code with example usage: obj.test_get_cardinality() without return types