code: def test_iv_transformations_union(self):
      scale = {}
      for u, v in self.union.graph.edges():
          full_graph, dependent_var = self.union._iv_transformations(
              u, v, scaling_indicators=scale
          )
          self.assertFalse((u, v) in full_graph.edges())
          self.assertEqual(dependent_var, v)
  
imports: import os
  import unittest
  import networkx
  import numpy
  import numpy.testing
  from pgmpy.models import SEM, SEMAlg, SEMGraph
label_desc: Use image node_id 11 for calling the TestSEMGraph obj's underlying member method code with example usage: obj.test_iv_transformations_union() without return types