code: def test_symmetry_with_custom_matching(self):
      print("G2 is edge (a,b) and G3 is edge (a,a)")
      print("but node order for G2 is (a,b) while for G3 it is (b,a)")
  
      a, b = "A", "B"
      G2 = nx.Graph()
      G2.add_nodes_from((a, b))
      G2.add_edges_from([(a, b)])
      G3 = nx.Graph()
      G3.add_nodes_from((b, a))
      G3.add_edges_from([(a, a)])
      for G in (G2, G3):
          for n in G:
              G.nodes[n]["attr"] = n
          for e in G.edges:
              G.edges[e]["attr"] = e
      match = lambda x, y: x == y
  
      print("Starting G2 to G3 GED calculation")
      assert (
          nx.graph_edit_distance(
              G2, G3, node_match=match, edge_match=match
          )
          == 1
      )
  
      print("Starting G3 to G2 GED calculation")
      assert (
          nx.graph_edit_distance(
              G3, G2, node_match=match, edge_match=match
          )
          == 1
      )
  
imports: import pytest
  import networkx
  from networkx.algorithms.similarity import graph_edit_distance, optimal_edit_paths, optimize_graph_edit_distance
  from networkx.generators.classic import circular_ladder_graph, cycle_graph, path_graph, wheel_graph
label_desc: Use image node_id 45 for calling the TestSimilarity obj's underlying member method code with example usage: obj.test_symmetry_with_custom_matching() without return types