code: def setup_class(cls):
      global np
      np = pytest.importorskip("numpy")
      pytest.importorskip("scipy")
  
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 1 for calling the TestSimilarity obj's underlying member method code with example usage: obj.setup_class(cls) without return types