code: def test_actor():
      transform = dgl.AddSelfLoop(allow_duplicate=True)
  
      g = dgl.data.ActorDataset(force_reload=True)[0]
      assert g.num_nodes() == 7600
      assert g.num_edges() == 33391
      g2 = dgl.data.ActorDataset(
          force_reload=True, transform=transform
      )[0]
      assert g2.num_edges() - g.num_edges() == g.num_nodes()
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_actor() without return types