code: def test_laplacian_centrality_FF():
      FF = nx.florentine_families_graph()
      d = nx.laplacian_centrality(FF)
      exact = {
          "Acciaiuoli": 0.0804598,
          "Medici": 0.4022989,
          "Castellani": 0.1724138,
          "Peruzzi": 0.183908,
          "Strozzi": 0.2528736,
          "Barbadori": 0.137931,
          "Ridolfi": 0.2183908,
          "Tornabuoni": 0.2183908,
          "Albizzi": 0.1954023,
          "Salviati": 0.1149425,
          "Pazzi": 0.0344828,
          "Bischeri": 0.1954023,
          "Guadagni": 0.2298851,
          "Ginori": 0.045977,
          "Lamberteschi": 0.0574713,
      }
      for n, dc in d.items():
          assert exact[n] == pytest.approx(dc, abs=1e-7)
  
file_path: networkx/networkx/algorithms/centrality/tests/test_laplacian_centrality.py
imports: import pytest
  import networkx
label_desc: Use image node_id 10 for calling a global function with example usage: test_laplacian_centrality_FF() without return types