code: def test_laplacian_centrality_KC():
      KC = nx.karate_club_graph()
      d = nx.laplacian_centrality(KC)
      exact = {
          0: 0.2543593,
          1: 0.1724524,
          2: 0.2166053,
          3: 0.0964646,
          4: 0.0350344,
          5: 0.0571109,
          6: 0.0540713,
          7: 0.0788674,
          8: 0.1222204,
          9: 0.0217565,
          10: 0.0308751,
          11: 0.0215965,
          12: 0.0174372,
          13: 0.118861,
          14: 0.0366341,
          15: 0.0548712,
          16: 0.0172772,
          17: 0.0191969,
          18: 0.0225564,
          19: 0.0331147,
          20: 0.0279955,
          21: 0.0246361,
          22: 0.0382339,
          23: 0.1294193,
          24: 0.0227164,
          25: 0.0644697,
          26: 0.0281555,
          27: 0.075188,
          28: 0.0364742,
          29: 0.0707087,
          30: 0.0708687,
          31: 0.131019,
          32: 0.2370821,
          33: 0.3066709,
      }
      for n, dc in d.items():
          assert exact[n] == pytest.approx(dc, abs=1e-7)
  
      # Check not normalized
      full_energy = 12502
      dnn = nx.laplacian_centrality(KC, normalized=False)
      for n, dc in dnn.items():
          assert exact[n] * full_energy == pytest.approx(dc, abs=1e-3)
  
file_path: networkx/networkx/algorithms/centrality/tests/test_laplacian_centrality.py
imports: import pytest
  import networkx
label_desc: Use image node_id 6 for calling a global function with example usage: test_laplacian_centrality_KC() without return types