code: def test_shortest_path_length(self):
      node_features = np.random.rand(5, 10)
      edge_index = np.array(
          [[0, 1, 2, 3, 4], [1, 2, 3, 4, 0]], dtype=np.int64
      )
      graph_data = GraphData(node_features, edge_index)
  
      lengths = shortest_path_length(graph_data, 0)
      assert lengths == {0: 0, 1: 1, 2: 2, 3: 2, 4: 1}
  
      lengths_cutoff = shortest_path_length(graph_data, 0, cutoff=1)
      assert lengths_cutoff == {0: 0, 1: 1, 4: 1}
  
file_path: deepchem/deepchem/feat/tests/test_graph_data.py
imports: import unittest
  import numpy
  import pytest
  from deepchem.feat.graph_data import BatchGraphData, GraphData, shortest_path_length
label_desc: Use image node_id 8 for calling the TestGraph obj's underlying member method code with example usage: obj.test_shortest_path_length() without return types