code: def test_neighbor_list():
      """Test invoking NeighborList."""
      N_atoms = 5
      start = 0
      stop = 12
      nbr_cutoff = 3
      ndim = 3
      M_nbrs = 2
      coords = start + np.random.rand(N_atoms, ndim) * (stop - start)
      coords = tf.cast(tf.stack(coords), tf.float32)
      layer = layers.NeighborList(
          N_atoms, M_nbrs, ndim, nbr_cutoff, start, stop
      )
      result = layer(coords)
      assert result.shape == (N_atoms, M_nbrs)
  
imports: import deepchem
  import numpy
  import pytest
  import os
label_desc: Use image node_id 18 for calling a global function with example usage: test_neighbor_list() without return types