code: def compute_neighbor_list(
      coords, neighbor_cutoff, max_num_neighbors, periodic_box_size
  ):
      """Computes a neighbor list from atom coordinates."""
      N = coords.shape[0]
      try:
          import mdtraj
      except ModuleNotFoundError:
          raise ImportError(
              "This function requires mdtraj to be installed."
          )
      traj = mdtraj.Trajectory(coords.reshape((1, N, 3)), None)
      box_size = None
      if periodic_box_size is not None:
          box_size = np.array(periodic_box_size)
          traj.unitcell_vectors = np.array(
              [
                  [
                      [box_size[0], 0, 0],
                      [0, box_size[1], 0],
                      [0, 0, box_size[2]],
                  ]
              ],
              dtype=np.float32,
          )
      neighbors = mdtraj.geometry.compute_neighborlist(
          traj, neighbor_cutoff
      )
      neighbor_list = {}
      for i in range(N):
          if (
              max_num_neighbors is not None
              and len(neighbors[i]) > max_num_neighbors
          ):
              delta = coords[i] - coords.take(neighbors[i], axis=0)
              if box_size is not None:
                  delta -= np.round(delta / box_size) * box_size
              dist = np.linalg.norm(delta, axis=1)
              sorted_neighbors = list(zip(dist, neighbors[i]))
              sorted_neighbors.sort()
              neighbor_list[i] = [
                  sorted_neighbors[j][1]
                  for j in range(max_num_neighbors)
              ]
          else:
              neighbor_list[i] = list(neighbors[i])
      return neighbor_list
  
imports: import logging
  import warnings
  import numpy
  from deepchem.feat.base_classes import Featurizer, ComplexFeaturizer
  from deepchem.feat.molecule_featurizers import AtomicCoordinates
  from deepchem.utils.data_utils import pad_array
  from deepchem.utils.rdkit_utils import MoleculeLoadException, get_xyz_from_mol, load_molecule, merge_molecules_xyz, merge_molecules
label_desc: Use image node_id 1 for calling a global function with example usage: compute_neighbor_list(coords, neighbor_cutoff, max_num_neighbors, periodic_box_size) and returns: neighbor_list