code: def merge_molecules_xyz(xyzs):
      """Merges coordinates of multiple molecules.
  
      Parameters
      ----------
      xyzs: List
          List of numpy arrays each of shape `(N_i, 3)` where `N_i` is the number of atoms in the i-th atom.
      """
      return np.array(np.vstack(np.vstack(xyzs)))
  
imports: import os
  import logging
  import itertools
  import numpy
  from io import StringIO
  from deepchem.utils.pdbqt_utils import pdbqt_to_pdb
  from deepchem.utils.pdbqt_utils import convert_mol_to_pdbqt
  from deepchem.utils.pdbqt_utils import convert_protein_to_pdbqt
  from deepchem.utils.geometry_utils import compute_pairwise_distances
  from deepchem.utils.geometry_utils import compute_centroid
  from deepchem.utils.fragment_utils import MolecularFragment
  from deepchem.utils.fragment_utils import MoleculeLoadException
  from typing import Any, List, Sequence, Tuple, Set, Optional, Dict, Union
  from deepchem.utils.typing import OneOrMany, RDKitMol
label_desc: Use image node_id 8 for calling a global function with example usage: merge_molecules_xyz(xyzs) and returns: np