code: def compute_cation_pi(mol1, mol2, charge_tolerance=0.01, **kwargs):
      """Finds aromatic rings in mo1 and cations in mol2 that interact with each other.
  
      Parameters:
      -----------
      mol1: rdkit.rdchem.Mol
          Molecule to look for interacting rings
      mol2: rdkit.rdchem.Mol
          Molecule to look for interacting cations
      charge_tolerance: float
          Atom is considered a cation if its formal charge is greater
          than 1 - charge_tolerance
      **kwargs:
          Arguments that are passed to is_cation_pi function
  
      Returns:
      --------
      mol1_pi: dict
          Dictionary that maps atom indices (from mol1) to the number of cations
          (in mol2) they interact with
      mol2_cation: dict
          Dictionary that maps atom indices (from mol2) to the number of aromatic
          atoms (in mol1) they interact with
      """
      mol1_pi = Counter()
      mol2_cation = Counter()
      conformer = mol2.GetConformer()
  
      aromatic_atoms = set(
          atom.GetIdx() for atom in mol1.GetAromaticAtoms()
      )
      from rdkit import Chem
  
      rings = [list(r) for r in Chem.GetSymmSSSR(mol1)]
  
      for ring in rings:
          # if ring from mol1 is aromatic
          if set(ring).issubset(aromatic_atoms):
              ring_center = compute_ring_center(mol1, ring)
              ring_normal = compute_ring_normal(mol1, ring)
  
              for atom in mol2.GetAtoms():
                  # ...and atom from mol2 is a cation
                  if atom.GetFormalCharge() > 1.0 - charge_tolerance:
                      cation_position = np.array(
                          conformer.GetAtomPosition(atom.GetIdx())
                      )
                      # if angle and distance are correct
                      if is_cation_pi(
                          cation_position,
                          ring_center,
                          ring_normal,
                          **kwargs,
                      ):
                          # count atoms forming a contact
                          mol1_pi.update(ring)
                          mol2_cation.update([atom.GetIndex()])
      return mol1_pi, mol2_cation
  
file_path: deepchem/deepchem/utils/noncovalent_utils.py
imports: import numpy
  from collections import Counter
  from deepchem.utils.fragment_utils import get_partial_charge
  from deepchem.utils.rdkit_utils import compute_ring_center
  from deepchem.utils.rdkit_utils import compute_ring_normal
  from deepchem.utils.geometry_utils import angle_between
  from deepchem.utils.geometry_utils import is_angle_within_cutoff
label_desc: Use image node_id 6 for calling a global function with example usage: compute_cation_pi(mol1, mol2, charge_tolerance) and returns: mol1_pi,  mol2_cation