code: def to_smiles(
      data: "torch_geometric.data.Data", kekulize: bool = False
  ) -> Any:
      """Converts a :class:`torch_geometric.data.Data` instance to a SMILES
      string.
  
      Args:
          data (torch_geometric.data.Data): The molecular graph.
          kekulize (bool, optional): If set to :obj:`True`, converts aromatic
              bonds to single/double bonds. (default: :obj:`False`)
      """
      from rdkit import Chem
  
      mol = Chem.RWMol()
  
      assert data.x is not None
      assert data.num_nodes is not None
      assert data.edge_index is not None
      assert data.edge_attr is not None
      for i in range(data.num_nodes):
          atom = Chem.Atom(int(data.x[i, 0]))
          atom.SetChiralTag(
              Chem.rdchem.ChiralType.values[int(data.x[i, 1])]
          )
          atom.SetFormalCharge(
              x_map["formal_charge"][int(data.x[i, 3])]
          )
          atom.SetNumExplicitHs(x_map["num_hs"][int(data.x[i, 4])])
          atom.SetNumRadicalElectrons(
              x_map["num_radical_electrons"][int(data.x[i, 5])]
          )
          atom.SetHybridization(
              Chem.rdchem.HybridizationType.values[int(data.x[i, 6])]
          )
          atom.SetIsAromatic(int(data.x[i, 7]))
          mol.AddAtom(atom)
  
      edges = [tuple(i) for i in data.edge_index.t().tolist()]
      visited = set()
  
      for i in range(len(edges)):
          src, dst = edges[i]
          if tuple(sorted(edges[i])) in visited:
              continue
  
          bond_type = Chem.BondType.values[int(data.edge_attr[i, 0])]
          mol.AddBond(src, dst, bond_type)
  
          # Set stereochemistry:
          stereo = Chem.rdchem.BondStereo.values[
              int(data.edge_attr[i, 1])
          ]
          if stereo != Chem.rdchem.BondStereo.STEREONONE:
              db = mol.GetBondBetweenAtoms(src, dst)
              db.SetStereoAtoms(dst, src)
              db.SetStereo(stereo)
  
          # Set conjugation:
          is_conjugated = bool(data.edge_attr[i, 2])
          mol.GetBondBetweenAtoms(src, dst).SetIsConjugated(
              is_conjugated
          )
  
          visited.add(tuple(sorted(edges[i])))
  
      mol = mol.GetMol()
  
      if kekulize:
          Chem.Kekulize(mol)
  
      Chem.SanitizeMol(mol)
      Chem.AssignStereochemistry(mol)
  
      return Chem.MolToSmiles(mol, isomericSmiles=True)
  
imports: from typing import Any, Dict, List
  import torch
  import torch_geometric
label_desc: Use image node_id 2 for calling a global function with example usage: to_smiles(data, kekulize) and returns: Chem