docstr: Fit to actual data.
docstr_tok: ["Fit","to","actual","data","."]
code: def fit(self, X_protein, Z_protein, X_ligand, Z_ligand, y):
      """Fit to actual data."""
      return
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import unicode_literals
  import warnings
  import numpy
  import tensorflow
  from deepchem.models import Model
  from deepchem.nn import model_ops
  import deepchem.utils.rdkit_util
label_desc: Use image node_id 4 for calling the VinaModel obj's underlying member method code with example usage: obj.fit(X_protein, Z_protein, X_ligand, Z_ligand, y) without return types