code: def nclasses(self) -> int:
      if self.booster._Booster__num_class == 1:
          return 2
      else:
          return self.booster._Booster__num_class
  
imports: from collections import defaultdict
  from typing import List, Mapping
  import numpy
  import pandas
  from lightgbm.basic import Booster
  from dtreeviz.models.shadow_decision_tree import ShadowDecTree, VisualisationNotYetSupportedError
  from dtreeviz import utils
label_desc: Use image node_id 11 for calling the ShadowLightGBMTree obj's underlying member method code with example usage: obj.nclasses() and returns: int, self