code: def get_children_left(self) -> np.ndarray:
      return np.array(self.children_left, dtype=int)
  
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 17 for calling the ShadowLightGBMTree obj's underlying member method code with example usage: obj.get_children_left() and returns: np