code: def __init__(self) -> None:
      super().__init__()
      self._global_feature_importance = {}
      self._trees = []
      self._saved_tree = []
      self._fid_name_mapping = {}
  
file_path: FATE/python/fate/ml/ensemble/algo/secureboost/hetero/_base.py
imports: from typing import List
  import functools
  from fate.arch.dataframe import DataFrame
  from fate.ml.abc.module import HeteroModule, Model
  from fate.ml.ensemble.learner.decision_tree.tree_core.decision_tree import FeatureImportance, Node
  from typing import Dict
  import numpy
label_desc: Use image node_id 1 to create a new HeteroBoostingTree object from inherited base classes: HeteroModule with example: obj = HeteroBoostingTree()