code: def __del__(self):
      if self.model is not None:
          thundergbm.model_free(byref(self.model))
  
imports: from sklearn.base import BaseEstimator
  from sklearn.base import RegressorMixin, ClassifierMixin
  from sklearn.metrics import mean_squared_error, accuracy_score
  import numpy
  import scipy.sparse
  import statistics
  from sklearn.utils import check_X_y
  from ctypes import *
  from os import path
  from sys import platform
label_desc: Use image node_id 2 for calling the TGBMModel obj's underlying member method code with example usage: obj.__del__() without return types