code: def __exit__(self, exc_type, exc_value, traceback):
      if self.model is not None:
          del self.model
  
imports: from abc import ABC, abstractmethod
  import lightgbm
  import numpy
  from sklearn.ensemble import RandomForestClassifier, RandomForestRegressor
  import xgboost
  from benchmarks.timer import Timer
  from benchmarks.datasets import LearningTask
label_desc: Use image node_id 7 for calling the TrainEnsembleAlgorithm obj's underlying member method code with example usage: obj.__exit__(exc_type, exc_value, traceback) without return types