code: def __enter__(self):
      pass
  
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 6 for calling the TrainEnsembleAlgorithm obj's underlying member method code with example usage: obj.__enter__() without return types