class_docstr: Abstract Base Search Engine class. For hyper paramter tuning.
docstr: Get the best trials from .
  :param k: trials to be selected
  :return: the config of best k trials
code: def get_best_trials(self, k):
      """
      Get the best trials from .
      :param k: trials to be selected
      :return: the config of best k trials
      """
      pass
  
file_path: BigDL/python/orca/src/bigdl/orca/automl/search/base.py
imports: from abc import ABC, abstractmethod
label_desc: Use image node_id 2 for calling the SearchEngine obj's underlying member method code with example usage: obj.get_best_trials(k) without return types