docstr: Releases resources.
  
  :return:
docstr_tok: ["Releases","resources",".",":","return",":"]
code: def shutdown(self):
      """
      Releases resources.
  
      :return:
      """
      pass
  
file_path: BigDL/python/orca/src/bigdl/orca/learn/base_estimator.py
imports: from abc import ABC, abstractmethod
  from bigdl.dllib.utils.log4Error import invalidInputError
label_desc: Use image node_id 7 for calling the BaseEstimator obj's underlying member method code with example usage: obj.shutdown() without return types