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