docstr: Save model to model_path.
  
  :param model_path: path to save the trained model.
  :return:
docstr_tok: ["Save","model","to","model_path",".",":","param","model_path",":","path","to","save","the","trained","model",".",":","return",":"]
code: def save(self, model_path):
      """
      Save model to model_path.
  
      :param model_path: path to save the trained model.
      :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 5 for calling the Estimator obj's underlying member method code with example usage: obj.save(model_path) without return types