docstr: 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:
      """
      raise NotImplementedError
  
file_path: analytics-zoo/pyzoo/zoo/orca/learn/base_estimator.py
imports: from abc import ABC, abstractmethod
label_desc: Use image node_id 5 for calling the BaseEstimator obj's underlying member method code with example usage: obj.save(model_path) without return types