class_docstr: Abstract Base class for Feature transformers.
docstr: save the feature tools internal variables.
  Some of the variables are derived after fit_transform, so only saving config is not enough.
  :param: file_path : the file to be saved
  :param: config: the trial config
  :return:
code: def save(self, file_path):
      """
      save the feature tools internal variables.
      Some of the variables are derived after fit_transform, so only saving config is not enough.
      :param: file_path : the file to be saved
      :param: config: the trial config
      :return:
      """
      pass
  
file_path: analytics-zoo/pyzoo/zoo/chronos/autots/deprecated/feature/abstract.py
imports: from abc import ABC, abstractmethod
label_desc: Use image node_id 3 for calling the BaseFeatureTransformer obj's underlying member method code with example usage: obj.save(file_path) without return types