code: def renamed_class(cls):
      
  
      class DeprecationWrapper(cls):
          def __init__(self, config=None, env=None, logger_creator=None):
              old_name = cls.__name__.replace("Trainer", "Agent")
              new_name = cls.__name__
              logger.warn("DeprecationWarning: {} has been renamed to {}. ".
                          format(old_name, new_name) +
                          "This will raise an error in the future.")
              cls.__init__(self, config, env, logger_creator)
  
      DeprecationWrapper.__name__ = cls.__name__
  
      return DeprecationWrapper
docs: Helper class for renaming Agent => Trainer with a warning.