docs: def hyperparameters(self):
          """Return hyperparameters used by your custom TensorFlow code during model training."""
          hyperparameters = super(RLEstimator, self).hyperparameters()
  
          additional_hyperparameters = {SAGEMAKER_OUTPUT_LOCATION: self.output_path,
                                        # TODO: can be applied to all other estimators
                                        SAGEMAKER_ESTIMATOR: SAGEMAKER_ESTIMATOR_VALUE}
  
          hyperparameters.update(Framework._json_encode_hyperparameters(additional_hyperparameters))
          return hyperparameters