code: def rename_model(self, old_model, new_model):
          
          # TODO: raise error if old_feature not found?
  
          self._check_label(new_model)
          self._rename_label('model', old_model, new_model)
docs: Change the label of a model attached to the Bundle
  
          :parameter str old_model: the current name of the model
              (must exist)
          :parameter str new_model: the desired new name of the model
              (must not exist)
          :return: None
          :raises ValueError: if the new_model is forbidden