docs: def set_row_names(self, row_names):
          """ Setup the feature vector with some column names
          :param row_names: the column names we want
          :return:
          """
          if self.row_count() != len(row_names) or len(self._row_name_list) > 0 or len(self._row_name_idx) > 0:
              raise NotImplementedError("You can only manually set names once data has been added")
  
          for idx, k in enumerate(row_names):
              self._row_name_idx[k] = idx
  
          self._row_name_list = row_names