code: def _tag_frequency(self, frequency):
      self.meta.frequency = frequency
  
imports: from datetime import datetime
  from distutils.util import strtobool
  from types import SimpleNamespace
  from typing import Dict
  import numpy
  from toolz import compose_left
  from gluonts import json
  from gluonts.exceptions import GluonTSDataError
label_desc: Use image node_id 8 for calling the TSFReader obj's underlying member method code with example usage: obj._tag_frequency(frequency) without return types