code: def _tag(self, line):
      fn_by_tag = {
          "attribute": self._tag_attribute,
          "frequency": self._tag_frequency,
          "horizon": self._tag_horizon,
          "missing": self._tag_missing,
          "equallength": self._tag_equallength,
          "data": self._tag_data,
      }
      tag, *args = line.split(" ")
  
      if tag not in fn_by_tag:
          return
  
      return fn_by_tag[tag](*args)
  
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 6 for calling the TSFReader obj's underlying member method code with example usage: obj._tag(line) and returns: fn_by_tag