code: def _check_special_token_identifier(key):
      """Raise error if the key is not valid as a key for the special token.
  
      Parameters
      ----------
      key
          The identifier
      """
      if not (key.endswith("_token") and key != "_token"):
          raise ValueError(
              'Each key needs to have the form "name_token".'
              " Received {}".format(key)
          )
  
imports: import collections
  import json
  import warnings
  import numpy
  from typing import Dict, Hashable, List, Optional, Counter, Union, Tuple
label_desc: Use image node_id 1 for calling a global function with example usage: _check_special_token_identifier(key) without return types