code: def check_token_from_file(token, vocab_file, line_i):
      if (
          not isinstance(token, str)
          or isinstance(token, str)
          and len(token) != 1
      ):
          raise ValueError(
              f"Each line in vocabulary have to be a Python string literal containing 1 character. "
              f"Encountered {repr(token)} on line {line_i} in file {vocab_file}."
          )
  
imports: import json
  import os
  import warnings
  from collections import Counter
  from enum import Enum
  from pathlib import Path
  from typing import Dict, List, NewType, Optional, Union
  from nemo.collections.common.tokenizers.tokenizer_spec import TokenizerSpec
label_desc: Use image node_id 5 for calling the CharTokenizer obj's underlying member method code with example usage: obj.check_token_from_file(token, vocab_file, line_i) without return types