code: def _map_tokens_item(tokens, char_map):
      """Maps tokens to characters, for a single item
  
      Arguments
      ---------
      tokens: iterable
          a single token sequence
      char_map: dict
          a token-to-character mapping
  
      Returns
      -------
      result: list
          a list of tokens
  
      """
      return [char_map[char] for char in tokens]
  
imports: from functools import reduce
  from speechbrain.wordemb.util import expand_to_chars
  import speechbrain
  import torch
  import re
label_desc: Use image node_id 18 for calling a global function with example usage: _map_tokens_item(tokens, char_map) and returns: unknown