code: def _escaped_token_to_subtoken_ids(self, escaped_token):
      
      return [
          self._subtoken_string_to_id[subtoken]
          for subtoken in self._escaped_token_to_subtoken_strings(escaped_token)
      ]
docs: Converts an escaped token string to a list of subtoken IDs.
  
      Args:
        escaped_token: An escaped token as a unicode string.
      Returns:
        A list of subtoken IDs as integers.