code: def xlm_tokens_pre_processor(token_ids: List[int]) -> List[int]:
      """Add XLM style special tokens.
  
      Args:
          token_ids: List of token ids without any special tokens.
  
      Returns:
          List of token ids augmented with special tokens.
      """
      XLM_SEP_ID = 1
  
      token_ids.insert(0, XLM_SEP_ID)
      token_ids.append(XLM_SEP_ID)
  
      return token_ids
  
file_path: rasa/rasa/nlu/utils/hugging_face/transformers_pre_post_processors.py
imports: from typing import List, Tuple, Text
  import numpy
label_desc: Use image node_id 6 for calling a global function with example usage: xlm_tokens_pre_processor(token_ids) and returns: token_ids