code: def bert_tokens_pre_processor(token_ids: List[int]) -> List[int]:
      """Add BERT style special tokens(CLS and SEP).
  
      Args:
          token_ids: List of token ids without any special tokens.
  
      Returns:
          List of token ids augmented with special tokens.
      """
      BERT_CLS_ID = 101
      BERT_SEP_ID = 102
  
      processed_tokens = token_ids
  
      processed_tokens.insert(0, BERT_CLS_ID)
      processed_tokens.append(BERT_SEP_ID)
  
      return processed_tokens
  
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 2 for calling a global function with example usage: bert_tokens_pre_processor(token_ids) and returns: processed_tokens