code: def static_gen_token_unique_id(
      doc_id: int, sent_id: int, token_id: int
  ) -> str:
      return "_".join([str(doc_id), str(sent_id), str(token_id)])
  
file_path: nlp-architect/nlp_architect/common/cdc/mention_data.py
imports: import sys
  from typing import List
  from nlp_architect.utils.io import load_json_file
  from nlp_architect.utils.string_utils import StringUtils
label_desc: Use image node_id 7 for calling the MentionData obj's underlying member method code with example usage: obj.static_gen_token_unique_id(doc_id, sent_id, token_id) and returns: str