code: def get_tokens(self):
      return self.tokens_number
  
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 4 for calling the MentionData obj's underlying member method code with example usage: obj.get_tokens() and returns: self