docstr: update the latest score data
code: def save_latest_data(self):
      """
      update the latest score data
      """
      write_json(self.pre_score_path, self.data)
  
imports: import os
  import random
  from src.common.constant import Config
  from src.tools.io_tools import read_json, write_json
  from src.query_api.singleton import Singleton
  from src.tools.io_tools import read_pickle
  from src.tools.compute import generate_global_rank
label_desc: Use image node_id 7 for calling the ImgScoreQueryApi obj's underlying member method code with example usage: obj.save_latest_data() without return types