code: def reverse_dict_list(id2list):
      res = {}
      for key, value in id2list.items():
          for id in value:
              if id not in res:
                  res[id] = []
              res[id].append(key)
      return res
  
file_path: recommenders/examples/07_tutorials/KDD2020-tutorial/utils/general.py
imports: import os
  import numpy
label_desc: Use image node_id 6 for calling a global function with example usage: reverse_dict_list(id2list) and returns: res