code: def index_list() -> IndexList:
      return defaultdict(list)
  
file_path: dedupe/dedupe/blocking.py
imports: from __future__ import annotations
  import logging
  import time
  from collections import defaultdict
  from typing import TYPE_CHECKING
label_desc: Use image node_id 1 for calling a global function with example usage: index_list() and returns: defaultdict