code: def cache_result(self, cls, loaded_val):
      pass
  
imports: import unittest
  from typing import Any, Dict, List
  from parlai.crowdsourcing.utils.analysis import AbstractResultsCompiler
  from collections import defaultdict
label_desc: Use image node_id 2 for calling the MockMephistoDB obj's underlying member method code with example usage: obj.cache_result(cls, loaded_val) without return types