code: def higher_is_better(self):
      return {"r@1": True, "r@2": True, "mrr": True}
  
imports: import numpy
  import inspect
  import lm_eval.datasets.mutual.mutual
  from lm_eval.base import Task, rf
  from lm_eval.metrics import mean
label_desc: Use image node_id 15 for calling the MuTualBase obj's underlying member method code with example usage: obj.higher_is_better() and returns: dict