code: def best(self) -> Dict:
      return {name: meter.best for name, meter in self._named_meters()}
  
imports: from __future__ import annotations
  import warnings
  import json
  from typing import Dict, Union, Optional
  from collections import OrderedDict
  from .meters import Meter
label_desc: Use image node_id 15 for calling the MeterDict obj's underlying member method code with example usage: obj.best() and returns: unknown