code: def metric_groups(self) -> List[Tuple[str, Optional[int]]]:
      return self._metric_groups
  
file_path: FATE/python/fate/arch/context/_namespace.py
imports: import logging
  from typing import List, Optional, Tuple
label_desc: Use image node_id 3 for calling the NS obj's underlying member method code with example usage: obj.metric_groups() and returns: self