class_docstr: Base class of metrics.
class_docstr_tok: ["Base","class","of","metrics","."]
docstr: Some initialization in subclass.
docstr_tok: ["Some","initialization","in","subclass","."]
code: def _init(self):
      """Some initialization in subclass."""
      pass
  
imports: import time
  from abc import ABC
  from typing import Dict, Optional, Tuple
label_desc: Use image node_id 6 for calling the AbstractMetric obj's underlying member method code with example usage: obj._init() without return types