code: def _log_step_metrics(self, metrics: "StepMetrics"):
      raise NotImplementedError
  
imports: import time
  import typing
  from typing import Dict, List, Optional, Tuple, Union
  import pydantic
  from ._namespace import NS, IndexedNS
label_desc: Use image node_id 2 for calling the BaseMetricsHandler obj's underlying member method code with example usage: obj._log_step_metrics(metrics) without return types