code: def update(self, strategy):
      self._metric.update()
  
imports: import os
  from pathlib import Path
  from typing import Union, Sequence, List, Optional
  from avalanche.evaluation import Metric, GenericPluginMetric
label_desc: Use image node_id 2 for calling the DiskPluginMetric obj's underlying member method code with example usage: obj.update(strategy) without return types