code: def update(self, strategy):
      self._metric.update()
  
imports: import os
  import warnings
  from typing import Optional, List
  from psutil import Process
  from avalanche.evaluation import Metric, PluginMetric, GenericPluginMetric
  from avalanche.evaluation.metrics import Mean
label_desc: Use image node_id 2 for calling the CPUPluginMetric obj's underlying member method code with example usage: obj.update(strategy) without return types