code: def reset(self) -> None:
      self._metric.reset()
  
imports: from collections import defaultdict
  from typing import Dict, List, Union, TYPE_CHECKING
  import numpy
  import torch
  from torch import Tensor
  from avalanche.benchmarks import OnlineCLExperience
  from avalanche.evaluation import GenericPluginMetric, Metric, PluginMetric
  from avalanche.evaluation.metrics.mean import Mean
  from avalanche.evaluation.metric_utils import phase_and_task, stream_type, generic_get_metric_name, default_metric_name_template
  from avalanche.evaluation.metric_results import MetricValue
label_desc: Use image node_id 3 for calling the CumulativeAccuracyPluginMetric obj's underlying member method code with example usage: obj.reset() without return types