class_docstr: This [`Metric`](./metric.md) breaks with the typical `Metric` API and just stores values that were
  computed in some fashion outside of a `Metric`.  If you have some external code that computes
  the metric for you, for instance, you can use this to report the average result using our
  `Metric` API.
code: def reset(self):
      self._total_value = 0.0
      self._count = 0
  
file_path: allennlp/allennlp/training/metrics/average.py
imports: from allennlp.training.metrics.metric import Metric
  from allennlp.nn.util import dist_reduce_sum
label_desc: Use image node_id 4 for calling the Average obj's underlying member method code with example usage: obj.reset() without return types