code: def __init__(self):
      self.sum = None
      self.count = 0
      self.reset()
  
imports: import logging
  import os
  import sys
  import time
  import horovod.mxnet
  import mxnet
  from mxboard import SummaryWriter
  from mxnet import nd
  from default import config
  from evaluation import verification
label_desc: Use image node_id 1 to create a new MetricNdarray object from inherited base classes: object with example: obj = MetricNdarray()