code: def __str__(self):
      loss_str = []
      for name, meter in self.meters.items():
          loss_str.append("{}: {}".format(name, str(meter)))
      return self.delimiter.join(loss_str)
  
imports: from collections import defaultdict, deque
  import datetime
  import pickle
  import time
  import errno
  import os
  import torch
  import torch.distributed
label_desc: Use image node_id 4 for calling the MetricLogger obj's underlying member method code with example usage: obj.__str__() and returns: self