code: def __str__(self):
      mae = self.compute()
      return f"MAE: {mae:.3f}"
  
imports: from collections import defaultdict, deque
  import datetime
  import time
  import torch
  import torch.distributed
  import torch.nn.functional
  import errno
  import os
label_desc: Use image node_id 5 for calling the MeanAbsoluteError obj's underlying member method code with example usage: obj.__str__() and returns: str, mae