code: def __init__(self, num_classes):
      self.num_classes = num_classes
      self.mat = None
  
imports: from collections import defaultdict, deque
  import datetime
  import time
  import torch
  import torch.distributed
  import errno
  import os
label_desc: Use image node_id 1 to create a new ConfusionMatrix object from inherited base classes: object with example: obj = ConfusionMatrix(num_classes)