code: def __init__(self, num_classes: int = 2, ignore_index: int = -100):
      self.cumulative_dice = None
      self.num_classes = num_classes
      self.ignore_index = ignore_index
      self.count = None
  
imports: from collections import defaultdict, deque
  import datetime
  import time
  import torch
  import torch.nn.functional
  import torch.distributed
  import errno
  import os
  from .dice_coefficient_loss import multiclass_dice_coeff, build_target
label_desc: Use image node_id 1 to create a new DiceCoefficient object from inherited base classes: object with example: obj = DiceCoefficient(num_classes, ignore_index)