code: def reset(self):
      if self.cumulative_dice is not None:
          self.cumulative_dice.zero_()
  
      if self.count is not None:
          self.count.zeros_()
  
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 4 for calling the DiceCoefficient obj's underlying member method code with example usage: obj.reset() without return types