code: def dice(input, target):
      epsilon = 1e-8
      iflat = input.view(-1)
      tflat = target.view(-1)
      intersection = (iflat * tflat).sum()
      return 2 * intersection / (iflat.sum() + tflat.sum() + epsilon)
  
imports: import torch
  import torch.nn
label_desc: Use image node_id 1 for calling a global function with example usage: dice(input, target) and returns: unknown