code: def criterion(self, pred, label):
      return F.nll_loss(pred, label)
  
imports: from functools import reduce
  import random
  import networkx
  import numpy
  import torch
  import torch.nn
  import torch.nn.functional
  import torch_geometric.nn
  import torch_geometric.utils
  import utils
label_desc: Use image node_id 4 for calling the BaselineMLP obj's underlying member method code with example usage: obj.criterion(pred, label) and returns: F