code: def get_loss_function(self):
      return F.cross_entropy
  
file_path: pytorch-lightning/tests/parity_fabric/models.py
imports: from abc import ABC, abstractmethod
  from typing import Callable
  import torch
  import torch.nn
  import torch.nn.functional
  from torch.optim import Optimizer
  from torch.utils.data import DataLoader, TensorDataset
label_desc: Use image node_id 5 for calling the ConvNet obj's underlying member method code with example usage: obj.get_loss_function() and returns: F