code: def forward(self, x, target):
      x = self.classifier(self.base(x))
      return {"losses": {"total_loss": self.loss(x, target)}}
  
imports: import argparse
  import os
  import unittest
  from copy import deepcopy
  import torch
  from mmf.common.registry import registry
  from mmf.models.base_model import BaseModel
  from mmf.trainers.callbacks.lr_scheduler import LRSchedulerCallback
  from mmf.utils.configuration import load_yaml
  from omegaconf import OmegaConf
label_desc: Use image node_id 2 for calling the SimpleModule obj's underlying member method code with example usage: obj.forward(x, target) and returns: dict