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 tempfile
  import unittest
  from copy import deepcopy
  from unittest.mock import Mock
  import torch
  from mmf.common.meter import Meter
  from mmf.common.registry import registry
  from mmf.common.report import Report
  from mmf.models.base_model import BaseModel
  from mmf.trainers.callbacks.logistics import LogisticsCallback
  from mmf.utils.configuration import load_yaml
  from mmf.utils.file_io import PathManager
  from mmf.utils.logger import setup_logger
  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