code: def forward(self, x):
      if self.sleep_sec > 0:
          time.sleep(self.sleep_sec)
      return {
          "loss": x.sum() + sum([x.mean() for x in self.parameters()])
      }
  
imports: import json
  import math
  import os
  import tempfile
  import time
  import unittest
  from unittest import mock
  import torch
  from fvcore.common.checkpoint import Checkpointer
  from torch import nn
  from detectron2 import model_zoo
  from detectron2.config import configurable, get_cfg
  from detectron2.engine import DefaultTrainer, SimpleTrainer, default_setup, hooks
  from detectron2.modeling.meta_arch import META_ARCH_REGISTRY
  from detectron2.utils.events import CommonMetricPrinter, JSONWriter
label_desc: Use image node_id 3 for calling the _SimpleModel obj's underlying member method code with example usage: obj.forward(x) and returns: dict