code: def test_cpu(self):
      self._test_load_sac(gpu=None)
  
imports: import os
  import numpy
  import pytest
  import torch
  from torch import nn
  import pfrl
  import pfrl.nn
  from pfrl import agents, explorers, replay_buffers
  from pfrl.initializers import init_chainer_default
  from pfrl.utils import download_model
label_desc: Use image node_id 3 for calling the TestLoadSAC obj's underlying member method code with example usage: obj.test_cpu() without return types