code: def test_cpu(self):
      self._test_load_sac(gpu=None)
  
imports: import functools
  import os
  import unittest
  import chainer
  import chainer.functions
  from chainer import links
  from chainer import optimizers
  from chainer import testing
  import numpy
  import chainerrl
  from chainerrl import agents
  from chainerrl import explorers
  from chainerrl import links
  from chainerrl import policies
  from chainerrl.optimizers import rmsprop_async
  from chainerrl.action_value import DiscreteActionValue
  from chainerrl.q_functions import DistributionalDuelingDQN
  from chainerrl.misc import download_model
  from chainerrl import replay_buffer
  from chainerrl import v_functions
label_desc: Use image node_id 2 for calling the TestLoadSAC obj's underlying member method code with example usage: obj.test_cpu() without return types