code: def test_gpu(self):
      self._test_load_iqn(gpu=0)
  
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 4 for calling the TestLoadIQN obj's underlying member method code with example usage: obj.test_gpu() without return types