code: def testGPUWait3(self):
      wait_for_gpu("GPU-aaa", delay_s=0)
  
imports: import copy
  from collections import OrderedDict
  import pytest
  import sys
  import unittest
  from unittest.mock import patch
  from ray.tune.utils.util import wait_for_gpu
  from ray.tune.utils.util import flatten_dict, unflatten_dict, unflatten_list_dict
label_desc: Use image node_id 4 for calling the GPUTest obj's underlying member method code with example usage: obj.testGPUWait3() without return types