code: def test_cpu(self):
      debug_launcher(test_script.main)
  
imports: import unittest
  from accelerate import debug_launcher
  from accelerate.test_utils import require_cpu, test_ops, test_script
label_desc: Use image node_id 1 for calling the MultiCPUTester obj's underlying member method code with example usage: obj.test_cpu() without return types