code: def test_async_async_callbacks():
      t = Thread(target=test_async_callbacks)
      t.start()
      t.join()
  
file_path: coremltools/deps/pybind11/tests/test_callbacks.py
imports: import time
  from threading import Thread
  import pytest
  import env
  from pybind11_tests import callbacks
label_desc: Use image node_id 11 for calling a global function with example usage: test_async_async_callbacks() without return types