code: def test_mxnet_cuda():
      callback = ExtCallbackMXCuda((4, 5), 10, np.int32)
      pipe = create_pipe(
          callback,
          "cpu",
          5,
          py_num_workers=6,
          py_start_method="spawn",
          parallel=True,
      )
      build_and_run_pipeline(pipe)
  
file_path: DALI/dali/test/python/test_external_source_parallel_mxnet.py
imports: import mxnet
  from nose import with_setup
  from nose_utils import raises
  from test_pool_utils import setup_function
  from test_external_source_parallel_utils import ExtCallback, check_spawn_with_callback, create_pipe, build_and_run_pipeline
  import numpy
label_desc: Use image node_id 2 for calling a global function with example usage: test_mxnet_cuda() without return types