code: def test_mxnet():
      yield from check_spawn_with_callback(ExtCallbackMX)
  
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 1 for calling a global function with example usage: test_mxnet() without return types