code: def test_copy_to_external():
      for use_tl in [False, True]:
          for non_blocking in [False, True]:
              yield _test_copy_to_external, use_tl, non_blocking
  
file_path: DALI/dali/test/python/test_copy_to_external_torch.py
imports: import ctypes
  import numpy
  import nvidia.dali.fn
  import torch
  from nvidia.dali import pipeline_def
  from nvidia.dali import types
  from nvidia.dali.backend import TensorListGPU
label_desc: Use image node_id 4 for calling a global function with example usage: test_copy_to_external() without return types