code: def test_constant_fn():
      for device in ["cpu", "gpu"]:
          for array_interface in array_interfaces:
              yield _test_func, device, array_interface
  
imports: import numpy
  import nvidia.dali
  import nvidia.dali.fn
  import nvidia.dali.ops
  import nvidia.dali.types
  import os
  from nvidia.dali import Pipeline
  from test_utils import check_batch
  from test_utils import get_dali_extra_path
label_desc: Use image node_id 6 for calling a global function with example usage: test_constant_fn() without return types