code: def pipeline_runtime(flip_vertical, flip_horizontal):
      data, _ = fn.readers.file(file_root=images_dir)
      img = fn.decoders.image(data)
      flipped = fn.flip(
          img, horizontal=flip_horizontal, vertical=flip_vertical
      )
      return flipped, img
  
file_path: DALI/dali/test/python/test_pipeline_decorator.py
imports: from nvidia.dali import Pipeline, pipeline_def
  from nose.tools import nottest
  from nose_utils import raises
  import nvidia.dali.fn
  from test_utils import get_dali_extra_path, compare_pipelines
  import os
label_desc: Use image node_id 3 for calling a global function with example usage: pipeline_runtime(flip_vertical, flip_horizontal) and returns: flipped,  img