code: def flip(images, bboxes):
      coin = dali.fn.random.coin_flip()
      images = dali.fn.flip(images, horizontal=coin)
      bboxes = dali.fn.bb_flip(bboxes, horizontal=coin, ltrb=True)
      return images, bboxes
  
imports: import nvidia.dali
label_desc: Use image node_id 6 for calling a global function with example usage: flip(images, bboxes) and returns: images,  bboxes