code: def test_iou_score():
      box1 = [(0, 0), (100, 0), (100, 100), (0, 100)]
      box2 = [(50, 50), (100, 50), (100, 100), (50, 100)]
      assert keras_ocr.evaluation.iou_score(box1, box2) == 0.25
  
      box2 = [(100, 100), (200, 100), (200, 200), (100, 200)]
      assert keras_ocr.evaluation.iou_score(box1, box2) == 0.0
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_iou_score() without return types