Add parameter default value.

app.py

@@ -88,7 +88,7 @@ def visualize(image_path, boxes, txts, scores,
  return image_save
 
 
-def inference(img_path, box_thresh, unclip_ratio, text_score):
+def inference(img_path, box_thresh=0.5, unclip_ratio=1.6, text_score=0.5):
  img = cv2.imread(img_path)
  ocr_result, _ = rapid_ocr(img, box_thresh=box_thresh,
  unclip_ratio=unclip_ratio,