Why is there no result with tiny-yolov3 prediction？Found 0 boxes for img为什么tiny-yolov3训练好之后，无法预测任何结果？一个boundingbox都出不来

After training the yolov3 network, the prediction is normal.but when training the tiny-yolov3,there was no bounding boxes.Everything follows the training steps. I successfully trained tiny-yolov3 for the first time and predicted the result, but this time it won’t work.