I want to modify the yolov8 example to yolov5

[EHW-liao]

I would like to write a model of yolov5 following the example of yolov8 in the candle framework. In addition to amending the model.rs document, is there anything else that needs to be modified?
In addition, the weight file format of the Yolov5 model is *.pt, please ask if Candle supports reading the PT format.