The MOT tutorial does not output label for detection results

[FCInter]

I'm running the tutorial. It works but I cannot get the predicted label for each box. I can only get the object_id, bbox, and confidence score in the tracking result, and only the bbox and confidence score in the detection result.

I also get the warning which says "Warning: The model doesn't have classes", just like what is shown in the tutorial.

I really need to get the predicted label for each detection. It's weird for a tracking model not providing the label.

How shall I fix this problem?

I'm looking forward to anyone's kind help. Thanks!!!