YoloV3 Confidence Loss (Object/No Object Loss) Explaination

Hello @pjreddie @AlexeyAB , at first, thank you for giving us YOLO, great work. I had a question regarding the YOLOv3 confidence loss function, I read the paper and found that the confidence loss was not explained very well, can you please explain it more elaborately? I am confused with the part where you are using the threshold to create a ignore mask, how does that part work? Also, please tag the issue if someone has already raised this question in issues.