Most YOLO family, e.g. YOLOv3, YOLOv4, YOLOv5 and YOLOv7, are anchor based detectors. The performance are optimised for anchor based framework. However the predefined anchor size, as a strong prior, may limits the detection performance. YOLOX is based on YOLOv3-SPP with DarkNet53 backbone and an SPP layer. Apart from make…