yolov3-pytroch: Calculate the gradient value directly like Darknet. coco2017 val,608x608 map IOU area maxDets yolov3 paper this impl Average Precision (AP) IoU=0.50:0.95 all 100 0.33 0.343 Average Precision (AP) IoU=0.50 all 100 0.579 0.572 Average Precision (AP) IoU=0.75 all 100 0.344 0.365 Average Precision (AP) IoU=0.50:0.95 small 100 0.183 0.181 Average Precision (AP) IoU=0.50:0.95 medium 100 0.354 0.377 Average Precision (AP) IoU=0.50:0.95 large 100 0.419 0.451 coco2017 val,416x416 map IOU area maxDets this impl Average Precision (AP) IoU=0.50:0.95 all 100 0.321 Average Precision (AP) IoU=0.50 all 100 0.541 Average Precision (AP) IoU=0.75 all 100 0.335 Average Precision (AP) IoU=0.50:0.95 small 100 0.140 Average Precision (AP) IoU=0.50:0.95 medium 100 0.349 Average Precision (AP) IoU=0.50:0.95 large 100 0.478