what about the speed and mAP vs yolov3

@HiKapok  hi, have you ever try to  train on COCO ? can the model be as good as the paper result (we can find its' mAP is close to yolov3, but 3 times fps to yolov2).  Recently, I want to do human head detection, i want to use light-head-rcnn, can you give some advices? I am new in  deep learning,thank you.