yolov5_all 可以训练yolov5(v6.0)、yolox、小型网络，添加注意力机制 Reference https://github.com/ultralytics/yolov5 https://github.com/Tencent/ncnn https://github.com/Megvii-BaseDetection/YOLOX https://github.com/ppogg/YOLOv5-Lite