YOLOv4: Optimal Speed and Accuracy of Object Detection
The original author of YOLO stopped working on it[1]. Alexey Bochkovskiy, aka AlexeyAB, created a fork on GitHub and wrote an extensive guide to customizing YOLO's network architecture, added new features, and has answered zillions of questions.1: https://twitter.com/pjreddie/status/1230524770350817280