Darknet is an open source neural network framework written in C and CUDA. It is fast, easy to install, and supports CPU and GPU computation.
Yolo v4 paper: https://arxiv.org/abs/2004.10934
Yolo v4 source code: https://github.com/AlexeyAB/darknet
For more information see the Darknet project website.
For questions or issues please use the Google Group.