ROS Noetic + YOLOV4 (Darknet by AlexeyAB) + CUDNN + CUDNN_HALF

[wmoralesap]

Hello I am a student at Johannes Kepler University.

I wanted to use YOLOV4 with darknet_ros and OpenCV4 on ROS Noetic, so I had to change to AlexeyAB's Darknet with the help of #319.

I couldn't find any available implementation. I hope this helps practitioners.

Main Changes

• Support for YOLOV4 on ROS Noetic Changed to Darknet by Alexey AB
• Support for OpenCV4
• CuDNN supported
• Automatic recognition of CUDA architectures

[adivardi]

Any updates from maintainers? darknet_ros is stuck at YoloV3, this PR should help move to the Alexey AB branch which already supports YoloV7.