Yeah, they made the most popular PyTorch implementation of YOLOv3 as well so they're not entering out of the blue, though. https://github.com/ultralytics/yolov3

The author of YOLOv3 quit working on Computer Vision due to ethical concerns. YOLOv4, which built on his work in v3, was released by different authors last month. I'd expect more YOLOvX's from different authors in the future. https://twitter.com/pjreddie/status/1230524770350817280

I'm a bit fascinated by this Ultralytics. It has super nice website but according to LinkedIn, I think it's just one guy who does consultancy.

The intriguing part is that he has also done research in particle physics (as Ulatrlytics) that has been published in Nature [1].

I had never seen anything like that.

[1] https://www.nature.com/articles/srep13945