* Package name    : nvidia-cub
  Version         : x.y.z
  Upstream Author : nvidia
* URL             : https://nvlabs.github.io/cub/
* License         : BSD-3-Clause
  Programming Lang: cuda, c++
  Description     : cooperative threadblock primitives and other
utilities for CUDA kernel programming

I've seen this many times in different projects e.g.
https://github.com/tensorflow/tensorflow/tree/master/third_party
https://github.com/pytorch/pytorch/tree/master/third_party
https://github.com/mitsuba-renderer/enoki

It's a sensible candidate to be packaged. The source code
is free but it depends on cuda so the resulting package
has to enter contrib.