It would be nice if a cuda implementation of AKAZE could be added.

According to the comment on the src/aliceVision/feature/akaze/AKAZE.hpp, the implementation is taken from pablofdezalc/akaze.

going to that page, they list the following under an "other implementations" header:

You can try the CUDA A-KAZE implementation from Niklas Bergström: nbergst/akaze

There is also a very fast CPU A-KAZE version from Hideaki Suzuki h2suzuki/fast_akaze

Since those are all licensed under a BSD-3-Clause license, would it perhaps be possible to get the cuda version (and possible the "fast cpu" version) added to alicevision?