GPU support

[BradKML]

If this model is fast, then would including the usage of GPU makes the speed even faster (for larger datasets)? Think LightGBM does have GPU support https://lightgbm.readthedocs.io/en/latest/GPU-Tutorial.html
The only problem I can see with this arrangement, would be that it is written in Rust, so the low-level stuff and the GPU stuff might mingle more oddly

[deadsoul44]

GPU programming requires specific libraries. I don't have that expertise, but I'm happy to help with algorithm details if someone wants to tackle the GPU implementation.