Feature request:Add new index type to use gpu to accelerate the vector indexing process

[zhcn000000]

Is it possible to add new index type to use gpu to accelerate the vector indexing and searching process like gpu_ivfflat_index just like pg-strom accelerate scan by gpu
from https://developer.nvidia.com/blog/accelerated-vector-search-approximating-with-nvidia-cuvs-ivf-flat/