Function keep_min_k_values

pointersect/pr/cuda/pr_cuda.cpp:550–559

torch::Tensor keep_min_k_values(
        torch::Tensor values,  // (b, n), float
        int64_t k
) {
//    return values;
    return keep_min_k_values_cuda(
        values,  // (b, n,
        k
    );
}


// Find the k nearest points within `radius` of a ray, ie, the vertical distance from the point to ray <= radius.