Question: Must the number of points per input be known at compile time?

[NnannaOmoke]

This means that you cannot build a KdTree from a vector of vectors/slices, which severely limits the functionality to use cases where the dimensions of the input are hard coded in.

[NnannaOmoke]

i.e. something like this would not work:

let tree = points.rows().into_iter().map(|row| row.to_vec()).collect::<Vec<Vec<f64>>>();
//assume that points is an `ndarray`
let tree = KdTree<f64, 2> = (&tree).into();

Even though this is a very points agnostic way of creating KdTrees

[sdd]

Unfortunately yes, Kiddo does not support creating trees whose dimensionality is not known at compile time. This is due to the use of arrays rather than Vecs for performance.