Function grappes::kmeans::kmeans_random_part_with_centroids

pub fn kmeans_random_part_with_centroids<R: Rng>(
    rng: &mut R, 
    points: &Array<f32, Ix2>, 
    k: usize
) -> (Array<usize, Ix1>, Array<f32, Ix2>)

KMeans algorithm with random partition initialization