Function ordist::distances::spearman_dist

pub fn spearman_dist<K: OrDistElement>(
    v1: &[K], 
    v2: &[K]
) -> Result<usize, OrDistError<K>>

Spearman distance between 2 orders.

d_{Spear}(x,y) = \sum_{i=1}^{n}(r_{xi}-r_{yi})^{2}

r_{xi} is the rank in x of element i.