Struct GiniIndex 

pub struct GiniIndex;

Lowest weighted Gini impurity of the children first.

Trait Implementations

impl Default for GiniIndex

fn default() -> GiniIndex

Returns the “default value” for a type.

impl Heuristic for GiniIndex

fn compute(&self, cover: &mut Cover, candidates: &mut Vec<usize>) -> Vec<f64>

Sorts candidates best first and returns their scores in the same order (empty when the heuristic does not score).

fn compute_with_scorer( &self, parent_entropy: f64, cover: &mut Cover, candidates: &mut Vec<usize>, scorer: Box<dyn Fn(&[usize], &[usize], &[usize], f64) -> f64>, lower_is_better: bool, ) -> Vec<f64>

Scores each candidate with scorer and sorts them, ascending when lower_is_better and descending otherwise.