Struct FeatureSplit 

pub struct FeatureSplit {
    pub feature_idx: usize,
    pub threshold: f64,
    pub impurity_reduction: f64,
    pub n_left: usize,
    pub n_right: usize,
    pub information_gain: Option<f64>,
}

Parallel feature evaluation for tree construction

Fields

feature_idx: usize

Feature index

threshold: f64

Best threshold for this feature

impurity_reduction: f64

Impurity reduction achieved by this split

n_left: usize

Number of samples that would go left

n_right: usize

Number of samples that would go right

information_gain: Option<f64>

Information gain (for classification)

Implementations

impl FeatureSplit

pub fn new( feature_idx: usize, threshold: f64, impurity_reduction: f64, n_left: usize, n_right: usize, ) -> Self

Create a new feature split

pub fn with_information_gain(self, gain: f64) -> Self

Set information gain for classification

pub fn is_valid(&self) -> bool

Check if this split is valid (has samples on both sides)

pub fn quality_score(&self) -> f64

Get the split quality score

Trait Implementations

impl Clone for FeatureSplit

fn clone(&self) -> FeatureSplit

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for FeatureSplit

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.