Struct Ebm 

pub struct Ebm { /* private fields */ }

The settings of an explainable boosting machine (booster = ebm; see crate::ebm). Build with Ebm::builder; the defaults are one bag of every row, main effects only, no early stopping, and the classic cyclic EBM.

use std::num::NonZeroUsize;

use hessboost::config::{Ebm, EbmEarlyStopping};

let stopping = EbmEarlyStopping::new(
    NonZeroUsize::new(50).unwrap(),
    EbmEarlyStopping::DEFAULT_TOLERANCE,
)?;
let ebm = Ebm::builder()
    .interactions(2)
    .outer_bags(8)
    .bag_fraction(0.85)
    .early_stopping(stopping)
    .build()?;
assert_eq!((ebm.interactions(), ebm.outer_bags()), (2, 8));
assert_eq!(ebm.early_stopping(), Some(stopping));
// Early stopping scores each bag on the rows it does not train on.
assert!(Ebm::builder().early_stopping(stopping).build().is_err());

Implementations

impl Ebm

pub fn builder() -> EbmBuilder

Start a builder at the defaults.

pub fn interactions(&self) -> usize

Number of pairwise interaction terms added after the main effects: the top pairs by FAST (Lou et al., KDD 2013) on the main-effect model’s gradients, each boosted like a main effect on its two features. At most n_features (n_features − 1) / 2 (checked at training). ebm_interactions.

pub fn outer_bags(&self) -> usize

Outer bags (InterpretML’s outer_bags): each bag boosts its own copy of every term on its own row sample, and the model averages them. ebm_outer_bags.

pub fn bag_fraction(&self) -> f64

Fraction of the rows each outer bag trains on, drawn without replacement per bag (InterpretML trains each bag on 1 − validation_size = 0.85). ebm_bag_fraction.

pub fn boulevard(&self) -> bool

Boulevard-regularized EBM (Fang, Tan, Pipping & Hooker, AISTATS 2026, Algorithm 1): every round fits one tree per term to the same residuals, centers it, and averages it into its term with learning rate eta ∈ (0, 1], so the terms converge to a feature-wise kernel ridge regression with confidence bands (EbmInference). Squared error only, with Boulevard’s refusals, one bag of every row, and no early stopping. ebm_boulevard.

pub fn early_stopping(&self) -> Option<EbmEarlyStopping>

Per-bag early stopping of a classic EBM (EbmEarlyStopping), None for none.

Trait Implementations

impl Clone for Ebm

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Ebm

impl Debug for Ebm

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

Formats the value using the given formatter.

impl Default for Ebm

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for Ebm

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Ebm