Struct GroupKFold 

pub struct GroupKFold { /* private fields */ }

Group K-Fold cross-validator with custom group definitions

Ensures that samples from the same group are not in both training and test sets. Supports custom grouping strategies for advanced use cases.

Implementations

impl GroupKFold

pub fn new(n_splits: usize) -> Self

Create a new GroupKFold cross-validator with direct grouping strategy

pub fn new_balanced(n_splits: usize) -> Self

Create a GroupKFold with balanced group distribution strategy

pub fn new_size_aware(n_splits: usize, max_group_size: usize) -> Self

Create a GroupKFold with size-aware group distribution strategy

pub fn group_strategy(self, strategy: GroupStrategy) -> Self

Set the group strategy

pub fn split_with_groups( &self, n_samples: usize, groups: &Array1<i32>, ) -> Vec<(Vec<usize>, Vec<usize>)>

Split based on groups using the configured strategy to ensure no leakage

Trait Implementations

impl Clone for GroupKFold

fn clone(&self) -> GroupKFold

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl CrossValidator for GroupKFold

fn n_splits(&self) -> usize

Returns the number of splits

fn split( &self, n_samples: usize, y: Option<&Array1<i32>>, ) -> Vec<(Vec<usize>, Vec<usize>)>

Generate train/test indices for cross-validation

impl Debug for GroupKFold

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

Formats the value using the given formatter.