Enum NestedCvSpec 

pub enum NestedCvSpec {
    KFold(KFoldSpec),
    GroupKFold(GroupKFoldSpec),
}

Inner (nested) cross-validation policy.

Declared globally on the CampaignSpec and/or locally on a NodePlan (e.g. a finetune/tuner or branch node); the local policy overrides the global default (see resolve_inner_cv). dag-ml builds the inner FoldSet from each outer fold’s training samples via NestedCvSpec::build_inner_fold_set, so the inner folds are a subset of outer-train by construction — nested CV cannot leak outer-validation rows into inner tuning.

Variants

KFold(KFoldSpec)

Index-based inner K-fold, built in-core from outer-train samples.

GroupKFold(GroupKFoldSpec)

Group-aware inner K-fold, built in-core from outer-train sample groups.

Implementations

impl NestedCvSpec

pub fn validate(&self) -> Result<(), DagMlError>

Validate the nested-CV policy’s parameters independently of any outer fold. Mirrors the checks the splitters enforce (n_splits >= 2) so a malformed declaration is rejected at plan time rather than deferred to FIT_CV.

pub fn build_inner_fold_set( &self, outer: &FoldAssignment, outer_groups: &BTreeMap<SampleId, GroupId>, ) -> Result<FoldSet, DagMlError>

Build the inner FoldSet for one outer fold from its training samples only. outer_groups is the outer FoldSet.sample_groups (used by GroupKFold; ignored otherwise). The result is validated to lie entirely within the outer fold’s training set.

Trait Implementations

impl Clone for NestedCvSpec

fn clone(&self) -> NestedCvSpec

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for NestedCvSpec

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for NestedCvSpec

fn deserialize<__D>( __deserializer: __D, ) -> Result<NestedCvSpec, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for NestedCvSpec

impl PartialEq for NestedCvSpec

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for NestedCvSpec

fn serialize<__S>( &self, __serializer: __S, ) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for NestedCvSpec