Enum ModelSelectionError 

pub enum ModelSelectionError {
    NotEnoughSamples {
        needed: usize,
        got: usize,
    },
    EmptyClass,
    EmptyGroup,
    InvalidSplitCount {
        msg: String,
    },
    InsufficientTrainWindow {
        msg: String,
    },
    ShapeMismatch {
        expected: usize,
        got: usize,
    },
}

Errors returned by splitters and evaluation utilities.

The library follows a deliberate policy on degenerate inputs (mirroring the convention used across the sibling imbalance-rs crate):

• Warn and adjust where a sane fallback exists — e.g. a StratifiedKFold class smaller than n_splits is distributed across as many folds as it can fill, with a warning on stderr, rather than aborting the whole split.
• Hard-error where there is no meaningful fallback — e.g. a TimeSeriesSplit asked for more splits than the data can supply a valid train/test window for.

Variants

NotEnoughSamples

Fewer samples than are needed to form the requested splits.

Fields

needed: usize

Minimum number of samples the configuration requires.

got: usize

Number of samples actually supplied.

EmptyClass

A class label had no samples where at least one was required.

EmptyGroup

A group had no samples where at least one was required.

InvalidSplitCount

The requested number of splits is invalid (must be >= 2, and no larger than the number of samples / groups the splitter partitions over).

Fields

msg: String

Human-readable explanation of why the count is invalid.

InsufficientTrainWindow

TimeSeriesSplit could not carve out a training window large enough for every requested split.

Fields

msg: String

Human-readable explanation of the shortfall.

ShapeMismatch

Two inputs that had to agree on length did not (e.g. a stored label array whose length differs from n_samples passed to split).

Fields

expected: usize

Length that was expected.

got: usize

Length that was supplied.

Trait Implementations

impl Clone for ModelSelectionError

fn clone(&self) -> ModelSelectionError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ModelSelectionError

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

Formats the value using the given formatter.

impl Display for ModelSelectionError

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

Formats the value using the given formatter.

impl Eq for ModelSelectionError

impl Error for ModelSelectionError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl PartialEq for ModelSelectionError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ModelSelectionError