Enum KernelPcaError 

pub enum KernelPcaError {
    NotFitted(String),
    InvalidInput(String),
    EigendecompositionFailed(String),
    DimensionMismatch {
        expected: usize,
        got: usize,
        context: String,
    },
    InsufficientComponents {
        requested: usize,
        available: usize,
    },
}

Failure modes for crate::kernel_pca::KernelPCA and friends.

Variants are deliberately coarse — one variant per kind of failure — and each carries a String message that names the offending argument. The five variants listed below match the v0.2.0 research-preview contract.

Variants

NotFitted(String)

Operation was requested against a model that has not been fitted yet (e.g. transform before fit).

InvalidInput(String)

Input violates an invariant of the Kernel PCA API — empty training set, zero-dimensional feature vector, n_components = 0 requested, etc.

EigendecompositionFailed(String)

The underlying symmetric eigensolver refused the problem or failed numerically. The inner String is the message reported by the solver.

DimensionMismatch

Vector or matrix supplied to transform has a different feature dimension than the data used at fit time.

Fields

expected: usize

Feature dimension that was recorded at fit time.

got: usize

Feature dimension that was supplied at transform time.

context: String

Human-readable description of where the mismatch occurred.

InsufficientComponents

The eigendecomposition produced fewer positive eigenvalues than the number of components requested by the caller — i.e. the kernel matrix is effectively low-rank and the requested KPCA embedding dimension is unreachable.

Fields

requested: usize

n_components passed to the config.

available: usize

Number of eigenvalues above the positivity threshold.

Trait Implementations

impl Debug for KernelPcaError

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

Formats the value using the given formatter.

impl Display for KernelPcaError

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

Formats the value using the given formatter.

impl Error for KernelPcaError

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.