Enum RffKernel 

#[non_exhaustive]
pub enum RffKernel {
    Gaussian {
        length_scale: f64,
    },
    Laplacian {
        length_scale: f64,
    },
    Matern32 {
        length_scale: f64,
    },
    Matern52 {
        length_scale: f64,
    },
}

Shift-invariant kernel type for Random Fourier Feature approximation.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Gaussian

Gaussian (RBF) kernel: K(x,y) = exp(-||x-y||²/(2l²)). Spectral density: p(ω) = N(0, I/l²).

Fields

length_scale: f64

Length-scale parameter l > 0.

Laplacian

Laplacian kernel: K(x,y) = exp(-||x-y||₁/l). Spectral density: product of Cauchy distributions scaled by 1/l.

Fields

length_scale: f64

Length-scale parameter l > 0.

Matern32

Matérn 3/2 kernel. Spectral density: scaled Student-t with ν=3 degrees of freedom.

Fields

length_scale: f64

Length-scale parameter l > 0.

Matern52

Matérn 5/2 kernel. Spectral density: scaled Student-t with ν=5 degrees of freedom.

Fields

length_scale: f64

Length-scale parameter l > 0.

Implementations

impl RffKernel

pub fn length_scale(&self) -> f64

Length-scale for this kernel variant.

Trait Implementations

impl Clone for RffKernel

fn clone(&self) -> RffKernel

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RffKernel

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

Formats the value using the given formatter.

impl PartialEq for RffKernel

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for RffKernel