Struct rusty_machine::learning::toolkit::kernel::RationalQuadratic

pub struct RationalQuadratic {
    pub alpha: f64,
    pub ls: f64,
}

The Rational Quadratic Kernel.

k(x,y) = (1 + ||x-y||² / (2αl²))^-α

Fields

alpha: f64

Controls inverse power and difference scale.

ls: f64

Length scale controls scale of difference.

Implementations

impl RationalQuadratic

pub fn new(alpha: f64, ls: f64) -> RationalQuadratic

Constructs a new Rational Quadratic Kernel.

Examples

use rusty_machine::learning::toolkit::kernel;
use rusty_machine::learning::toolkit::kernel::Kernel;

// Construct a kernel with alpha = 2, ls = 2.
let ker = kernel::RationalQuadratic::new(2.0, 2.0);

println!("{0}", ker.kernel(&[1.,2.,3.], &[3.,4.,5.]));

Trait Implementations

impl Clone for RationalQuadratic

fn clone(&self) -> RationalQuadratic

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for RationalQuadratic

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

Formats the value using the given formatter.

impl Default for RationalQuadratic

The default Rational Qaudratic Kernel.

The defaults are:

• alpha = 1
• ls = 1

fn default() -> RationalQuadratic

Returns the “default value” for a type.

impl Kernel for RationalQuadratic

fn kernel(&self, x1: &[f64], x2: &[f64]) -> f64

The kernel function.

impl Copy for RationalQuadratic