smile.math.kernel

Class PolynomialKernel

java.lang.Object

smile.math.kernel.PolynomialKernel

All Implemented Interfaces:

MercerKernel<double[]>

public class PolynomialKernel
extends Object
implements MercerKernel<double[]>

The polynomial kernel. k(u, v) = (γ u^Tv - λ)^d, where γ is the scale of the used inner product, λ the offset of the used inner product, and d the order of the polynomial kernel.

Author:

Haifeng Li

Constructor Summary

Constructors

Constructor and Description
PolynomialKernel(int degree) Constructor with scale 1 and bias 0.
PolynomialKernel(int degree, double scale, double offset) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
double	k(double[] x, double[] y) Kernel function.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

PolynomialKernel

public PolynomialKernel(int degree)

Constructor with scale 1 and bias 0.

PolynomialKernel

public PolynomialKernel(int degree,
                double scale,
                double offset)

Constructor.

Method Detail

toString

public String toString()

Overrides:

toString in class Object

k

public double k(double[] x,
       double[] y)

Description copied from interface: MercerKernel

Kernel function.

Specified by:

k in interface MercerKernel<double[]>