smile.math.kernel

Class SparsePolynomialKernel

java.lang.Object

smile.math.kernel.SparsePolynomialKernel

All Implemented Interfaces:

MercerKernel<SparseArray>

public class SparsePolynomialKernel
extends Object
implements MercerKernel<SparseArray>

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

Method Summary

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

Methods inherited from class java.lang.Object

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

Constructor Detail

SparsePolynomialKernel

public SparsePolynomialKernel(int degree)

Constructor with scale 1 and bias 0.

SparsePolynomialKernel

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

Constructor.

Method Detail

toString

public String toString()

Overrides:

toString in class Object

k

public double k(SparseArray x,
                SparseArray y)

Description copied from interface: MercerKernel

Kernel function.

Specified by:

k in interface MercerKernel<SparseArray>