smile.math.kernel

Class BinarySparsePolynomialKernel

java.lang.Object

smile.math.kernel.BinarySparsePolynomialKernel

All Implemented Interfaces:

MercerKernel<int[]>

public class BinarySparsePolynomialKernel
extends Object
implements MercerKernel<int[]>

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. The kernel works on sparse binary array as int[], which are the indices of nonzero elements.

Author:

Haifeng Li

Constructor Summary

Constructors

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

Method Summary

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

Methods inherited from class java.lang.Object

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

Constructor Detail

BinarySparsePolynomialKernel

public BinarySparsePolynomialKernel(int degree)

Constructor with scale 1 and bias 0.

BinarySparsePolynomialKernel

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

Constructor.

Method Detail

toString

public String toString()

Overrides:

toString in class Object

k

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

Description copied from interface: MercerKernel

Kernel function.

Specified by:

k in interface MercerKernel<int[]>