smile.math.kernel

Class BinarySparseGaussianKernel

java.lang.Object

smile.math.kernel.BinarySparseGaussianKernel

All Implemented Interfaces:

java.io.Serializable, MercerKernel<int[]>

public class BinarySparseGaussianKernel
extends java.lang.Object
implements MercerKernel<int[]>, java.io.Serializable

The Gaussian Mercer Kernel. k(u, v) = e^{-||u-v||2 / (2 * σ2)}, where σ > 0 is the scale parameter of the kernel. The kernel works on sparse binary array as int[], which are the indices of nonzero elements.

The Gaussian kernel is a good choice for a great deal of applications, although sometimes it is remarked as being overused.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
BinarySparseGaussianKernel(double sigma) Constructor.

Method Summary

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

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

BinarySparseGaussianKernel

public BinarySparseGaussianKernel(double sigma)

Constructor.

Parameters:

sigma - the smooth/width parameter of Gaussian kernel.

Method Detail

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

k

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

Description copied from interface: MercerKernel

Kernel function.

Specified by:

k in interface MercerKernel<int[]>