de.lmu.ifi.dbs.elki.distance.similarityfunction.kernel

Class LaplaceKernelFunction

java.lang.Object

de.lmu.ifi.dbs.elki.distance.similarityfunction.AbstractVectorSimilarityFunction

de.lmu.ifi.dbs.elki.distance.similarityfunction.kernel.LaplaceKernelFunction

All Implemented Interfaces:

PrimitiveSimilarityFunction<NumberVector>, SimilarityFunction<NumberVector>

public class LaplaceKernelFunction
extends AbstractVectorSimilarityFunction

Laplace / exponential radial basis function kernel.

Since:

0.6.0

Author:

Erich Schubert

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	LaplaceKernelFunction.Parameterizer Parameterization class.

Field Summary

Fields

Modifier and Type	Field and Description
private double	mgamma Scaling factor mgamma. (= - 1/sigma)

Constructor Summary

Constructors

Constructor and Description
LaplaceKernelFunction(double sigma) Constructor.

Method Summary

Modifier and Type	Method and Description
double	similarity(NumberVector o1, NumberVector o2) Computes the similarity between two given DatabaseObjects according to this similarity function.

Methods inherited from class de.lmu.ifi.dbs.elki.distance.similarityfunction.AbstractVectorSimilarityFunction

getInputTypeRestriction

Methods inherited from class java.lang.Object

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

Methods inherited from interface de.lmu.ifi.dbs.elki.distance.similarityfunction.PrimitiveSimilarityFunction

instantiate

Methods inherited from interface de.lmu.ifi.dbs.elki.distance.similarityfunction.SimilarityFunction

isSymmetric

Field Detail

mgamma

private final double mgamma

Scaling factor mgamma. (= - 1/sigma)

Constructor Detail

LaplaceKernelFunction

public LaplaceKernelFunction(double sigma)

Constructor.

Parameters:

sigma - Scaling parameter sigma (as in laplace kernel)

Method Detail

similarity

public double similarity(NumberVector o1,
                         NumberVector o2)

Description copied from interface: PrimitiveSimilarityFunction

Computes the similarity between two given DatabaseObjects according to this similarity function.

Parameters:

o1 - first DatabaseObject

o2 - second DatabaseObject

Returns:

the similarity between two given DatabaseObjects according to this similarity function