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

Class Kulczynski2SimilarityFunction

java.lang.Object

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

de.lmu.ifi.dbs.elki.distance.similarityfunction.Kulczynski2SimilarityFunction

All Implemented Interfaces:

PrimitiveSimilarityFunction<NumberVector>, SimilarityFunction<NumberVector>

@Reference(authors="M.-M. Deza, E. Deza",
           title="Dictionary of distances",
           booktitle="Dictionary of distances",
           url="https://doi.org/10.1007/978-3-642-00234-2",
           bibkey="doi:10.1007/978-3-642-00234-2")
public class Kulczynski2SimilarityFunction
extends AbstractVectorSimilarityFunction

Kulczynski similarity 2.

\[ s_\text{Kulczynski-2}(\vec{x},\vec{y} := \tfrac{n}{2}\left(\tfrac{1}{\bar{x}}+\tfrac{1}{\bar{y}}\right) \sum\nolimits_i\min\{x_i,y_i\} \]

Reference:

M.-M. Deza and E. Deza
Dictionary of distances

TODO: add an optimized version for binary data.

Since:

0.6.0

Author:

Erich Schubert

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Kulczynski2SimilarityFunction.Parameterizer Parameterization class.

Field Summary

Fields

Modifier and Type	Field and Description
static Kulczynski2SimilarityFunction	STATIC_CONTINUOUS Static instance.

Constructor Summary

Constructors

Constructor and Description
Kulczynski2SimilarityFunction() Deprecated. Use STATIC_CONTINUOUS instance instead.

Method Summary

Modifier and Type	Method and Description
double	similarity(NumberVector v1, NumberVector v2) 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

STATIC_CONTINUOUS

public static final Kulczynski2SimilarityFunction STATIC_CONTINUOUS

Static instance.

Constructor Detail

Kulczynski2SimilarityFunction

@Deprecated
public Kulczynski2SimilarityFunction()

Deprecated. Use STATIC_CONTINUOUS instance instead.

Constructor.

Method Detail

similarity

public double similarity(NumberVector v1,
                         NumberVector v2)

Description copied from interface: PrimitiveSimilarityFunction

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

Parameters:

v1 - first DatabaseObject

v2 - second DatabaseObject

Returns:

the similarity between two given DatabaseObjects according to this similarity function