Package de.uni_trier.wi2.procake.similarity.base.numeric.impl

Class SMNumericSigmoidImpl

java.lang.Object

de.uni_trier.wi2.procake.similarity.impl.SimilarityMeasureImpl

de.uni_trier.wi2.procake.similarity.base.numeric.impl.SMNumericImpl

de.uni_trier.wi2.procake.similarity.base.numeric.impl.SMNumericSigmoidImpl

All Implemented Interfaces:

SMNumeric, SMNumericSigmoid, SimilarityMeasure

public class SMNumericSigmoidImpl
extends SMNumericImpl
implements SMNumericSigmoid

Author:

rmaximi

Nested Class Summary

Nested classes/interfaces inherited from interface de.uni_trier.wi2.procake.similarity.base.numeric.SMNumeric

SMNumeric.ZERO_OUT_STRATEGIES

Field Summary

Fields inherited from interface de.uni_trier.wi2.procake.similarity.SimilarityMeasure

LOG_ORDER_NAME_NOT_FOUND

Fields inherited from interface de.uni_trier.wi2.procake.similarity.base.numeric.SMNumeric

DEFAULT_STRATEGY

Fields inherited from interface de.uni_trier.wi2.procake.similarity.base.numeric.SMNumericSigmoid

DEFAULT_ALPHA, DEFAULT_THETA, NAME

Constructor Summary

Constructors

Constructor	Description
SMNumericSigmoidImpl()

Method Summary

Modifier and Type	Method	Description
Similarity	compute(DataObject queryObject, DataObject caseObject, SimilarityValuator valuator)	f(d) = \frac{1}{e^{\frac{d-\theta}{\alpha}}+1}
double	getAlpha()
String	getSystemName()	The system name can be used to distinguish the similarity measures.
double	getTheta()
void	setAlpha(double alpha)	Alpha is necessary for sigmoid function.
void	setTheta(double theta)	Theta is necessary for the sigmoid function.

Methods inherited from class de.uni_trier.wi2.procake.similarity.base.numeric.impl.SMNumericImpl

applyAsymmetricSituation, getAsymmetricStrategy, getAtomicClass, isSimilarityFor, setAsymmetricStrategy

Methods inherited from class de.uni_trier.wi2.procake.similarity.impl.SimilarityMeasureImpl

getDataClass, getName, initialize, initializeBasedOn, isAggregate, isForceOverride, isInterval, isNumeric, isObject, isReusable, isSet, isTable, isTaxonomy, isText, setDataClass, setForceOverride, setName, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface de.uni_trier.wi2.procake.similarity.SimilarityMeasure

getDataClass, getName, isForceOverride, isReusable, setForceOverride

Methods inherited from interface de.uni_trier.wi2.procake.similarity.base.numeric.SMNumeric

getAsymmetricStrategy, setAsymmetricStrategy

Constructor Details

SMNumericSigmoidImpl

public SMNumericSigmoidImpl()

Method Details

compute

public Similarity compute(DataObject queryObject,
 DataObject caseObject,
 SimilarityValuator valuator)

 f(d) = \frac{1}{e^{\frac{d-\theta}{\alpha}}+1}
 

Specified by:

compute in interface SimilarityMeasure

Parameters:

queryObject -

caseObject -

Returns:

a similarity value

getAlpha

public double getAlpha()

Specified by:

getAlpha in interface SMNumericSigmoid

setAlpha

public void setAlpha(double alpha)

Description copied from interface: SMNumericSigmoid

Alpha is necessary for sigmoid function. Alpha should be very small, e.g., 0.1 or 0.01.

Specified by:

setAlpha in interface SMNumericSigmoid

Parameters:

alpha - must be greater zero

getSystemName

public String getSystemName()

Description copied from interface: SimilarityMeasure

The system name can be used to distinguish the similarity measures. Each similarity measure that can be instantiated contains a static final field called NAME representing the system name, e.g., SMAggregateEuclidian.NAME

The system name must also be given during initialization, see SimilarityModel.createSimilarityMeasure(String, DataClass).

Specified by:

getSystemName in interface SimilarityMeasure

Returns:

The system name of the similarity measure. This is equal to SimilarityMeasure.NAME.

getTheta

public double getTheta()

Specified by:

getTheta in interface SMNumericSigmoid

setTheta

public void setTheta(double theta)

Description copied from interface: SMNumericSigmoid

Theta is necessary for the sigmoid function. Theta must be between 0 an 1.

Specified by:

setTheta in interface SMNumericSigmoid

Parameters:

theta - must be greater zero