de.aitools.ir.retrievalmodels.representer
Class LatentSemanticIndexing

java.lang.Object
  de.aitools.ir.retrievalmodels.representer.AbstractRepresenter<java.lang.String,Vector>
      de.aitools.ir.retrievalmodels.representer.LatentSemanticIndexing

All Implemented Interfaces:

Representer<java.lang.String,Vector>, java.io.Serializable

public class LatentSemanticIndexing
extends AbstractRepresenter<java.lang.String,Vector>

Latent Semantic Indexing

 References:
 
 Indexing by Latent Semantic Analysis , by Deerwester et al., 1990.
 

Version:

aitools 3.0 Created on Apr 21, 2010 $Id: LSI.java,v 1.1 2010/04/21 16:24:29 hoppe Exp $

Author:

dennis.hoppe@uni-weimar.de

See Also:

Serialized Form

Nested Class Summary

class	LatentSemanticIndexing.DynamicReductionStrategyImpl Reduces the dimension of the matrix depending on the number of training documents.
class	LatentSemanticIndexing.FixedReductionStrategyImpl Reduces the matrix to the given rank.
class	LatentSemanticIndexing.QualityReductionStrategyImpl Reduces the matrix dynamically to the lowest rank that satisfies the given quality.

Constructor Summary

LatentSemanticIndexing(java.util.Locale locale)

LatentSemanticIndexing(java.util.Locale locale, double quality)

LatentSemanticIndexing(java.util.Locale locale, int desiredDimension)

LatentSemanticIndexing(Representer<java.lang.String,Vector> representer)

Method Summary

Jama.Matrix	getD_k()
Jama.Matrix	getD()
int	getRank()
Representer<java.lang.String,Vector>	getRepresenter()
Jama.Matrix	getS_k()
Jama.Matrix	getS()
Jama.SingularValueDecomposition	getSvd()
Jama.Matrix	getT_k()
Jama.Matrix	getT()
int	getVocabularySize()
boolean	isReduced()
boolean	isTrained()
Vector	represent(java.lang.String text)
void	setStrategy(de.aitools.ir.retrievalmodels.representer.LatentSemanticIndexing.IReductionStrategy strategy)
void	train(java.lang.Iterable<java.lang.String> texts, boolean forceTraining)

Methods inherited from class de.aitools.ir.retrievalmodels.representer.AbstractRepresenter

train

Methods inherited from class java.lang.Object

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

Constructor Detail

LatentSemanticIndexing

public LatentSemanticIndexing(java.util.Locale locale)

Parameters:

locale -

LatentSemanticIndexing

public LatentSemanticIndexing(java.util.Locale locale,
                              int desiredDimension)

Parameters:

locale - language information used by the internal Representer

desiredDimension - specifies the new rank of the LSI matrix. If desiredDimension is greater than the actual rank of the matrix, the matrix remains unchanged.

LatentSemanticIndexing

public LatentSemanticIndexing(java.util.Locale locale,
                              double quality)

Parameters:

locale - language information used for stemming et cetera

quality - specifies the quality by which the original matrix will be approximated.

LatentSemanticIndexing

public LatentSemanticIndexing(Representer<java.lang.String,Vector> representer)

Parameters:

representer -

strategy -

Method Detail

setStrategy

public void setStrategy(de.aitools.ir.retrievalmodels.representer.LatentSemanticIndexing.IReductionStrategy strategy)

Parameters:

strategy -

represent

public Vector represent(java.lang.String text)

train

public void train(java.lang.Iterable<java.lang.String> texts,
                  boolean forceTraining)

isTrained

public final boolean isTrained()

Returns:

the isTrained

isReduced

public boolean isReduced()

Returns:

getSvd

public final Jama.SingularValueDecomposition getSvd()

Returns:

the svd

getT

public final Jama.Matrix getT()

Returns:

the t

getT_k

public final Jama.Matrix getT_k()

Returns:

the t_k

getS

public final Jama.Matrix getS()

Returns:

the s

getS_k

public final Jama.Matrix getS_k()

Returns:

the s_k

getD

public final Jama.Matrix getD()

Returns:

the d

getD_k

public final Jama.Matrix getD_k()

Returns:

the d_k

getRank

public final int getRank()

Returns:

getVocabularySize

public final int getVocabularySize()

Returns:

getRepresenter

public Representer<java.lang.String,Vector> getRepresenter()

Returns: