edu.ucla.sspace.matrix

Class LogEntropyTransform

java.lang.Object

edu.ucla.sspace.matrix.BaseTransform

edu.ucla.sspace.matrix.LogEntropyTransform

All Implemented Interfaces:

Transform

public class LogEntropyTransform
extends BaseTransform

Transforms a matrix using log-entropy weighting. The input matrix is assumed to be formatted as rows representing terms and columns representing documents. Each matrix cell indicates the number of times the row's word occurs within the column's document. See the following papers for details and analysis:

• Landauer, T. K., Foltz, P. W., & Laham, D. (1998). Introduction to Latent Semantic Analysis. Discourse Processes, 25, 259-284.
• S. Dumais, “Enhancing performance in latent semantic indexing (LSI) retrieval,” Bellcore, Morristown (now Telcordia Technologies), Tech. Rep. TM-ARH-017527, 1990.
• P. Nakov, A. Popova, and P. Mateev, “Weight functions impact on LSA performance,” in Proceedings of the EuroConference Recent Advances in Natural Language Processing, (RANLP’01), 2001, pp. 187–193.

Author:

David Jurgens

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	LogEntropyTransform.LogEntropyGlobalTransform The real implementation of the Log Entropy transformation as a GlobalTransform

Constructor Summary

Constructors

Constructor and Description
LogEntropyTransform()

Method Summary

Methods

Modifier and Type	Method and Description
protected GlobalTransform	getTransform(File inputMatrixFile, MatrixIO.Format format) Returns a GlobalTransform for a File of the given format.
protected GlobalTransform	getTransform(Matrix matrix) Returns a GlobalTransform for a Matrix.
String	toString() Returns the name of this transform.

Methods inherited from class edu.ucla.sspace.matrix.BaseTransform

transform, transform, transform, transform

Methods inherited from class java.lang.Object

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

Constructor Detail

LogEntropyTransform

public LogEntropyTransform()

Method Detail

getTransform

protected GlobalTransform getTransform(File inputMatrixFile,
                           MatrixIO.Format format)

Returns a GlobalTransform for a File of the given format.

Specified by:

getTransform in class BaseTransform

getTransform

protected GlobalTransform getTransform(Matrix matrix)

Returns a GlobalTransform for a Matrix.

Specified by:

getTransform in class BaseTransform

toString

public String toString()

Returns the name of this transform.

Overrides:

toString in class Object