edu.ucla.sspace.grefenstette

Class Grefenstette

java.lang.Object

edu.ucla.sspace.grefenstette.Grefenstette

All Implemented Interfaces:

SemanticSpace

public class Grefenstette
extends Object
implements SemanticSpace

An implementation of a semantic space built from syntactic co-occurrence, as described by Grefenstette. See the following references for full details.

• G. Grefenstette, Explorations in Automatic Thesaurus Discovery. Indiana University Press, 1994.

Author:

Grace Park

Constructor Summary

Constructors

Constructor and Description
Grefenstette() Constructs an instance using the system properties for any required configuration

Method Summary

Methods

Modifier and Type	Method and Description
String	getSpaceName() Returns a unique string describing the name and configuration of this algorithm.
Vector	getVector(String word) Returns the semantic vector for the provided word.
int	getVectorLength() Returns the length of vectors in this semantic space.
Set<String>	getWords() Returns the set of words that are represented in this semantic space.
void	processDocument(BufferedReader document) Processes the contents of the provided file as a document.
void	processSpace(Properties properties) Does nothing.

Methods inherited from class java.lang.Object

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

Constructor Detail

Grefenstette

public Grefenstette()

Constructs an instance using the system properties for any required configuration

Throws:

IOError - if unable to create the backing file to hold data while processing

Method Detail

processDocument

public void processDocument(BufferedReader document)

Processes the contents of the provided file as a document.

Specified by:

processDocument in interface SemanticSpace

Parameters:

document - a reader that allows access to the text of the document

getWords

public Set<String> getWords()

Returns the set of words that are represented in this semantic space.

Specified by:

getWords in interface SemanticSpace

Returns:

the set of words that are represented in this semantic space.

getVector

public Vector getVector(String word)

Returns the semantic vector for the provided word.

Specified by:

getVector in interface SemanticSpace

Parameters:

word - a word that may be in the semantic space

Returns:

The Vector for the provided word or null if the word was not in the space.

processSpace

public void processSpace(Properties properties)

Does nothing.

Specified by:

processSpace in interface SemanticSpace

Parameters:

properties - a set of properties and values that may be used to configure any exposed parameters of the algorithm.

getSpaceName

public String getSpaceName()

Returns a unique string describing the name and configuration of this algorithm. Any configurable parameters that would affect the resulting semantic space should be expressed as a part of this name.

Specified by:

getSpaceName in interface SemanticSpace

getVectorLength

public int getVectorLength()

Returns the length of vectors in this semantic space. Implementations are left free to define whether the returned value is valid before processSpace is called.

Specified by:

getVectorLength in interface SemanticSpace