edu.illinois.cs.cogcomp.edison.features.factory

Class WordNetFeatureExtractor

java.lang.Object

edu.illinois.cs.cogcomp.edison.features.WordFeatureExtractor

edu.illinois.cs.cogcomp.edison.features.factory.WordNetFeatureExtractor

All Implemented Interfaces:

FeatureExtractor

public class WordNetFeatureExtractor
extends WordFeatureExtractor

This feature extractor generates the following WordNet based features from a word: synonyms, synsets, hypernyms, hypernym-sets.

The behavior for multiple word constituents is just like the WordFeatureExtractor:

If the input constituent is not a word, then the feature extractor can do one of two things: If a flag is set in the constructor, then it will generate features from the last word of the constituent. If the flag is not set, then it will throw a FeatureException.

Note: you must call addFeatureType(WordNetFeatureClass) in order to specify which types of WordNet features you would like. If you do not add any feature types, no features will be returned. See WordNetFeatureExtractor.WordNetFeatureClass to learn about WordNet feature types.

Author:

Vivek Srikumar

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	WordNetFeatureExtractor.WordNetFeatureClass Feature types as used in addFeatureType(WordNetFeatureClass).

Field Summary

Fields

Modifier and Type	Field and Description
static WordNetManager	wnManager

Constructor Summary

Constructors

Constructor and Description
WordNetFeatureExtractor() Creates a new WordNetFeatureExtractor.
WordNetFeatureExtractor(boolean useLastWord) Creates a new WordNetFeatureExtractor.

Method Summary

Modifier and Type	Method and Description
void	addFeatureType(WordNetFeatureExtractor.WordNetFeatureClass name) Specify which types of features you would like this feature extractor to extract.
String	getName()
Set<Feature>	getWordFeatures(TextAnnotation ta, int tokenPosition)

Methods inherited from class edu.illinois.cs.cogcomp.edison.features.WordFeatureExtractor

convertToWordFeatureExtractor, getFeatures

Methods inherited from class java.lang.Object

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

Field Detail

wnManager

public static WordNetManager wnManager

Constructor Detail

WordNetFeatureExtractor

public WordNetFeatureExtractor(boolean useLastWord)
                        throws FileNotFoundException,
                               net.didion.jwnl.JWNLException

Creates a new WordNetFeatureExtractor.

It is probably safest to the parameter useLastWord to true. This will provide a check to ensure that the WordNetFeatureExtractor only sees words.

Throws:

FileNotFoundException

net.didion.jwnl.JWNLException

WordNetFeatureExtractor

public WordNetFeatureExtractor()
                        throws FileNotFoundException,
                               net.didion.jwnl.JWNLException

Creates a new WordNetFeatureExtractor. This constructor is equivalent to calling new WordNetFeatureExtractor(false).

Throws:

net.didion.jwnl.JWNLException

FileNotFoundException

See Also:

WordNetFeatureExtractor(boolean)

Method Detail

addFeatureType

public void addFeatureType(WordNetFeatureExtractor.WordNetFeatureClass name)

Specify which types of features you would like this feature extractor to extract. This must be called at least once or the feature extractor will return nothing.

Parameters:

name - feature type

getWordFeatures

public Set<Feature> getWordFeatures(TextAnnotation ta,
                                    int tokenPosition)
                             throws EdisonException

Specified by:

getWordFeatures in class WordFeatureExtractor

Throws:

EdisonException

getName

public String getName()

Specified by:

getName in interface FeatureExtractor

Overrides:

getName in class WordFeatureExtractor