edu.stanford.nlp.wordseg

Class ChineseSegmenterFeatureFactory<IN extends CoreLabel>

java.lang.Object

edu.stanford.nlp.sequences.FeatureFactory<IN>

edu.stanford.nlp.wordseg.ChineseSegmenterFeatureFactory<IN>

All Implemented Interfaces:

Serializable

public class ChineseSegmenterFeatureFactory<IN extends CoreLabel>
extends FeatureFactory<IN>
implements Serializable

A Chinese segmenter Feature Factory for GALE project. (modified from Sighan Bakeoff 2005.) This is supposed to have all the good closed-track features from Sighan bakeoff 2005, and some other "open-track" features This will also be used to do a character-based chunking!

c is Chinese character ("char"). c means current, n means next and p means previous.

Feature	Templates
	Current position clique
useWord1	CONSTANT, cc, nc, pc, pc+cc, if (As|Msr|Pk|Hk) cc+nc, pc,nc

Author:

Huihsin Tseng, Pichuan Chang

See Also:

Serialized Form

Field Summary

Fields inherited from class edu.stanford.nlp.sequences.FeatureFactory

cliqueC, cliqueCnC, cliqueCp2C, cliqueCp3C, cliqueCp4C, cliqueCp5C, cliqueCpC, cliqueCpCnC, cliqueCpCp2C, cliqueCpCp2Cp3C, cliqueCpCp2Cp3Cp4C, cliqueCpCp2Cp3Cp4Cp5C, flags, knownCliques

Constructor Summary

Constructors

Constructor and Description
ChineseSegmenterFeatureFactory()

Method Summary

Methods

Modifier and Type	Method and Description
Collection<String>	featuresC(PaddedList<IN> cInfo, int loc)
Collection<String>	featuresCnC(PaddedList<IN> cInfo, int loc)
Collection<String>	featuresCpC(PaddedList<IN> cInfo, int loc)
Collection<String>	getCliqueFeatures(PaddedList<IN> cInfo, int loc, Clique clique) Extracts all the features from the input data at a certain index.
void	init(SeqClassifierFlags flags)

Methods inherited from class edu.stanford.nlp.sequences.FeatureFactory

addAllInterningAndSuffixing, getCliques, getCliques, getWord

Methods inherited from class java.lang.Object

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

Constructor Detail

ChineseSegmenterFeatureFactory

public ChineseSegmenterFeatureFactory()

Method Detail

init

public void init(SeqClassifierFlags flags)

Overrides:

init in class FeatureFactory<IN extends CoreLabel>

getCliqueFeatures

public Collection<String> getCliqueFeatures(PaddedList<IN> cInfo,
                                   int loc,
                                   Clique clique)

Extracts all the features from the input data at a certain index.

Specified by:

getCliqueFeatures in class FeatureFactory<IN extends CoreLabel>

Parameters:

cInfo - The complete data set as a List of WordInfo

loc - The index at which to extract features.

clique - The particular clique for which to extract features. It should be a member of the knownCliques list.

Returns:

A Collection of the features calculated for the word at the specified position in info.

featuresC

public Collection<String> featuresC(PaddedList<IN> cInfo,
                           int loc)

featuresCpC

public Collection<String> featuresCpC(PaddedList<IN> cInfo,
                             int loc)

featuresCnC

public Collection<String> featuresCnC(PaddedList<IN> cInfo,
                             int loc)