info.ephyra.questionanalysis.atype.classifier
Class RuleBasedQuestionClassifier

java.lang.Object
  info.ephyra.questionanalysis.atype.QuestionClassifier
      info.ephyra.questionanalysis.atype.classifier.RuleBasedQuestionClassifier

public class RuleBasedQuestionClassifier
extends QuestionClassifier

A rule-based classifier for the answer type of a question.

Version:

2008-02-10

Author:

Justin Betteridge

Field Summary

private java.lang.String	defaultLabel
private static org.apache.log4j.Logger	log
private java.util.List<Rule>	rules

Fields inherited from class info.ephyra.questionanalysis.atype.QuestionClassifier

extractor, isInitialized, languagePair

Constructor Summary

RuleBasedQuestionClassifier()

Method Summary

java.util.List<AnswerType>	classify(edu.cmu.minorthird.classify.Instance instance) Classifies a question, represented by an Instance, in terms of its expected answer type.
java.lang.String	getDefaultLabel()
static java.lang.String	getFeatureValue(edu.cmu.minorthird.classify.Instance instance, java.lang.String featName) Retrieves the value of the given feature from the given Instance.
void	initialize() Initializes the FeatureExtractor.
private void	loadRulesFile(java.lang.String fileName)
void	setDefaultLabel(java.lang.String defaultLabel)

Methods inherited from class info.ephyra.questionanalysis.atype.QuestionClassifier

classifySet, evaluate, getAnswerTypes, getAnswerTypes, getAnswerTypes, getLanguagePair, isInitialized, setInitialized, setLanguagePair

Methods inherited from class java.lang.Object

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

Field Detail

log

private static final org.apache.log4j.Logger log

rules

private java.util.List<Rule> rules

defaultLabel

private java.lang.String defaultLabel

Constructor Detail

RuleBasedQuestionClassifier

public RuleBasedQuestionClassifier()

Method Detail

initialize

public void initialize()
                throws java.lang.Exception

Description copied from class: QuestionClassifier

Initializes the FeatureExtractor.

Overrides:

initialize in class QuestionClassifier

Throws:

java.lang.Exception - if one of the required input properties is not defined

classify

public java.util.List<AnswerType> classify(edu.cmu.minorthird.classify.Instance instance)

Description copied from class: QuestionClassifier

Classifies a question, represented by an Instance, in terms of its expected answer type. Multiple AnswerTypes may be returned, ranked by their associated score, or probability of being ccrrect. The source object associated with the Instance that is returned by Instance.getSource() must be the original question, in String form.

Specified by:

classify in class QuestionClassifier

Parameters:

instance - the Instance to be classified.

Returns:

a list of AnswerTypes, ranked by their associated score, or probability of being ccrrect.

getFeatureValue

public static java.lang.String getFeatureValue(edu.cmu.minorthird.classify.Instance instance,
                                               java.lang.String featName)

Retrieves the value of the given feature from the given Instance.

Parameters:

instance - the Instance to consider

featName - the name of the feature

loadRulesFile

private void loadRulesFile(java.lang.String fileName)

getDefaultLabel

public java.lang.String getDefaultLabel()

Returns:

the defaultLabel

setDefaultLabel

public void setDefaultLabel(java.lang.String defaultLabel)

Parameters:

defaultLabel - the defaultLabel to set