info.ephyra.trec
Class CorefResolver

java.lang.Object
  info.ephyra.trec.CorefResolver

public class CorefResolver
extends java.lang.Object

This class resolves references within a question string to the target description, previous questions or previous answers as required since the TREC 13 QA track.

Version:

2007-07-20

Author:

Petra Gieselmann, Nico Schlaefer, Manas Pathak

Field Summary

static java.util.regex.Pattern	pluralDemPronounPattern
static java.lang.String	pluralDemPronounString Regular expression for English singular demonstrative pronoun.
static java.util.regex.Pattern	pluralThirdPersonPronounPattern
static java.util.regex.Pattern	pluralThirdPersonPronounPatternGen
static java.lang.String	pluralThirdPersonPronounString Regular expression for English plural third person personal pronouns.
static java.lang.String	pluralThirdPersonPronounStringGen Regular expression for English plural third person possessive pronouns.
static java.util.regex.Pattern	singularDemPronounPattern
static java.lang.String	singularDemPronounString Regular expression for English singular demonstrative pronoun.
static java.util.regex.Pattern	singularThirdPersonPronounPattern
static java.util.regex.Pattern	singularThirdPersonPronounPatternAmb
static java.util.regex.Pattern	singularThirdPersonPronounPatternGen
static java.lang.String	singularThirdPersonPronounString Regular expression for English singular third person personal pronouns for persons.
static java.lang.String	singularThirdPersonPronounStringAmb Regular expression for English singular third person personal and possessive pronoun her.
static java.lang.String	singularThirdPersonPronounStringGen Regular expression for English singular third person possessive pronouns for persons.
static java.util.regex.Pattern	singularThirdThingPronounPattern
static java.util.regex.Pattern	singularThirdThingPronounPatternGen
static java.lang.String	singularThirdThingPronounString Regular expression for English singular third person personal pronouns for things.
static java.lang.String	singularThirdThingPronounStringGen Regular expression for English singular third person possessive pronouns for things.
static java.util.regex.Pattern	verifyTargetPattern
static java.lang.String	verifyTargetString Regular expression for targets.

Constructor Summary

CorefResolver()

Method Summary

private static boolean	checkPl(java.lang.String[] targetTokens)
private static java.util.Map<java.lang.Integer,java.lang.String>	find(java.lang.String parse, java.lang.String POS) Finds all POS instances in parse
private static boolean	isAllUpper(java.lang.String s)
private static boolean	isAnswerTypePerson(java.lang.String question)
private static boolean	isAnswerTypeThing(java.lang.String question)
private static java.lang.String	isTargetPerson(java.lang.String currentTarget)
static void	main(java.lang.String[] args)
private static boolean	match(java.lang.String npq, java.lang.String npt) Checks if the first phrase is inclusive of the second
private static java.lang.String	parse(java.lang.String q) Returns the lexical parse of the string
static void	resolveNounPhrasesToTarget(TRECTarget target, int next)
static void	resolvePronouns(TRECTarget target, int next) Resolves references to the target description, previous questions or answers.
static void	resolvePronounsToTarget(TRECTarget target, int next) Resolves references ONLY to the target description.
private static java.util.ArrayList<java.lang.String>	resoveNP(java.lang.String targetString, java.lang.String question) Resolves questions given a target
private static java.lang.String	substitute(java.lang.String questionParse, java.lang.String npt, int lenq, int iq) Substitutes a target noun phrase for another noun phrase within a question string
private static java.lang.String	unparse(java.lang.String questionParse) Gets the original string back from its parse
private static java.lang.String	usePreviousAnswer(TRECQuestion[] questions, int next, int exp)

Methods inherited from class java.lang.Object

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

Field Detail

singularThirdPersonPronounString

public static final java.lang.String singularThirdPersonPronounString

Regular expression for English singular third person personal pronouns for persons.

See Also:

Constant Field Values

singularThirdPersonPronounPattern

public static final java.util.regex.Pattern singularThirdPersonPronounPattern

singularThirdThingPronounString

public static final java.lang.String singularThirdThingPronounString

Regular expression for English singular third person personal pronouns for things.

See Also:

Constant Field Values

singularThirdThingPronounPattern

public static final java.util.regex.Pattern singularThirdThingPronounPattern

pluralThirdPersonPronounString

public static final java.lang.String pluralThirdPersonPronounString

Regular expression for English plural third person personal pronouns.

See Also:

Constant Field Values

pluralThirdPersonPronounPattern

public static final java.util.regex.Pattern pluralThirdPersonPronounPattern

singularThirdPersonPronounStringGen

public static final java.lang.String singularThirdPersonPronounStringGen

Regular expression for English singular third person possessive pronouns for persons.

See Also:

Constant Field Values

singularThirdPersonPronounPatternGen

public static final java.util.regex.Pattern singularThirdPersonPronounPatternGen

singularThirdThingPronounStringGen

public static final java.lang.String singularThirdThingPronounStringGen

Regular expression for English singular third person possessive pronouns for things.

See Also:

Constant Field Values

singularThirdThingPronounPatternGen

public static final java.util.regex.Pattern singularThirdThingPronounPatternGen

pluralThirdPersonPronounStringGen

public static final java.lang.String pluralThirdPersonPronounStringGen

Regular expression for English plural third person possessive pronouns.

See Also:

Constant Field Values

pluralThirdPersonPronounPatternGen

public static final java.util.regex.Pattern pluralThirdPersonPronounPatternGen

singularThirdPersonPronounStringAmb

public static final java.lang.String singularThirdPersonPronounStringAmb

Regular expression for English singular third person personal and possessive pronoun her.

See Also:

Constant Field Values

singularThirdPersonPronounPatternAmb

public static final java.util.regex.Pattern singularThirdPersonPronounPatternAmb

singularDemPronounString

public static final java.lang.String singularDemPronounString

Regular expression for English singular demonstrative pronoun.

See Also:

Constant Field Values

singularDemPronounPattern

public static final java.util.regex.Pattern singularDemPronounPattern

pluralDemPronounString

public static final java.lang.String pluralDemPronounString

Regular expression for English singular demonstrative pronoun.

See Also:

Constant Field Values

pluralDemPronounPattern

public static final java.util.regex.Pattern pluralDemPronounPattern

verifyTargetString

public static final java.lang.String verifyTargetString

Regular expression for targets.

See Also:

Constant Field Values

verifyTargetPattern

public static final java.util.regex.Pattern verifyTargetPattern

Constructor Detail

CorefResolver

public CorefResolver()

Method Detail

resolvePronounsToTarget

public static void resolvePronounsToTarget(TRECTarget target,
                                           int next)

Resolves references ONLY to the target description. This method is called once for each factoid and list question in the series.

Parameters:

target - the question series including answers to previous questions

next - the next question in the series to be answered

isTargetPerson

private static java.lang.String isTargetPerson(java.lang.String currentTarget)

isAllUpper

private static boolean isAllUpper(java.lang.String s)

resolvePronouns

public static void resolvePronouns(TRECTarget target,
                                   int next)

Resolves references to the target description, previous questions or answers. This method is called once for each factoid and list question in the series.

Parameters:

target - the question series including answers to previous questions

next - the next question in the series to be answered

resolveNounPhrasesToTarget

public static void resolveNounPhrasesToTarget(TRECTarget target,
                                              int next)

Parameters:

target -

next -

resoveNP

private static java.util.ArrayList<java.lang.String> resoveNP(java.lang.String targetString,
                                                              java.lang.String question)

Resolves questions given a target

Parameters:

targetString - target

question - question

Returns:

ArrayList of resolved questions

parse

private static java.lang.String parse(java.lang.String q)

Returns the lexical parse of the string

find

private static java.util.Map<java.lang.Integer,java.lang.String> find(java.lang.String parse,
                                                                      java.lang.String POS)

Finds all POS instances in parse

Parameters:

parse - input parsed string

POS - part of speech tag

Returns:

A Map of POS tagged strings in input along with the position where they occur

substitute

private static java.lang.String substitute(java.lang.String questionParse,
                                           java.lang.String npt,
                                           int lenq,
                                           int iq)

Substitutes a target noun phrase for another noun phrase within a question string

Parameters:

questionParse - question String

npt - target noun phrase

lenq - length of original noun phrase in question string

iq - position of original noun phrase in question string

Returns:

resolved question string

unparse

private static java.lang.String unparse(java.lang.String questionParse)

Gets the original string back from its parse

match

private static boolean match(java.lang.String npq,
                             java.lang.String npt)

Checks if the first phrase is inclusive of the second

Parameters:

npq - parsed string

npt - parsed string

checkPl

private static boolean checkPl(java.lang.String[] targetTokens)

isAnswerTypePerson

private static boolean isAnswerTypePerson(java.lang.String question)

isAnswerTypeThing

private static boolean isAnswerTypeThing(java.lang.String question)

usePreviousAnswer

private static java.lang.String usePreviousAnswer(TRECQuestion[] questions,
                                                  int next,
                                                  int exp)

main

public static void main(java.lang.String[] args)
                 throws java.lang.Exception

Throws:

java.lang.Exception