info.ephyra.answerselection.filters
Class WikipediaGoogleTermImportanceFilter

java.lang.Object
  info.ephyra.answerselection.filters.Filter
      info.ephyra.answerselection.filters.WebTermImportanceFilter
          info.ephyra.answerselection.filters.WikipediaGoogleTermImportanceFilter

public class WikipediaGoogleTermImportanceFilter
extends WebTermImportanceFilter

A web term importance filter that counts term frequencies in a Wikipedia article on the target of the question. If no Wikipedia article is found, text snippets retrieved with the Google search engine are used instead.

This class extends the class WebTermImportanceFilter.

Version:

2008-02-15

Author:

Guido Sautter

Nested Class Summary

Nested classes/interfaces inherited from class info.ephyra.answerselection.filters.WebTermImportanceFilter

WebTermImportanceFilter.TermCounter

Field Summary

private static java.lang.String	GOOGLE_KEY Google license key.
private static int	MAX_RESULTS_PERQUERY Maximum number of search results per query.
private static int	MAX_RESULTS_TOTAL Maximum total number of search results.
private static java.util.HashMap<java.lang.String,WebTermImportanceFilter.TermCounter>	missPageTermCounters
private static int	RETRIES Number of retries if search fails.

Fields inherited from class info.ephyra.answerselection.filters.WebTermImportanceFilter

event, LINEAR_LENGTH_NORMALIZATION, location, LOG_10_LENGTH_NORMALIZATION, LOG_LENGTH_NORMALIZATION, NO_NORMALIZATION, organization, person, SQUARE_ROOT_LENGTH_NORMALIZATION, TEST_TARGET_GENERATION

Constructor Summary

WikipediaGoogleTermImportanceFilter(int normalizationMode, int tfNormalizationMode, boolean isCombined)

Method Summary

private java.util.HashMap<java.lang.String,WebTermImportanceFilter.TermCounter>	getGoogleTermCounters(java.lang.String target)
java.util.HashMap<java.lang.String,WebTermImportanceFilter.TermCounter>	getTermCounters(java.lang.String[] targets) fetch the term frequencies in the top X result snippets of a web search for some target
private void	initMissTerms()
static void	main(java.lang.String[] args)

Methods inherited from class info.ephyra.answerselection.filters.WebTermImportanceFilter

addTermCounters, apply, getCountSum, getMaxCount, getTargets, sumDiff

Methods inherited from class info.ephyra.answerselection.filters.Filter

apply

Methods inherited from class java.lang.Object

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

Field Detail

GOOGLE_KEY

private static final java.lang.String GOOGLE_KEY

Google license key.

See Also:

Constant Field Values

MAX_RESULTS_TOTAL

private static final int MAX_RESULTS_TOTAL

Maximum total number of search results.

See Also:

Constant Field Values

MAX_RESULTS_PERQUERY

private static final int MAX_RESULTS_PERQUERY

Maximum number of search results per query.

See Also:

Constant Field Values

RETRIES

private static final int RETRIES

Number of retries if search fails.

See Also:

Constant Field Values

missPageTermCounters

private static java.util.HashMap<java.lang.String,WebTermImportanceFilter.TermCounter> missPageTermCounters

Constructor Detail

WikipediaGoogleTermImportanceFilter

public WikipediaGoogleTermImportanceFilter(int normalizationMode,
                                           int tfNormalizationMode,
                                           boolean isCombined)

Parameters:

normalizationMode -

tfNormalizationMode -

isCombined -

Method Detail

initMissTerms

private void initMissTerms()

getTermCounters

public java.util.HashMap<java.lang.String,WebTermImportanceFilter.TermCounter> getTermCounters(java.lang.String[] targets)

Description copied from class: WebTermImportanceFilter

fetch the term frequencies in the top X result snippets of a web search for some target

Specified by:

getTermCounters in class WebTermImportanceFilter

Parameters:

targets - an array of strings containing the targets

Returns:

a HashMap mapping the terms in the web serach results to their frequency in the snippets

See Also:

WebTermImportanceFilter.getTermCounters(java.lang.String[])

getGoogleTermCounters

private java.util.HashMap<java.lang.String,WebTermImportanceFilter.TermCounter> getGoogleTermCounters(java.lang.String target)

main

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