info.ephyra.answerselection.filters
Class YahooTermImportanceFilter

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

public class YahooTermImportanceFilter
extends WebTermImportanceFilter

A web term importance filter that counts term frequencies in text snippets retrieved with the Yahoo search engine.

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 int	MAX_RESULTS_PERQUERY Maximum number of search results per query.
private static int	RETRIES Number of retries if search fails.
private static java.lang.String	YAHOO_ID Yahoo application ID, allows 5,000 queries per day and IP address.

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

YahooTermImportanceFilter(int normalizationMode, int tfNormalizationMode, boolean isCombined)

Method Summary

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

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

addTermCounters, apply, getCountSum, getMaxCount, getTargets, main, 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

YAHOO_ID

private static final java.lang.String YAHOO_ID

Yahoo application ID, allows 5,000 queries per day and IP address.

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

Constructor Detail

YahooTermImportanceFilter

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

Parameters:

normalizationMode -

tfNormalizationMode -

isCombined -

Method Detail

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[])