/** Initializes the pipeline for factoid questions. */
protected void initFactoid() {
// question analysis
Ontology wordNet = new WordNet();
// - dictionaries for term extraction
QuestionAnalysis.clearDictionaries();
QuestionAnalysis.addDictionary(wordNet);
// - ontologies for term expansion
QuestionAnalysis.clearOntologies();
QuestionAnalysis.addOntology(wordNet);
// query generation
QueryGeneration.clearQueryGenerators();
QueryGeneration.addQueryGenerator(new BagOfWordsG());
QueryGeneration.addQueryGenerator(new BagOfTermsG());
QueryGeneration.addQueryGenerator(new PredicateG());
QueryGeneration.addQueryGenerator(new QuestionInterpretationG());
QueryGeneration.addQueryGenerator(new QuestionReformulationG());
// search
// - knowledge miners for unstructured knowledge sources
Search.clearKnowledgeMiners();
for (String[] indriIndices : IndriKM.getIndriIndices())
Search.addKnowledgeMiner(new IndriKM(indriIndices, false));
// for (String[] indriServers : IndriKM.getIndriServers())
// Search.addKnowledgeMiner(new IndriKM(indriServers, true));
// - knowledge annotators for (semi-)structured knowledge sources
Search.clearKnowledgeAnnotators();
// answer extraction and selection
// (the filters are applied in this order)
AnswerSelection.clearFilters();
// - answer extraction filters
AnswerSelection.addFilter(new AnswerTypeFilter());
AnswerSelection.addFilter(new AnswerPatternFilter());
AnswerSelection.addFilter(new WebDocumentFetcherFilter());
AnswerSelection.addFilter(new PredicateExtractionFilter());
AnswerSelection.addFilter(new FactoidsFromPredicatesFilter());
AnswerSelection.addFilter(new TruncationFilter());
// - answer selection filters
AnswerSelection.addFilter(new StopwordFilter());
AnswerSelection.addFilter(new QuestionKeywordsFilter());
AnswerSelection.addFilter(new ScoreNormalizationFilter(NORMALIZER));
AnswerSelection.addFilter(new ScoreCombinationFilter());
AnswerSelection.addFilter(new FactoidSubsetFilter());
AnswerSelection.addFilter(new DuplicateFilter());
AnswerSelection.addFilter(new ScoreSorterFilter());
}
/**
* Asks Ephyra a factoid question and returns up to <code>maxAnswers</code> results that have a
* score of at least <code>absThresh</code>.
*
* @param question factoid question
* @param maxAnswers maximum number of answers
* @param absThresh absolute threshold for scores
* @return array of results
*/
public Result[] askFactoid(String question, int maxAnswers, float absThresh) {
// initialize pipeline
initFactoid();
// analyze question
MsgPrinter.printAnalyzingQuestion();
AnalyzedQuestion aq = QuestionAnalysis.analyze(question);
// get answers
Result[] results = runPipeline(aq, maxAnswers, absThresh);
return results;
}