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ID:43417791
大小:1.52 MB
页数:53页
时间:2019-10-08
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1、LexicalAcquisitionFulei2007-05-14OutlineIntroductionEvaluationmeasuresVerbsubcategorizationAttachmentambiguitySelectionalpreferencesSemanticsimilaritybetweenwordsSignificanceandfurtherreadingOutlineIntroductionEvaluationmeasuresVerbsubcategorizationAttachmentambiguitySelectionalpreferencesSemanti
2、csimilaritybetweenwordsSignificanceandfurtherreadingIntroductionGeneralgoalTodevelopalgorithmsandstatisticaltechniquesforfillingtheholesinexistingmachine-readabledictionariesbylookingattheoccurrencepatternsofwordsinlargetextcorpora.IntroductionLexicalacquisitionproblemsCollocationsVerbsubcategori
3、zationTherecipientofcontributeisexpressedasaprepositionalphrasewithtoAttachmentambiguityThechildrenatethecakewiththeirhandsThechildrenatethecakewithblueicingSemanticcategorizationWhatisthesemanticcategoryofanewwordthatisnotcoveredinourdictionarySelectionalpreferenceTheverbeatusuallytakesfooditems
4、asdirectobjectsOutlineIntroductionEvaluationmeasuresVerbsubcategorizationAttachmentambiguitySelectionalpreferencesSemanticsimilaritybetweenwordsSignificanceandfurtherreadingEvaluationmeasuresEvaluationmeasuresPrecisionRecallF-measureFalloutEvaluationmeasuresTarget=tp+fnSelected=tp+fpTotal=tn+fp+t
5、p+fnEvaluationmeasuresPrecision=tp/selected=tp/(tp+fp)MeasureoftheproportionofselecteditemsthatthesystemgotrightRecall=tp/target=tp/(tp+fn)MeasureoftheproportionofthetargetitemsthatthesystemselectedF=1/(α/P+(1-α)/R)Ifsetα=0.5,F=2PR/(P+R)Fallout=fp/(fp+tn)Measureoftheproportionofnon-targeteditemst
6、hatweremistakenlyselectedEvaluationmeasuresAcc=(tp+tn)/totalOutlineIntroductionEvaluationmeasuresVerbsubcategorizationAttachmentambiguitySelectionalpreferencesSemanticsimilaritybetweenwordsSignificanceandfurtherreadingVerbsubcategorizationDefinitionWerefertotheclassificationofverbsaccordingtothet
7、ypesofcomplementstheypermitassubcategorization.wesaythataverbsubcategorizesforaparticularcomplement.VerbsubcategorizationSubcategorizationframeAparticularsetofargumentsthataverbcanappearwithisreferredtoasasubcategoriza
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