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Progress report on SRL

Progress report on SRL. Abdul- Lateef Yussif 11-03-2011. Agenda. CoNLL 2004 Shared Tasks Data Set Format of Data Set. Example of annotated sentence. IOB2 Format. The IOB2 format represents chunks which do not overlap nor embed. Words outside a chunk receive the tag O.

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Progress report on SRL

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  1. Progress report on SRL Abdul-LateefYussif 11-03-2011

  2. Agenda • CoNLL 2004 Shared Tasks • Data Set • Format of Data Set

  3. Example of annotated sentence

  4. IOB2 Format • The IOB2 format represents chunks which do not overlap nor embed. • Words outside a chunk receive the tag O. • For words inside a chunk of type $k, the first word receives the “B-$k” tag (Begin), and the remaining words receive the tag “I-$k” (Inside).

  5. Find potential Arguments • An argument can be any consecutive words • Restrict potential arguments • BEGIN(word) = word begins argument • END(word) = word ends argument • Argument • (wi…..wj) is a potential argument iff • BEGIN(wi) = 1 and END(wj) = 1

  6. Classifiers & Features • I intend to use support vector with the following features • Words • Predicate lemmas • POS • Token Position • Path • Headword • length

  7. Data and evaluation Metrics • CoNLL 2004 dataset • Part of the Propbank Corpus • Consists from the Wall Street Journal of the Penn Treebank • Training (Section 15-18) • Development (Section 20) • Testing data (Section 21)

  8. Hypothesis • Target is to replicate and improved on Best System performance

  9. Questions Thank you

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