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Automatic Semantic Role Tagger

Automatic Semantic Role Tagger. Szu-Ting Yi. Overview. Classification-based Probabilistic model Constituent-based. Current Implementation. Daniel Gildea & Martha Palmer (ACL 2002) Multi-class SVM (using libsvm package from CSIE, NTU) Kernel: radial basis Degree: 3. Feature Sets.

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Automatic Semantic Role Tagger

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  1. Automatic Semantic Role Tagger Szu-Ting Yi

  2. Overview • Classification-based • Probabilistic model • Constituent-based

  3. Current Implementation • Daniel Gildea & Martha Palmer (ACL 2002) • Multi-class SVM (using libsvm package from CSIE, NTU) • Kernel: radial basis • Degree: 3

  4. Feature Sets • Verb – the predicate • Phrasal type • Path • Voice • Position • Sub_cat frame

  5. Results

  6. Problems • Model selection • Trade-off between more lexical information & data sparseness

  7. cluster slot verb role noun Verb Clustering • (revised model of Gildea 2002)

  8. Results

  9. Conclusion & Future work • Automatic constituent boundary detection • Incorporating more features • Other machine learning models

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