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SUMMARY:Modeling Semantic Containment and Exclusion in Natural Language In
 ference - Øistein Andersen\, Computer Laboratory
DTSTART:20081112T130000Z
DTEND:20081112T140000Z
UID:TALK15195@talks.cam.ac.uk
CONTACT:Diarmuid Ó Séaghdha
DESCRIPTION:The paper for discussion this week will be:\n\nBill McCartney 
 and Christopher D. Manning. "Modeling Semantic Containment and Exclusion i
 n Natural Language Inference":http://www.aclweb.org/anthology-new/C/C08/C0
 8-1066.pdf\nProceedings of COLING-08 (received the Best Paper Award at COL
 ING)\n\nAbstract:\n\nWe propose an approach to natural language inference 
  based on a model of natural logic\, which identifies valid inferences by 
 their lexical and syntactic features\, without full semantic interpretatio
 n.\nWe greatly extend past work in natural logic\, which has focused solel
 y on semantic containment and monotonicity\, to incorporate both semantic 
 exclusion and implicativity. Our system decomposes an inference\nproblem i
 nto a sequence of atomic edits linking premise to hypothesis\; predicts a 
 lexical entailment relation for each edit using a statistical classifier\;
  propagates these relations upward through a syntax tree according to sema
 ntic properties of intermediate nodes\; and composes the resulting\nentail
 ment relations across the edit sequence. We evaluate our system on the Fra
 CaS test suite\, and achieve a 27% reduction in error from previous work. 
 We also show that hybridizing an existing RTE\nsystem with our natural log
 ic system yields significant gains on the RTE3 test suite. 
LOCATION:GS15\, Computer Laboratory
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