Unsupervised Entailment Detection between Dependency Graph Fragments

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• Marek Rei, University of Cambridge
• Sunday 05 June 2011, 12:30-13:00
• FW26, Computer Laboratory.

If you have a question about this talk, please contact Thomas Lippincott.

Entailment detection systems are generally designed to work either on single words, relations or full sentences. We propose a new task – detecting entailment between dependency graph fragments of any type – which relaxes these restrictions and leads to much wider entailment discovery. An unsupervised framework is described that uses intrinsic similarity, multi-level extrinsic similarity and the detection of negation and hedged language to assign a confidence score to entailment relations between two fragments. The final system achieves 84.1% average precision on a data set of entailment examples from the biomedical domain.

This talk is part of the NLIP Seminar Series series.

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