Graphical models for entity coreference resolution

by Venkateshan, Priya, M.S., UNIVERSITY OF CALIFORNIA, IRVINE, 2011, 63 pages; 1505612

Abstract:

Entity Resolution, the problem of resolving token sequences in text to discourse entities, is a key problem in the Natural Language Processing domain, to solve which, statistical machine learning techniques are increasingly being utilized.

One of the most commonly-used frameworks for viewing Entity Resolution as a supervised learning problem is the Mention-Pair model, where as a first step, pairwise decisions are taken regarding every pair of token sequences, or mentions, regarding whether they refer to the same discourse entity or not. A trained classier is used for this purpose. The second step involves creating coreference chains taking into account these pairwise decisions.

In this dissertation, we present two supervised learning approaches to Entity Resolution. The first approach uses Affinity Propagation, a message-passing algorithm, to create coreference chains, taking as input pairwise probabilities of coreference given by a trained classier. This method also seeks to incorporate linguistic information like Part-of-Speech tags.

The second approach looks at methods that enforce transitivity within coreference chains while building them, and attempts to learn only over valid configurations. It uses the concept of pseudo-likelihood for this.

Both our methods perform better than the baselines we compare them against, and on par, or better than the other supervised learning approaches to Entity Resolution published on the Semeval Coreference Resolution Task dataset.

AdviserAlexander Ihler
SchoolUNIVERSITY OF CALIFORNIA, IRVINE
Source TypeThesis
SubjectsComputer science
Publication Number1505612

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