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Proceedings of the 25th West Coast Conference on Formal Linguistics edited by Donald Baumer, David Montero, and Michael Scanlon ISBN 1-57473-415-6 library binding vii+461 pages publication date: 2006 published by Cascadilla Proceedings Project, Somerville, MA, USA Table of contents Abstract Jason Riggle Using Entropy to Learn OT Grammars from Surface Forms Alone 346-353 (complete pdf) The problem of ranking Optimality Theoretic constraints in a fashion that is consistent with a given set of (input, output) pairs has been solved with a variety of algorithms (cf. Tesar and Smolensky 2002, Boersma and Hayes 1999). The real-world problem of learning from outputs alone, however, still presents a host of challenges. Chief among these is the fact that there are often several (possible-input, possible-grammar) pairs that are consistent with a given set of surface forms. This paper explores strategies for learning from surface forms that use information-theoretic measures of the randomness (entropy) of the input set associated with each grammar hypothesis as a heuristic to select the grammars that maximally encode any observed patterns. This represents a straightforward use of the Richness of the Base Hypotheses (Smolensky 1996) to avoid encoding observed patterns as accidental patterns in the lexicon. |