Fusion of knowledge-based and data-driven approaches to grammar induction
Spiros Georgiladakis, Christina Unger, Elias Iosif, Sebastian Walter, Philipp Cimiano, Euripides G. M. Petrakis, Alexandros Potamianos · 2014
Using different sources of information for grammar induction results in grammars that vary in coverage and precision. Fusing such grammars with a strategy that exploits their strengths while minimizing their weaknesses is expected to produce grammars with superior performance. We focus on the fusion of grammars produced using a knowledge-based approach using lexicalized ontologies and a data-driven approach using semantic similarity clustering. We propose various algorithms for finding the map-ping between the (non-terminal) rules generated by each gram-mar induction algorithm, followed by rule fusion. Three fusion approaches are investigated: early, mid and late fusion. Results show that late fusion provides the best relative F-measure per-formance improvement by 20%. Index Terms: spoken dialogue systems, corpus-based grammar induction, ontology-based grammar induction, grammar fusion