Per-node Optimization of Finite-State Mechanisms for Natural Language Processing
Finite-state processing is typically based on structures that allow for efficient indexing and sequential search. However, this “rigid” framework has several disadvantages when used in natural language processing, especially for non-alphabetical languages. The solution is to systematically introduce polymorphic programming techniques that are adapted to particular cases. In this paper we describe the structure of a morphological dictionary implemented with finite-state automata using variable or polymorphic node formats. Each node is assigned a format from a predefined set reflecting its utility in corpora processing as measured by a number of graph theoretic metrics and statistics. Experimental results demonstrate that this approach permits a 52% increase in the performance of dictionary look-up.
KeywordsNatural Language Processing Flowing Link Memory Overhead Finite State Transduction Corpus Processing
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- 1.Kiraz, G.: Compressed storage of sparse finite-state transducers. In O. Boldt, H. Jurgensen, and L. Robbins, editors, Workshop on Implementing Automata WIA99-Pre-Proceedings, Potsdam, July, 1999.Google Scholar
- 2.Goetz, T., Wunsch, H.: An Abstract Machine Approach to Finite State Transduction over Large Character Sets. Finite State Methods in Natural Language Processing 2001. ESSLLI Workshop, August 20-24, Helsinki.Google Scholar