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Logic based lexical analyser LAX

  • Ryôichi Sugimura
  • Kôji Akasaka
  • Yukihiro Kubo
  • Yûji Matsumoto
Natural Language Processing
Part of the Lecture Notes in Computer Science book series (LNCS, volume 383)

Abstract

This paper describes a method of Japanese morphological analysis which runs in a sequential or parallel logic programming language. In the method presented here, a morphological dictionary is compiled into a logic program which executes lexical analysis deterministically.

Morphemes and their categories are written in a morphological dictionary. The categories are used as inputs to a non-deterministic finite state automaton (NFSA).

The dictionary is compiled into a TRIE structure in which morphemes can be quickly looked up using an index search mechanism such as those provided in logic programming languages like ESP or Prolog.

The layered stream technique, which records search space in recursively structured data, is applied in analysis. All solutions are given at the end of analysis. The analysis output can be used as input to the syntactic analyser, SAX, which can also be executed in parallel logic languages.

This method can process unknown morphemes which are not in the dictionary in linear order. This paper also reports the evaluation of this method in sequential languages.

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References

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Copyright information

© Springer-Verlag Berlin Heidelberg 1989

Authors and Affiliations

  • Ryôichi Sugimura
    • 1
  • Kôji Akasaka
    • 2
  • Yukihiro Kubo
    • 2
  • Yûji Matsumoto
    • 3
  1. 1.Matsushita Electric Industrial Co.,LTD.Japan
  2. 2.Institute for New Generation Computer Technology (ICOT)Japan
  3. 3.Kyoto UniversityJapan

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