Treatment of Numerical Classifier Based on Lexical-Functional Grammar

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  • Ohkuma Tomoko
    Research and Technology Group, System Technology Laboratory, Fuji Xerox Co., Ltd.
  • Umemoto Hiroshi
    Research and Technology Group, System Technology Laboratory, Fuji Xerox Co., Ltd.
  • Miura Yasuhide
    Research and Technology Group, System Technology Laboratory, Fuji Xerox Co., Ltd.
  • Masuichi Hiroshi
    Research and Technology Group, System Technology Laboratory, Fuji Xerox Co., Ltd.

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  • 日本語ＬＦＧにもとづく助数詞の処理
  • ニホンゴ LFG ニ モトズク ジョスウシ ノ ショリ

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Abstract

Japanese numeral classifier (NC) expresses quantificational expressions by following number nouns. The parser based on phrase structure grammar like Lexical-Functional Grammar (LFG) or Head-driven Phrase Structure Grammar (HPSG) has to define the relationships between noun and NC or number and NC by the grammatical rules. NC has various relationships syntactically because of its’ various characteristics. The treatment of NCs in LFG formalism should take account of their lexical and syntactical characteristics. This report proposed LFG rules for NCs and examined their validity and accuracy. The comparison between Japanese f-structure inducted by the rules proposed in this report and English f-structure and Chinese f-structure which correspond to the Japanese f-structures show that the rules make f-structures parallel between same phrases in Japanese and in other languages. The experiment of evaluations shows the rules improve F-score of NCs for currency and unit from 52.10% to 77.90% and F-score of NCs for quantity from 81.92% to 87.32% and F-score of NCs for Order from 59.62% to 81.26%.

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