A Bootstrap Approach to Automatically Generating Lexical Transfer Rules

Details A Bootstrap Approach to Automatically Generating Lexical Transfer Rules A Bootstrap Approach to Automatically Generating Lexical Transfer Rules

1999-07-09

arxiv.org/abs/cs/9907017v1

Computer Science

Computation and Language

8 pages, 1 figure, to be presented at Machine Translation Summit VII, September 13-17, 1999, Singapore

Scientific paper

We describe a method for automatically generating Lexical Transfer Rules (LTRs) from word equivalences using transfer rule templates. Templates are skeletal LTRs, unspecified for words. New LTRs are created by instantiating a template with words, provided that the words belong to the appropriate lexical categories required by the template. We define two methods for creating an inventory of templates and using them to generate new LTRs. A simpler method consists of extracting a finite set of templates from a sample of hand coded LTRs and directly using them in the generation process. A further method consists of abstracting over the initial finite set of templates to define higher level templates, where bilingual equivalences are defined in terms of correspondences involving phrasal categories. Phrasal templates are then mapped onto sets of lexical templates with the aid of grammars. In this way an infinite set of lexical templates is recursively defined. New LTRs are created by parsing input words, matching a template at the phrasal level and using the corresponding lexical categories to instantiate the lexical template. The definition of an infinite set of templates enables the automatic creation of LTRs for multi-word, non-compositional word equivalences of any cardinality.

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