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Bottom-Up Earley Deduction

Gregor Erbach
Universität des Saarlandes, CLAUS-Report, Vol. 39, 4/1994.


We propose a bottom-up variant of Earley deduction. Bottom-up deduction is preferable to top-down deduction because it allows incremental processing (even for head-driven grammars), it is data-driven, no subsumption check is needed, and preference values attached to lexical items can be used to guide best-first search. We discuss the scanning step for bottom-up Earley deduction and indexing schemes that help avoid useless deduction steps.

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