Today I read a paper titled “Bottom-Up Earley Deduction”
The abstract is:
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..