منابع مشابه
Bottom-Up Tree Acceptors
This paper deals with the formal derivation of an eecient tabulation algorithm for table-driven bottom-up tree acceptors. Bottom-up tree acceptors are based on a notion of match sets. First we derive a naive acceptance algorithm using dynamic computation of match sets. Tabulation of match sets leads to an eecient acceptance algorithm, but tables may be so large that they can not be generated du...
متن کاملMinimization of Deterministic Bottom-Up Tree Transducers
We show that for every deterministic bottom-up tree transducer, a unique equivalent transducer can be constructed which is minimal. The construction is based on a sequence of normalizing transformations which, among others, guarantee that non-trivial output is produced as early as possible. For a deterministic bottom-up transducer where every state produces either none or infinitely many output...
متن کاملCompositions of Bottom-Up Tree Series Transformations
Tree series transformations computed by bottom-up tree series transducers are called bottom-up tree series transformations. (Functional) compositions of such transformations are investigated. It turns out that bottom-up tree series transformations over commutative and א0-complete semirings are closed under left-composition with linear bottom-up tree series transformations and right-composition ...
متن کاملString-to-Tree Multi Bottom-up Tree Transducers
We achieve significant improvements in several syntax-based machine translation experiments using a string-to-tree variant of multi bottom-up tree transducers. Our new parameterized rule extraction algorithm extracts string-to-tree rules that can be discontiguous and non-minimal in contrast to existing algorithms for the tree-to-tree setting. The obtained models significantly outperform the str...
متن کاملSystolic Tree Acceptors
— This paper introduces systolic automata for VLSI as highly concurrent acceptors. Attention is focused on tree automata although other types are also discussed briefly. A number of preliminary results about the capabilities of such automata are obtained. The approach not only opens up a new and interesting area oflanguage theory but also its results give useful hints for VLSI system design par...
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ژورنال
عنوان ژورنال: Science of Computer Programming
سال: 1989
ISSN: 0167-6423
DOI: 10.1016/0167-6423(89)90015-4