منابع مشابه
R70-3 On Stochastic Languages
Although considerable progress has been made in the understanding of the more "algebraic" properties of context-free languages, the quantitative aspects of the recognition and parsing of contextfree languages are still far from well understood. It was shown by Kasami and Younger that for every context-free language there exists a multitape Turing machine which recognizes this language and uses ...
متن کاملStochastic Languages and Stochastic Grammars
Two types of stochastic grammars are introduced for investigation: the (classical) unrestricted stoch-astic grammars and the (newly introduced) weakly restricted stochastic grammars. Especially consistency and conditions for it will be treated. The theory of multitype Galton-Watson branching processes and generating functions is of central importance to nd criteria for consistency. We will prov...
متن کاملOn the unary equivalence of stochastic languages and stochastic context-free languages
We show that every unary stochastic context-free grammar with polynomially bounded ambiguity, has an equivalent probabilistic automaton.
متن کاملRational stochastic languages
The goal of the present paper is to provide a systematic and comprehensive study of rational stochastic languages over a semiring K ∈ {Q,Q,R,R}. A rational stochastic language is a probability distribution over a free monoid Σ which is rational over K, that is which can be generated by a multiplicity automata with parameters in K. We study the relations between the classes of rational stochasti...
متن کاملLearning Rational Stochastic Languages
Given a finite set of words w1, . . . , wn independently drawn according to a fixed unknown distribution law P called a stochastic language, an usual goal in Grammatical Inference is to infer an estimate of P in some class of probabilistic models, such as Probabilistic Automata (PA). Here, we study the class S R (Σ) of rational stochastic languages, which consists in stochastic languages that c...
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ژورنال
عنوان ژورنال: Information and Control
سال: 1968
ISSN: 0019-9958
DOI: 10.1016/s0019-9958(68)90360-4