Jisho

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確率文脈自由文法
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Wikipedia definition
1. Stochastic context-free grammar​A stochastic context-free grammar (SCFG; also probabilistic context-free grammar, PCFG) is a context-free grammar in which each production is augmented with a probability. The probability of a derivation (parse) is then the product of the probabilities of the productions used in that derivation; thus some derivations are more consistent with the stochastic grammar than others. SCFGs extend context-free grammars in the same way that hidden Markov models extend regular grammars.
Read “Stochastic context-free grammar” on English Wikipedia
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Read “Stochastic context-free grammar” on DBpedia

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