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probabilistic lexicalized context-free grammars
probabilistic lexicalized context-free grammars

... principles of PLCFG, and then gives a suggestion, for an implementation on a PLCFG within a limited Turkish lexicon and grammar. An easy way to think of a lexicalized grammar is as a context free grammar with a lot more rules; it is as if we created many copies of each rule, one copy for each possib ...
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a
town
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outside
Nurenberg.

When?
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1920
just
after
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lived
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a
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LARG-20010510
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... • Enables using domain-dependent grammars without expert intervention. • Enables using person-dependent grammars without expert intervention. • Can be used on different languages (without a linguist familiar with the particular language). • A process of grammar induction with expert guidance may be ...
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Introduction to Computational Natural Language
Introduction to Computational Natural Language

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Konsep dalam Teori Otomata dan Pembuktian Formal
Konsep dalam Teori Otomata dan Pembuktian Formal

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Composing Music with Grammars
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... Allows for infinite strings and null strings. Context-sensitive (type 1) – A α B → A β B. alpha produces beta in the context of A and B. α → Ø is forbidden. Context-free (type 2) – very useful with regards to natural language and programming. Good for representing multi-leveled syntactic formations ...
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Context-free grammar

In formal language theory, a context-free grammar (CFG)is a formal grammar in which every production rule is of the formV → wwhere V is a single nonterminal symbol, and w is a string of terminals and/or nonterminals (w can be empty). A formal grammar is considered ""context free"" when its production rules can be applied regardless of the context of a nonterminal. No matter which symbols surround it, the single nonterminal on the left hand side can always be replaced by the right hand side. This is what distinguishes it from a context-sensitive grammar.Languages generated by context-free grammars are known as context-free languages (CFL). Different context-free grammars can generate the same context-free language. It is important to distinguish properties of the language (intrinsic properties) from properties of a particular grammar (extrinsic properties). The language equality question (do two given context-free grammars generate the same language?) is undecidable.Context-free grammars arise in linguistics where they are used to describe the structure of sentences and words in natural language, and they were in fact invented by the linguist Noam Chomsky for this purpose, but have not really lived up to their original expectation. By contrast, in computer science, as the use of recursively defined concepts increased, they were used more and more. In an early application, grammars are used to describe the structure of programming languages. In a newer application, they are used in an essential part of the Extensible Markup Language (XML) called the Document Type Definition.In linguistics, some authors use the term phrase structure grammar to refer to context-free grammars, whereby phrase structure grammars are distinct from dependency grammars. In computer science, a popular notation for context-free grammars is Backus–Naur Form, or BNF.
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