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PARSING

PARSING. Analyzing Linguistic Units. Why should we parse a sentence? to detect relations among words used to normalize surface syntactic variations. invaluable for a number of NLP applications. Some Concepts. Grammar: A generative device that prescribes a set of valid strings.

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671 views • 51 slides

HLT

HLT. Sentence Parsing Algorithms 2 Problems with Depth First Top Down Parsing. Left Recursion Handling Ambiguity Inefficiency. Problems with DFTD Parser. Left Recursion. A grammar is left recursive if it contains at least one non-terminal A for which A ? * ?A? and ? ? * ?

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386 views • 22 slides

CFGs and PCFGs

CFGs and PCFGs. (Probabilistic) Context-Free Grammars. S ? NP VP VP ? V NP VP ? V NP PP NP ? NP NP NP ? NP P P NP ? N NP ? e PP ? P NP people fish tanks people fish with rods. N ? people N ? fish N ? tanks N ? rods V ? people V ? fish

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247 views • 14 slides

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Np pp np - PowerPoint PPT Presentation

PARSING

HLT

CFGs and PCFGs