Read e-book online Coarse-to-Fine Natural Language Processing PDF

By Slav Petrov (auth.)

ISBN-10: 3642227422

ISBN-13: 9783642227424

The influence of desktops that may comprehend typical language may be large. To advance this strength we have to be capable of immediately and successfully research quite a lot of textual content. Manually devised ideas are usually not adequate to supply assurance to deal with the advanced constitution of common language, necessitating structures which may immediately study from examples. to deal with the pliability of usual language, it has turn into normal perform to exploit statistical versions, which assign chances for instance to different meanings of a note or the plausibility of grammatical constructions.

This booklet develops a common coarse-to-fine framework for studying and inference in huge statistical types for usual language processing.

Coarse-to-fine methods take advantage of a series of types which introduce complexity progressively. on the most sensible of the series is a trivial version during which studying and inference are either affordable. every one next version refines the former one, till a last, full-complexity version is reached. purposes of this framework to syntactic parsing, speech acceptance and computer translation are provided, demonstrating the effectiveness of the strategy when it comes to accuracy and velocity. The booklet is meant for college students and researchers attracted to statistical ways to traditional Language Processing.

Slav’s work Coarse-to-Fine traditional Language Processing represents a huge enhance within the sector of syntactic parsing, and a good commercial for the prevalence of the machine-learning approach.

Eugene Charniak (Brown University)

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Additional resources for Coarse-to-Fine Natural Language Processing

Example text

7 times more likely than an object NP to expand as just a pronoun. Having separate symbols for subject and object NPs allows this variation a RB Not b FRAG . NP DT NN this year . c ROOT FRAG RB Not NP DT NN this year d ROOT ROOT FRAGˆROOT FRAG FRAG-x . FRAGˆROOT . RB-U . -x FRAG-x RB-x Not NP-x DT-x NN-x this year . Fig. 1 The original parse tree (a) gets binarized (b), and then either manually annotated (c) or refined with latent variables (d) 1 Note that in parsing with the unsplit grammar, not having seen a rule doesn’t mean one gets a parse failure, but rather a possibly very weird parse (Charniak 1996).

Additionally we project to a grammar G 1 in which all nonterminals, except for the preterminals, have been collapsed. During parsing, we start of by exhaustively computing the inside/outside scores with G 1 . i 1 to map between grammar categories in Gi and Gi 1 . In each pass, we skip chart items whose projection into the previous stage had a probability below a stage-specific threshold, until we reach G D Gn (after seven passes in our case). For G, we do not prune but instead return the minimum risk tree, as will be described in Sect.

In fact, extra subcategories may need to be added to several nonterminals before they can cooperate to pass information along the parse tree. Therefore, we go in the opposite direction; that is, we split every category in two, train, and then measure for each subcategory the loss in likelihood incurred when removing it. 3 Generative Latent Variable Grammars 17 removed. 4 Let T be a training tree generating a sentence w. r; t/ with the label A; that is, the subtree rooted at n generates wrWt and has the label A.

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Coarse-to-Fine Natural Language Processing by Slav Petrov (auth.)

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