Ai Machine Learning

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

By Slav Petrov (auth.)

The influence of computers which could comprehend traditional language can be super. To advance this power we have to manage to instantly and successfully study quite a lot of textual content. Manually devised principles will not be adequate to supply assurance to deal with the advanced constitution of usual language, necessitating structures that could immediately research from examples. to deal with the pliability of typical language, it has turn into common perform to exploit statistical versions, which assign chances for instance to the various meanings of a be aware or the plausibility of grammatical constructions.

This publication develops a normal coarse-to-fine framework for studying and inference in huge statistical versions for typical language processing.

Coarse-to-fine methods take advantage of a series of versions which introduce complexity progressively. on the best of the series is a trivial version within which studying and inference are either affordable. each one next version refines the former one, until eventually a last, full-complexity version is reached. purposes of this framework to syntactic parsing, speech reputation and desktop translation are provided, demonstrating the effectiveness of the technique by way of accuracy and pace. The publication is meant for college students and researchers drawn to statistical techniques to normal Language Processing.

Slav’s work Coarse-to-Fine ordinary Language Processing represents an incredible boost within the zone of syntactic parsing, and a very 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

Sample text

The simplest option is to sample trees T from G, project the samples, and take average counts off of these samples. In the limit, the counts will converge to the desired expectations, provided the grammar is proper. However, we can exploit the structure of our projections to obtain the desired expectations much more simply and efficiently. First, consider the problem of calculating the expected counts of a category A in a tree distribution given by a grammar G, ignoring the issue of projection.

Unlike EM, however, the algorithm is able to take the uncertainty of parameters into account and thus incorporate the DP prior. On synthetic data, our HDP-PCFG can recover the correct grammar without having to specify its complexity in advance. We also show that our HDP-PCFG can be applied to full-scale parsing applications and demonstrate its effectiveness in learning latent variable grammars. For limited amounts of training data, the HDPPCFG learns more compact grammars than our split-merge approach, demonstrating the strengths of the Bayesian approach.

The grammars recover patterns like those discussed in Klein and Manning (2003a), heavily articulating complex and frequent categories like NP and VP while barely splitting rare or simple ones (see Sect. 6 for an empirical analysis). Empirically, hierarchical splitting increases the accuracy and lowers the variance of the learned grammars. Another contribution is that, unlike previous work, we investigate smoothed models, allowing us to refine grammars more heavily before running into the oversplitting effect discussed in Klein and Manning (2003a), where data fragmentation outweighs increased expressivity.

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