Tài liệu Báo cáo khoa học: "A Fully Bayesian Approach to Unsupervised Part-of-Speech Tagging∗" docx

... Czech Republic, June 2007.c2007 Association for Computational LinguisticsA Fully Bayesian Approach to Unsupervised Part-of-Speech Tagging∗Sharon GoldwaterDepartment of LinguisticsStanford ... parameters.We show using part-of-speech tagging thata fully Bayesian approach can greatly im-prove performance. Rather than estimatinga single set of parameters, the Bayesian ap-proach integrates ... GriffithsDepartment of PsychologyUC Berkeleytomgriffiths@berkeley.eduAbstract Unsupervised learning of linguistic structureis a difficult problem. A common approach is to define a generative model and max-imize...

Tài liệu Báo cáo khoa học: "A Ranking-based Approach to Word Reordering for Statistical Machine Translation" doc

... converted to dependency trees us-ing Stanford Parser (Marneffe et al., 2006). We con-vert the tokens in training data to lower case, andre-tokenize the sentences using the same tokenizerfrom ... sensitive to parser er-rors; on the other hand, integrated model is forced to use a longer distortion limit which leads to moresearch errors during decoding time. It is possible to 918use ... work, we plan to extend the rankingmodel to handle reordering between multiple lev-els of source trees. We also expect to explore bet-ter way to integrate ranking reorder model into SMTsystem...

Tài liệu Báo cáo khoa học: "A Feature Based Approach to Leveraging Context for Classifying Newsgroup Style Discussion Segments" pptx

... state of a simple finite-state automaton that only has two states. The automaton is set to initial state (q0) at the top of a message. It makes a transition to state (q1) when it encounters ... is to enable the quality and nature of discussions that occur within an on-line discussion board to be communicated in a summary to a potential new-comer or group moderators. We propose to ... where a message appears. We refer to this feature as deep. This is expected to improve per-formance to the extent that thread initial messages may be rhetorically distinct from messages that...

Tài liệu Báo cáo khoa học: "An All-Subtrees Approach to Unsupervised Parsing" pdf

... approach to unsupervised parsing. Unsupervised DOP models assignall possible binary trees to a set of sentencesand next use (a large random subset of) allsubtrees from these binary trees to ... extends DOP1 to unsupervised parsing(Bod 2006). Its key idea is to assign all unlabeledbinary trees to a set of sentences and to next use (inprinciple) all subtrees from these binary trees to parse ... extension to wordstrings is straightforward as there exist highlyaccurate unsupervised part-of-speech taggers (e.g.Schütze 1995) which can be directly combined with unsupervised parsers. To give...

Báo cáo khoa học: "A Nonparametric Bayesian Approach to Acoustic Model Discovery" docx

... thefuture, we plan to explore phonological context anduse more flexible topological structures to modelacoustic units within our framework.AcknowledgementsThe authors would like to thank Hung-an ... Computational LinguisticsA Nonparametric Bayesian Approach to Acoustic Model DiscoveryChia-ying Lee and James GlassComputer Science and Artificial Intelligence LaboratoryMassachusetts Institute of TechnologyCambridge, ... used to representacoustic units. Instead of discovering repetitive pat-terns first, our model is able to learn from any givendata. Unsupervised Speech Segmentation One goalof our model is to...

Tài liệu Báo cáo khoa học: A systems biology approach for the analysis of carbohydrate dynamics during acclimation to low temperature in Arabidopsis thaliana doc

... a tool forpredicting metabolic engineering strategies to optimize plant freezing toler-ance. We confirm that a significant improvement in freezing tolerance inplants involves multiple regulatory ... demonstrated this [12]. However, it was shownthat fully cold-acclimated transformants of C24 didnot differ from the wild type with regard to freezingtolerance and, at the same time, differences ... respect to the dynamics of freezing tolerancerevealed a significant correlation of sucrose synthesisand degradation with the process of cold acclimation.We conclude that acclimation to low temperature...

Tài liệu Báo cáo khoa học: "A Method for Measuring Machine Translation Conﬁdence" docx

... Moreover, wealso intend to perform a user study on our visualiza-tion prototype to see if it increases the productivity ofpost-editors.AcknowledgementsWe would like to thank Christoph Tillmann and ... conﬁdence score, extend it to the sentence level, then apply it to n-best list rerankingtask to improve MT quality, and ﬁnally design a vi-sualization prototype. We try to answer the followingquestions:• ... framework.These features include source -to- target phrase transla-tion score, source -to- target and target -to- source word- to- word translation scores, language model score, dis-tortion model scores and word...

Tài liệu Báo cáo khoa học: "A Gibbs Sampler for Phrasal Synchronous Grammar Induction" docx

... solu-tion to the modelling and scaling problems ofprevious approaches. We describe our Bayesian SCFG model in Section 4 and a Gibbs sampler to explore its posterior. We apply this sampler to build ... Figure 4. Theupdate equations are analogous to those used forthe Split/Join operator in Figure 3. In order for thisoperator to be effective we need to allow greaterthan binary branching nodes, ... fundamental to their success.In this paper we present a novel SCFG transla-tion model using a non-parametric Bayesian for-mulation. The model includes priors to impose abias towards small...

Tài liệu Báo cáo khoa học: "A Finite-State Model of Human Sentence Processing" docx

... approximation to the jointprobability.Lastly, re-ranking of POS sequences is expected to predict reanalysis of lexical categories. This isbecause re-ranking in the tagger is parallel to re-analysis ... disambiguating word, to com-pared to “on”.4.3 Probability Re-rankingThe probability re-ranking reported in Corley andCrocker (2000) was replicated. The tagger suc-cessfully resolved the ambiguity ... degree. The current study providesmore concrete answers to what ﬁnite state machineis relevant to what kinds of processing difﬁcultyand to what extent.6 Future WorkEven though comparative analysis...

Tài liệu Báo cáo khoa học: "A Limited-Domain English to Japanese Medical Speech Translator Built Using REGULUS 2" doc

... on the other. We propose to demon-strate a prototype system instantiating thisarchitecture, which has been built on topof the Open Source REGULUS 2 platform.The prototype translates spoken ... Translator (Rayner et al., 2000a)).At run-time, the system behaves essentially like aphrasal translator which allows some variation in theinput language. This is close in spirit to the approach used ... yes-noquestions about headache symptoms fromEnglish to Japanese, using a vocabulary ofabout 200 words.1 Introduction and motivationLanguage is crucial to medical diagnosis. Dur-ing the initial...

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