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

... learned sub-word models to guideits hypotheses on phone boundaries. Bayesian Model for Segmentation Our model isinspired by previous applications of nonparametric Bayesian models to segmentation ... nonparametric Bayesian model. More speciﬁcally, we formulate a Dirichlet pro-cess mixture model where each mixture is a Hid-den Markov Model (HMM) used to model a sub-word unit and to generate ... Computational LinguisticsA Nonparametric Bayesian Approach to Acoustic Model DiscoveryChia-ying Lee and James GlassComputer Science and Artiﬁcial Intelligence LaboratoryMassachusetts Institute...

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

... available. Luckily, the Bayesian approach allows us to automatically select valuesfor the hyperparameters by treating them as addi-tional variables in the model. We augment the model with priors ... concludes.2 A Bayesian HMM2.1 MotivationIn model- based approaches to unsupervised lan-guage learning, the problem is formulated in termsof identifying latent structure from data. We de-ﬁne a model ... lan-guage. Our model has the structure of astandard trigram HMM, yet its accuracy iscloser to that of a state-of-the-art discrimi-native model (Smith and Eisner, 2005), up to 14 percentage...

Báo cáo khoa học: "A Machine Learning Approach to German Pronoun Resolution" docx

... for German, we were able to obtain thesystem submitted by (Curran and Clark, 2003) to the 2003 CoNLL competition. In order to run therecogniser, the data needs to be tokenised, taggedand lemmatised, ... sec-tion, (Morton, 2000) does not use a decision treealgorithm but opts instead for a maximum entropy model. The model is trained on a subset of theWall Street Journal, comprising 21 million tokens.The ... a novel ensemblelearning approach to resolving Germanpronouns. Boosting, the method inquestion, combines the moderately ac-curate hypotheses of several classiﬁers to form a highly accurate...

Báo cáo khoa học: "a Context-Aware Approach to Lexical Simpliﬁcation" docx

... would want to apply it to a sentence such as “In 1368 Han rebelsdrove out the Mongols”, but to avoid applying it to a sentence like “The history of the Han ethnic groupis closely tied to that ... infor-mation within a 10-token window. Each dimensioni in the vector corresponds to a single word wiinthe vocabulary, and a single dimension was added to represent any number token. The value in ... andsummarization (Blake et al., 2007). Automated sim-pliﬁcation can also be considered as a way to helpend users access relevant information, which wouldbe too complex to understand if left unedited....

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

... soft constraints to encourage the decoder to choose translations withword order similar to the prediction of ranking re-order model. 5 Experiments To test our ranking reorder model, we carry ... 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 ... ranking-based ap-proach to word reordering. The ranking model isautomatically derived from the word aligned paralleldata, viewing the source tree nodes to be reorderedas list items to be ranked. The...

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...

Báo cáo khoa học: "A Two-step Approach to Sentence Compression of Spoken Utterances" pdf

... ﬁrst step, 8 anno-tators were asked to select words to be removed to compress the sentences. In the second step, 6 an-notators (different from the ﬁrst step) were asked to pick the best one ... applies noisy-channel model and decision tree approaches on this prob-lem. (Galley and Mckeown, 2007) proposes to use asynchronous context-free grammars (SCFG) basedmethod to compress the sentence. ... propose to use a two-step approach in this pa-per for sentence compression of spontaneous speechutterances. The contributions of our work are:• Our proposed two-step approach allows us to incorporate...

Báo cáo khoa học: "A Syntax-Free Approach to Japanese Sentence Compression" potx

... Syntax-Free Approach to Japanese Sentence CompressionTsutomu HIRAO, Jun SUZUKI and Hideki ISOZAKINTT Communication Science Laboratories, NTT Corp.2-4 Hikaridai, Seika-cho, Soraku-gun, Kyoto 619-0237 ... alternative to these tree trimmingapproaches, sequence-oriented approaches havebeen proposed (McDonald, 2006; Nomoto, 2007;Hori and Furui, 2003; Clarke and Lapata, 2006).Nomoto (2007) and ... learningframework.3.2.2 Patched Language Model Many studies on sentence compression employ then-gram language model to evaluate the linguisticlikelihood of a compressed sentence. However,this model is usually computed...

Báo cáo khoa học: "A Noisy-Channel Approach to Question Answering" docx

... “legal” is related to “rule”, which in turn is related to “mandatory”; that “age” is related to “aged”; and that “Argentine” is related to “Argentina”. It is not difficult to see by now that ... noisy channel model for QA. This model explains how a given sentence SA that contains an answer sub-string A to a question Q can be rewritten into Q through a sequence of stochastic operations. ... the full-blown Model 4 statistical model described by Brown et al. generative story. That is, we assumed that it is equally likely to take any cut in the tree and equally likely to choose as...

Báo cáo khoa học: "A multi-staged approach to identifying complex events in textual data" ppt

... layoff. A second concern is thus to enable end users to interpret facts and eventsthrough automated context assessment.The route we have taken towards this end is to model the domain of corporate ... as tailored to the financial do-main, and some forward-looking exten-sions to the approach that enables users to specify classifications on the fly.1 IntroductionOur goal is to support the ... trainingBecause we had no existing methods to addressfinancial events or relations, we took this oppor-tunity to develop a trainable approach. Recentwork has begun to address relation and eventextraction...

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