Báo cáo khoa học: "A Hierarchical Pitman-Yor Process HMM for Unsupervised Part of Speech Induction" doc

... Hierarchical Pitman-Yor Process HMM for Unsupervised Part of Speech InductionPhil BlunsomDepartment of Computer ScienceUniversity of OxfordPhil.Blunsom@cs.ox.ac.ukTrevor CohnDepartment of Computer ... translation systems.The HMM ignores orthographic information,which is often highly indicative of a word’s part- of- speech, particularly so in morphologically richlanguages. For this reason Clark ... USA. Association for ComputationalLinguistics.Sujith Ravi and Kevin Knight. 2009. Minimized models for unsupervised part- of- speech tagging. In Proceed-ings of the Joint Conferenceof the 47th Annual...

Báo cáo khoa học: "A Hierarchical Phrase-Based Model for Statistical Machine Translation" pptx

... 2: A selection of extracted rules, with ranksafter ﬁltering for the development set. All have X for their left-hand sides.5.2 Hierarchical modelWe ran the training process of Section 3 on ... represent D as a set of triplesr, i, j, each of which stands for an application of a grammar rule r to rewrite a nonterminal that spansf(D)jion the French side.3Then the weight of D2This feature ... standing for X spanning fji. We choose b and β to balancespeed and performance on our development set. For our experiments, we set b = 40, β = 10−1 for X cells,and b = 15, β = 10−1 for S...

Báo cáo khoa học: "A Generalized-Zero-Preserving Method for Compact Encoding of Concept Lattices" pot

... intersection of the sets that formed the in-put. So it seems natural to embed a partial order of types X,  into a partial order (in fact, a lattice) of sets Y, , where Y is the power set of someset ... second partial order, we use  for its orderrelation and  for its join operation. We are espe-cially interested in a class of partial orders calledmeet semilattices, in which every pair of elementshas ... contain thou-sands of types. We use binary constraints be-tween every pair of types, for a total of millions of constraints—and these are variables and con-straints over a domain of sets, not integers...

Báo cáo khoa học: "A Cascaded Finite-State Parser for Syntactic Analysis of Swedish" potx

... consists of a se- quence of strata, each stratum being de- fined by a set of regular-expression pat- terns for recognizing phrases. [ ] The output of stratum 0 consists of parts of speech. ... semantics and part- of- speech used in the input, as well as the head of each phrase and the grammatical functions: TIME, SUBJ(ect) and P-0BJ(ect). 4 Evaluation The performance of the parser partly ... parser partly depends on the output of the tagger and the rest of the pre- processing software. Our way of dealing with how "correct" the performance of the parser is, follows a practical,...

Báo cáo khoa học: "A Generative Entity-Mention Model for Linking Entities with Knowledge Base" doc

... encoded in the distribution of entities in document P(e), the distribution of possible names of a specific entity P(s|e), and the distribution of possible contexts of a specific entity P(c|e). ... Association for Computational LinguisticsA Generative Entity-Mention Model for Linking Entities with Knowledge Base Xianpei Han Le Sun Institute of Software, Chinese Academy of Sciences HaiDian ... BaseEmployer -of IS-AIS-A IS-AIS-AIS-A Part- of JordanBulls Figure 1. A Demo of Entity Linking A key issue in bridging the knowledge base with the textual data is linking the entities in a document...

Tài liệu Báo cáo khoa học: "A Hierarchical Account of Referential Accessibility" pptx

... providing for ato be on the stack when b is processed. (2) A2. Some of the executives also signed letters onbehalf of the Clinton program.B2. Nearly all of them praised the president for his efforts ... A Hierarchical Account of Referential AccessibilityNancy IDEDepartment of Computer ScienceVassar CollegePoughkeepsie, New York 12604-0520 USAide@cs.vassar.eduDan CRISTEADepartment of ... requiressignificantly less effort for DRAs of any size.We use a similar strategy here to compute theeffort required by VT and stack-based models.DRAs for both models are treated as orderedlists. For example,...

Báo cáo khoa học: "A Hierarchical Model of Web Summaries" docx

... manually created document ontology tomodel the content of an underlying document col-lection. While the primary usage of ontologies isas a means of organizing and navigating documentcollections, ... signif-icant amount of information about the documentsattached to them, including path-level, statistical,representations of content, and ﬁne-grained viewson the level of speciﬁcity of the language ... of word wiin topic Tk, as:P (wi|Tk) =nCk(wi)nCk(6)with nCk(wi) the total number of occurrence of wiin documents under Ck, and nCkthe total number of words in documents...

Báo cáo khoa học: "A Hierarchical Bayesian Language Model based on Pitman-Yor Processes" docx

... observed, most of them rarely. In particular, for a vocabulary of un-bounded size and for d > 0, the number of uniquewords scales as O(θTd) where T is the total num-ber of words. For d = 0, ... levels of the model.4 Hierarchical Chinese RestaurantProcessesWe describe a generative procedure analogousto the Chinese restaurant process of Section 2 for drawing words from the hierarchical ... calcu-late for each of I samples.The hierarchical Pitman-Yor language modelproduces discounts that grow gradually as a func-tion of n-gram counts. Notice that although each Pitman-Yor process...

Báo cáo khoa học: "A Joint Rule Selection Model for Hierarchical Phrase-based Translation" pptx

... Previouswork mainly focused on the selection of either the source side of a hierarchical ruleor the target side of a hierarchical rulerather than considering both of them si-multaneously. This paper ... function words, part- of- speech (POS) tags, syntactic structure in-formation and so on. Our model can be easily in-corporated as an independent feature into the prac-tical hierarchical phrase-based ... andcomplicated task for hierarchical phrase-basedSMT system. We propose a joint probabilitymodel for the hierarchical rule selection and theexperimental results prove the effectiveness of ourapproach.In...

Báo cáo khoa học: "A Hierarchical Approach to Encoding Medical Concepts for Clinical Notes" docx

... shows a hierarchical TC system has achieved a micro-averaged F1value of 86.6, which is compara-ble to the performance of state -of- the-art ﬂatclassiﬁcation systems.1 IntroductionThe task of ... F4 has lowered the performance of the system.However, adding F3 and F4 into bag -of- words fea-ture set has improved the performance of both sys-tems. Finally, the best performance were reportedon ... disagreement between the prediction of the sys-tem and the gold-standard annotation of the trainingdata set. This has improved the performance of thesystem to a F1value of 89. Goldstein et al. (2007)also...

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