Báo cáo khoa học: "A Generative Blog Post Retrieval Model that Uses Query Expansion based on External Collections" potx

... Singapore, 2-7 August 2009.c2009 ACL and AFNLPA Generative Blog Post Retrieval Model that Uses Query Expansion based on External CollectionsWouter Weerkampw.weerkamp@uva.nlKrisztian Balogk.balog@uva.nlISLA, ... generatedcontent environment, the blogosphere, weapply a form of query expansion, i.e.,adding and reweighing query terms. Sincethe blogosphere is noisy, query expansion on the collection itself ... research questions:(i) Can we effectively apply external expansion inthe retrieval of user generated content? (ii) Doesconditioning the external collection on the query help improve retrieval performance?...

Báo cáo khoa học: "A Generative Constituent-Context Model for Improved Grammar Induction" docx

... fromthe conditional model used for induction. Here, weimprove on that model in several ways. First, weconstruct a generative model which utilizes the samefeatures. Then, we extend the model to ... funda-mental assumption is a much weakened version ofclassic linguistic constituency tests (Radford, 1988):constituents appear in constituent contexts. A par-ticular linguistic phenomenon that the system ... not label constituents.An advantage to having only a single constituentclass is that it encourages constituents of one type tobe found even when they occur in a context whichcanonically holds...

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

... entity context models To estimate the distribution P(c|e), we propose a method based on language modeling, called entity context model. In our model, the context of each name mention m is ... in Section 5. Finally we conclude this paper in Section 6. 9462 The Generative Entity-Mention Model for Entity Linking In this section we describe the generative entity-mention model. We ... entry in the dictionary. 3 Model Estimation Section 2 shows that the entity mention model can decompose the entity linking task into the estimation of three distributions P(e), P(s|e) and...

Báo cáo khoa học: "A Generative Lexicon Perspective for Adjectival Modification" potx

... acquisition of conceptual descriptions Some on- line resources and dictionaries may effi- ciently contribute to this task. We have consid- ered several mono- and bi-lingual dictionaries in ... perspective, one of the most innovative is the Generative Lexi- con (GL) (Pustejovsky 91, 95) which introduces an abstract model opposed to sense enumeration lexi- cons. The GL is based (1) on the ... in the Qualia. [t is the constraint on the type of Y that restricts the application of that semantic com- position rule. This notation is particularly simple and convenient. Metaphors are...

Báo cáo khoa học: "A GENERATIVE GRAMMAR APPROACH FOR THE MORPHOLOGIC AND MORPHOSYNTACTIC ANALYSIS OF ITALIAN" ppt

... lexicon are strictly combined; for this reason this lexicon does not contain semanlic information. In the approach of Alinei [4], on the contrary, lexicon structures contain semantic information ... necessary to know that in is a preposition, such is an adjective, a an article, and so on: the only useful information is that this sequence takes the role of conjunction. Other fixed sequences ... this way, for example, the user knows that coton-~eio (cotton-mill) and coton-iera are two well-formed Italian words, but that only the first one is commonly used. The morphosyntactic analyzer...

Tài liệu Báo cáo khoa học: "A study of Information Retrieval weighting schemes for sentiment analysis" doc

... normalization.Notation Normalizationn (none) 1c (cosine)1√w21+w22+ +w2nSignificant research has been done in IR on di-verse weighting functions and not all versions ofSMART notations are consistent ... docu-ments of only one or the other class and thereforedfi,j= 0 .3.3 SMART and BM25 tf.idf variantsThe SMART retrieval system by Salton (1971) isa retrieval system based on the vector space model (Salton ... weights and others. They con-cluded that sentiment classification is more dif-ficult that standard topic -based classification and that using a SVM classifier with binary unigram- based features produces...

Tài liệu Báo cáo khoa học: "A Succinct N-gram Language Model" ppt

... compression ratio for thepointer table alone. Block compression employed on raw 4-byte pointers attained a large reduc-tion that was almost comparable to sorted inte-ger compression. Since ... representation.In this work, we propose a succinct way torepresent the N-gram language model structure based on LOUDS (Jacobson, 1989; Delpratt etal., 2006). It was first introduced by Jacobson(1989) ... basic operation on the bit string.sel1(i) returns the position of the i-th 1.Wecanalso define similar operations over zero bit strings,sel0(i).Givenselb, we define two operations fora node...

Tài liệu Báo cáo khoa học: "A Discriminative Syntactic Word Order Model for Machine Translation" pdf

... ﬁrst-pass models and theirlog-linear combination, described in Section 4. Wecan see that the combination of the language model and the local tree order model outperformed either model by a ... compare14First-pass models Model BLEU1 best 30 bestLang Model (Permutations) 58.8 71.2Lang Model (TargetProjective) 83.9 95.0Local Tree Order Model 75.8 87.3Local Tree Order Model + Lang Model 92.6 ... or-der model. An advantage of such a model is that wecan easily combine different kinds of features (suchas syntax -based and surface -based) , and that we canoptimize the parameters of our model...

Báo cáo khoa học: A complete survey of Trichoderma chitinases reveals three distinct subgroups of family 18 chitinases potx

... the same conditions that were used forRT-PCR over 35 cycles. Additionally, PCR reactionswithout template were set up to exclude contaminationwith other PCR components. In none of the controls ... transcription leveland induction by chitin, R. solani cell walls and carbonstarvation, but was only moderately transcribed inconfrontation assays. Transcription of chi18-5 waseven stronger when ... BC,before contact; CT, contact; AC, after contact; and H. atroviridisalone on plates (control, P1). The tef1 gene encoding translationelongation factor 1-alpha was used as a control and the...

Báo cáo khoa học: "A Flexible Stand-Off Data Model with Query Language for Multi-Level Annotation" ppt

... queries exactly one basedata element(i.e. word) or one markable.3.1 Query TokensBasedata elements can be queried by matching reg-ular expressions. Each basedata query token con-sists of a ... ACL Interactive Poster and Demonstration Sessions,pages 109–112, Ann Arbor, June 2005.c2005 Association for Computational LinguisticsA Flexible Stand-Off Data Model with Query Languagefor ... value pn, granted that there is ex-actly one nominal attribute with the possible valuepn. Several conditions can be combined into one query token. Thus, the query /{poss det,pron},!coref class=emptyreturns...

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