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 AFNLP A Generative Blog Post Retrieval Model that Uses Query Expansion based on External Collections Wouter Weerkamp w.weerkamp@uva.nl Krisztian Balog k.balog@uva.nl ISLA, ... generated content environment, the blogosphere, we apply a form of query expansion, i.e., adding and reweighing query terms. Since the blogosphere...

Ngày tải lên: 30/03/2014, 23:20

... from the conditional model used for induction. Here, we improve on that model in several ways. First, we construct a generative model which utilizes the same features. Then, we extend the model to ... funda- mental assumption is a much weakened version of classic linguistic constituency tests (Radford, 1988): constituents appear in constituent contexts. A par- ticular linguistic...

Ngày tải lên: 17/03/2014, 08:20

... 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. 946 2 The Generative Entity-Mention Model for Entity Linking In this section we describe the generative entity- mention mod...

Ngày tải lên: 23/03/2014, 16:20

... 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 (...

Ngày tải lên: 23/03/2014, 19:20

... 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...

Ngày tải lên: 24/03/2014, 05:21

... normalization. Notation Normalization n (none) 1 c (cosine) 1 √ w 2 1 +w 2 2 + +w 2 n Significant research has been done in IR on di- verse weighting functions and not all versions of SMART notations are consistent ... docu- ments of only one or the other class and therefore df i,j = 0 . 3.3 SMART and BM25 tf.idf variants The SMART retrieval system by Salton (1971) is a retrieval system...

Ngày tải lên: 20/02/2014, 04:20

... compression ratio for the pointer 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 to represent the N-gram language model structure based on LOUDS (Jacobson, 1989; Delpratt et al., 2006). It was first introduced by Ja...

Ngày tải lên: 20/02/2014, 09:20

... first-pass models and their log-linear combination, described in Section 4. We can see that the combination of the language model and the local tree order model outperformed either model by a ... compare 14 First-pass models Model BLEU 1 best 30 best Lang Model (Permutations) 58.8 71.2 Lang Model (TargetProjective) 83.9 95.0 Local Tree Order Model 75.8 87.3 Local Tree Order Mo...

Ngày tải lên: 20/02/2014, 12:20

... the same conditions that were used for RT-PCR over 35 cycles. Additionally, PCR reactions without template were set up to exclude contamination with other PCR components. In none of the controls ... transcription level and induction by chitin, R. solani cell walls and carbon starvation, but was only moderately transcribed in confrontation assays. Transcription of chi18-5 was even stronger w...

Ngày tải lên: 07/03/2014, 12:20

... queries exactly one basedata element (i.e. word) or one markable. 3.1 Query Tokens Basedata 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 Linguistics A Flexible Stand-Off Data Model with Query Language...

Ngày tải lên: 08/03/2014, 04:22