Tài liệu Báo cáo khoa học: "Statistical Decision-Tree Models for Parsing*" ppt

... Multitext Grammars and Multitrees The algorithms in this paper can be adapted for any synchronous grammar formalism. The vehicle for the present guided tour shall be multitext grammar (MTG), which is ... attention to MTGs in Generalized Chomsky Normal Form (GCNF) (Melamed et al., 2004). This normal form allows simpler algorithm descriptions than the normal forms used by Wu (1997) and Mela...

Ngày tải lên: 20/02/2014, 16:20

... the prefix c-; for example: p–pos, p–form, c–pos, and c–form. In our model we use both word form and POS tag and include the composite form/POS features: p–form/c– pos and p–pos/c–form. Branch ... less- constrained models. An efficient algorithm for gen- erating the k-best parse trees for a constituency- based parser was presented in Huang and Chiang (2005); a variation of that algorithm...

Ngày tải lên: 20/02/2014, 12:20

... context in- formation at the sentence level, we adopt the topical context information in our method for the following reasons: (1) the topic informa- tion captures the context information beyond the ... 8-14 July 2012. c 2012 Association for Computational Linguistics Translation Model Adaptation for Statistical Machine Translation with Monolingual Topic Information ∗ Jinsong Su 1,2 , H...

Ngày tải lên: 19/02/2014, 19:20

... Gigaword corpus. Both language models are used for both tasks. We carried out experiments for translating Chinese to English. We use the same develop- ment and test sets for the two data conditions. ... (WSD) techniques in SMT for translation selection. However, WSD techniques for SMT do so indirectly, using source-side context to help select a particular translation for a s...

Ngày tải lên: 20/02/2014, 04:20

... Association for Computational Linguistics Statistical phrase-based models for interactive computer-assisted translation Jes ´ us Tom ´ as and Francisco Casacuberta Instituto Tecnol ´ ogico de Inform ´ atica Universidad ... framework (Och et al., 2003). Phrase-based models have proved to be very ad- equate statistical models for MT (Tom ´ as et al., 2005). In this work, the use of...

Ngày tải lên: 20/02/2014, 12:20

Ngày tải lên: 20/02/2014, 18:20

... otherwise. 2.3 Decision-Tree Algorithms The point of showing the equivalence between n- gram models and decision-tree models is to make clear that the power of decision-tree models is not in ... SPATTER's models SPATTER consists of three main decision-tree models: a part-of-speech tagging model, a node- extension model, and a node-labeling model. Each of these d...

Ngày tải lên: 20/02/2014, 22:20

... and then introduce three models for dependency parsing of Turkish. We then present our results for these models and for some addi- tional experiments for the best performing model. We then close ... subse- quent models. In Figure 5 we show in a table the sample sen- tence in Figure 3, the morphological analysis for each word and the reduced tags for representing the units f...

Ngày tải lên: 22/02/2014, 02:20

... model orders are 4-grams for the baseline system and 6-grams for the seg- mented Arabic. The average sentence length is 33 for English, 25 for non-segmented Arabic and 36 for segmented Arabic. To ... data size, we use a trigram LM for the baseline, and a 4-gram for segmented Arabic. In this case, the average sentence length is 9 for English, 8 for Ara- bic, and 10 for segm...

Ngày tải lên: 22/02/2014, 02:20

... incu- bated for 4 days with each of the peptides (10 lm), and cells were fixed and used for immunocytochemical analyses. Immunocytochemistry Neurons were fixed in 4% paraformaldehyde for 20 min at ... to transformed Ca 2+ -competent E. coli cells (ER2566) by heat shock. The transformed cells were spread on LB agar plates containing ampicillin (50 mgÆL )1 ), single colonies were picked fo...

Ngày tải lên: 18/02/2014, 13:20