Báo cáo khoa học: "Semantic Role Labeling Systems for Arabic using Kernel Methods" pptx

... 798–806, Columbus, Ohio, USA, June 2008. c 2008 Association for Computational Linguistics Semantic Role Labeling Systems for Arabic using Kernel Methods Mona Diab CCLS, Columbia University New York, ... proposed in previous work for automatic SRL of English texts is suitable for Arabic SRL systems, and (b) the impact of tree kernels using new tree structures on Arab...

Ngày tải lên: 31/03/2014, 00:20

... a noticeable effort has been devoted to the design of lexical resources that can provide the training ground for automatic se- mantic role labelers. Unfortunately, most of the systems developed ... frame infor- mation in the Senseval-3 competition (Litkowski, 2004) of FrameNet (Johnson et al., 2003) role la- beling task. When such information is not used by the systems, the performan...

Ngày tải lên: 08/03/2014, 02:21

... We use Sections 02-21 for training, Section 00 for development and Section 23 for testing. We formulate the semantic labeling problem as a multi-class classification problem using Support Vector ... 80303 {spradhan,whw,hacioglu,martin}@cslr.colorado.edu Daniel Jurafsky Department of Linguistics, Stanford University, Stanford, CA 94305 jurafsky@stanford.edu Abstract Semantic role l...

Ngày tải lên: 08/03/2014, 04:22

... case, we pass a semantic role label to a RE only in case the two phrases share the same head. Labels have the form “ARG 1 pred 1 . . . ARG n pred n ” for n semantic roles filled by a constituent, ... performance. Table 6 shows the per- formance variations obtained by leaving out each feature in turn. Again, it can be seen that remov- ing both I and J SEMROLE induces a relatively high perfo...

Ngày tải lên: 08/03/2014, 21:20

Ngày tải lên: 23/03/2014, 17:20

... With grammatical role labeling, for example, there is no way to explicitly express global constraints that, say, the verb “to give” must have 3 arguments of a particular grammatical role. Among the ... comprising all subcategorized roles of the verb but not nec- essarily forming a valid subcategorization frame of that verb at all. For example, the verb “to be- lieve” subcategorizes...

Ngày tải lên: 17/03/2014, 22:20

... translation systems might be used as the fundamental basis for cell-like systems. We review recent progress in the field of cell-free translation systems and describe their use as tools for pro- tein ... and high produc- tivity, proteins are prepared using in vivo gene expres- sion systems. However, the problems associated with using living cells for recombinant protein express...

Ngày tải lên: 19/02/2014, 06:20

... pattern discovery is more appropriate for our task because it allows for matching across patterns with permu- tations, for representation of wild cards and for use on smaller data sets. Similar ... decade (see (Hudak and McClure, 1999) for a recent sur- vey). Combinatorial pattern discovery, one tech- nique developed for this problem, promised to be a good fit for our task becaus...

Ngày tải lên: 20/02/2014, 18:20

... the transducer using the forward- backward algorithm on the current training set. 3. Calculate the forward score for all word pairs under consideration. 4. If the forward score for a pair of words ... unattractive for two reasons. Firstly, predicting all possible relationships between letters in English and Arabic is difficult. For example, allowances have to be made for un- usua...

Ngày tải lên: 08/03/2014, 02:21

... the performance, it remains unclear whether using only information from hand-crafted thesauri would help to improve the retrieval performance. Another way to improve retrieval performance using ... retrieval performance for all the data sets. For example, in trec7, it improves the per- formance from 0.186 to 0.216. As far as we know, none of the previous studies showed such significant...

Ngày tải lên: 17/03/2014, 02:20