Báo cáo khoa học: "Mildly Non-Projective Dependency Structures" potx

... the to category as a dependency relation (Marks is a “subject” of to), since our philosophy at this stage is to encode every argument as a dependency, where possible. The number of dependency types ... that the probability of a dependency only depends on those words involved in the dependency, together with their categories. We follow Collins and base the estimate of a dependency p...

Ngày tải lên: 31/03/2014, 06:20

... Dependency Grammar These factors are exactly the same that make depen- dency parsing for free word order languages diffi- cult, and it seems worthwhile to see whether op- timized parsers for dependency ... can be translated back to cor- rect dependency trees. But for efficiency, the parser uses additional propagators tailored to the specific inferences of the dependency problem. For inst...

Ngày tải lên: 08/03/2014, 07:20

... Japan {dk, uchimoto}@nict.go.jp Abstract Dependency structures do not have the infor- mation of phrase categories in phrase struc- ture grammar. Thus, dependency parsing relies heavily on the ... lexicalization in dependency parsing. Specifically, by re- stricting the degree of lexicalization in the training phase of a parser, we examine the change in the accuracy of dependency re- lat...

Ngày tải lên: 23/03/2014, 18:20

Ngày tải lên: 31/03/2014, 18:20

... representational adequacy with respect to two dependency treebanks: the Prague Dependency Treebank (PDT) (Haji ˇ c et al., 2001), and the Danish Dependency Treebank (DDT) (Kromann, 2003). The ... projection of i: the yield of i, arranged in ascending order. 2.1 Dependency forests Most of the literature on dependency grammar and dependency parsing does not allow arbitrary de- pende...

Ngày tải lên: 08/03/2014, 02:21

... h01212ii hc; h0ii he; h0; 1ii hf; h0ii hb; h01; 1ii hd; h1; 0ii Figure 2: A non-projective dependency structure Blocks In a non-projective dependency structure, the yield of a node may be spread out over ... in the number of nodes of the dependency structure or order-annotated tree. 3.2 Non-projective structures It is straightforward to see that our representation of dependency...

Ngày tải lên: 17/03/2014, 04:20

... data-driven dependency parsing is the treatment of discontinuous syntactic constructions, usually modeled by non-projective dependency trees, as illustrated in Figure 1. In a projective dependency ... (Nivre, 2008a), unless restricted to a subset of non-projective structures as in Attardi (2006) and Nivre (2007). But allowing non-projective dependency trees also makes parsing em...

Ngày tải lên: 20/02/2014, 07:20

... searching the space of non-projective dependency trees, which is considerably larger than the space of projective dependency trees, would yield poor performance. That is not the case: dependency accuracy ... case of non-projective dependency parsing, we need to maintain additional information for each word x j of the partial translation x: • a predicted POS tag t j ; • a dependen...

Ngày tải lên: 20/02/2014, 07:20

Ngày tải lên: 20/02/2014, 09:20

... the finite-state dependency parser for Turkish by Oflazer (2003). This is in contrast to dependency treebanks, e.g. Prague Dependency Treebank (Haji ˇ c et al., 2001b), Danish Dependency Treebank ... ☎ Adv Z: . .) ✞ ☎ ❄ AuxZ Figure 1: Dependency graph for Czech sentence from the Prague Dependency Treebank 1 There exist a few robust broad-coverage parsers that produce non-projective...

Ngày tải lên: 20/02/2014, 15:20