Báo cáo khoa học: "Boosting-based parse reranking with subtree features" docx

... can use the all-subtrees repre- sentation without loss of efficiency. 3 RankBoost with subtree features A simple question related to kernel-based parse reranking asks whether all subtrees are really ... boost- ing for parse reranking. Several parsers have been proposed that utilize the all-subtrees representa- tion (e.g., tree kernel and data oriented parsing). This paper argues tha...

Ngày tải lên: 08/03/2014, 04:22

... authors also justified their method by showing that with feature hashing, dot- product is unbiased, and the length of each vector is well-preserved with high probability under some conditions. Plausibly ... explain in detail. In NLP, features can be often expediently expressed with strings. For in- stance, a feature ‘the current word ends with -ing’ can be expressed as a string cur:end...

Ngày tải lên: 20/02/2014, 05:20

... jump conjoined with an indicator feature for the target length n, the dis- cretized jump feature conjoined with the class of s a j , and the discretized jump feature conjoined with the class ... California. K. Gimpel and N. A. Smith. 2009. Cube summing, ap- proximate inference with non-local features, and dy- namic programming without semirings. In Proc. of EACL. N. Habash and F. Sada...

Ngày tải lên: 17/03/2014, 00:20

... allows a subject NP to com- bine with a transitive verb before the verb has com- bined with its object. In (3b), a sentence em- bedding verb is composed with a raised subject NP. Note that ... anything that can be proven with x can equivalently be proven with y. (16) x y X 0 Z Normalisation and the Dependency Calculus These efficiency problems for parsing with the DC ca...

Ngày tải lên: 17/03/2014, 08:20

... argument are added with prefix “lc:”. Similarly the two words to the right of the destination arguments are added with prefix “rc:”. Each document in the NYT corpus is associated with many descriptors, ... pattern senses, we merge them into clusters of different patterns with a similar sense. We employ hierarchical agglomerative clustering with a similarity metric that considers featu...

Ngày tải lên: 23/03/2014, 14:20

... VBZ. is . WHNP. WP. who (a) (b) Figure 2: English parse tree with empty elements marked. (a) As annotated in the Penn Treebank. (b) With empty elements reconfigured and slash categories added. where ... 终止 zhōngzhǐ suspend . ADVP. AD. 暂时 zànshí for now . NP. NONE *pro* Figure 1: Chinese parse tree with empty elements marked. The meaning of the sentence is, “Implementat...

Ngày tải lên: 23/03/2014, 16:20

... is associated with a feature structure of its own. What is meant by 'rule features are satisfied'? Regular grammars which make use of rule features normally interact with a lexicon. ... triggered, [cat=verb] of the rule must match with [cat=verb] of the lexical entry {clvc2vc3}, and [measure=pa"el] of the rule must match with [measure=(p'al,pa"el)] of...

Ngày tải lên: 24/03/2014, 03:21

... terministic parser applies a sequence of parse actions to the parse structure. The most frequent parse ac- tions are shift, which shifts a frame from the input list onto the parse stack or ... Figure 1: Example of a parse action (simplified); boxes represent frames The central data structure for the parser consists of a parse stack and an input list. The parse stack and...

Ngày tải lên: 22/02/2014, 03:20

... allosteric DNAzyme with dual RNA-cleaving and DNA-cleaving activities is very challenging. We used an in vitro-selected pistol-like (PL) DNAzyme as a DNA scaffold for designing a DNAzyme with dual catalytic ... As compared with PL DNAzyme, DRc DNA- zyme function seemed to have decreased sensitivity to the reaction temperature. DRc DNAzyme exhibited a broad functional range for temperatu...

Ngày tải lên: 16/02/2014, 15:20

... cisplatin DNA treatment correlated with the occurrence of sequence motifs forming stable bifunc- tional adducts with the drug (namely, GG and AG doublets) within the target sites. Binding of ... protein with cer- tain response elements can be controlled by changes in DNA topology inducing formation of non-B DNA structures within the binding sites [11,12]. Interactions of p53 with DNA...

Ngày tải lên: 19/02/2014, 05:20