Báo cáo khoa học: "Directional Distributional Similarity for Lexical Expansion" pot

... v’. While distributional similarity is most promi- nently modeled by symmetric measures, lexical expansion is in general a directional relation. In IR, for instance, a user looking for “baby ... research area for a couple of decades (Hindle, 1990; Lin, 1998; Weeds and Weir, 2003). This paper is motivated by one of the prominent applications of distributional similarity, namely...

Ngày tải lên: 23/03/2014, 17:20

... 60.4% 62.6% Table 2. Performance results for different models Table 2 details the performance scores for the experiments, which shows that both of the two distributional similarity- based models ... et al., 1997). An investi- gation on distributional similarity functions can be found in (Lillian Lee, 1999). 3 Distributional Similarity- Based Mod- els for Query Spelling...

Ngày tải lên: 17/03/2014, 04:20

... evaluate the similarity for two vec- tors in the same language, so using cosine dis- tance to compute the similarity is straightfor- ward. And we can set a relatively large size for the vector, ... co-occurrence counts of the two units. Therefore, questions emerge: how good is the sense similarity computed via VSM for two units from parallel corpora? Is it useful for multi-...

Ngày tải lên: 20/02/2014, 04:20

... the best accuracy/efficiency trade-off. 2 Distributional Similarity Measuring distributional similarity first requires the extraction of context information for each of the vocabulary terms from raw ... wealth of data. Curran and Moens (2002) show that synonymy extraction for lexical semantic resources using distributional similarity produces continuing gains in accuracy as th...

Ngày tải lên: 31/03/2014, 01:20

... checked for minimality during a second. Since update-node is a general mechanism for adding or modifying information to a node on the basis of c-commanding constituents it is fairly straightforward ... algorithm explicitly indicates the potential antecedents of a personal pronoun. Again, this is more desirable than leaving this information implicit; besides the potential (and perha...

Ngày tải lên: 21/02/2014, 20:20

... to build in- formation based services around SMS technology. Today, a majority of SMS based information ser- vices require users to type specific codes to re- trieve information. For example to ... recently allowed users to formulate queries in natural language using SMS. For example, many contact centers now allow cus- tomers to “text” their complaints and requests for information over...

Ngày tải lên: 08/03/2014, 00:20

... the problem of the lexical gap by various techniques for question reformulation, including rule-based syntactic and semantic refor- mulation patterns (Hermjakob et al., 2002), refor- mulations based ... gap. For example, syn- tactic information has been deployed to reformu- late questions (Hermjakob et al., 2002) or to re- place questions by syntactically similar ones (Lin and Pantel, 2...

Ngày tải lên: 08/03/2014, 02:21

... application-specific format could be translated directly into the virtual AML, eliminating the need for the intermediary concrete AML format. However, especially for existing formats, it is typically ... by the informed human reader). Hand-developed annotation schemes used in treebanks are often described informally in guidebooks for annotators, leaving considerable room for variation...

Ngày tải lên: 08/03/2014, 05:20

... world changes. For example, Diekema et al., in a presentation at the 1998 TREC-7 conference (Voorhees and Har- man, 1998), observed that the performance of their cross-language information retrieval ... (Dunning, 1994). Although this does introduce a need for language-specific training data for the two languages under consideration, it is a very mild form of language dependence:...

Ngày tải lên: 08/03/2014, 06:20

... descriptive in- formation into the relations holding between re- ferring expressions (REs). This layer of semantic context abstracts from the specific lexical expres- sions used, and therefore represents ... 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...

Ngày tải lên: 08/03/2014, 21:20