automatically harvesting semantic relations

... Association for Computational Linguistics Espresso: Leveraging Generic Patterns for Automatically Harvesting Semantic Relations Patrick Pantel Information Sciences Institute University of Southern ... auto- matically harvesting shallow semantic resources. With seemingly endless amounts of textual data at our disposal, we have a tremendous opportu- nity to automatically grow semantic term banks ... present Espresso, a weakly-supervised, general-purpose, and accurate algorithm for harvesting semantic relations. The main contribu- tions are: i) a method for exploiting ge- neric patterns...

Ngày tải lên: 08/03/2014, 02:21

... syn- sets) for terms in domain-specific verb relations. These relations, such as (x, EXPAND, y) are first automatically learnt from a corpus. The semantic classes of x and y are then inferred ... many algorithms for harvesting semantic relations from corpora and the Web. For the purposes of this paper, we may choose any one of them and manually validate its mined relations. We choose ... complex lexi- cal structures like binary semantic relations, the paper focused only on attaching terms. Basili (2000) proposed an unsupervised method to infer semantic classes (WordNet syn- sets)...

Ngày tải lên: 20/02/2014, 12:20

... representation of semantic relations using recursive lexico-syntactic patterns. • An automatic procedure to learn the se- lectional restrictions (arguments and super- types) of semantic relations from ... ar- guments and the supertypes of a diverse set of semantic relations from the Web. We evaluate the performance of our algo- rithm on multiple semantic relations ex- pressed using “verb”, “noun”, and ... in at- tempts to harvest bits of semantic information, in- cluding: semantic lexicons (Riloff and Shepherd, 1997), concept lists (Lin and Pantel, 2002), is- a relations (Hearst, 1992; Etzioni...

Ngày tải lên: 07/03/2014, 22:20

... sentences with relations (see Section 6.2). Using this method we can identify the matching relation forms of se- mantic relations to decide the semantic relation for NCs. 3 Semantic Relations in ... of semantic relations. Based on the pioneering work on Levi (1979) and Finin (1980), there have been efforts in com- putational linguistics to arrive at largely task- specific sets of semantic relations, ... of semantic relations. First we map verb tokens in sentential con- texts to a fixed set of seed verbs using WordNet::Similarity and Moby’s Thesaurus. We then match the sentences with semantic relations...

Ngày tải lên: 08/03/2014, 02:21

... particular semantic rela- tion like hypernymy or purpose linking the two input words, e.g., "return" is a hypernym of "forehand." • Many heuristics look for particular semantic ... and Retrieval with Semantic Background Knowl- edge" Ph.D thesis, MIT Media Laboratory. 4. Chakravarthy, Anil S. and Haase, Kenneth B. 1995. "NetSerf: Using Semantic Knowledge to ... Text Retrieval," in Pro- ceedings of SIGIR'93. 295 Sense Disambiguation Using Semantic Relations and Adjacency Information Anil S. Chakravarthy MIT Media Laboratory 20 Ames Street...

Ngày tải lên: 08/03/2014, 07:20

... promising direction is to investigate relational models for un- supervised semantic analysis of noun compounds. The range of semantic relations that can be ex- pressed by compounds is the subject of some ... is evidence that the same semantic relation tends to hold between the members of each pair. A re- lational distributional hypothesis therefore states that two word pairs are semantically similar if ... including SAT verbal analogy tests, synonym/antonym classification and distinction between semantically similar and semantically as- sociated words. Our future research plans include investigating the...

Ngày tải lên: 08/03/2014, 21:20

... LKBs, in addition to information on words and semantic relations, it is important that these interfaces provide usage ex- amples where semantic relations hold, or at least where related words ... aware that the proper interpretation of the semantic relations may vary in the different re- sources, even disregarding possible mistakes in the automatic harvesting. It is enough to consider the ... listing words but going deeper into mean- ing, and listing semantic properties like word senses or relationships between senses. So, a list of relations among words can con- flate a number of highly...

Ngày tải lên: 08/03/2014, 21:20

... ex- traction of semantic relations has not been hitherto recognized. We introduce the prob- lem of comma resolution, defined as under- standing the role of commas and extracting the relations they ... outlined above explains the relations generated by a single example. In addition to covering the relations gen- erated by the example, we wish to ensure that it does not cover erroneous relations by matching ... Pantel and M. Pennacchiotti. 2006. Espresso: Lever- aging generic patterns for automatically harvesting se- mantic relations. In Proc. of the Annual Meeting of the ACL, pages 113–120. M. Pasca,...

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Ngày tải lên: 31/03/2014, 01:20

... syntactic features from Section 4. Semantic The semantic features from Section 4. All Both syntactic and semantic features. All+Tmp (Causals Only) Syntactic and semantic features, plus the gold-standard ... of parallel temporal and causal relations and exploring machine learning approaches to extracting these relations. 2 Related Work Much recent work on temporal relations revolved around the TimeBank ... showed that temporal relations between a verb and a complement clause could be identified with accuracies of nearly 90%. Recent work on causal relations has also found that arbitrary relations in text...

Ngày tải lên: 08/03/2014, 01:20

... colleagues pro- vide a set of ‘thematic relations (derived from relations proposed by, for example, Levi, 1978) which, they argue, cover the majority of semantic relations between modifier (first word) ... pairs (sense pairs) and semantic relations, they differ in that Rosario et al.’s algorithm uses a static list of manually-defined rules linking category pairs and semantic relations, while our PRO ... Shoben’s set. These relations were therefore added to the list of relations we used. Various other less commonly- occuring relations were also observed. To allow for these other relations, a function...

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