Báo cáo khoa học: "A Framework of Feature Selection Methods for Text Categorization" potx

... Proceedings of the 47th Annual Meeting of the ACL and the 4th IJCNLP of the AFNLP, pages 692–700, Suntec, Singapore, 2-7 August 2009. c 2009 ACL and AFNLP A Framework of Feature Selection Methods for Text ... become one of the key tools for automatically handling and organizing text information. The problems of text classification normally involve the diffic...

Ngày tải lên: 30/03/2014, 23:20

... fre- quency of a term in the document space (x) and the average frequency of the same set of terms in the sentence space (y). For example, the average number of sentences for the set of terms ... increased avail- ability of full -text articles motivates us to under- stand the nature of language within the body of a document. For example, one study found that full -...

Ngày tải lên: 17/03/2014, 04:20

... A Suite of Shallow Processing Tools for Portuguese: LX-Suite Ant ´ onio Branco Department of Informatics University of Lisbon ahb@di.fc.ul.pt Jo ˜ ao Ricardo Silva Department of Informatics University ... rule could define, for example, 1 http://tagshare.di.fc.ul.pt 2 NLX—Natural Language and Speech Group, at the De- partment of Informatics of the University of Lisbon, Facult...

Ngày tải lên: 17/03/2014, 22:20

... estimating part of speech of unknown words in Asian languages. The cues used for estimating the part of speech of unknown words for Japanese in this paper are ba- sically the same for English, ... which is a set of word models trained for each part of speech (POS + Poisson + bigram). The second model is Equa- tion (13), which is a set of word models trained for...

Ngày tải lên: 23/03/2014, 19:20

... a common form. In addition, any of a number of feature selection metrics may be applied to further reduce the space, for example chi-square, or infor- mation gain (see for example Forman (2003) for ... motiva- tion for the title experiments was to compare their performance to that of the keywords. For all of these three feature inputs, we first evaluated which one of...

Ngày tải lên: 08/03/2014, 02:21

... Thematic segmentation of texts: two methods for two kinds of texts Olivier FERRET LIMSI-CNRS B~t. 508 - BP 133 F-91403, Orsay Cedex, ... according to text characteristics. 3. Pre-processing of the texts As we are interested in the thematic dimension of the texts, they have to be represented by their significant features from ... from that point of view. So, we only hol...

Ngày tải lên: 08/03/2014, 05:21

... Presenting information through text and hyper- text has become a major area of research and development. Complex systems must often deal with a rapidly growing amount of information. In this context, ... (producing the text string) and for- matting (determining the formatting marks to insert in the text string). Developing an appli- cation to present the information for...

Ngày tải lên: 08/03/2014, 05:21

... language for feature structures. In the present work, a framework in three-valued logic is suggested for defining the semantics of a feature structure description language, allowing for a more ... tion in a three-valued framework, for defining the seman- tics of feature structure descriptions including negation 3. This solution is a formalization of the notion of...

Ngày tải lên: 24/03/2014, 02:20

... adipocyte formation, without affecting myogenic differentiation. We also found that expression of miR-27 resulted in blockade of expression of PPARc and C ⁄ EBPa, the two master regulators of adipogenesis. ... 6 of differentiation (A). The amount of Oil Red O was quantified after extraction with isopropanol. The data shown in (B) are mean value ± standard errors of the mean of...

Ngày tải lên: 18/02/2014, 08:20

... the framework of one language. In con- sidering the translation of a certain German verb form into English, it is necessary to un- derstand the German verb form as part of a complex of features ... basis of the occurrences of certain text words that are diagnostic of the field. † This work was supported in part by the U. S. Army (Signal Corps), the U.S. Air Force...

Ngày tải lên: 19/02/2014, 19:20