A statisticallanguage model, or more simply a language model, is a prob­ abilistic mechanism for generating text. Such adefinition is general enough to include an endless variety of schemes. However, a distinction should be made between generative models, which can in principle be used to synthesize...

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Weitere Verfasser:	Croft, W. Bruce (HerausgeberIn), Lafferty, John (HerausgeberIn)
Format:	Elektronisch E-Book
Sprache:	English
Veröffentlicht:	Dordrecht Springer Netherlands 2003
Ausgabe:	1st ed. 2003
Schriftenreihe:	The Information Retrieval Series 13
Schlagworte:	Data Structures and Information Theory Information Storage and Retrieval Computer Science, general Artificial Intelligence Data structures (Computer science) Information storage and retrieval Computer science Artificial intelligence Computerlinguistik Information Retrieval Sprache Konferenzschrift > 2001 > Pittsburgh, Pa.
Online-Zugang:	UBY01 URL des Eerstveröffentlichers
Zusammenfassung:	A statisticallanguage model, or more simply a language model, is a prob­ abilistic mechanism for generating text. Such adefinition is general enough to include an endless variety of schemes. However, a distinction should be made between generative models, which can in principle be used to synthesize artificial text, and discriminative techniques to classify text into predefined cat­ egories. The first statisticallanguage modeler was Claude Shannon. In exploring the application of his newly founded theory of information to human language, Shannon considered language as a statistical source, and measured how weH simple n-gram models predicted or, equivalently, compressed natural text. To do this, he estimated the entropy of English through experiments with human subjects, and also estimated the cross-entropy of the n-gram models on natural 1 text. The ability of language models to be quantitatively evaluated in tbis way is one of their important virtues. Of course, estimating the true entropy of language is an elusive goal, aiming at many moving targets, since language is so varied and evolves so quickly. Yet fifty years after Shannon's study, language models remain, by all measures, far from the Shannon entropy liInit in terms of their predictive power. However, tbis has not kept them from being useful for a variety of text processing tasks, and moreover can be viewed as encouragement that there is still great room for improvement in statisticallanguage modeling
Beschreibung:	1 Online-Ressource (XIV, 246 p)
ISBN:	9789401701716
DOI:	10.1007/978-94-017-0171-6