Method and apparatus for an improved language recognition...

G - Physics – 10 – L

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G10L 15/18 (2006.01) G10L 15/00 (2006.01)

Patent

CA 2198306

Methods and apparatus for a language model and language recognition systems are disclosed. The method utilizes a plurality of probabilistic finite state machines having the ability to recognize a pair of sequences, one sequence scanned leftwards, the other scanned rightwards. Each word in the lexicon of the language model is associated with one or more such machines which model the semantic relations between the word and other words. Machine transitions create phrases from a set of word string hypotheses, and incrementally calculate costs related to the probability that such phrases represent the language to be recognized. The cascading lexical head machines utilized in the methods and apparatus capture the structural associations implicit in the hierachical organization of a sentence, resulting in a language model and language recognition systems that combine the lexical sensitivity of N-gram models with the structural properties of dependency grammar.

L'invention est constituée par une méthode et un appareil pour systèmes de reconnaissance de modèles de langue et de langues. La méthode utilise une pluralité de machines à états finis qui peuvent reconnaître une paire de séquences, l'une balayée vers la gauche et l'autre vers la droite. Chaque mot du lexique du modèle de langue est associé à l'une ou à plusieurs de ces machines qui modélisent les relations sémantiques entre ce mot et d'autres mots. Les transitions des machines produisent des phrases à partir d'un ensemble d'hypothèses à chaînes de mots et calcule de façon incrémentielle les coûts reliés à la probabilité que ces phrases représentent la langue à reconnaître. Les machines de tête lexicales en cascade utilisées dans ces méthodes et cet appareil saisissent les associations structurales implicites dans l'organisation hiérarchique d'une phrase, ce qui donne des systèmes de reconnaissance de modèles de langues et de langues qui combinent la sensibilité lexicale des modèles et les propriétés structurales de la grammaire des dépendances.

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