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Discriminative training of language models

Fytopoulos Nikolaos

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URIhttp://purl.tuc.gr/dl/dias/9E3E6133-EC63-4B6A-B43A-BCDAB53B3774-
Identifierhttps://doi.org/10.26233/heallink.tuc.23008-
Languageen-
Extent54 pagesen
TitleDiscriminative training of language modelsen
CreatorFytopoulos Nikolaosen
CreatorΦυτοπουλος Νικολαοςel
Contributor [Thesis Supervisor]Digalakis Vasilisen
Contributor [Thesis Supervisor]Διγαλακης Βασιληςel
Contributor [Committee Member]Lagoudakis Michaelen
Contributor [Committee Member]Λαγουδακης Μιχαηλel
Contributor [Committee Member]Diakoloukas Vasilisen
Contributor [Committee Member]Διακολουκας Βασιλeioςel
PublisherTechnical University of Creteen
PublisherΠολυτεχνείο Κρήτηςel
Academic UnitΠολυτεχνείο Κρήτης::Σχολή Ηλεκτρονικών Μηχανικών και Μηχανικών Υπολογιστώνel
Content SummaryThe present thesis investigates the use of discriminative training on continuous Language Models. The main motivation for dealing with continuous language models was that by construction they overcome the limits of N-gram based models. N-gram models have been widely used in Language Modeling, but suffer from lack of generalizability and contain a very large number of parameters that are hard to adapt. Another flaw of N-gram models is the need for a large amount of training data, in order to cover as many N-grams as possible. Continuous Gaussian Mixture Language Models (GMLMs) for Speech Recognition have proven to be effective in terms of smoothing unseen events and adapting efficiently while using relatively small amount of data when compared to N-gram models. The training and testing data were extracted from the Wall Street Journal Corpus. Although the size of the vocabulary used in the corpus is large, the actual number of words being used in the present thesis is resticted. Data has the form of a continuous-space vector and consists of the history of each word in the corpus. The dimensions of these vectors were reduced by using SVD and LDA techniques. As far as the main objective of the thesis is concerned, attempts focus on improving the performance of GMLMs that have been previously trained by using the ML criterion on Language Models by adapting and using the Maximum Mutual Information(MMI) Estimation Method previously deployed in training HMMs for acoustic models. MMI acoustic models have proven to perform better than ML models, therefore MMI training gave a strong incentive in order to apply it on continuous language models. In addition, other discriminative criteria such as Minimum Phone Error (MPE) or Minimum Classification Error(MCE) are also theoretically investigated. Perplexity is the metric being used to measure the effectiveness of the presented method. The experiments of the thesis focus on testing MMI models that are smoothed with their correspondent baseline ML model and MMI models that are unsmoothed, with mixed results. The desired improvement is achieved in the case of unsmoothed MMI models against ML models.en
Type of ItemΔιπλωματική Εργασίαel
Type of ItemDiploma Worken
Licensehttp://creativecommons.org/licenses/by-nc/4.0/en
Date of Item2014-10-22-
Date of Publication2014-
SubjectLanguage modelingen
SubjectPattern classification systemsen
SubjectPattern recognition computersen
Subjectpattern recognition systemsen
Subjectpattern classification systemsen
Subjectpattern recognition computersen
Bibliographic CitationΝικόλαος Φυτόπουλος, "Discriminative training of language models", Διπλωματική Εργασία, Σχολή Ηλεκτρονικών Μηχανικών και Μηχανικών Υπολογιστών, Πολυτεχνείο Κρήτης, Χανιά, Ελλάς, 2014el
Bibliographic CitationNikolaos Fytopoulos, "Discriminative training of language models", Diploma Work, Σχολή Ηλεκτρονικών Μηχανικών και Μηχανικών Υπολογιστών, Πολυτεχνείο Κρήτης, Chania, Greece, 2014en

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