Combination of Random Indexing based Language Model and N-gram Language Model for Speech Recognition
Identifieur interne : 001061 ( Main/Exploration ); précédent : 001060; suivant : 001062Combination of Random Indexing based Language Model and N-gram Language Model for Speech Recognition
Auteurs : Dominique Fohr [France] ; Odile Mella [France]Source :
English descriptors
Abstract
This paper presents the results and conclusion of a study on the introduction of semantic information through the Random Indexing paradigm in statistical language models used in speech recognition. Random Indexing is an alternative to Latent Semantic Analysis (LSA) that addresses the scalability problem of LSA. After a brief presentation of Random Indexing (RI), this paper describes, different methods to estimate the RI matrix, then how to derive probabilities from the RI matrix and finally how to combine them with n-gram language model probabilities. Then, it analyzes the performance of these different RI methods and their combinations with a 4-gram language model by computing the perplexity of a test corpus of 290,000 words from the French evaluation campaign ETAPE. Among our results, the main conclusions are (1) regardless of the method, function words should not be taken into account in the estimation of RI matrix; (2) The two methods RI_basic and TTRI_w achieved the best perplexity, i.e. a relative gain of 3% compared to the perplexity of the 4-gram language model alone (136.2 vs. 140.4).
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CS 25233 - 54052 Nancy cedex</addrLine><country key="FR"></country></address><ref type="url">http://www.univ-lorraine.fr/</ref></desc></org></tutelle><tutelle name="UMR7503" active="#struct-441569" type="indirect"><org type="institution" xml:id="struct-441569" status="VALID"><idno type="ISNI">0000000122597504</idno><idno type="IdRef">02636817X</idno><orgName>Centre National de la Recherche Scientifique</orgName><orgName type="acronym">CNRS</orgName><date type="start">1939-10-19</date><desc><address><country key="FR"></country></address><ref type="url">http://www.cnrs.fr/</ref></desc></org></tutelle></tutelles></hal:affiliation><country>France</country><placeName><settlement type="city">Nancy</settlement><settlement type="city">Metz</settlement><region type="region" nuts="2">Grand Est</region><region type="old region" nuts="2">Lorraine (région)</region></placeName><orgName type="university">Université de Lorraine</orgName></affiliation></author></analytic></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="mix" xml:lang="en"><term>language modeling</term><term>random indexing</term><term>speech recognition</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">This paper presents the results and conclusion of a study on the introduction of semantic information through the Random Indexing paradigm in statistical language models used in speech recognition. Random Indexing is an alternative to Latent Semantic Analysis (LSA) that addresses the scalability problem of LSA. After a brief presentation of Random Indexing (RI), this paper describes, different methods to estimate the RI matrix, then how to derive probabilities from the RI matrix and finally how to combine them with n-gram language model probabilities. Then, it analyzes the performance of these different RI methods and their combinations with a 4-gram language model by computing the perplexity of a test corpus of 290,000 words from the French evaluation campaign ETAPE. Among our results, the main conclusions are (1) regardless of the method, function words should not be taken into account in the estimation of RI matrix; (2) The two methods RI_basic and TTRI_w achieved the best perplexity, i.e. a relative gain of 3% compared to the perplexity of the 4-gram language model alone (136.2 vs. 140.4).</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Grand Est</li><li>Lorraine (région)</li></region><settlement><li>Metz</li><li>Nancy</li></settlement><orgName><li>Université de Lorraine</li></orgName></list><tree><country name="France"><region name="Grand Est"><name sortKey="Fohr, Dominique" sort="Fohr, Dominique" uniqKey="Fohr D" first="Dominique" last="Fohr">Dominique Fohr</name></region><name sortKey="Mella, Odile" sort="Mella, Odile" uniqKey="Mella O" first="Odile" last="Mella">Odile Mella</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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