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Optimizing the Forward Algorithm for Hidden Markov Model on IBM Roadrunner clustersSOIMAN, S.-I. , RUSU, I. , PENTIUC, S.-G.
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forward algorithm, hidden Markov models, multicore processing, parallel hybrid architectures, parallel programming, performance analysis
parallel(9), models(6), markov(6), hidden(6), cell(6), systems(5), ipdps(5), distributed(5), computing(5), recognition(4)
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About this article
Date of Publication: 2015-05-31
Volume 15, Issue 2, Year 2015, On page(s): 103 - 108
ISSN: 1582-7445, e-ISSN: 1844-7600
Digital Object Identifier: 10.4316/AECE.2015.02013
Web of Science Accession Number: 000356808900013
SCOPUS ID: 84979846307
In this paper we present a parallel solution of the Forward Algorithm for Hidden Markov Models. The Forward algorithm compute a probability of a hidden state from Markov model at a certain time, this process being recursively. The whole process requires large computational resources for those models with a large number of states and long observation sequences. Our solution in order to reduce the computational time is a multilevel parallelization of Forward algorithm. Two types of cores were used in our implementation, for each level of parallelization, cores that are graved on the same chip of PowerXCell8i processor. This hybrid architecture of processors permitted us to obtain a speedup factor over 40 relative to the sequential algorithm for a model with 24 states and 25 millions of observable symbols. Experimental results showed that the parallel Forward algorithm can evaluate the probability of an observation sequence on a hidden Markov model 40 times faster than the classic one does. Based on the performance obtained, we demonstrate the applicability of this parallel implementation of Forward algorithm in complex problems such as large vocabulary speech recognition.
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