Some mistakes in the algorithm for solving underflow problem in Baum-Welch algorithm and their corrections

(整期优先)网络出版时间:2003-02-12
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Baum-Welchalgorithmmostlikelyresultsinunderflowinpractice.Insomeliteratures,suchas"Scaling"algorithmwasintroducedtosolvetheproblem.Inapplications,however,somemistakeswerefoundintheequationspresentedintheseliteratures.Thepracticalcalculationsshowthattheoriginalalgorithmoftenresultsinpoororevennoneconvergenceandratherhighererrorrateinspeechrecognition.Themistakesintheseliteraturesandbringsforwardthecorrectequationsareanalysed.Thespeechrecognitionsystemusingtherevisedalgorithmcanconvergewellandhaslowererrorrate.