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Adapted Extended Baum-Welch transformations

Kanevsky, Dr Dimitri and Povey , Dr Daniel and Ramabhadran, Dr Bhuvana and Sainath, Dr Tara (2007) Adapted Extended Baum-Welch transformations. [Preprint]

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Abstract

The discrimination technique for estimating parameters of Gaussian mixtures that is based on the Extended Baum-Welch transformations (EBW) has had significant impact on the speech recognition community. In this paper we introduce a general definition of a family of EBW transformations that can be associated with a weighted sum of updated and initial models. We compute a gradient steepness measurement for a family of EBW transformations that are applied to functions of Gaussian mixtures and demonstrate the growth property of these transformations. We consider EBW transformations of discriminative functions in which EBW controlled parameters are adapted to a gradient steepness measurement or to the likelihood of the data given the model. We present experimental results that show that adapted EBW transformations can significantly speed up estimating parameters of Gaussian mixtures and give better decoding results.

Item Type:Preprint
Keywords:MMIE training, EBW transformations, gradient steepness
Subjects:Computer Science > Speech
ID Code:5902
Deposited By:Kanevsky, Dr Dimitri
Deposited On:15 Jan 2008 23:56
Last Modified:11 Mar 2011 08:57

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