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Acoustic Modeling Using Greedy EM

Rusheng Hu, Xiaolong Li, and Yunxin Zhao


In this paper, we present a greedy EM (GEM) method for training Gaussian mixture density (GMD) based acoustic models. In the proposed approach, starting from a single Gaussian, GMD is built up by sequentially adding new components. Each new component is globally selected to avoid local optima. The sequential procedure offers more control over the model structure to achieve better coverage of data. GEM also provides a natural way of integrating information criterion for model complexity selection. Experimental results on WSJ task show that the new method performs consistently better than the conventional method in speech recognition word error rate.


Publication typeInproceedings
Published inProceedings of International Conference on Acoustics, Speech and Signal Processing (ICASSP'05)
PublisherInstitute of Electrical and Electronics Engineers, Inc.
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