Adaptation Of Deep Neural Networks
AUTOMATIC SPEECH RECOGNITION: A DEEP LEARNING APPROACH(2015)
摘要
Adaptation techniques can compensate for the difference between the training and testing conditions and thus can further improve the speech recognition accuracy. Unlike Gaussian mixture models (GMMs), which are generative models, deep neural networks (DNNs) are discriminative models. For this reason, the adaptation techniques developed for GMMs cannot be directly applied to DNNs. In this chapter, we first introduce the concept of adaptation. We then describe the important adaptation techniques developed for DNNs, which are classified into the categories of linear transformation, conservative training, and subspace methods. We further show that adaptation in DNNs can bring significant error rate reduction at least for some speech recognition tasks and thus is as important as that in the GMM systems.
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