Brian Hutchinson, Li Deng, and Dong Yu
We develop and describe a novel deep architecture, the Tensor Deep Stacking Network (T-DSN), where multiple blocks are stacked one on top of another and where a bilinear mapping from hidden repre- sentations to the output in each block is used to incorporate higher- order statistics of the input features. A learning algorithm for the T-DSN is presented, in which the main parameter estimation bur- den is shifted to a convex sub-problem with a closed-form solution. Using an ef?cient and scalable parallel implementation, we train a T-DSN to discriminate standard three-state monophones in the TIMIT database. The T-DSN outperforms an alternative pretrained Deep Neural Network (DNN) architecture in frame-level classi?ca- tion (both state and phone) and in the cross-entropy measure. For continuous phonetic recognition, T-DSN performs equivalently to a DNN but without the need for a hard-to-scale, sequential ?ne-tuning step.
|Published in||ICASSP 2012|