Publications
CONFERENCE (INTERNATIONAL) Non-Autoregressive ASR with Self-Conditioned Folded Encoders
Tatsuya Komatsu
2022 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2022)
May 22, 2022
This paper proposes CTC-based non-autoregressive ASR with self-conditioned folded encoders. The proposed method realizes non-autoregressive ASR with fewer parameters by folding the conventional stack of encoders into only two blocks; base encoders and folded encoders. The base en-coders convert the input audio features into a neural representation suitable for recognition. This is followed by the folded encoders applied repeatedly for further refinement. Applying the CTC loss to the outputs of all encoders enforces the consistency of the input-output relationship. Thus, folded encoders learn to perform the same operations as an encoder with deeper distinct layers. In experiments, we investigate how to set the number of layers and the number of iterations for the base and folded encoders. The results show that the proposed method achieves a performance comparable to that of the conventional method using only 38% as many parameters. Furthermore, it outperforms the conventional method when increasing the number of iterations.
Paper :
Non-Autoregressive ASR with Self-Conditioned Folded Encoders
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