CUED Publications database

Multilingual representations for low resource speech recognition and keyword search

Cui, J and Kingsbury, B and Ramabhadran, B and Sethy, A and Audhkhasi, K and Cui, X and Kislal, E and Mangu, L and Nussbaum-Thom, M and Picheny, M and Tüske, Z and Golik, P and Schluter, R and Ney, H and Gales, MJF and Knill, KM and Ragni, A and Wang, H and Woodland, P (2016) Multilingual representations for low resource speech recognition and keyword search. In: UNSPECIFIED pp. 259-266..

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© 2015 IEEE. This paper examines the impact of multilingual (ML) acoustic representations on Automatic Speech Recognition (ASR) and keyword search (KWS) for low resource languages in the context of the OpenKWS15 evaluation of the IARPA Babel program. The task is to develop Swahili ASR and KWS systems within two weeks using as little as 3 hours of transcribed data. Multilingual acoustic representations proved to be crucial for building these systems under strict time constraints. The paper discusses several key insights on how these representations are derived and used. First, we present a data sampling strategy that can speed up the training of multilingual representations without appreciable loss in ASR performance. Second, we show that fusion of diverse multilingual representations developed at different LORELEI sites yields substantial ASR and KWS gains. Speaker adaptation and data augmentation of these representations improves both ASR and KWS performance (up to 8.7% relative). Third, incorporating un-transcribed data through semi-supervised learning, improves WER and KWS performance. Finally, we show that these multilingual representations significantly improve ASR and KWS performance (relative 9% for WER and 5% for MTWV) even when forty hours of transcribed audio in the target language is available. Multilingual representations significantly contributed to the LORELEI KWS systems winning the OpenKWS15 evaluation.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Divisions: Div F > Machine Intelligence
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:34
Last Modified: 21 Jun 2018 02:36