Randil Pushpananda


2021

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Improve Sinhala Speech Recognition Through e2e LF-MMI Model
Buddhi Gamage | Randil Pushpananda | Thilini Nadungodage | Ruwan Weerasinghe
Proceedings of the 18th International Conference on Natural Language Processing (ICON)

Automatic speech recognition (ASR) has experienced several paradigm shifts over the years from template-based approaches and statistical modeling to the popular GMM-HMM approach and then to deep learning hybrid model DNN-HMM. The latest shift is to end-to-end (e2e) DNN architecture. We present a study to build an e2e ASR system using state-of-the-art deep learning models to verify the applicability of e2e ASR models for the highly inflected and yet low-resource Sinhala language. We experimented on e2e Lattice-Free Maximum Mutual Information (e2e LF-MMI) model with the baseline statistical models with 40 hours of training data to evaluate. We used the same corpus for creating language models and lexicon in our previous study, which resulted in the best accuracy for the Sinhala language. We were able to achieve a Word-error-rate (WER) of 28.55% for Sinhala, only slightly worse than the existing best hybrid model. Our model, however, is more context-independent and faster for Sinhala speech recognition and so more suitable for general purpose speech-to-text translation.

2014

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Sinhala-Tamil Machine Translation: Towards better Translation Quality
Randil Pushpananda | Ruvan Weerasinghe | Mahesan Niranjan
Proceedings of the Australasian Language Technology Association Workshop 2014