CONF Tong_INTERSPEECH_2019/IDIAP Unbiased semi-supervised LF-MMI training using dropout Tong, Sibo Vyas, Apoorv Garner, Philip N. Bourlard, Hervé EXTERNAL http://publications.idiap.ch/attachments/papers/2021/Tong_INTERSPEECH_2019.pdf PUBLIC Proceedings of Interspeech 2019 2019 http://dx.doi.org/10.21437/Interspeech.2019-2678 doi