Abstract
This paper presents the application of morpheme-based and factored language models in an Amharic speech recognition task. Since the use of morphemes in both acoustic and language models often results in performance degradation due to a higher acoustic confusability and since it is problematic to use factored language models in standard word decoders, we applied the models in a lattice rescoring framework. Lattices of 100 best alternatives for each test sentence of the 5k development test set have been generated using a baseline speech recognizer with a word-based backoff bigram language model. The lattices have then been rescored by means of various morpheme-based and factored language models. A slight improvement in word recognition accuracy has been observed with morpheme-based language models while factored language models led to notable improvements in word recognition accuracy.
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Tachbelie, M.Y., Abate, S.T., Menzel, W. (2011). Morpheme-Based and Factored Language Modeling for Amharic Speech Recognition. In: Vetulani, Z. (eds) Human Language Technology. Challenges for Computer Science and Linguistics. LTC 2009. Lecture Notes in Computer Science(), vol 6562. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-20095-3_8
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DOI: https://doi.org/10.1007/978-3-642-20095-3_8
Publisher Name: Springer, Berlin, Heidelberg
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