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http://hdl.handle.net/1842/979
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| Title: | Variable word rate N-grams |
| Authors: | Gotoh, Yoshihiko
Renals, Steve |
| Issue Date: | Jun-2000 |
| Citation: | Acoustics, Speech, and Signal Processing, 2000. ICASSP '00. Proceedings. 2000 IEEE International Conference on, Volume 3, 5-9 June 2000 Page(s):1591 - 1594 |
| Publisher: | IEEE |
| Abstract: | The rate of occurrence of words is not uniform but varies from document to document. Despite this observation, parameters for conventional N-gram language models are usually derived using the assumption of a constant word rate. In this paper we investigate the use of variable word rate assumption, modelled by a Poisson distribution or a continuous mixture of Poissons. We present an approach to estimating the relative frequencies of words or N-grams taking prior information of their occurrences into account. Discounting and smoothing schemes are also considered. Using the Broadcast News task, the approach demonstrates a reduction of perplexity up to 10% |
| URI: | http://ieeexplore.ieee.org/
http://hdl.handle.net/1842/979 |
| Appears in Collections: | CSTR publications
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