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Variable word rate N-grams

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Gotoh ICASSP.pdf (391.0Kb)
Date
06/2000
Author
Gotoh, Yoshihiko
Renals, Steve
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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%
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http://ieeexplore.ieee.org/

http://hdl.handle.net/1842/979
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