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Minimum Phone Error and I-smoothing for improved discriminative training

Povey, D., Woodland, P.C.·2002·IEEE International Conference on Acoustics Speech and Signal Processing

Abstract

In this paper we introduce the Minimum Phone Error (MPE) and Minimum Word Error (MWE) criteria for the discriminative training of HMM systems. The MPE/MWE criteria are smoothed approximations to the phone or word error rate respectively. We also discuss I-smoothing which is a novel technique for smoothing discriminative training criteria using statistics for maximum likelihood estimation (MLE). Experiments have been performed on the Switchboard/Call Home corpora of telephone conversations with up to 265 hours of training data. It is shown that for the maximum mutual information estimation (MMIE) criterion, I-smoothing reduces the word error rate (WER) by 0.4% absolute over the MMIE baseline. The combination of MPE and I-smoothing gives an improvement of 1 % over MMIE and a total reduction in WER of 4.8% absolute over the original MLE system.

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Metadata

Authors
Povey, D., & Woodland, P. C.
Venue
IEEE International Conference on Acoustics Speech and Signal Processing
Publisher
IEEE
Published
2002-05
Pages
I-105-I-108
ISSN
1520-6149 (ISSN-L)
OpenAlex
W2150907703
Cited by
622
References
9
FWCI
8.43
Type
conference paper
Language
en
Open access
closed

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CoChat. (2026). Citation check: Minimum Phone Error and I-smoothing for improved discriminative training. https://app.cochat.ai/papers/10.1109/icassp.2002.5743665
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Povey, D., & Woodland, P. C. (2002). Minimum Phone Error and I-smoothing for improved discriminative training. IEEE International Conference on Acoustics Speech and Signal Processing. https://doi.org/10.1109/icassp.2002.5743665

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

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