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Experiments with a PPM Compression-Based Method for English-Chinese Bilingual Sentence Alignment

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Book cover Statistical Language and Speech Processing (SLSP 2014)

Part of the book series: Lecture Notes in Computer Science ((LNAI,volume 8791))

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Abstract

Alignment of parallel corpora is a crucial step prior to training statistical language models for machine translation. This paper investigates compression-based methods for aligning sentences in an English-Chinese parallel corpus. Four metrics for matching sentences required for measuring the alignment at the sentence level are compared: the standard sentence length ratio (SLR), and three new metrics, absolute sentence length difference (SLD), compression code length ratio (CR), and absolute compression code length difference (CD). Initial experiments with CR show that using the Prediction by Partial Matching (PPM) compression scheme, a method that also performs well at many language modeling tasks, significantly outperforms the other standard compression algorithms Gzip and Bzip2. The paper then shows that for sentence alignment of a parallel corpus with ground truth judgments, the compression code length ratio using PPM always performs better than sentence length ratio and the difference measurements also work better than the ratio measurements.

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Authors and Affiliations

  1. School of Computer Science, Bangor University, Dean Street, Bangor, Gwynedd, LL57 1UT, UK

    Wei Liu, Zhipeng Chang & William J. Teahan

Authors
  1. Wei Liu
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  2. Zhipeng Chang
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  3. William J. Teahan
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Corresponding author

Correspondence to Wei Liu .

Editor information

Editors and Affiliations

  1. University Joseph Fourier, Grenoble, France

    Laurent Besacier

  2. Rovira i Virgili University, Tarragona, Spain

    Adrian-Horia Dediu

  3. Rovira i Virgili University, Tarragona, Spain

    Carlos Martín-Vide

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Liu, W., Chang, Z., Teahan, W.J. (2014). Experiments with a PPM Compression-Based Method for English-Chinese Bilingual Sentence Alignment. In: Besacier, L., Dediu, AH., Martín-Vide, C. (eds) Statistical Language and Speech Processing. SLSP 2014. Lecture Notes in Computer Science(), vol 8791. Springer, Cham. https://doi.org/10.1007/978-3-319-11397-5_5

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  • DOI: https://doi.org/10.1007/978-3-319-11397-5_5

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-11396-8

  • Online ISBN: 978-3-319-11397-5

  • eBook Packages: Computer ScienceComputer Science (R0)

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