Manual vs Automatic Bitext Extraction
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Date
2018-05-12
Authors
Myrzakhmetov, Bagdat
Assylbekov, Zhenisbek
Makazhanov, Aibek
Journal Title
Journal ISSN
Volume Title
Publisher
Nazarbayev University School of Sciences and Humanities
Abstract
We compare manual and automatic approaches to the problem of extracting bitexts from the Web in the framework of a case study on building a Russian-Kazakh parallel corpus. Our findings suggest that targeted, site-specific crawling results in cleaner bitexts with a higher ratio of parallel sentences. We also find that general crawlers combined with boilerplate removal tools tend to retrieve shorter texts, as some content gets cleaned out with the markup. When it
comes to sentence splitting and alignment we show that investing some effort in data pre- and post-processing as well as fiddling with off-the-shelf solutions pays a noticeable dividend. Overall we observe that, depending on the source, automatic bitext extraction methods may lack severely in coverage (retrieve fewer sentence pairs) and on average are fewer precise (retrieve less parallel sentence pairs). We conclude that if one aims at extracting high-quality bitexts for a small number of language pairs, automatic methods best be avoided, or at least used with caution.
Description
Keywords
bitext extraction, crawling, sentence alignment
Citation
Makazhanov, A., Myrzakhmetov, B., & Assylbekov, Z. (2018). Manual vs Automatic Bitext Extraction. In 11th International Conference on Language Resources and Evaluation Miyazaki, Japan