Publication details

Building a 70 billion word corpus of English from ClueWeb

Authors

POMIKÁLEK Jan RYCHLÝ Pavel JAKUBÍČEK Miloš

Year of publication 2012
Type Article in Proceedings
Conference Proceedings of the Eight International Conference on Language Resources and Evaluation (LREC'12)
MU Faculty or unit

Faculty of Informatics

Citation
Web http://nlp.fi.muni.cz/publications/lrec2012_xpomikal_pary_xjakub/lrec2012.pdf
Field Informatics
Keywords corpus; clueweb; English; encoding; word sketch
Attached files
Description This work describes the process of creation of a 70 billion word text corpus of English. We used an existing language resource, namely the ClueWeb09 dataset, as source for the corpus data. Processing such a vast amount of data presented several challenges, mainly associated with pre-processing (boilerplate cleaning, text de-duplication) and post-processing (indexing for efficient corpus querying using the CQL – Corpus Query Language) steps. In this paper we explain how we tackled them: we describe the tools used for boilerplate cleaning (jusText) and for de-duplication (onion) that was performed not only on full (document-level) duplicates but also on the level of near-duplicate texts. Moreover we show the impact of each of the performed pre-processing steps on the final corpus size. Furthermore we show how effective parallelization of the corpus indexation procedure was employed within the Manatee corpus management system and during computation of word sketches (one-page, automatic, corpus-derived summaries of a word’s grammatical and collocational behaviour) from the resulting corpus.
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