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The Second International Chinese Word Segmentation Bakeoff

The Second International Chinese Word Segmentation Bakeoff. Coordinated by Thomas Emerson. Roadmap. Contest Details Corpora, Tracks, and Sites Results Baselines and Measures Discussion Thanks. Corpora. Four Corpora: 2 simplified chars, 2 traditional

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The Second International Chinese Word Segmentation Bakeoff

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  1. The Second International Chinese Word Segmentation Bakeoff Coordinated by Thomas Emerson

  2. Roadmap • Contest Details • Corpora, Tracks, and Sites • Results • Baselines and Measures • Discussion • Thanks

  3. Corpora • Four Corpora: 2 simplified chars, 2 traditional • All provide ground truth and segmentation standard

  4. Tracks and Sites • Two tracks: • Open: Participants may use any data to train • External lexica, POS information, etc • Closed: Sites may ONLY use training data set • 23 Participating sites completed bakeoff • 9 PRC, 4 HK, 4 US, 2 TW, 1 GB, 1 JP, 1 SG • 130 runs submitted

  5. Results • Baseline: L-to-R MaxMatch w/training vocab: 0.83-0.93 • Topline: L-to-R MaxMatch w/test truth vocab: 0.99 • Measures: Recall, Precision, F-measure • Recall on OOV, Recall on in-vocab • Best F-score: Open 0.972, median 0.941 • Best closed: 0.964 (on MSR corpus) • Best OOV recall: Open 0.872; Closed 0.813 • Vs 2003: best F-score: 0.961: now 17 reach

  6. Results AS Closed: NAIST, Stanford AS Open: SG, Yahoo!, Sheffield MSR Closed Stanford, UHK, Yahoo! MSR Open: Harbin, SG, UHK

  7. Thanks & Future • Thanks to participants and providers • Academia Sinica, ICL Beijing, CUHK,MSRA • Future Bakeoffs: • Different training/test registers? • Additional tasks? NER? • Suggestions?

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