NP Chunking (State of the art)

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  • Performance measure: F = 2 * Precision * Recall / (Recall + Precision)
  • Precision: percentage of NPs found by the algorithm that are correct
  • Recall: percentage of NPs defined in the corpus that were found by the chunking program
  • Training data: sections 15-18 of Wall Street Journal corpus (Ramshaw and Marcus)
  • Testing data: section 20 of Wall Street Journal corpus (Ramshaw and Marcus)
  • original data of the NP chunking experiments by Lance Ramshaw and Mitch Marcus
  • data contains one word per line and each line contains six fields of which only the first three fields are relevant: the word, the part-of-speech tag assigned by the Brill tagger, and the correct IOB tag

Table of results

System name Short description Main publications Software Results (F)
KM00 B-I-O tagging using SVM classifiers with polynomial kernel Kudo and Matsumoto (2000) YAMCHA Toolkit (but models are not provided) 93.79%
KM01 learning as in KM00, but voting between different representations Kudo and Matsumoto (NAACL 2001) No 94.22%
SP03 Second order conditional random fields Fei Sha and Fernando Pereira (HLT/NAACL 2003) No 94.3%
SS05 specialized HMM + voting between different representations Shen and Sarkar (2005) No 95.23%
M05 Second order conditional random fields + multi-label classification Ryan McDonald, KOby Crammer and Fernando Pereira (HLT/EMNLP 2005) No 94.29%
S08 Second order latent-dynamic conditional random fields + an improved inference method based on A* search Xu Sun and Louis-Philippe Morency and Daisuke Okanohara and Jun'ichi Tsujii (COLING 2008) No 94.34%


Kudo, T., and Matsumoto, Y. (2000). Use of support vector learning for chunk identification. Proceedings of the 4th Conference on CoNLL-2000 and LLL-2000, pages 142-144, Lisbon, Portugal.

Kudo, T., and Matsumoto, Y. (2001). Chunking with support vector machines. Proceedings of NAACL-2001.

Sha, F., and F. Pereira (2003). Shallow Parsing with Conditional Random Fields. Proceedings of HLT-NAACL 2003, pages 213-220. Edmonton, Canada.

Shen, H., and Sarkar, A. (2005). Voting between multiple data representations for text chunking. Proceedings of the Eighteenth Meeting of the Canadian Society for Computational Intelligence, Canadian AI 2005.

McDonald, R., K. Crammer and F. Pereira (2005). Flexible Text Segmentation with Structured Multilabel Classification]. Human Language Technologies and Empirical Methods in Natural Language Processing (HLT-EMNLP), 2005

Sun, X., L.P. Morency, D. OKanohara and J. Tsujii (2008). Modeling Latent-Dynamic in Shallow Parsing: A Latent Conditional Model with Improved Inference. Proceedings of The 22nd International Conference on Computational Linguistics (COLING 2008). Pages 841-848. Manchester, UK.

See also

External links