Type Tool
Title IMSCoref
Author Anders Björkelund


The coreference system that Anders Björkelund and Richárd Farkas built for the CoNLL 2012 Shared Task can be downloaded below. The system obtained the second highest overall rank in the Shared Task. For further information about the shared task, check the Shared Task website and the Shared Task overview paper. The system is described in [1]. The downloadable archive contains examples of how to train and test and reproduce our numbers from the shared task.

Note: If you are just looking for an off-the-shelf coreference system, you should check out HOTCoref instead. It is faster and more efficient than IMSCoref.

In the COLING 2012 paper Phrase-structures and Dependencies for End-to-End Coreference Resolution by Anders Björkelund and Jonas Kuhn [2] a modified version of the same system was used to do experiments with dependency syntax. For the purpose of reproducibility the version of that system is available as it's own package below. It's essentially the same system, but with some modifications to handle dependencies. There's a brief summary on how to reproduce the results in download package.

Both versions of the system is licensed under the GNU General Public License. For questions contact Anders Björkelund (


[1] Anders Björkelund and Richárd Farkas. Data-driven Multilingual Coreference Resolution using Resolver Stacking. In Proceedings of the Joint Conference on EMNLP and CoNLL: Shared Task, Jeju Island, Korea, July 12--14, 2012. [pdf] [poster] [bibtex]

[2] Anders Björkelund and Jonas Kuhn. Phrase-structures and Dependencies for End-to-End Coreference Resolution. In Proceedings of COLING 2012: Posters, Mumbai, India, December 8--15, 2012. [pdf] [poster] [bibtex]


  • Download the CoNLL 2012 system here.
  • Download the COLING 2012 system here.