SEMAFOR

Demo

• ARK Syntactic & Semantic Parsing Demo
• Source code for the demo, including the browser visualization of SEMAFOR output

Source Code

• Current development version: SEMAFOR 3.0 alpha
• Archival release: SEMAFOR 2.1

There is now a SEMAFOR users' discussion list which should serve as a forum for questions. SEMAFOR's developers will monitor the list but cannot guarantee technical support.

You can also join the ARK-tools mailing list for announcements about software and datasets from the Noah's ARK lab.

Further Reading

For an up-to-date description of the techniques used in SEMAFOR, see:

• Frame-Semantic Parsing
  Dipanjan Das, Desai Chen, André F. T. Martins, Nathan Schneider, and Noah A. Smith
  In Computational Linguistics 40(1), March 2014.
  (Erratum)
  This paper describes the algorithms used in SEMAFOR as of version 2.1.
• Frame-Semantic Role Labeling with Heterogeneous Annotations
  Meghana Kshirsagar, Sam Thomson, Nathan Schneider, Jaime Carbonell, Noah A. Smith, and Chris Dyer
  In Proceedings of the 53rd Annual Meeting of the Association for Computational Linguistics and the 7th International Joint Conference on Natural Language Processing (ACL-IJCNLP), Beijing, China, July 2015.
  This paper describes enhancements to SEMAFOR that are reflected in version 3.1.

Earlier descriptions appear in:

• An Exact Dual Decomposition Algorithm for Shallow Semantic Parsing with Constraints
  Dipanjan Das, André F. T. Martins, and Noah A. Smith
  In Proceedings of the Joint Conference on Lexical and Computational Semantics (*SEM 2012), Montréal, Québec, June 2012.
• Graph-Based Lexicon Expansion with Sparsity-Inducing Penalties
  Dipanjan Das and Noah A. Smith
  In Proceedings of the Conference of the North American Chapter of the Association for Computational Linguistics (NAACL 2012), Montréal, Québec, June 2012.
• Semi-Supervised Frame-Semantic Parsing for Unknown Predicates
  Dipanjan Das and Noah A. Smith
  In Proceedings of Annual Meeting of the Association for Computational Linguistics (ACL 2011), Portland, OR, June 2011.
• Probabilistic Frame-Semantic Parsing
  Dipanjan Das, Nathan Schneider, Desai Chen, and Noah A. Smith
  In Proceedings of the North American Chapter of the Association for Computational Linguistics Human Language Technologies Conference (NAACL 2010), Los Angeles, CA, June 2010.

The following technical reports supply additional details:

• Semi-Supervised and Latent-Variable Models of Natural Language Semantics
  Dipanjan Das
  Ph.D. Thesis/Carnegie Mellon University Technical Report CMU-LTI-12-007, May 2012.
• SEMAFOR 1.0: A Probabilistic Frame-Semantic Parser
  Dipanjan Das, Nathan Schneider, Desai Chen, and Noah A. Smith
  Carnegie Mellon University Technical Report CMU-LTI-10-001, April 2010.

Acknowledgments

This work was supported by DARPA grant NBCH-1080004, DARPA grant FA8750-12-2-0342 funded under the DEFT program, NSF grants IIS-0836431, IIS-0844507, IIS-0915187, and IIS-1054319, Google's support through the "Wordly Knowledge Project", Qatar National Research Fund grant NPRP08-485-1-083, computational resources provided by Yahoo and TeraGrid resources provided by the Pittsburgh Supercomputing Center under NSF grant number TG-DBS110003.

Please address questions, bug fixes, and comments to the SEMAFOR users' group or code repository.