In practical classification, there is often a mix of learnable and unlearnable classes and only a classifier above a minimum performance threshold can be deployed.
GNUBrain is a framework for creating personal software agents, building a multi-agent system, manage your personal meta data and execute distributed algorithms.
Y. Yang, and J. Pedersen. Proceedings of ICML-97, 14th International Conference on Machine Learning, page 412--420. Nashville, US, Morgan Kaufmann Publishers, San Francisco, US, (1997)
S. Schwiebert. Sprachtechnologie, mobile Kommunikation und linguistische Ressourcen. Beiträge zur GLDV-Tagung 2005 in Bonn, volume 8 of Sprache, Sprechen und Computer, page 633--646. Frankfurt a.M., Lang, (2005)
J. Hermes, and C. Benden. Sprachtechnologie, mobile Kommunikation und linguistische Ressourcen. Beiträge zur GLDV-Tagung 2005 in Bonn, volume 8 of Sprache, Sprechen und Computer, page 78--90. Frankfurt a.M., Lang, (2005)
R. Grishman, and B. Sundheim. Proceedings of the 16th International Conference on Computational Linguistics (COLING), page 466--471. Kopenhagen, (1996)