Multi-Class training data set from the LIBSVM database
news20
An object of class list of length 2.
Ken Lang. Newsweeder: Learning to filter netnews. In Proceedings of the Twelfth International Conference on Machine Learning, pages 331-339, 1995.
https://www.csie.ntu.edu.tw/~cjlin/libsvmtools/datasets/multiclass.html