Description Usage Arguments Details Value Author(s) References See Also Examples
couple
is used to link class-probability estimates produced by
pairwise coupling in multi-class classification problems.
1 | couple(probin, coupler = "minpair")
|
probin |
The pairwise coupled class-probability estimates |
coupler |
The type of coupler to use. Currently |
As binary classification problems are much easier to solve many techniques exist to decompose multi-class classification problems into many binary classification problems (voting, error codes, etc.). Pairwise coupling (one against one) constructs a rule for discriminating between every pair of classes and then selecting the class with the most winning two-class decisions. By using Platt's probabilities output for SVM one can get a class probability for each of the k(k-1)/2 models created in the pairwise classification. The couple method implements various techniques to combine these probabilities.
A matrix with the resulting probability estimates.
Alexandros Karatzoglou
alexandros.karatzoglou@ci.tuwien.ac.at
Ting-Fan Wu, Chih-Jen Lin, ruby C. Weng
Probability Estimates for Multi-class Classification by Pairwise
Coupling
Neural Information Processing Symposium 2003
http://books.nips.cc/papers/files/nips16/NIPS2003_0538.pdf
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