does matlab 2015 support svm multiclass??
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Sahar abdalah
il 22 Mag 2015
Commentato: Walter Roberson
il 23 Mag 2015
I use matlab 2013b for programmation but this version does not support svm multiclass. my question there is another version that support svm for multi classification?
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Walter Roberson
il 22 Mag 2015
Modificato: Walter Roberson
il 22 Mag 2015
"ClassificationECOC is an error-correcting output codes (ECOC) classifier for multiclass learning by reduction to multiple, binary classifiers such as support vector machines (SVMs). Train a ClassificationECOC classifier using fitcecoc and the training data."
Real multiclass SVM is really slow and needs a lot of memory, and is considered "feasible" (under a loose sense of the word) for at most 3 classes, and "possible if you are willing to wait several days" for 4 classes, but a matter for supercomputer clusters for 5 or more classes.
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Walter Roberson
il 23 Mag 2015
It looks to me as if it can handle a large number of classes, but the computation is going to involve a decision matrix which is potentially large; see <http://www.mathworks.com/help/stats/classificationecoc-class.html#bue4w15 Coding Design" for how many rows the matrix would have.
I have not investigated how to interpret the various kinds of decision outputs.
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