Can we use classification learner App in Matlab for Multi class problem?

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Machine Learning Enthusiast
编辑： Giansu 2021-1-22
It is obvious that we can use it for binary classification having 2 classes.What if we have 3 classes?.I have seen functions like SVMtrain,FITCSVM,SVMCLASSIFY in Matlab. But,i was wondering what if we can directly use classification learner App to train and test my 3 class problem.

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Baptiste Ottino
Baptiste Ottino 2017-8-8
编辑：Baptiste Ottino 2017-8-11
Yes, you can. I know because I played with Fisher's iris data set a little bit, and I can tell you that the App is capable of solving multi-class problems.
EDIT
Sorry, my answer was a bit short. For Fisher's iris data set:
load fisheriris
fisherTable = table(meas, species)
For solving multi-class problems in the App, the best way is to use a table, with all your predictors as the first p columns, and the labels as the last (in that case, the labels are strings).
Open the App, select 'New session', 'From the workspace'. Select fisherTable in Section 1, and Section 2 should look like this:
So the meas are predictors, and the species are the response. Choose your validation method in Section 3 and you should be good to go! This should work for any 3-class data set.
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Giansu
Giansu 2021-1-22
编辑：Giansu 2021-1-22
Hi,
I wonder to know how the multi-class classification internally works in the "classification learner" app.
Are binary classifiers in one-versus-one or one-versus-all configuration? Or are they arranged with a different approach?
I do not find this information in the documentation.
Thank you.

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