cost function in classification learner app

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Artem Bykanov
Artem Bykanov 2018-5-7
编辑： Stephan 2018-5-9
How is it possible to use a costfunction/ penalty function for a Support Vector Machine in the classification Learner App?
If it is not possible, is there a way to train a SVM manually for more than 2 classes?

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Stephan
Stephan 2018-5-8
Hi,
a cost function is not available as far as i know. For more than two classes you could use the function
fitcecoc
see documentation here:
https://de.mathworks.com/help/stats/fitcecoc.html?searchHighlight=fitcecoc&s_tid=doc_srchtitle
Best regards
Stephan
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Artem Bykanov
Artem Bykanov 2018-5-9
Thanks for your answer!
Now I have another problem: In the classificationLearner App I can export a trained Model. (It is a 1x1 struct)
How can generate the same trained model? Because if I try to classify with fitcecoc and validate with crossval I dont get this 1x1 struct.
Best regards
Stephan
Stephan 2018-5-9
编辑：Stephan 2018-5-9
Hi,
when you choose the option "generate code" from the button export model in the classification learner app you get a good commented script with matlab-code doing exactly what you choosed in classification learner app. Then you can modify for your purposes as you want. If you do SVM model with more than 2 classes, i guess the function classification learner will use
fitcecoc
See here for further information:
https://de.mathworks.com/help/stats/export-classification-model-for-use-with-new-data.html
Best regards
Stephan

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