How to calculate the volume under the ROC surface for multi class classification

I have a problem statement where I need to test the best classifier from around 7 classifiers with 25 classes. In this context, I hope its better to go for the volume under the ROC surface concept. But as per my knowledge MATLAB finds ROC of only binary classifiers. Please help me in solving this issue of mine.
Thanks in advance !!!

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Asked:

on 7 May 2015

Commented:

on 28 Apr 2020

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