I am trying to do a crossvalidation using a K-nn classifier. In the past, I used cvpartition to achieve this, but I found kfoldLoss function recently and using it seems much easier.
So this is the code that I have where I am using fitcknn to classify breast data (from NIPS) and then want to do 10 fold CV. My question is that when I do kfoldLoss, is it running 10-fold CV where it re-trains and tests on CV partitioned data for each fold, or is using the trained fitcknn 'Mdl' and just using that same trained classifier again and again. And if it does knn again for each partition, do i need to use fitcknn for the complete data because that just seems of no use.
Mdl = fitcknn(breast.sel, breast.labels,'NumNeighbors', 3,'KFold',10);
kl = kfoldLoss(Mdl)