In the function gbm() there is a parameter cv.folds. I know this is performing cross-validation but what I don't understand is how to interpret it. I tried extracting it using $cv.error but was greeted with a list of values that seemed to only range from 0.75 to ~0.98.
So what exactly is this parameter doing? If I run this function to boost a classifier, is cv.folds returning cross validation error on each classifier?