Cross Validation explained in one simple picture. The method shown here is k-fold cross validation, where data is split into k folds (in this example, 5 folds). Blue balls represent training data; 1/k (i.e. 1/5) balls are held back for model testing. Monte Carlo cross validation works the same way, except that the balls would be chosen with replacement. In other words, it would be possible for a…
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