/// <summary>Evaluate an iterative recommender on the folds of a dataset split, display results on STDOUT</summary>
/// <param name="recommender">a rating predictor</param>
/// <param name="num_folds">the number of folds</param>
/// <param name="max_iter">the maximum number of iterations</param>
/// <param name="find_iter">the report interval</param>
/// <param name="show_fold_results">if set to true to print per-fold results to STDERR</param>
static public void DoIterativeCrossValidation(
this RatingPredictor recommender,
uint num_folds,
uint max_iter,
uint find_iter = 1,
bool show_fold_results = false)
{
var split = new RatingCrossValidationSplit(recommender.Ratings, num_folds);
recommender.DoIterativeCrossValidation(split, max_iter, find_iter, show_fold_results);
}