namespace Microsoft.ML.Probabilistic.Learners
{
    public class RecommenderEvaluator<TInstanceSource, TUser, TItem, TGroundTruthRating, TPredictedRating, TPredictedRatingDist>
    {
        public double ItemRecommendationMetric(TInstanceSource instanceSource, IDictionary<TUser, IEnumerable<TItem>> predictions, Func<IEnumerable<double>, IEnumerable<double>, double> metric, Func<TGroundTruthRating, double> ratingConverter = null);
    }
}