public static void Main(string[] args) { // TODO add random seed // TODO report per-user times string data_file = args[0]; string method = args[1]; string options = args[2]; int num_test_users = int.Parse(args[3]); // load the data var all_data = RatingData.Read(data_file); // TODO randomize var test_users = new HashSet <int>(Enumerable.Range(0, num_test_users)); var update_indices = new List <int>(); var eval_indices = new List <int>(); foreach (int user_id in test_users) { if (all_data.ByUser[user_id].Count > 1) { var user_indices = all_data.ByUser[user_id]; for (int i = 0; i < user_indices.Count - 1; i++) { update_indices.Add(user_indices[i]); } for (int i = user_indices.Count - 1; i < user_indices.Count; i++) { eval_indices.Add(user_indices[i]); } } } var training_indices = new List <int>(); for (int i = 0; i < all_data.Count; i++) { if (!test_users.Contains(all_data.Users[i])) { training_indices.Add(i); } } var training_data = new MyMediaLite.Data.Ratings(); foreach (int i in training_indices) { training_data.Add(all_data.Users[i], all_data.Items[i], all_data[i]); } var update_data = new RatingsProxy(all_data, update_indices); var eval_data = new RatingsProxy(all_data, eval_indices); Console.Write(training_data.Statistics()); Console.Write(update_data.Statistics()); Console.Write(eval_data.Statistics()); // prepare recommender RatingPredictor recommender = method.CreateRatingPredictor(); recommender.Configure(options); recommender.Ratings = training_data; Console.WriteLine(string.Format(CultureInfo.InvariantCulture, "ratings range: [{0}, {1}]", recommender.MinRating, recommender.MaxRating)); Console.WriteLine("recommender: {0}", recommender); recommender.Train(); // I. complete retraining Console.WriteLine( "complete training: {0}", recommender.EvaluateFoldInCompleteRetraining(update_data, eval_data)); // II. online updates Console.WriteLine( "incremental training: {0}", ((IncrementalRatingPredictor)recommender).EvaluateFoldInIncrementalTraining(update_data, eval_data)); // III. fold-in Console.WriteLine( "fold-in: {0}", ((IFoldInRatingPredictor)recommender).EvaluateFoldIn(update_data, eval_data)); }