public void Load(string sFileName, double dTrainSetSize)
{
RankingDB db = Load(sFileName);
_test = new RankingDB();
_train = new RankingDB();
DivideDB(db, dTrainSetSize, _train, _test);
_trainEngine = new RecommenderSystemEngine(_train);
}
private double ComputeRMSE(PredictionMethod m, RecommenderSystemEngine engineTrain, IEnumerable <RankingDB.RankData> allTest)
{
double sum = 0;
foreach (var rankData in allTest)
{
double pretictedRating = Math.Round(engineTrain.PredictRating(m, rankData.ranker, rankData.item));
sum += Math.Pow((rankData.rank - pretictedRating), 2);
}
return(Math.Sqrt(sum / allTest.Count()));
}