public static void GenerateSplitTestAndTrainDataFiles()
{
//split
Console.WriteLine("Loading all users... {0}", DateTime.Now.ToLongTimeString());
var users = UserProvider.Load(DataFiles.Users);
List <IUser> trainUsers,
testUsers;
Console.WriteLine("Spliting users into train and test sets... {0}", DateTime.Now.ToLongTimeString());
users.SplitIntoTrainAndTest(out trainUsers, out testUsers);
trainUsers.Sort();
testUsers.Sort();
Console.WriteLine("Saving train users... {0}", DateTime.Now.ToLongTimeString());
UserProvider.Save(DataFiles.TrainUsers, trainUsers);
Console.WriteLine("Saving test users... {0}", DateTime.Now.ToLongTimeString());
UserProvider.Save(DataFiles.TestUsers, testUsers);
var trainUserCount = trainUsers.Count;
var testUserCount = testUsers.Count;
Console.WriteLine("Loading artists... {0}", DateTime.Now.ToLongTimeString());
var artistLut = ArtistProvider.Load(DataFiles.Artists).GetLookupTable();
//train dataset
Console.WriteLine("Saving and reloading train ratings... {0}", DateTime.Now.ToLongTimeString());
LoadAndSaveRatings(DataFiles.TrainPlaycounts, trainUsers, artistLut);
GC.Collect();
Console.WriteLine("Preprocessing train ratings... {0}", DateTime.Now.ToLongTimeString());
PreprocessTrainRatings(trainUserCount);
//test dataset
Console.WriteLine("Saving and reloading test ratings... {0}", DateTime.Now.ToLongTimeString());
LoadAndSaveRatings(DataFiles.TestPlaycounts, testUsers, artistLut);
GC.Collect();
Console.WriteLine("Preprocessing test ratings... {0}", DateTime.Now.ToLongTimeString());
PreprocessTestRatings(testUserCount);
GC.Collect();
}
private static int LoadFromDataset()
{
Console.WriteLine("Loading users from dataset... {0}", DateTime.Now.ToLongTimeString());
List <string> userLut,
artistLut;
var users = UserProvider.ImportFromDataset(DataFiles.UserDataset, out userLut);
UserProvider.Save(DataFiles.Users, users);
GC.Collect();
Console.WriteLine("Loading artists from dataset... {0}", DateTime.Now.ToLongTimeString());
var artists = ArtistProvider.ImportFromDataset(DataFiles.RatingDataset, out artistLut);
ArtistProvider.Save(DataFiles.Artists, artists);
Console.WriteLine("Loading ratings from dataset... {0}", DateTime.Now.ToLongTimeString());
var ratings = RatingProvider.ImportFromDataset(DataFiles.RatingDataset, userLut, artistLut);
Console.WriteLine("Populating users with ratings... {0}", DateTime.Now.ToLongTimeString());
users.PopulateWithRatings(ratings, true);
GC.Collect();
Console.WriteLine("Extracting ratings from users... {0}", DateTime.Now.ToLongTimeString());
ratings.ExtractFromUsers(users, false);
RatingProvider.Save(DataFiles.Playcounts, ratings);
return(users.Count);
}