public void Split(Dataset dataset, RecSysContext context, ref IQueryable <Rating> trainset, ref IQueryable <Rating> testset, ref IQueryable <Rating> evalset)
{
int trainCount = Convert.ToInt32(context.Ratings.Where(r => r.DatasetId == dataset.Id).Count() * (1 - _testPortion));
trainset = context.Ratings.Where(r => r.DatasetId == dataset.Id).Take(trainCount);
testset = context.Ratings.Where(r => r.DatasetId == dataset.Id).Skip(trainCount);
evalset = Enumerable.Empty <Rating>().AsQueryable();
}
public void ImportData(RecSysContext recSysContext, Dataset datasetRecord)
{
// step 1: importing item ratings (users, items and ratings)
var conf = new CsvConfiguration();
conf.Delimiter = " ";
var epinionReader = new CsvReader <ItemRating>(_datasetPath, conf, new ItemRatingMap());
recSysContext.ImportItemRatings(epinionReader.ReadSamples(), datasetRecord);
// step 2: importing relations
var relations = File.ReadAllLines(_relationsPath).ToCsvDictionary(' ')
.Select(i => new Relation()
{
UserId = i["UserId"], ConnectedId = i["ConnectionId"], ConnectionType = ConnectionType.Trust
});
Console.WriteLine("Importing {0} relations ...", relations.Count());
recSysContext.ImportToTable("Relations", relations);
}
public void ImportData(RecSysContext recSysContext, Dataset datasetRecord)
{
var itemRatings = (new MovieLensReader(_datasetPath)).ReadSamples();
recSysContext.ImportItemRatings(itemRatings, datasetRecord);
}
public RatingDataset(Data.Dataset dataset, RecSysContext context, ISplitter splitter)
{
_allSamples = context.Ratings.Where(r => r.DatasetId == dataset.Id);
splitter.Split(dataset, context, ref _trainSamples, ref _testSamples, ref _evalSamples);
}