/// <summary>
/// Get a list of all users and their ratings on every article
/// </summary>
public UserMenuRatingsTable GetUserMenuRatingsTable(IRater rater)
{
UserMenuRatingsTable table = new UserMenuRatingsTable();
table.UserIndexToId = db.Users.OrderBy(x => x.Id).Select(x => x.Id).Distinct().ToList();
table.MenuIndexToId = db.Menus.OrderBy(x => x.Id).Select(x => x.Id).Distinct().ToList();
foreach (int userId in table.UserIndexToId)
{
table.UserMenuRatings.Add(new UserMenuRatings(userId, table.MenuIndexToId.Count));
}
var userArticleRatingGroup = db.UserActions
.GroupBy(x => new { x.UserId, x.MenuId })
.Select(g => new { g.Key.UserId, g.Key.MenuId, Rating = rater.GetRating(g.ToList()) })
.ToList();
foreach (var userAction in userArticleRatingGroup)
{
int userIndex = table.UserIndexToId.IndexOf(userAction.UserId);
int articleIndex = table.MenuIndexToId.IndexOf(userAction.MenuId);
table.UserMenuRatings[userIndex].MenuRatings[articleIndex] = userAction.Rating;
}
return(table);
}
public void Train(UserBehavior db)
{
UserBehaviorTransformer ubt = new UserBehaviorTransformer(db);
ratings = ubt.GetUserMenuRatingsTable(rater);
List <MenuCategoryCounts> menuCategories = ubt.GetMenuCategoryCounts();
ratings.AppendMenuFeatures(menuCategories);
FillTransposedRatings();
}
