public Dictionary <User, double> GetRecommendations(User user)
{
using (RecommenderContext db = new RecommenderContext())
{
Dictionary <User, double> similarUsers = new Dictionary <User, double>();
var users = db.Users.Where(s => s.Scrobbles.Count != 0).ToList();
var artstsCount = db.Scrobbles.Where(u => u.UserId == user.ID).Select(sc => sc.Track.Artist).Count();
var topArtists = db.Scrobbles.Where(u => u.UserId == user.ID).OrderByDescending(s => s.Count).Take(20 + artstsCount / 30).Select(a => a.Track.Artist).ToList();
foreach (var u in users)
{
var aCount = db.Scrobbles.Where(ac => ac.ID == u.ID).Select(sc => sc.Track.Artist).Count();
var topA = db.Scrobbles.Where(s => s.ID == u.ID).OrderByDescending(s => s.Count).Take(20 + artstsCount / 30).Select(a => a.Track.Artist).ToList();
var intersectedCount = topArtists.Intersect(topA).Count();
similarUsers.Add(u, intersectedCount);
similarUsers = similarUsers.OrderByDescending(t => t.Value).Take(10).Select(t => new { t.Key, t.Value }).ToDictionary(t => t.Key, t => t.Value);
}
return(similarUsers);
}
}
public ActionResult RecommendUsers(string userName)
{
User user;
using (RecommenderContext db = new RecommenderContext())
{
user = db.Users.Where(u => u.Name == userName).FirstOrDefault();
}
Slope slope = new Slope();
var recommendedUsers = slope.GetRecommendations(user);
foreach (var u in recommendedUsers)
{
using (RecommenderContext db = new RecommenderContext())
{
db.UserToUser.Add(new UserToUser()
{
User1 = user,
User2 = u.Key
});
db.SaveChanges();
}
}
return(RedirectToAction("Index", new { userName = userName }));
}
public ActionResult FetchTags()
{
Service.ApiManager manager = new Service.ApiManager();
using (RecommenderContext db = new RecommenderContext())
{
var atists = db.Artists.ToList();
foreach (var artist in atists)
{
List <Service.Track> tracks = new List <Service.Track>();
var tags = manager.GetTags(artist.Name);
foreach (var tag in tags)
{
var newTag = new Tag()
{
Name = tag
};
db.Tags.AddIfNotExists(newTag, x => x.Name == tag);
db.SaveChanges();
var tagFromDb = db.Tags.Where(t => t.Name == tag).FirstOrDefault();
Artist_Tag a_t = new Artist_Tag()
{
Artist = artist, Tag = tagFromDb
};
db.Artist_Tags.Add(a_t);
db.SaveChanges();
}
//db.SaveChanges();
}
}
ViewBag.Message = "success: artists";
return(View("Index"));
}
public ActionResult FetchArtists()
{
Service.ApiManager manager = new Service.ApiManager();
using (RecommenderContext db = new RecommenderContext())
{
var users = db.Users.ToList();
foreach (var user in users)
{
List <Service.Track> tracks = new List <Service.Track>();
manager.GetTracks(user.Name, 1, tracks);
foreach (var track in tracks)
{
var artist = new Artist()
{
Name = track.artist.name
};
db.Artists.Add(artist);
db.Artists.AddIfNotExists(artist, x => x.Name == artist.Name);
db.SaveChanges();
}
db.SaveChanges();
}
}
ViewBag.Message = "success: artists";
return(View("Index"));
}
public ActionResult Index(string userName)
{
using (RecommenderContext db = new RecommenderContext())
{
var users = db.UserToUser.Where(u => u.User1.Name == userName).Select(x => x.User2).ToList();
return(View("Index", users));
}
}
public NBC()
{
using (RecommenderContext db = new RecommenderContext())
{
_tags = db.Tags.Select(t => t.ID).ToArray();
_artists = db.Artists.ToArray();
}
}
public ActionResult ArtistInfo(string artistName)
{
using (RecommenderContext db = new RecommenderContext())
{
var artist = db.Artists.Where(a => a.Name == artistName).FirstOrDefault();
var similarArtists = db.ArtistToArtist.Where(a => a.Artist1ID == artist.ID).Select(a => a.Artist2).ToList();
return(View("ArtistInfo", similarArtists));
}
}
public ActionResult MaintainArtist(string artistName)
{
using (RecommenderContext db = new RecommenderContext())
{
var artist = db.Artists.Where(a => a.Name == artistName).FirstOrDefault();
NBC nbc = new NBC();
var similarArtists = nbc.GetSimilarArtists(artist);
foreach (var sa in similarArtists)
{
db.ArtistToArtist.Add(new Recommender.Models.ArtistSimilarToArtist()
{
Artist1 = artist, Artist2 = sa.Key, Ratio = sa.Value
});
}
db.SaveChanges();
ViewBag.Message = "success: maintained artist:" + artistName;
return(View("Index"));
}
}
public ActionResult FetchUsers()
{
Service.ApiManager manager = new Service.ApiManager();
var users2 = manager.GetFriends("col403");
var users = manager.GetUsers("col403");
using (RecommenderContext db = new RecommenderContext())
{
foreach (var user in users)
{
db.Users.Add(new Recommender.Models.User()
{
Name = user.name
});
}
db.SaveChanges();
}
ViewBag.Message = "success: users";
return(View("Index"));
}
public Dictionary <Artist, double> GetSimilarArtists(Artist artist)
{
//double result = 1;
using (RecommenderContext db = new RecommenderContext())
{
_artistTags = db.Artists.Find(artist.ID).Artist_tags.Select(a => a.TagID).ToArray();
Dictionary <Artist, double> topSimilar = new Dictionary <Artist, double>();
for (int j = 0; j < _artists.Length - 1; j++)
{
int[] otherArtistTags;
//using (RecommenderContext db = new RecommenderContext())
//{
otherArtistTags = db.Artists.Find(_artists[j].ID).Artist_tags.Select(x => x.TagID).ToArray(); //.Artist_tags.Select(x => x.TagID);
//}
var goodTagsCount = otherArtistTags.Intersect(_artistTags).Count();
var artistP = ((double)goodTagsCount) / _tags.Count();
topSimilar.Add(_artists[j], artistP);
topSimilar = topSimilar.OrderByDescending(t => t.Value).Take(10).Select(t => new { t.Key, t.Value }).ToDictionary(t => t.Key, t => t.Value);
//for (int i = 0; i < _tags.Length; i++)
//{
// double tagP = 1;
// double goodTagCount = 0;
// if (_tags.Contains(_artists[j].))
// goodTagCount++;
// if (goodTagCount != 0)
// tagP = goodTagCount / _artistTags.Length;
//}
//result = result * tagP;
}
return(topSimilar);
}
//return result;
}
public ActionResult FetchTracks()
{
Service.ApiManager manager = new Service.ApiManager();
List <User> users;
using (RecommenderContext db = new RecommenderContext())
{
users = db.Users.Where(u => u.ID > 19).ToList();
}
foreach (var user in users)
{
List <Service.Track> tracks = new List <Service.Track>();
manager.GetTracks(user.Name, 1, tracks);
using (RecommenderContext db = new RecommenderContext())
{
foreach (var track in tracks)
{
var artist = db.Artists.Where(x => x.Name == track.artist.name).FirstOrDefault();
Track newTrack = new Track()
{
Name = track.name, Artist = artist
};
db.Tracks.AddIfNotExists(newTrack, x => x.Name == track.name);
db.SaveChanges();
var trackFromDb = db.Tracks.Where(x => x.Name == newTrack.Name).FirstOrDefault();
db.Scrobbles.Add(new Scrobble()
{
User = user, Count = Int32.Parse(track.playcount), Track = trackFromDb
});
db.SaveChanges();
}
}
}
ViewBag.Message = "success: tracks";
return(View("Index"));
}
