async Task <KMeansData> StandardiseData(UserModel model)
{
//TODO: range age, avg age | max 1 min 0 avg of interests
KMeansStatistics statistics = await GetStatistics();
KMeansData kuser = new KMeansData
{
Id = model.Id,
Hobbies = { ["Age"] = (model.Age - statistics.AvgAge) / statistics.AgeRange }
};
foreach (var userInterest in model.Interests)
{
kuser.Hobbies[userInterest] = 1;
}
//await _database.KMeansInsert(kuser);
// finalizing the data
KMeansData sample = new KMeansData();
foreach (var hobby in sample.Hobbies.Keys)
{
kuser.Hobbies[hobby] =
(kuser.Hobbies[hobby] - statistics.HobbiesAverages[hobby]) / statistics.HobbiesRange;
}
return(kuser);
}
async Task <KMeansStatistics> GetStatistics()
{
var users = await GetUsers();
KMeansStatistics statistics = new KMeansStatistics();
//if(await _database.GetCollection<KMeansStatistics>("KMeansStatistics").Find(_ => true).FirstOrDefaultAsync() != null) return await _database.GetCollection<KMeansStatistics>("KMeansStatistics").Find(_ => true).FirstOrDefaultAsync();
if (users.Count != 0 && users.Count % 300 == 0) // testing purposes / update statistics each 300 users to get accurate centroids
{
statistics.AgeRange = _database.GetCollection <UserModel>("Users").Find(_ => true)
.Sort(Builders <UserModel> .Sort.Descending("Age")).FirstOrDefault().Age -
_database.GetCollection <UserModel>("Users").Find(_ => true)
.Sort(Builders <UserModel> .Sort.Ascending("Age")).FirstOrDefault().Age;
double avgAge = 0;
foreach (var userModel in users)
{
avgAge += userModel.Age;
}
statistics.AvgAge = avgAge / users.Count;
// Hobbies average
KMeansData sumOfInterests = new KMeansData();
foreach (var user in users)
{
foreach (var userInterest in user.Interests)
{
sumOfInterests.Hobbies[userInterest] += 1;
}
}
// average for each hobby
foreach (var interest in sumOfInterests.Hobbies.Keys)
{
statistics.HobbiesAverages[interest] = sumOfInterests.Hobbies[interest] / users.Count;
}
await _database.DropCollectionAsync("KMeansStatistics");
await _database.GetCollection <KMeansStatistics>("KMeansStatistics").InsertOneAsync(statistics);
return(statistics);
}
else
{
return(await _database.GetCollection <KMeansStatistics>("KMeansStatistics").Find(_ => true).FirstOrDefaultAsync());
}
}