public Tuple <int, List <Neighbor> > NearestNeighbor(Dictionary <int, Dictionary <int, double> > data, int target, double threshold = 0.35, int amount = 3)
{
List <Neighbor> neighbors = new List <Neighbor>();
var currentThreshold = threshold;
if (data.ContainsKey(target))
{
foreach (var user in data)
{
if (user.Key != target)
{
var filterData = DataParser.splitDictionaries(DataParser.filterData(data, target, user.Key, this.delete));
double result = strategy.algorithm(filterData);
var dataaaa = data[target];
if (result > currentThreshold && user.Value.Except(data[target]).Count() > 0)
{
if (neighbors.Count == amount)
{
var lowestNeighbor = neighbors.Aggregate((item1, item2) => item1.similarity < item2.similarity ? item1 : item2);
neighbors.Remove(lowestNeighbor);
neighbors.Add(new Neighbor(user.Key, result, user.Value));
currentThreshold = neighbors.Aggregate((item1, item2) => item1.similarity < item2.similarity ? item1 : item2).similarity;
}
else
{
neighbors.Add(new Neighbor(user.Key, result, user.Value));
}
}
}
}
return(new Tuple <int, List <Neighbor> >(target, neighbors));
}
else
{
return(new Tuple <int, List <Neighbor> >(target, new List <Neighbor>()));
}
}
public static void printData(int user1, int user2)
{
int[] users = { user1, user2 };
StrategyContext strategy1 = new StrategyContext(new Euclidian());
StrategyContext strategy2 = new StrategyContext(new Manhattan());
StrategyContext strategy3 = new StrategyContext(new Pearsson());
var data = DataParser.filterData(DataParser.write2DArray("./userData.data", ","), users[0], users[1], true);
var dataNoDel = DataParser.filterData(data, users[0], users[1], false);
var tuple = DataParser.splitDictionaries(data);
var tupleNoDel = DataParser.splitDictionaries(dataNoDel);
////////////////////// FRONTEND \\\\\\\\\\\\\\\\\\\\\\
Console.WriteLine("User " + users[0].ToString() + " -VS- User " + users[1].ToString());
Console.WriteLine("Euclidian - " + strategy1.algorithm(tuple).ToString());
Console.WriteLine("Manhattan - " + strategy2.algorithm(tuple).ToString());
Console.WriteLine("Pearsson - " + strategy3.algorithm(tupleNoDel).ToString());
Console.WriteLine();
}
static Dictionary <int, Dictionary <int, double> > getData()
{
return(DataParser.write2DArray("./userItem.data", ","));
//return DataParser.write2DArray_MovieLens("./ratings.csv");
}
