public double Calculate(int itemA, int itemB)
{
double theta = 0.9d;
IItemSimilarity collaborateSimilarity = new ItemCollaborativeSimilarity();
IItemSimilarity genreSimilarity = new ItemGenreSimilarity();
return theta * collaborateSimilarity.Calculate(itemA, itemB) + (1 - theta) * genreSimilarity.Calculate(itemA, itemB);
}
public double Calculate(int itemA, int itemB)
{
double theta = 0.9d;
IItemSimilarity collaborateSimilarity = new ItemCollaborativeSimilarity();
IItemSimilarity genreSimilarity = new ItemGenreSimilarity();
return(theta * collaborateSimilarity.Calculate(itemA, itemB) + (1 - theta) * genreSimilarity.Calculate(itemA, itemB));
}
public Dictionary<int, double> GetNNSimilarity(int itemId)
{
IItemSimilarity itemSimilarity = new ItemCollaborativeSimilarity();
foreach (var otherItemId in this.allItems)
{
double similarity = itemSimilarity.Calculate(itemId, otherItemId);
this.OtherItemsSimilarity.Add(otherItemId, similarity);
}
//do something to choose the k highest similar items
return this.OtherItemsSimilarity;
}
