| public Predict ( int user_id, int item_id ) : double | ||
| user_id | int | |
| item_id | int | |
| return | double | |
public override double Predict(int user_id, int item_id)
{
if ((user_id < 0) || (user_id >= nearest_neighbors.Length))
throw new ArgumentException("User is unknown: " + user_id);
if ((item_id < 0) || (item_id > MaxItemID))
throw new ArgumentException("Item is unknown: " + item_id);
int count = 0;
foreach (int neighbor in nearest_neighbors[user_id])
{
if (Feedback.UserMatrix[neighbor, item_id])
count++;
}
return (double) count / k;
}