private void readDataset(String filename, String delimiter)
{
FileInput in = new FileInput(filename);
while (in.hasNextLine())
{
String[] split = in.nextLine().split(delimiter);
int user = Integer.valueOf(split[0]);
int item = Integer.valueOf(split[1]);
double rating = Double.valueOf(split[2]);
super.setRating(user, item, rating);