/// <summary>
/// Creates the W matrix that contains probabilities that user visits POI l when l' has been visited.
/// </summary>
private void createWMatrix()
{
alglib.sparsecreate(idLocMapper.Keys.Max() + 1, idLocMapper.Keys.Max() + 1, out this.W);
foreach (int id1 in ratings.AllItems)
{
try{
if (nearestNeighbors[id1].Count < k)
{
Console.WriteLine("Unter 100!!");
throw new Exception();
}
foreach (int id2 in nearestNeighbors[id1])
{
if (id1 == id2)
{
throw new Exception();
}
alglib.sparseset(this.W, id1, id2, getDistanceProbability(id1, id2));
}
}catch (Exception e) {
}
}
alglib.sparseconverttocrs(W);
W.normalize(ratings.AllItems, k);
}