protected ItemItemSimilarity computeNext()
{
int size = itemIDs.Length;
ItemItemSimilarity result = null;
while (result == null && i < size - 1)
{
long itemID2 = itemIDs[j];
double similarity;
try {
similarity = otherSimilarity.ItemSimilarity(itemID1, itemID2);
} catch (TasteException te) {
// ugly:
throw new InvalidOperationException(te.Message, te);
}
if (!Double.IsNaN(similarity))
{
result = new ItemItemSimilarity(itemID1, itemID2, similarity);
}
if (++j == size)
{
itemID1 = itemIDs[++i];
j = i + 1;
}
}
return(result);
}
public double Estimate(long itemID)
{
Tuple <long, long> pair = new Tuple <long, long>(toItemID, itemID);
if (rescorer != null && rescorer.IsFiltered(pair))
{
return(Double.NaN);
}
double originalEstimate = similarity.ItemSimilarity(toItemID, itemID);
return(rescorer == null ? originalEstimate : rescorer.Rescore(pair, originalEstimate));
}
public Double Get(Tuple <long, long> key)
{
return(similarity.ItemSimilarity(key.Item1, key.Item2));
}