public double getSimilarity(FastIDSet cluster1, FastIDSet cluster2)
{
if (cluster1.isEmpty() || cluster2.isEmpty())
{
return(Double.NaN);
}
double leastSimilarity = Double.PositiveInfinity;
var someUsers = SamplingLongPrimitiveIterator.maybeWrapIterator(cluster1.GetEnumerator(), samplingRate);
while (someUsers.MoveNext())
{
long userID1 = someUsers.Current;
var it2 = cluster2.GetEnumerator();
while (it2.MoveNext())
{
double theSimilarity = similarity.userSimilarity(userID1, it2.Current);
if (theSimilarity < leastSimilarity)
{
leastSimilarity = theSimilarity;
}
}
}
// We skipped everything? well, at least try comparing the first Users to get some value
if (leastSimilarity == Double.PositiveInfinity)
{
return(similarity.userSimilarity(cluster1.GetEnumerator().Current, cluster2.GetEnumerator().Current));
}
return(leastSimilarity);
}