public static List <RecommendedItem> getTopItems(int howMany, IEnumerator <long> possibleItemIDs, IDRescorer rescorer, Estimator <long> estimator)
{
SortedSet <RecommendedItem> collection = new SortedSet <RecommendedItem>(ByValueRecommendedItemComparator.getReverseInstance());
bool flag = false;
double negativeInfinity = double.NegativeInfinity;
while (possibleItemIDs.MoveNext())
{
long current = possibleItemIDs.Current;
if ((rescorer == null) || !rescorer.isFiltered(current))
{
double num3;
try
{
num3 = estimator.estimate(current);
}
catch (NoSuchItemException)
{
continue;
}
double d = (rescorer == null) ? num3 : rescorer.rescore(current, num3);
if (!double.IsNaN(d) && (!flag || (d > negativeInfinity)))
{
collection.Add(new GenericRecommendedItem(current, (float)d));
if (flag)
{
collection.Remove(collection.Min);
}
else if (collection.Count > howMany)
{
flag = true;
collection.Remove(collection.Min);
}
negativeInfinity = collection.Min.getValue();
}
}
}
int count = collection.Count;
if (count == 0)
{
return(new List <RecommendedItem>());
}
List <RecommendedItem> list = new List <RecommendedItem>(count);
list.AddRange(collection);
list.Reverse();
return(list);
}
public static long[] getTopUsers(int howMany, IEnumerator <long> allUserIDs, IDRescorer rescorer, Estimator <long> estimator)
{
SortedSet <SimilarUser> set = new SortedSet <SimilarUser>();
bool flag = false;
double negativeInfinity = double.NegativeInfinity;
while (allUserIDs.MoveNext())
{
long current = allUserIDs.Current;
if ((rescorer == null) || !rescorer.isFiltered(current))
{
double num3;
try
{
num3 = estimator.estimate(current);
}
catch (NoSuchUserException)
{
continue;
}
double d = (rescorer == null) ? num3 : rescorer.rescore(current, num3);
if (!double.IsNaN(d) && (!flag || (d > negativeInfinity)))
{
set.Add(new SimilarUser(current, d));
if (flag)
{
set.Remove(set.Max);
}
else if (set.Count > howMany)
{
flag = true;
set.Remove(set.Max);
}
negativeInfinity = set.Max.getSimilarity();
}
}
}
int count = set.Count;
if (count == 0)
{
return(NO_IDS);
}
List <SimilarUser> list = new List <SimilarUser>(count);
return((from s in set select s.getUserID()).ToArray <long>());
}