public override long[] GetUserNeighborhood(long userID)
{
IDataModel dataModel = getDataModel();
IUserSimilarity userSimilarityImpl = getUserSimilarity();
TopItems.IEstimator <long> estimator = new Estimator(userSimilarityImpl, userID, minSimilarity);
var userIDs = SamplinglongPrimitiveIterator.MaybeWrapIterator(dataModel.GetUserIDs(),
getSamplingRate());
return(TopItems.GetTopUsers(n, userIDs, null, estimator));
}