protected override FastIDSet doGetCandidateItems(long[] preferredItemIDs, IDataModel dataModel) {
FastIDSet candidateItemIDs = new FastIDSet();
foreach (long itemID in preferredItemIDs) {
candidateItemIDs.AddAll(similarity.AllSimilarItemIDs(itemID));
}
candidateItemIDs.RemoveAll(preferredItemIDs);
return candidateItemIDs;
}
protected override FastIDSet doGetCandidateItems(long[] preferredItemIDs, IDataModel dataModel) {
FastIDSet possibleItemIDs = new FastIDSet(dataModel.GetNumItems());
var allItemIDs = dataModel.GetItemIDs();
while (allItemIDs.MoveNext()) {
possibleItemIDs.Add(allItemIDs.Current);
}
possibleItemIDs.RemoveAll(preferredItemIDs);
return possibleItemIDs;
}
protected FastIDSet getAllOtherItems(long[] theNeighborhood, long theUserID) {
IDataModel dataModel = GetDataModel();
FastIDSet possibleItemIDs = new FastIDSet();
foreach (long userID in theNeighborhood) {
possibleItemIDs.AddAll(dataModel.GetItemIDsFromUser(userID));
}
possibleItemIDs.RemoveAll(dataModel.GetItemIDsFromUser(theUserID));
return possibleItemIDs;
}
protected override FastIDSet doGetCandidateItems(long[] preferredItemIDs, IDataModel dataModel)
{
FastIDSet candidateItemIDs = new FastIDSet();
foreach (long itemID in preferredItemIDs)
{
candidateItemIDs.AddAll(similarity.AllSimilarItemIDs(itemID));
}
candidateItemIDs.RemoveAll(preferredItemIDs);
return(candidateItemIDs);
}
protected override FastIDSet doGetCandidateItems(long[] preferredItemIDs, IDataModel dataModel) {
FastIDSet possibleItemsIDs = new FastIDSet();
foreach (long itemID in preferredItemIDs) {
IPreferenceArray itemPreferences = dataModel.GetPreferencesForItem(itemID);
int numUsersPreferringItem = itemPreferences.Length();
for (int index = 0; index < numUsersPreferringItem; index++) {
possibleItemsIDs.AddAll(dataModel.GetItemIDsFromUser(itemPreferences.GetUserID(index)));
}
}
possibleItemsIDs.RemoveAll(preferredItemIDs);
return possibleItemsIDs;
}
protected override FastIDSet doGetCandidateItems(long[] preferredItemIDs, IDataModel dataModel)
{
FastIDSet possibleItemIDs = new FastIDSet(dataModel.GetNumItems());
var allItemIDs = dataModel.GetItemIDs();
while (allItemIDs.MoveNext())
{
possibleItemIDs.Add(allItemIDs.Current);
}
possibleItemIDs.RemoveAll(preferredItemIDs);
return(possibleItemIDs);
}
protected FastIDSet getAllOtherItems(long[] theNeighborhood, long theUserID)
{
IDataModel dataModel = GetDataModel();
FastIDSet possibleItemIDs = new FastIDSet();
foreach (long userID in theNeighborhood)
{
possibleItemIDs.AddAll(dataModel.GetItemIDsFromUser(userID));
}
possibleItemIDs.RemoveAll(dataModel.GetItemIDsFromUser(theUserID));
return(possibleItemIDs);
}
protected override FastIDSet doGetCandidateItems(long[] preferredItemIDs, IDataModel dataModel)
{
FastIDSet possibleItemsIDs = new FastIDSet();
foreach (long itemID in preferredItemIDs)
{
IPreferenceArray itemPreferences = dataModel.GetPreferencesForItem(itemID);
int numUsersPreferringItem = itemPreferences.Length();
for (int index = 0; index < numUsersPreferringItem; index++)
{
possibleItemsIDs.AddAll(dataModel.GetItemIDsFromUser(itemPreferences.GetUserID(index)));
}
}
possibleItemsIDs.RemoveAll(preferredItemIDs);
return(possibleItemsIDs);
}
protected override FastIDSet doGetCandidateItems(long[] preferredItemIDs, IDataModel dataModel)
{
var preferredItemIDsIterator = ((IEnumerable <long>)preferredItemIDs).GetEnumerator();
if (preferredItemIDs.Length > maxItems)
{
double samplingRate = (double)maxItems / preferredItemIDs.Length;
log.Info("preferredItemIDs.Length {0}, samplingRate {1}", preferredItemIDs.Length, samplingRate);
preferredItemIDsIterator =
new SamplinglongPrimitiveIterator(preferredItemIDsIterator, samplingRate);
}
FastIDSet possibleItemsIDs = new FastIDSet();
while (preferredItemIDsIterator.MoveNext())
{
long itemID = preferredItemIDsIterator.Current;
IPreferenceArray prefs = dataModel.GetPreferencesForItem(itemID);
int prefsLength = prefs.Length();
if (prefsLength > maxUsersPerItem)
{
var sampledPrefs =
new FixedSizeSamplingIterator <IPreference>(maxUsersPerItem, prefs.GetEnumerator());
while (sampledPrefs.MoveNext())
{
addSomeOf(possibleItemsIDs, dataModel.GetItemIDsFromUser(sampledPrefs.Current.GetUserID()));
}
}
else
{
for (int i = 0; i < prefsLength; i++)
{
addSomeOf(possibleItemsIDs, dataModel.GetItemIDsFromUser(prefs.GetUserID(i)));
}
}
}
possibleItemsIDs.RemoveAll(preferredItemIDs);
return(possibleItemsIDs);
}
protected override FastIDSet doGetCandidateItems(long[] preferredItemIDs, IDataModel dataModel) {
var preferredItemIDsIterator = ((IEnumerable<long>)preferredItemIDs).GetEnumerator();
if (preferredItemIDs.Length > maxItems) {
double samplingRate = (double) maxItems / preferredItemIDs.Length;
log.Info("preferredItemIDs.Length {0}, samplingRate {1}", preferredItemIDs.Length, samplingRate);
preferredItemIDsIterator =
new SamplinglongPrimitiveIterator(preferredItemIDsIterator, samplingRate);
}
FastIDSet possibleItemsIDs = new FastIDSet();
while (preferredItemIDsIterator.MoveNext()) {
long itemID = preferredItemIDsIterator.Current;
IPreferenceArray prefs = dataModel.GetPreferencesForItem(itemID);
int prefsLength = prefs.Length();
if (prefsLength > maxUsersPerItem) {
var sampledPrefs =
new FixedSizeSamplingIterator<IPreference>(maxUsersPerItem, prefs.GetEnumerator());
while (sampledPrefs.MoveNext()) {
addSomeOf(possibleItemsIDs, dataModel.GetItemIDsFromUser(sampledPrefs.Current.GetUserID()));
}
} else {
for (int i = 0; i < prefsLength; i++) {
addSomeOf(possibleItemsIDs, dataModel.GetItemIDsFromUser(prefs.GetUserID(i)));
}
}
}
possibleItemsIDs.RemoveAll(preferredItemIDs);
return possibleItemsIDs;
}