public void testStrategy()
{
FastIDSet allItemIDs = new FastIDSet();
allItemIDs.AddAll(new long[] { 1L, 2L, 3L });
FastIDSet preferredItemIDs = new FastIDSet(1);
preferredItemIDs.Add(2L);
var dataModelMock = new DynamicMock( typeof( IDataModel ));
dataModelMock.ExpectAndReturn("GetNumItems", 3);
dataModelMock.ExpectAndReturn("GetItemIDs", allItemIDs.GetEnumerator());
IPreferenceArray prefArrayOfUser123 = new GenericUserPreferenceArray( new List<IPreference>() {
new GenericPreference(123L, 2L, 1.0f) } );
ICandidateItemsStrategy strategy = new AllUnknownItemsCandidateItemsStrategy();
//EasyMock.replay(dataModel);
FastIDSet candidateItems = strategy.GetCandidateItems(123L, prefArrayOfUser123, (IDataModel)dataModelMock.MockInstance);
Assert.AreEqual(2, candidateItems.Count() );
Assert.True(candidateItems.Contains(1L));
Assert.True(candidateItems.Contains(3L));
dataModelMock.Verify();
//EasyMock.verify(dataModel);
}
public void testStrategy()
{
FastIDSet allItemIDs = new FastIDSet();
allItemIDs.AddAll(new long[] { 1L, 2L, 3L });
FastIDSet preferredItemIDs = new FastIDSet(1);
preferredItemIDs.Add(2L);
var dataModelMock = new DynamicMock(typeof(IDataModel));
dataModelMock.ExpectAndReturn("GetNumItems", 3);
dataModelMock.ExpectAndReturn("GetItemIDs", allItemIDs.GetEnumerator());
IPreferenceArray prefArrayOfUser123 = new GenericUserPreferenceArray(new List <IPreference>()
{
new GenericPreference(123L, 2L, 1.0f)
});
ICandidateItemsStrategy strategy = new AllUnknownItemsCandidateItemsStrategy();
//EasyMock.replay(dataModel);
FastIDSet candidateItems = strategy.GetCandidateItems(123L, prefArrayOfUser123, (IDataModel)dataModelMock.MockInstance);
Assert.AreEqual(2, candidateItems.Count());
Assert.True(candidateItems.Contains(1L));
Assert.True(candidateItems.Contains(3L));
dataModelMock.Verify();
//EasyMock.verify(dataModel);
}
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 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 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);
}
private void addSomeOf(FastIDSet possibleItemIDs, FastIDSet itemIDs)
{
if (itemIDs.Count() > maxItemsPerUser)
{
var it =
new SamplinglongPrimitiveIterator(itemIDs.GetEnumerator(), (double)maxItemsPerUser / itemIDs.Count());
while (it.MoveNext())
{
possibleItemIDs.Add(it.Current);
}
}
else
{
possibleItemIDs.AddAll(itemIDs);
}
}
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);
}
/// <p>
/// Creates a new {@link GenericDataModel} from the given users (and their preferences). This
/// {@link DataModel} retains all this information in memory and is effectively immutable.
/// </p>
///
/// @param userData users to include
/// @param timestamps optionally, provided timestamps of preferences as milliseconds since the epoch.
/// User IDs are mapped to maps of item IDs to long timestamps.
public GenericBooleanPrefDataModel(FastByIDMap <FastIDSet> userData, FastByIDMap <FastByIDMap <DateTime?> > timestamps)
{
//Preconditions.checkArgument(userData != null, "userData is null");
this.preferenceFromUsers = userData;
this.preferenceForItems = new FastByIDMap <FastIDSet>();
FastIDSet itemIDSet = new FastIDSet();
foreach (var entry in preferenceFromUsers.EntrySet())
{
long userID = entry.Key;
FastIDSet itemIDs1 = entry.Value;
itemIDSet.AddAll(itemIDs1);
var it = itemIDs1.GetEnumerator();
while (it.MoveNext())
{
long itemID = it.Current;
FastIDSet userIDs1 = preferenceForItems.Get(itemID);
if (userIDs1 == null)
{
userIDs1 = new FastIDSet(2);
preferenceForItems.Put(itemID, userIDs1);
}
userIDs1.Add(userID);
}
}
this.itemIDs = itemIDSet.ToArray();
itemIDSet = null; // Might help GC -- this is big
Array.Sort(itemIDs);
this.userIDs = new long[userData.Count()];
int i = 0;
var it1 = userData.Keys.GetEnumerator();
while (it1.MoveNext())
{
userIDs[i++] = it1.Current;
}
Array.Sort(userIDs);
this.timestamps = timestamps;
}
/// <p>
/// Creates a new {@link GenericDataModel} from the given users (and their preferences). This
/// {@link DataModel} retains all this information in memory and is effectively immutable.
/// </p>
///
/// @param userData users to include
/// @param timestamps optionally, provided timestamps of preferences as milliseconds since the epoch.
/// User IDs are mapped to maps of item IDs to long timestamps.
public GenericBooleanPrefDataModel(FastByIDMap<FastIDSet> userData, FastByIDMap<FastByIDMap<DateTime?>> timestamps) {
//Preconditions.checkArgument(userData != null, "userData is null");
this.preferenceFromUsers = userData;
this.preferenceForItems = new FastByIDMap<FastIDSet>();
FastIDSet itemIDSet = new FastIDSet();
foreach (var entry in preferenceFromUsers.EntrySet()) {
long userID = entry.Key;
FastIDSet itemIDs1 = entry.Value;
itemIDSet.AddAll(itemIDs1);
var it = itemIDs1.GetEnumerator();
while (it.MoveNext()) {
long itemID = it.Current;
FastIDSet userIDs1 = preferenceForItems.Get(itemID);
if (userIDs1 == null) {
userIDs1 = new FastIDSet(2);
preferenceForItems.Put(itemID, userIDs1);
}
userIDs1.Add(userID);
}
}
this.itemIDs = itemIDSet.ToArray();
itemIDSet = null; // Might help GC -- this is big
Array.Sort(itemIDs);
this.userIDs = new long[userData.Count()];
int i = 0;
var it1 = userData.Keys.GetEnumerator();
while (it1.MoveNext()) {
userIDs[i++] = it1.Current;
}
Array.Sort(userIDs);
this.timestamps = timestamps;
}
private void addSomeOf(FastIDSet possibleItemIDs, FastIDSet itemIDs) {
if (itemIDs.Count() > maxItemsPerUser) {
var it =
new SamplinglongPrimitiveIterator(itemIDs.GetEnumerator(), (double) maxItemsPerUser / itemIDs.Count() );
while (it.MoveNext()) {
possibleItemIDs.Add(it.Current);
}
} else {
possibleItemIDs.AddAll(itemIDs);
}
}
