org.apache.mahout.cf.taste.impl.recommender
Class AbstractCandidateItemsStrategy
java.lang.Object
org.apache.mahout.cf.taste.impl.recommender.AbstractCandidateItemsStrategy
- All Implemented Interfaces:
- Refreshable, CandidateItemsStrategy, MostSimilarItemsCandidateItemsStrategy
- Direct Known Subclasses:
- AllSimilarItemsCandidateItemsStrategy, AllUnknownItemsCandidateItemsStrategy, PreferredItemsNeighborhoodCandidateItemsStrategy, SamplingCandidateItemsStrategy
public abstract class AbstractCandidateItemsStrategy
- extends Object
- implements CandidateItemsStrategy, MostSimilarItemsCandidateItemsStrategy
Abstract base implementation for retrieving candidate items to recommend
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
AbstractCandidateItemsStrategy
public AbstractCandidateItemsStrategy()
getCandidateItems
public FastIDSet getCandidateItems(long userID,
PreferenceArray preferencesFromUser,
DataModel dataModel)
throws TasteException
- Specified by:
getCandidateItems
in interface CandidateItemsStrategy
- Returns:
- IDs of all items that could be recommended to the user
- Throws:
TasteException
getCandidateItems
public FastIDSet getCandidateItems(long[] itemIDs,
DataModel dataModel)
throws TasteException
- Specified by:
getCandidateItems
in interface MostSimilarItemsCandidateItemsStrategy
- Throws:
TasteException
doGetCandidateItems
protected abstract FastIDSet doGetCandidateItems(long[] preferredItemIDs,
DataModel dataModel)
throws TasteException
- Throws:
TasteException
refresh
public void refresh(Collection<Refreshable> alreadyRefreshed)
- Description copied from interface:
Refreshable
Triggers "refresh" -- whatever that means -- of the implementation. The general contract is that any
Refreshable
should always leave itself in a consistent, operational state, and that the refresh
atomically updates internal state from old to new.
- Specified by:
refresh
in interface Refreshable
- Parameters:
alreadyRefreshed
- Refreshable
s that are known to have already been
refreshed as a result of an initial call to a Refreshable.refresh(Collection)
method on some
object. This ensure that objects in a refresh dependency graph aren't refreshed twice
needlessly.
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