org.apache.mahout.cf.taste.impl.recommender
Class GenericBooleanPrefItemBasedRecommender
java.lang.Object
org.apache.mahout.cf.taste.impl.recommender.AbstractRecommender
org.apache.mahout.cf.taste.impl.recommender.GenericItemBasedRecommender
org.apache.mahout.cf.taste.impl.recommender.GenericBooleanPrefItemBasedRecommender
- All Implemented Interfaces:
- Refreshable, ItemBasedRecommender, Recommender
public final class GenericBooleanPrefItemBasedRecommender
- extends GenericItemBasedRecommender
A variant on GenericItemBasedRecommender
which is appropriate for use when no notion of preference
value exists in the data.
- See Also:
GenericBooleanPrefUserBasedRecommender
Method Summary |
protected float |
doEstimatePreference(long userID,
PreferenceArray preferencesFromUser,
long itemID)
This computation is in a technical sense, wrong, since in the domain of "boolean preference users" where
all preference values are 1, this method should only ever return 1.0 or NaN. |
String |
toString()
|
Methods inherited from class org.apache.mahout.cf.taste.impl.recommender.GenericItemBasedRecommender |
estimatePreference, getDefaultMostSimilarItemsCandidateItemsStrategy, getSimilarity, mostSimilarItems, mostSimilarItems, mostSimilarItems, mostSimilarItems, mostSimilarItems, mostSimilarItems, recommend, recommendedBecause, refresh |
GenericBooleanPrefItemBasedRecommender
public GenericBooleanPrefItemBasedRecommender(DataModel dataModel,
ItemSimilarity similarity)
GenericBooleanPrefItemBasedRecommender
public GenericBooleanPrefItemBasedRecommender(DataModel dataModel,
ItemSimilarity similarity,
CandidateItemsStrategy candidateItemsStrategy,
MostSimilarItemsCandidateItemsStrategy mostSimilarItemsCandidateItemsStrategy)
doEstimatePreference
protected float doEstimatePreference(long userID,
PreferenceArray preferencesFromUser,
long itemID)
throws TasteException
- This computation is in a technical sense, wrong, since in the domain of "boolean preference users" where
all preference values are 1, this method should only ever return 1.0 or NaN. This isn't terribly useful
however since it means results can't be ranked by preference value (all are 1). So instead this returns a
sum of similarities.
- Overrides:
doEstimatePreference
in class GenericItemBasedRecommender
- Throws:
TasteException
toString
public String toString()
- Overrides:
toString
in class GenericItemBasedRecommender
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