com.cloudera.oryx.app.als

Class MultiRescorer

java.lang.Object

com.cloudera.oryx.app.als.MultiRescorer

All Implemented Interfaces:

Rescorer

public final class MultiRescorer
extends Object
implements Rescorer

Convenience implementation that will aggregate the behavior of multiple Rescorers. It will filter an item if any of the given instances filter it, and will rescore by applying the rescorings in the given order.

Since:

2.0.0

See Also:

MultiRescorerProvider

Method Summary

Modifier and Type	Method and Description
boolean	isFiltered(String itemID)
static Rescorer	of(Rescorer... rescorers)
double	rescore(String itemID, double value)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

of

public static Rescorer of(Rescorer... rescorers)

Parameters:

rescorers - Rescorers to aggregate

Returns:

a Rescorer which combines the rescoring of the given implementations

Throws:

IllegalArgumentException - if rescorers is empty or null

Since:

2.0.0

rescore

public double rescore(String itemID,
                      double value)

Specified by:

rescore in interface Rescorer

Parameters:

itemID - ID of item to rescore

value - original score from the recommender

Returns:

new score; return Double.NaN to exclude the item from recommendation

isFiltered

public boolean isFiltered(String itemID)

Specified by:

isFiltered in interface Rescorer

Parameters:

itemID - of item to consider for filtering

Returns:

true iff the item should be removed from consideration