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Implementations of this interface compute an inferred preference for a user and an item that the user has not expressed any preference for. This might be an average of other preferences scores from that user, for example. This technique is sometimes called "default voting".

public interface PreferenceInferrer extends Refreshable {


Infers the given user's preference value for an item.

userID ID of user to infer preference for
itemID item ID to infer preference for
inferred preference
Throws: if an error occurs while inferring
  float inferPreference(long userIDlong itemIDthrows TasteException;
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