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Interface implemented by "clustering" recommenders.

public interface ClusteringRecommender extends Recommender {


Returns the cluster of users to which the given user, denoted by user ID, belongs.

userID user ID for which to find a cluster
java.util.Collection of IDs of users in the requested user's cluster
Throws: if an error occurs while accessing the
  FastIDSet getCluster(long userIDthrows TasteException;


Returns all clusters of users.

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