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Implementations of this interface define a notion of similarity between two users. Implementations should return values in the range -1.0 to 1.0, with 1.0 representing perfect similarity.

See also:
public interface UserSimilarity extends Refreshable {


Returns the degree of similarity, of two users, based on the their preferences.

userID1 first user ID
userID2 second user ID
similarity between the two users, in [-1,1]
Throws: if an error occurs while accessing the data
  double userSimilarity(long userID1long userID2throws TasteException;


Attaches a PreferenceInferrer to the UserSimilarity implementation.

inferrer PreferenceInferrer
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