5. The method of claim 1 , wherein each interaction between any pair of elements modifies at least one of the ranking vectors corresponding to the pair of interacting elements, the pair of interacting elements being 1) any two elements of the first data set, 2) any two elements of the second data set, or 3) an element of the first data set and an element of the second data set.
5. The method of claim 1 , wherein each interaction between any pair of elements modifies at least one of the ranking vectors corresponding to the pair of interacting elements, the pair of interacting elements being 1) any two elements of the first data set, 2) any two elements of the second data set, or 3) an element of the first data set and an element of the second data set. 6. The method of claim 5 , wherein each component a j of the at least one ranking vector a is incremented by an amount proportional to a difference between components a j and u j of the ranking vectors a and u, the amount being computed from κ*(u j −a j ), κ being an interaction coefficient.