8. The method according to claim 1 , wherein in said identifying of said one or more target vectors with respect to an input vector, said checking is performed for at least several candidate vectors of said plurality of candidate vectors, and wherein in each said checking, the same reference vector is used, and wherein said distance between said candidate vector and said reference vector is retrieved from a memory that comprises distances between said reference vector and all candidate vectors of said plurality of candidate vectors.
8. The method according to claim 1 , wherein in said identifying of said one or more target vectors with respect to an input vector, said checking is performed for at least several candidate vectors of said plurality of candidate vectors, and wherein in each said checking, the same reference vector is used, and wherein said distance between said candidate vector and said reference vector is retrieved from a memory that comprises distances between said reference vector and all candidate vectors of said plurality of candidate vectors. 9. The method according to claim 8 , wherein in said identifying of said one or more target vectors with respect to an input vector, said distance between said reference vector and said at least sorted representation of said input vector is only computed once.