1. A method to recognize instances of a model in a signal, the method comprising: providing an ensemble of reference patterns representative of the possible instances of said model; providing at least one generator of auxiliary descriptors for the recognition of said model; constructing an estimator for said model able to utilize said auxiliary descriptors; obtaining a clique of online descriptors relating to said signal; obtaining an executable generator of descriptors able to utilize said clique of online descriptors; generating a new descriptor with said executable generator and said clique of online descriptors; incorporating said new descriptor into a cache of online descriptors; repeating the last four steps until said executable generator is an estimator for said model and said new descriptor specifies an estimated pattern representative of a recognized instance of said model, or until it is established that no instances of said model are to be found in said signal.