Abstract: The present description concerns a circuit comprising: a number generator (205) configured to generate a sequence of vectors (207, 219) of size , the vector sequence being the same at each start-up of the number generator; a memory (211) configured to store a set of first parameters (?) of an auxiliary neural network (204); a processing device configured to generate a set of second parameters of a layer (201) of a main neural network by the application a plurality of times of a first operation (g), by the auxiliary neural network, performing a generation operation from each vector generated by the number generator, each generation delivering a vector of second parameters, the set of the vectors of second parameters forming said set of second parameters; and wherein the number of second parameters is greater than the number of first parameters.