Time-Scaling in Recurrent Neural Learning

Recurrent Backpropagation schemes for fixed point learning in continuous-time dynamic neural networks can be formalized through a differential-algebraic model, which in turn leads to singularly perturbed training techniques. Such models clarify the relative time-scaling between the network evolution and the adaptation dynamics, and allow for rigorous local convergence proofs. The present contribution addresses some related issues in a discrete-time context: fixed point problems can be analyzed in terms of iterations with different evolution rates, whereas periodic trajectory learning can be reduced to a multiple fixed point learning problem via Poincare maps.