Maximizing the Zero-Error Density for RTRL

A new learning principle was introduced recently called the Zero-Error Density Maximization (Z-EDM) and was proposed in the framework of MLP backpropagation. In this paper we present the adaptation of this principle to online learning in recurrent neural networks, more precisely, to the Real Time Recurrent Learning (RTRL) approach. We show how to modify the RTRL learning algorithm in order to make it learn using Z-EDM criteria by using a sliding time window of previous error values. We present experiments showing that this new approach improves the convergence rate of the RNNs and improves the prediction performance in time series forecast.