A fast online learning algorithm for recurrent neural networks

The authors present arguments for a fast online training algorithm for recurrent neural networks. They present an algorithm that would require O(N³) calculations to update the weights in one time step, which is faster than all other known online training algorithms. They formulate the derivations of this algorithm in a variational approach which has the advantage of providing a unified view of the various algorithms that were derived by a number of researchers from very different circumstances