A training algorithm with selectable search direction for complex-valued feedforward neural networks

This paper focuses on presenting an efficient training algorithm for complex-valued feedforward neural networks by utilizing a tree structure. The basic idea of the proposed algorithm is that, by introducing a set of direction factors, distinctive search directions are available to be selected at each iteration such that the objective function is reduced as much as possible. Compared with some well-known training algorithms, one of the advantages of our algorithm is that the determination of search direction is of great flexibility and thus more accurate solution is obtained with faster convergence speed. Experimental simulations on pattern recognition, channel equalization and complex function approximation are provided to verify the effectiveness and applications of the proposed algorithm. (C) 2021 Elsevier Ltd. All rights reserved.