Advances in Computational Intelligence 15th International Work-Conference on Artificial Neural Networks, IWANN 2019, Gran Canaria, Spain, June 12-14, 2019, Proceedings, Part II - Rojas, Ignacio; Rojas, Ignacio; Joya, Gonzalo; Joya, Gonzalo; Catala, Andreu; Catala, Andreu (Springer International Publishing : Imprint: Springer, 2019)