Machine Learning, Optimization, and Data Science 4th International Conference, LOD 2018, Volterra, Italy, September 13-16, 2018, Revised Selected Papers - Nicosia, Giuseppe; Nicosia, Giuseppe; Pardalos, Panos; Pardalos, Panos; Giuffrida, Giovanni; Giuffrida, Giovanni; Umeton, Renato; Umeton, Renato; Sciacca, Vincenzo; Sciacca, Vincenzo (Springer International Publishing : Imprint: Springer, 2019)