This work is supported by the General Directorate of Culture, Education and University Management of Xunta de Galicia (Ref. GRC2014/049) and the European Fund for Regional Development (FEDER) allocated by the European Union, the Portuguese Foundation for Science and Technology for the development of project SBIRC (Ref. PTDC/EIA EIA/115667/2009), Xunta de Galicia (Ref. XUGA-PGIDIT-10TIC105008-PR) and the Spanish Ministry for Science and Technology (Ref. TIN2008-06562/TIN) and the Juan de la Cierva fellowship program by the Spanish Ministry of Economy and Competitiveness (Carlos Fernandez-Lozano, Ref. FJCI-2015-26071). NVIDIA Corporation donated the Titan Xp GPU used for this research.