Editorial of Special Issue on WSOM+ 2017

WSOM+ 2017 was the 12th in a series of biannual international conferences started with WSOM '97 in Helsinki under the initiative of Prof. Teuvo Kohonen. WSOM + 2017 conference has been held in the renowned city of Nancy, world famous for its group of architectural masterpieces inscribed on the UNESCO World Heritage and for the highly creative twentieth century “Art Nouveau” movement. Conference was co-organized by SAMM laboratory, Paris Sorbonne and LORIA laboratory, Nancy. The 12th edition of the WSOM conference was for the first time extending its scope from the traditional domain on Self-Organizing Maps and Learning Vector Quantization to the general domain of Unsupervised Learning, as well as to the promising and hot research domain of Visualization.