Copyright (C) 2015-2017 Benjamin Paaßen, AG Machine Learning, Centre of Excellence Cognitive Interaction Technology (CITEC), University of Bielefeld, licensed under the GPL v. 3: https://gitlab.ub.uni-bielefeld.de/bpaassen/relational_neural_gas . This documentation is licensed under the conditions of CC-BY-SA 4.0: https://creativecommons.org/licenses/by-sa/4.0/