Methods and algorithms pertaining to finding the shortest tour for a fully connected graph, i.e. solutions to the Travelling Salesman Problem.
At the moment, only Ant Colony Optimization has been implemented (https://en.wikipedia.org/wiki/Ant_colony_optimization_algorithms).
Dorigo, Marco, and Mauro Birattari. "Ant colony optimization." Encyclopedia of machine learning. Springer US, 2010. 36-39.