“…Some of them have exhibited good results, mainly attained by using ACO-or PSO-based approaches, such as [11,1,2,24,25,26]. In [3] and [4], a new approach to feature selection based on the ACO and PSO methodologies is presented. The chief thought is the split of the search process accomplished by the agents (ants or particles) into two stages, such that an agent is commanded in the first stage to find a partial solution to the problem, which in turn is afterwards used as an initial state during the upcoming phase.…”