In GA experiments, do we use many individual robots or use just 1 robot and change the generations through software? Which approach is more common?

For example, in this experiment (http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.133.9324&rep=rep1&type=pdf), did they use only 1 robot or more than 1? If it is only 1 robot, what does...

11 November 2013 3,330 6 View