Pareto-based Island Model presented at GECCO 2013

Yesterday I presented my work Migration Study on a Pareto-based Island Model for MOACOs, accepted as full-paper at the Genetic and Evolutionary Computation Conference 2013, held in Amsterdam.

The paper abstract is:

Pareto-based island model is a multi-colony distribution scheme recently presented for the resolution, by means of ant colony optimization algorithms, of bi-criteria problems. It yielded very promising results, but the model was implemented considering a unique Pareto-front-shaped unidirectional neighborhood migration topology, and a constant migration rate.
In the present work two additional neighborhood topology schemes, and four different migration rates have been tested, considering the algorithm which obtained the best results in average in the model presentation article: MOACS (Multi-Objective Ant Colony System).
Several experiments have been conducted, including statistical tests for better support the study.
High values for the migration rate and the use of a bidirectional neighborhood migration topology yields the best results.

It is the next step in the research previously published in Soft Computing Journal and commented here.

The presentation is this:

Enjoy it! :D

Parallel Ants at IWANN 2011

Some days ago we presented at the IWANN Conference our new work devoted to study the parallelization of Multi-Objective Ant Colony Optimization algorithms (MOACOs) following different schemes.

It was a very funny presentation (and very interesting, of course :D), because the slides included some CC memes. ;)

These are the slides:

The whole paper can be found here.

Enjoy them! ;)

Military Ants at NICSO 2010

Hi to all!
(the milliards of readers :D).

The last Wednesday (13 of May), we presented (again) our Multiobjective Ant Colony Optimization algorithm (yes, the famous CHAC :D) at NICSO 2010, which was held in Granada, in the same building where we work everyday…
… what a so far trip… :-| :D

The paper presents a study of the objective balancing parameter (named LAMBDA), used in this algorithm. ;)

Here you are the presentation:

Enjoy it! ;)

KohonAnts Slides (ALIFE XI)

Hello again to everyone!

These are the slides of the presentation of KohonAnts algorithm in ALIFE XI conference. ;)

It is an hybrid Ant Colony and Self-organizing Map algorithm for clustering and pattern classification.

A bit late, but I had some troubles with slideshare…

In any case…….Enjoy it. ;) :D

Here you can see an example of the evolution of the ants in the grid for the IRIS dataset:

Ants movement in the toroidal grid

Ants movement in the toroidal grid

Green class is quite similar to the other two classes, so it is difficult to get a fine cluster with it.

Thanks to Dave Oranchak. ;)

New paper on multiobjective ant colony optimization available

Springer alerts me about the availability of the paper hCHAC-4, an ACO Algorithm for Solving the Four-Criteria Military Path-finding Problem, which was published some time ago at the NICSO 2007 conference. Here’s the abstract:

Algorithms for decision support in the battlefield have to take into account separately all factors with an impact of success: speed, visibility, and consumption of material and human resources. It is usual to combine several objectives, since military commanders give more importance to some factors than others, but it is interesting to also explore and optimize all objectives at the same time, to have a wider range of possible solutions to choose from, and explore more efficiently the space of all possible paths. In this paper we introduce hCHAC-4, the four-objective version of the hCHAC bi-objective ant colony optimization algorithm, and compare results obtained with them and also with some other approaches (extreme and mono-objective ones). It is concluded that this new version of the algorithm is more robust, and covers more efficiently the Pareto front of all possible solutions, so it can be consider as a better tool for military decision support.

If SpringerLink is not available at your institution and you are interested in a copy, please drop us a line. This article is further ahead the research line than the previous article, which used two objectives that were an aggregate of several sub-objectives. Results are better in this case, and all sub-objectives can be pursued at the same time.

New paper on multiobjective ant colony optimization available online

This is the paper we presented at the ECAL 2007 conference. Its title is Comparing ACO Algorithms for Solving the Bi-criteria Military Path-Finding Problem, and it deals with one of our lines of work, using ant-colony algorithms to show the way to a (peaceful and unarmed) military unit.