## Java Continuous Optimization Library

JCool is an open-source Java library for continuous optimization. It implements both numerical (Gradient Descent, Conjugated Gradients, Quasi-Newton,..) and nature-inspired (Evolutionary, PSO, ACO,.. ) algorithms. We have included a huge set of benchmarking problems and a tool which compares methods statistically.

- Coordinator: Jan Drchal
- People: Jan Drchal, Pavel Kordík, Oleg Kovářík

### Publications

- Kordík P.: GAME - Hybrid Self-Organizing Modeling System based on GMDH. Springer-Verlag, Berlin, Heidelberg, Czech Technical University in Prague, FEE, Dep. of Comp. Sci. and Computers, 2009 BibTex, PDF
In this chapter, an algorithm to construct hybrid self-organizing neural network is proposed. It combines niching evolutionary strategies, nature inspired and gradient based optimization algorithms (Quasi-Newton, Conjugate Gradient, GA, PSO, ACO, etc.) to evolve neural network with optimal topology adapted to a data set. The GAME algorithm is something in between the GMDH algorithm and the NEAT algorithm. It is capable to handle irrelevant inputs, short and noisy data samples, but also complex data such as "two intertwined spirals" problem. The self-organization of the topology allows it to produce accurate models for various tasks (classification, prediction, regression, etc.). Bencharking with machine learning algorithms implemented in the Weka software showed that the accuracy of GAME models was superior for both regression and classification problems. The most successful configuration of the GAME algorithm is not changing with problem character, natural evolution selects all important parameters of the algorithm. This is a significant step towards the automated data mining.