xMLC - A Toolkit for Machine Learning Control
Résumé
xMLC is the second book of this `Machine Learning Tools in Fluid Mechanics' Series and focuses on Machine Learning Control (MLC). The objectives of this book are two-fold: First, provide an introduction to MLC for students, researchers, and newcomers on the field; and second, share an open-source code, xMLC, to automatically learn open- and closed-loop control laws directly in the plant with only a few executable commands. This presented MLC algorithm is based on genetic programming and highlights the learning principles (exploration and exploitation). The need for balance between these two principles is illustrated with an extensive parametric study where the explorative and exploitative forces are gradually integrated into the optimization process. The provided software xMLC is an implementation of MLC. It builds on OpenMLC (Duriez et al., 2017) but replaces tree-based genetic programming but the linear genetic programming framework (Brameier and Banzhaf, 2006). The latter representation is preferred for its easier implementation of multiple-input multiple-output control laws and of the genetic operators (mutation and crossover). The handling of the software is facilitated by a step-by-step guide that shall help new practitioners use the code within a few minutes. We also provide detailed advice on using the code for other solvers and for experiments. The code is open-source and a GitHub version is available for future updates, options, and add-ons.
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