Machine learning control Machine learning control is a subfield of machine learning , intelligent control and control theory which solves optimal control problems with methods of machine learning. Key applications are complex nonlinear systems for which linear control theory methods are not applicable .Types of problems and tasks Four types of problems are commonly encountered . Control parameter identification: MLC translates to a parameter identification if the structure of the control law is given but the parameters are unknown. One example is the genetic algorithm for optimizing coefficients of a PID controller or discrete-time optimal control. Control design as regression problem of the first kind: MLC approximates a general nonlinear mapping from sensor signals to actuation commands, if the sensor signals and the optimal actuation command are known for every state. One example is the computation of sensor feedback from a known full state feedback . A neural network is commonly used technique for this task. Control design as regression problem of the second kind: MLC may also identify arbitrary nonlinear control laws which minimize the cost function of the plant. In this case, neither a model, nor the control law structure, nor the optimizing actuation command needs to be known. The optimization is only based on the control performance as measured in the plant. Genetic programming is a powerful regression technique for this purpose. Reinforcement learning control: The control law may be continually updated over measured performance changes using reinforcement learning . MLC comprises, for instance, neural network control, genetic algorithm based control, genetic programming control, reinforcement learning control, and has methodological overlaps with other data-driven control, like artificial intelligence and robot control .Applications MLC has been successfully applied to many nonlinear control problems, exploring unknown and often unexpected actuation mechanisms. Example applications include As for all general nonlinear methods, MLC comes with no guaranteed convergence , optimality or robustness for a range of operating conditions.
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