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Integral Temporal Difference Learning for Continuous-Time Linear Quadratic Regulations

Tae Yoon Chun, Jae Young Lee, Jin Bae Park, and Yoon Ho Choi*
International Journal of Control, Automation, and Systems, vol. 15, no. 1, pp.226-238, 2017

Abstract : "In this paper, we propose a temporal difference (TD) learning method, called integral TD learning that efficiently finds solutions to continuous-time (CT) linear quadratic regulation (LQR) problems in an online fashion where system matrix A is unknown. The idea originates from a computational reinforcement learning method known as TD(0), which is the simplest TD method in a finite Markov decision process. For the proposed integral TD method, we mathematically analyze the positive definiteness of the updated value functions, monotone convergence conditions, and stability properties concerning the locations of the closed-loop poles in terms of the learning rate and the discount factor. The proposed method includes the existing value iteration method for CT LQR problems as a special case. Finally, numerical simulations are carried out to verify the effectiveness of the proposed method and further investigate the aforementioned mathematical properties."

Keyword : "Adaptive optimal control, linear quadratic regulation, reinforcement learning, temporal difference, value iteration."

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