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Li, Dazi; Wang, Yuting; Song, Tianheng; Jin, Qibing
IEEE access, 01/2018, Volume: 6Journal Article
Reinforcement learning (RL) is an important machine learning paradigm that can be used for learning from the data obtained by the human-computer interface and the interaction in human-centered smart systems. One of the essential problems in RL algorithms is the value functions. Value functions are usually estimated via linearly parameterized value functions. Prior RL algorithms that generalize in this way required learning times tuning the linear weights leaving out the basis function. In fact, basis functions in value function approximation also have a significant influence on the performance. In this paper, a new adaptive policy evaluation network based on recursive least squares temporal difference (TD) with gradient correction (adaptive RC network) is proposed. Basis functions in the proposed algorithm were adaptive optimized, mainly aiming at the widths. In the proposed algorithm, TD error and value function were estimated by RC algorithm and value function approximation. The gradient derived from the squares of TD error was used to update the widths of basis functions. Therefore, the RC network can adjust its network parameters in an adaptive way with a self-organizing approach according to the progress in learning. Empirical results based on the three RL benchmarks show the performance and applicability of the proposed adaptive RC network.
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