Abstract
Factored Reinforcement Learning (frl) is a new technique to solve Factored Markov Decision Problems (fmdps) when the structure of the problem is not known in advance. Like Anticipatory Learning Classifier Systems (alcss), it is a model-based Reinforcement Learning approach that includes generalization mechanisms in the presence of a structured domain. In general, frl and alcss are explicit, state-anticipatory approaches that learn generalized state transition models to improve system behavior based on model-based reinforcement learning techniques. In this contribution, we highlight the conceptual similarities and differences between frl and alcss, focusing on the one hand on spiti, an instance of frl method, and on alcss, macs and xacs, on the other hand. Though frl systems seem to benefit from a clearer theoretical grounding, an empirical comparison between spiti and xacs on two benchmark problems reveals that the latter scales much better than the former when some combination of state variables do not occur. Based on this finding, we discuss the mechanisms in xacs that result in the better scalability and propose importing these mechanisms into frl systems.
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Sigaud, O., Butz, M.V., Kozlova, O., Meyer, C. (2009). Anticipatory Learning Classifier Systems and Factored Reinforcement Learning. In: Pezzulo, G., Butz, M.V., Sigaud, O., Baldassarre, G. (eds) Anticipatory Behavior in Adaptive Learning Systems. ABiALS 2008. Lecture Notes in Computer Science(), vol 5499. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-02565-5_18
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DOI: https://doi.org/10.1007/978-3-642-02565-5_18
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