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W3092994383 abstract "In the theory of Partially Observed Markov Decision Processes (POMDPs), existence of optimal policies have in general been established via converting the original partially observed stochastic control problem to a fully observed one on the belief space, leading to a belief-MDP. However, computing an optimal policy for this fully observed model, and so for the original POMDP, using classical dynamic or linear programming methods is challenging even if the original system has finite state and action spaces, since the state space of the fully observed belief-MDP model is always uncountable. Furthermore, there exist very few rigorous approximation results, as regularity conditions needed often require a tedious study involving the spaces of probability measures leading to properties such as Feller continuity. In this paper, we rigorously establish near optimality of finite window control policies in POMDPs under mild non-linear filter stability conditions and the assumption that the measurement and action sets are finite (and the state space is real vector valued). We also establish a rate of convergence result which relates the finite window memory size and the approximation error bound, where the rate of convergence is exponential under explicit and testable geometric filter stability conditions. While there exist many experimental results and few rigorous asymptotic convergence results, an explicit rate of convergence result is new in the literature, to our knowledge." @default.
W3092994383 created "2020-10-22" @default.
W3092994383 creator A5005401257 @default.
W3092994383 creator A5039054529 @default.
W3092994383 date "2020-10-15" @default.
W3092994383 modified "2023-09-24" @default.
W3092994383 title "Near Optimality of Finite Memory Feedback Policies in Partially Observed Markov Decision Processes." @default.
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