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Infinite Horizon Average Cost Optimality Criteria for Mean-Field Control

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arXiv:2309.11744v2 Announce Type: replace-cross
Abstract: We study mean-field control problems in discrete-time under the infinite horizon average cost optimality criteria. We focus on both the finite population and the infinite population setups. We show the existence of a solution to the average cost optimality equation (ACOE) and the existence of optimal stationary Markov policies for finite population problems under (i) a minorization condition that provides geometric ergodicity on the collective state process of the agents, and (ii) under standard Lipschitz continuity assumptions on the stage-wise cost and transition function of the agents when the Lipschitz constant of the transition function satisfies a certain bound. For the infinite population problem, we establish the existence of a solution to the ACOE, and the existence of optimal policies under the continuity assumptions on the cost and the transition functions. Finally, we relate the finite population and infinite population control problems: (i) we prove that the optimal value of the finite population problem converges to the optimal value of the infinite population problem as the number of agents grows to infinity; (ii) we show that the accumulation points of the finite population optimal solution corresponds to an optimal solution for the infinite population problem, and finally (iii), we show that one can use the solution of the infinite population problem for the finite population problem symmetrically across the agents to achieve near optimal performance when the population is sufficiently large.

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