1. Beyond Winning Strategies: Admissible and Admissible Winning Strategies for Quantitative Reachability Games
- Author
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Muvvala, Karan, Ho, Qi Heng, and Lahijanian, Morteza
- Subjects
Computer Science - Computer Science and Game Theory ,Computer Science - Formal Languages and Automata Theory ,Computer Science - Logic in Computer Science ,Computer Science - Robotics ,D.2.4 ,I.2.4 ,I.2.9 - Abstract
Classical reactive synthesis approaches aim to synthesize a reactive system that always satisfies a given specifications. These approaches often reduce to playing a two-player zero-sum game where the goal is to synthesize a winning strategy. However, in many pragmatic domains, such as robotics, a winning strategy does not always exist, yet it is desirable for the system to make an effort to satisfy its requirements instead of "giving up". To this end, this paper investigates the notion of admissible strategies, which formalize "doing-your-best", in quantitative reachability games. We show that, unlike the qualitative case, quantitative admissible strategies are history-dependent even for finite payoff functions, making synthesis a challenging task. In addition, we prove that admissible strategies always exist but may produce undesirable optimistic behaviors. To mitigate this, we propose admissible winning strategies, which enforce the best possible outcome while being admissible. We show that both strategies always exist but are not memoryless. We provide necessary and sufficient conditions for the existence of both strategies and propose synthesis algorithms. Finally, we illustrate the strategies on gridworld and robot manipulator domains., Comment: TL;DR: This paper relaxes the notion of winning strategies by introducing Admissible and Admissible Winning strategies for quantitative reachability games, providing existence proofs and synthesis algorithms with applications in robotics
- Published
- 2024