In this paper, we study the problem of networked multi-agent reinforcement learning (MARL), where a number of agents are deployed as a partially connected network and each interacts only with nearby agents. Networked MARL requires all agents make decision in a decentralized manner to optimize a global objective with restricted communication between neighbors over the network. Inspired by the fact that \textit{sharing} plays a key role in human's learning of cooperation, we propose LToS, a hierarchically decentralized MARL framework that enables agents to learn to dynamically share reward with neighbors so as to encourage agents to cooperate on the global objective. For each agent, the high-level policy learns how to share reward with neighbors to decompose the global objective, while the low-level policy learns to optimize local objective induced by the high-level policies in the neighborhood. The two policies form a bi-level optimization and learn alternately. We empirically demonstrate that LToS outperforms existing methods in both social dilemma and networked MARL scenario.

本文研究了网络多智能体强化学习（MARL）问题，提出了一种分层分散式MarL框架：LToS，它使代理者能够动态地与邻居共享奖励，从而通过集体鼓励代理者在全局目标上进行合作。实证结果表明LToS在社会困境和网络MARL的情景下都优于现有方法。

多智能体强化学习中的合作学习