arXiv Machine Learning By Hongming Li, Zhao Yang, Xiaoxuan Liang, Shujian Yu, Jose C. Principe

ELEMENT: Episodic and Lifelong Exploration via Maximum Entropy

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The paper introduces ELEMENT, a framework that combines episodic and lifelong entropy maximization to drive reward-free exploration in reinforcement learning. It addresses two key limitations of existing entropy-based methods: the vanishing intrinsic reward after a state is visited and the computational cost of estimating entropy over large datasets. ELEMENT achieves this by deriving an average episodic state entropy reward and employing a k‑NN graph‑based estimator for lifelong entropy, leading to superior state coverage and unsupervised pre‑training performance compared to current baselines.

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arXiv AI
Aug 12

Exploration-Driven Personalized Federated Reinforcement Learning via Intrinsic Motivation

arXiv:2608. 10499v1 Announce Type: cross Abstract: Personalized Federated Reinforcement Learning (PFRL) takes a decentralized approach to storing and accessing information based on past experiences while keeping each client's data private during the learning of each client's policy.

By Md Rafid Islam, Rafsan Jany, Zahid Hasan, Ratun Rahman
arXiv Machine Learning
1d ago

Exploration via Exploitation: The Blessing of Reward Diversity in Personalized Federated RL

The paper introduces two algorithms for personalized federated reinforcement learning: PF-UCBVI, which achieves optimal linear speedup by separating shared dynamics from individual goals, and PF-EFVI, a greedy method that uses reward diversity to guarantee state-action coverage without explicit exploration bonuses. The authors prove that PF-EFVI attains logarithmic regret under sufficient reward diversity, showing that disagreement among agents can shift the exploration burden from temporal to spatial aspects. This demonstrates that heterogeneous rewards can be leveraged as a structural asset to facilitate efficient collective learning.

By Jiin Woo, Gauri Joshi, Yuejie Chi