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NeurIPSArrasy-Rahman
2025
Kale-ab Tessera, Arrasy Rahman, Amos Storkey, Stefano V. Albrecht
HyperMARL: Adaptive Hypernetworks for Multi-Agent RL
Conference on Neural Information Processing Systems, 2025
Abstract | BibTex | arXiv | Code
NeurIPSmulti-agent-rl
Abstract:
Adaptability to specialised or homogeneous behaviours is critical in cooperative multi-agent reinforcement learning (MARL). Parameter sharing (PS) techniques, common for efficient adaptation, often limit behavioural diversity due to cross-agent gradient interference, which we show can be exacerbated by the coupling of observations and agent IDs. Current remedies typically add complexity through altered objectives, manual preset diversity levels, or sequential updates. We ask: can shared policies adapt without these complexities? We propose HyperMARL, a PS approach using hypernetworks for dynamic agent-specific parameters, without altering the RL objective or requiring preset diversity levels. HyperMARL's explicit decoupling of observation- and agent-conditioned gradients empirically reduces policy gradient variance, facilitates shared-policy adaptation (including specialisation), and helps mitigate cross-agent interference. Across diverse MARL benchmarks (up to 20 agents), requiring homogeneous, heterogeneous, or mixed behaviours, HyperMARL achieves competitive performance against key baselines -- fully shared, non-parameter sharing, and three diversity-promoting methods -- while preserving behavioural diversity comparable to non-parameter sharing. These findings establish HyperMARL as a versatile approach for adaptive MARL.
@inproceedings{tessera2025hypermarl,
title={{HyperMARL}: Adaptive Hypernetworks for Multi-Agent RL},
author={Kale-ab Tessera and Arrasy Rahman and Amos Storkey and Stefano V. Albrecht},
booktitle={Conference on Neural Information Processing Systems},
year={2025}
}