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Multi-objective reinforcement learning (MORL) is increasingly relevant due to its resemblance to real-world scenarios requiring trade-offs between multiple objectives. Catering to diverse user preferences, traditional reinforcement learning…

Machine Learning · Computer Science 2024-04-08 Junlin Lu , Patrick Mannion , Karl Mason

Multi-Objective Reinforcement Learning (MORL) presents significant challenges and opportunities for optimizing multiple objectives in Large Language Models (LLMs). We introduce a MORL taxonomy and examine the advantages and limitations of…

Computation and Language · Computer Science 2025-09-29 Lingxiao Kong , Cong Yang , Oya Deniz Beyan , Zeyd Boukhers

This paper investigates multi-objective reinforcement learning (MORL), which focuses on learning Pareto optimal policies in the presence of multiple reward functions. Despite MORL's significant empirical success, there is still a lack of…

Machine Learning · Computer Science 2024-07-25 Shuang Qiu , Dake Zhang , Rui Yang , Boxiang Lyu , Tong Zhang

This study introduces a novel multi-objective reinforcement learning (MORL) approach for autonomous intersection management, aiming to balance traffic efficiency and environmental sustainability across electric and internal combustion…

Systems and Control · Electrical Eng. & Systems 2025-12-15 Matteo Cederle , Marco Fabris , Gian Antonio Susto

We develop a novel multi-objective reinforcement learning (MORL) framework to jointly optimize wireless network selection and autonomous driving policies in a multi-band vehicular network operating on conventional sub-6GHz spectrum and…

Machine Learning · Computer Science 2025-06-17 Zijiang Yan , Hina Tabassum

Microgrids with energy storage systems and distributed renewable energy sources play a crucial role in reducing the consumption from traditional power sources and the emission of $CO_2$. Connecting multi microgrid to a distribution power…

Neural and Evolutionary Computing · Computer Science 2021-03-12 Jiangjiao Xu , Ke Li , Mohammad Abusara

Multi-Objective Reinforcement Learning (MORL) is a generalization of traditional Reinforcement Learning (RL) that aims to optimize multiple, often conflicting objectives simultaneously rather than focusing on a single reward. This approach…

Machine Learning · Computer Science 2025-08-15 Davide Guidobene , Lorenzo Benedetti , Diego Arapovic

Sequential decision making in the real world often requires finding a good balance of conflicting objectives. In general, there exist a plethora of Pareto-optimal policies that embody different patterns of compromises between objectives,…

Machine Learning · Computer Science 2024-10-08 Takuya Kanazawa , Chetan Gupta

Multi-objective reinforcement learning (MORL) plays a pivotal role in addressing multi-criteria decision-making problems in the real world. The multi-policy (MP) based methods are widely used to obtain high-quality Pareto front…

Machine Learning · Computer Science 2025-08-05 Zeyu Zhao , Yueling Che , Kaichen Liu , Jian Li , Junmei Yao

Deep reinforcement learning (RL) has been applied extensively to solve complex decision-making problems. In many real-world scenarios, tasks often have several conflicting objectives and may require multiple agents to cooperate, which are…

Artificial Intelligence · Computer Science 2026-03-03 Tianmeng Hu , Biao Luo , Chunhua Yang , Tingwen Huang

Multi-objective reinforcement learning (MORL) is effective for multi-echelon combinatorial supply chain optimisation, where tasks involve high dimensionality, uncertainty, and competing objectives. However, its deployment in dynamic…

Machine Learning · Computer Science 2026-03-09 Rifny Rachman , Josh Tingey , Richard Allmendinger , Wei Pan , Pradyumn Shukla , Bahrul Ilmi Nasution

Reinforcement learning with multiple, potentially conflicting objectives is pervasive in real-world applications, while this problem remains theoretically under-explored. This paper tackles the multi-objective reinforcement learning (MORL)…

Machine Learning · Computer Science 2024-05-10 Tianchen Zhou , FNU Hairi , Haibo Yang , Jia Liu , Tian Tong , Fan Yang , Michinari Momma , Yan Gao

Multi-Objective Reinforcement Learning (MORL) aims to learn a set of policies that optimize trade-offs between multiple, often conflicting objectives. MORL is computationally more complex than single-objective RL, particularly as the number…

Machine Learning · Computer Science 2026-03-27 Dimitris Michailidis , Willem Röpke , Diederik M. Roijers , Sennay Ghebreab , Fernando P. Santos

Reinforcement learning (RL) has emerged as a powerful approach for tackling complex problems. The recent introduction of multi-objective reinforcement learning (MORL) has further expanded the scope of RL by enabling agents to make…

Machine Learning · Computer Science 2023-10-26 Florian Felten , Daniel Gareev , El-Ghazali Talbi , Grégoire Danoy

Multi-objective reinforcement learning (MORL) is a relatively new field which builds on conventional Reinforcement Learning (RL) to solve multi-objective problems. One of common algorithm is to extend scalar value Q-learning by using vector…

Machine Learning · Computer Science 2022-11-17 Kewen Ding

We introduce a new algorithm for multi-objective reinforcement learning (MORL) with linear preferences, with the goal of enabling few-shot adaptation to new tasks. In MORL, the aim is to learn policies over multiple competing objectives…

Machine Learning · Computer Science 2019-11-07 Runzhe Yang , Xingyuan Sun , Karthik Narasimhan

The goal of multi-objective reinforcement learning (MORL) is to learn policies that simultaneously optimize multiple competing objectives. In practice, an agent's preferences over the objectives may not be known apriori, and hence, we…

Machine Learning · Computer Science 2023-05-02 Baiting Zhu , Meihua Dang , Aditya Grover

Many real-world problems (e.g., resource management, autonomous driving, drug discovery) require optimizing multiple, conflicting objectives. Multi-objective reinforcement learning (MORL) extends classic reinforcement learning to handle…

Machine Learning · Computer Science 2025-11-24 Zuzanna Osika , Roxana Rădulescu , Jazmin Zatarain Salazar , Frans Oliehoek , Pradeep K. Murukannaiah

Recently, a deep reinforcement learning method is proposed to solve multiobjective optimization problem. In this method, the multiobjective optimization problem is decomposed to a number of single-objective optimization subproblems and all…

Neural and Evolutionary Computing · Computer Science 2020-02-14 Hong Wu , Jiahai Wang , Zizhen Zhang

Scalarisation functions are widely employed in MORL algorithms to enable intelligent decision-making. However, these functions often struggle to approximate the Pareto front accurately, rendering them unideal in complex, uncertain…

Machine Learning · Computer Science 2025-11-21 Muhammad Sa'ood Shah , Asad Jeewa