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Multi-objective reinforcement learning (MORL) addresses the challenge of simultaneously optimizing multiple, often conflicting, rewards, moving beyond the single-reward focus of conventional reinforcement learning (RL). This approach is…

Neural and Evolutionary Computing · Computer Science 2025-05-21 Carlos Hernández , Roberto Santana

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

Humanoid locomotion is a challenging task due to its inherent complexity and high-dimensional dynamics, as well as the need to adapt to diverse and unpredictable environments. In this work, we introduce a novel learning framework for…

Robotics · Computer Science 2025-10-16 Hyunyoung Jung , Zhaoyuan Gu , Ye Zhao , Hae-Won Park , Sehoon Ha

Reinforcement learning (RL) has demonstrated impressive performance in legged locomotion over various challenging environments. However, due to the sim-to-real gap and lack of explainability, unconstrained RL policies deployed in the real…

Robotics · Computer Science 2025-06-06 Haoyu Wang , Ruyi Zhou , Liang Ding , Tie Liu , Zhelin Zhang , Peng Xu , Haibo Gao , Zongquan Deng

Inferring reward functions from demonstrations and pairwise preferences are auspicious approaches for aligning Reinforcement Learning (RL) agents with human intentions. However, state-of-the art methods typically focus on learning a single…

Machine Learning · Computer Science 2022-01-04 Markus Peschl , Arkady Zgonnikov , Frans A. Oliehoek , Luciano C. Siebert

Developing robust vision-guided controllers for quadrupedal robots in complex environments, with various obstacles, dynamical surroundings and uneven terrains, is very challenging. While Reinforcement Learning (RL) provides a promising…

Multi-objective decision-making problems have emerged in numerous real-world scenarios, such as video games, navigation and robotics. Considering the clear advantages of Reinforcement Learning (RL) in optimizing decision-making processes,…

Machine Learning · Computer Science 2025-01-15 Erlong Liu , Yu-Chang Wu , Xiaobin Huang , Chengrui Gao , Ren-Jian Wang , Ke Xue , Chao Qian

Reinforcement Learning (RL) has demonstrated its ability to solve complex decision-making problems in a variety of domains, by optimizing reward signals obtained through interaction with an environment. However, many real-world scenarios…

Machine Learning · Computer Science 2026-03-24 Dilina Rajapakse , Juan C. Rosero , Ivana Dusparic

Quadrupedal locomotion is a complex, open-ended problem vital to expanding autonomous vehicle reach. Traditional reinforcement learning approaches often fall short due to training instability and sample inefficiency. We propose a novel…

Robotics · Computer Science 2024-11-14 Martin Robert , Simon Brodeur , Francois Ferland

Deep Reinforcement Learning (RL) has emerged as a promising method to develop humanoid robot locomotion controllers. Despite the robust and stable locomotion demonstrated by previous RL controllers, their behavior often lacks the natural…

Robotics · Computer Science 2025-02-06 Qiyuan Zhang , Chenfan Weng , Guanwu Li , Fulai He , Yusheng Cai

Reinforcement learning (RL) faces challenges in evaluating policy trajectories within intricate game tasks due to the difficulty in designing comprehensive and precise reward functions. This inherent difficulty curtails the broader…

Artificial Intelligence · Computer Science 2024-07-02 Zichao Shen , Tianchen Zhu , Qingyun Sun , Shiqi Gao , Jianxin Li

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

Humanoid locomotion is a key skill to bring humanoids out of the lab and into the real-world. Many motion generation methods for locomotion have been proposed including reinforcement learning (RL). RL locomotion policies offer great…

Robotics · Computer Science 2024-07-09 William Thibault , William Melek , Katja Mombaur

We introduce MotionRL, the first approach to utilize Multi-Reward Reinforcement Learning (RL) for optimizing text-to-motion generation tasks and aligning them with human preferences. Previous works focused on improving numerical performance…

Computer Vision and Pattern Recognition · Computer Science 2024-10-10 Xiaoyang Liu , Yunyao Mao , Wengang Zhou , Houqiang Li

Humanoid robots have the potential to mimic human motions with high visual fidelity, yet translating these motions into practical, physical execution remains a significant challenge. Existing techniques in the graphics community often…

Robotics · Computer Science 2025-02-18 Yashuai Yan , Esteve Valls Mascaro , Tobias Egle , Dongheui Lee

Achieving highly dynamic behaviors on humanoid robots, such as running, requires controllers that are both robust and precise, and hence difficult to design. Classical control methods offer valuable insight into how such systems can…

Robotics · Computer Science 2025-09-25 Zachary Olkin , Kejun Li , William D. Compton , Aaron D. Ames

We present a unified model-based and data-driven approach for quadrupedal planning and control to achieve dynamic locomotion over uneven terrain. We utilize on-board proprioceptive and exteroceptive feedback to map sensory information and…

Robotics · Computer Science 2022-05-13 Siddhant Gangapurwala , Mathieu Geisert , Romeo Orsolino , Maurice Fallon , Ioannis Havoutis

Multi-objective reinforcement learning (MORL) aims at optimising several, often conflicting goals to improve the flexibility and reliability of RL in practical tasks. This is typically achieved by finding a set of diverse, non-dominated…

Artificial Intelligence · Computer Science 2026-02-06 Qiyue Xia , Tianwei Wang , J. Michael Herrmann

Humanoid robots are expected to operate in human-centered environments where safe and natural physical interaction is essential. However, most recent reinforcement learning (RL) policies emphasize rigid tracking and suppress external…

Robotics · Computer Science 2025-11-07 Qingzhou Lu , Yao Feng , Baiyu Shi , Michael Piseno , Zhenan Bao , C. Karen Liu

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