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Hierarchical reinforcement learning (HRL) learns to make decisions on multiple levels of temporal abstraction. A key challenge in HRL is that the low-level policy changes over time, making it difficult for the high-level policy to generate…

Machine Learning · Computer Science 2025-05-29 Vivienne Huiling Wang , Tinghuai Wang , Joni Pajarinen

Recent studies show that Large Language Models (LLMs) achieve strong reasoning capabilities through supervised fine-tuning or reinforcement learning. However, a key approach, the Process Reward Model (PRM), suffers from reward hacking,…

Computation and Language · Computer Science 2026-04-10 Teng Wang , Zhangyi Jiang , Zhenqi He , Shenyang Tong , Wenhan Yang , Yanan Zheng , Zeyu Li , Zifan He , Hailei Gong , Zewen Ye , Shengjie Ma , Jianping Zhang

Reinforcement Learning (RL) has proven highly effective at enhancing the complex reasoning abilities of Large Language Models (LLMs), yet underlying mechanisms driving this success remain largely opaque. Our analysis reveals that puzzling…

Artificial Intelligence · Computer Science 2025-09-30 Haozhe Wang , Qixin Xu , Che Liu , Junhong Wu , Fangzhen Lin , Wenhu Chen

Solving robotic navigation tasks via reinforcement learning (RL) is challenging due to their sparse reward and long decision horizon nature. However, in many navigation tasks, high-level (HL) task representations, like a rough floor plan,…

Robotics · Computer Science 2021-11-08 Jan Wöhlke , Felix Schmitt , Herke van Hoof

Hierarchical reinforcement learning (HRL) is a promising approach to extend traditional reinforcement learning (RL) methods to solve more complex tasks. Yet, the majority of current HRL methods require careful task-specific design and…

Machine Learning · Computer Science 2018-10-08 Ofir Nachum , Shixiang Gu , Honglak Lee , Sergey Levine

Hierarchical Reinforcement Learning (HRL) is a promising approach to solving long-horizon problems with sparse and delayed rewards. Many existing HRL algorithms either use pre-trained low-level skills that are unadaptable, or require…

Machine Learning · Computer Science 2019-10-11 Siyuan Li , Rui Wang , Minxue Tang , Chongjie Zhang

Despite of achieving great success in real-world applications, Deep Reinforcement Learning (DRL) is still suffering from three critical issues, i.e., data efficiency, lack of the interpretability and transferability. Recent research shows…

Artificial Intelligence · Computer Science 2023-07-10 Hankz Hankui Zhuo , Shuting Deng , Mu Jin , Zhihao Ma , Kebing Jin , Chen Chen , Chao Yu

In this paper, we propose a navigation algorithm oriented to multi-agent environment. This algorithm is expressed as a hierarchical framework that contains a Hidden Markov Model (HMM) and a Deep Reinforcement Learning (DRL) structure. For…

Robotics · Computer Science 2018-07-18 Wenhao Ding , Shuaijun Li , Huihuan Qian

This paper presents a novel heuristic deep reinforcement learning (HDRL) framework designed to optimize reconfigurable intelligent surface (RIS) phase shifts in secure satellite communication systems utilizing rate splitting multiple access…

Signal Processing · Electrical Eng. & Systems 2025-01-22 Tingnan Bao , Melike Erol-Kantarci

Autonomous vehicles need to handle various traffic conditions and make safe and efficient decisions and maneuvers. However, on the one hand, a single optimization/sampling-based motion planner cannot efficiently generate safe trajectories…

Robotics · Computer Science 2021-06-10 Jinning Li , Liting Sun , Jianyu Chen , Masayoshi Tomizuka , Wei Zhan

In 5G non-standalone mode, an intelligent traffic steering mechanism can vastly aid in ensuring smooth user experience by selecting the best radio access technology (RAT) from a multi-RAT environment for a specific traffic flow. In this…

Networking and Internet Architecture · Computer Science 2023-01-20 Md Arafat Habib , Hao Zhou , Pedro Enrique Iturria-Rivera , Medhat Elsayed , Majid Bavand , Raimundas Gaigalas , Yigit Ozcan , Melike Erol-Kantarci

This work presents a Hierarchical Multi-Agent Reinforcement Learning framework for analyzing simulated air combat scenarios involving heterogeneous agents. The objective is to identify effective Courses of Action that lead to mission…

Artificial Intelligence · Computer Science 2025-05-15 Ardian Selmonaj , Oleg Szehr , Giacomo Del Rio , Alessandro Antonucci , Adrian Schneider , Michael Rüegsegger

Cooperative air-ground delivery has emerged as a promising logistics paradigm by leveraging the complementary strengths of UAVs and ground carriers. However, effective dispatching in such heterogeneous systems faces two critical challenges:…

Computers and Society · Computer Science 2026-02-16 Songxin Lei , Chunming Ma , Haomin Wen , Yexin Li , Lizhenghe Chen , Qianyu Yang , Fugee Tsung , Lei Chen , Sijie Ruan , Yuxuan Liang

Decentralized combinatorial optimization in evolving multi-agent systems poses significant challenges, requiring agents to balance long-term decision-making, short-term optimized collective outcomes, while preserving autonomy of interactive…

Multiagent Systems · Computer Science 2025-09-23 Chuhao Qin , Evangelos Pournaras

Hierarchical reinforcement learning (HRL) enables agents to solve complex, long-horizon tasks by decomposing them into manageable sub-tasks. However, HRL methods face two fundamental challenges: (i) non-stationarity caused by the evolving…

Reinforcement learning-based mapless navigation holds significant potential. However, it faces challenges in indoor environments with local minima area. This paper introduces a safe mapless navigation framework utilizing hierarchical…

Robotics · Computer Science 2025-03-18 Jianqi Gao , Xizheng Pang , Qi Liu , Yanjie Li

Multi-band operation in wireless networks can improve data rates by leveraging the benefits of propagation in different frequency ranges. Distinctive beam management procedures in different bands complicate band assignment because they…

Signal Processing · Electrical Eng. & Systems 2023-08-28 Dohyun Kim , Miguel R. Castellanos , Robert W. Heath

We propose a novel hierarchical reinforcement learning framework for quadruped locomotion over challenging terrain. Our approach incorporates a two-layer hierarchy in which a high-level policy (HLP) selects optimal goals for a low-level…

Robotics · Computer Science 2025-06-26 Jeremiah Coholich , Muhammad Ali Murtaza , Seth Hutchinson , Zsolt Kira

Edge computing faces unprecedented resource orchestration challenges from multi-dimensional heterogeneity across device architectures, diverse task requirements in CPU-intensive, GPU-intensive, I/O-intensive, and dynamic network conditions.…

Distributed, Parallel, and Cluster Computing · Computer Science 2026-05-12 Jianyong Zhu , Hao Chen , Juan Zhang , Fangda Guo , Albert Y. Zomaya , Renyu Yang

This paper develops a hierarchical reinforcement learning architecture for multimission spaceflight campaign design under uncertainty, including vehicle design, infrastructure deployment planning, and space transportation scheduling. This…

Machine Learning · Computer Science 2025-08-27 Yuji Takubo , Hao Chen , Koki Ho