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Policy gradient reinforcement learning (RL) algorithms have achieved impressive performance in challenging learning tasks such as continuous control, but suffer from high sample complexity. Experience replay is a commonly used approach to…

Machine Learning · Statistics 2020-02-19 Saad Mohamad , Giovanni Montana

The advancement of artificial intelligence toward agentic science is currently bottlenecked by the challenge of ultra-long-horizon autonomy, the ability to sustain strategic coherence and iterative correction over experimental cycles…

Artificial Intelligence · Computer Science 2026-03-26 Xinyu Zhu , Yuzhu Cai , Zexi Liu , Bingyang Zheng , Cheng Wang , Rui Ye , Yuzhi Zhang , Linfeng Zhang , Weinan E , Siheng Chen , Yanfeng Wang

Reinforcement learning (RL) in continuous action spaces encounters persistent challenges, such as inefficient exploration and convergence to suboptimal solutions. To address these limitations, we propose CAMEL, a novel framework integrating…

Machine Learning · Computer Science 2025-02-18 Yanxiao Zhao , Yangge Qian , Jingyang Shan , Xiaolin Qin

Preference optimization is crucial for aligning large language models (LLMs) with human values and intentions. A significant challenge in this process is the distribution mismatch between pre-collected offline preference data and the…

Computation and Language · Computer Science 2026-03-02 Junming Yang , Ning Xu , Biao Liu , Shiqi Qiao , Xin Geng

Exploration remains the key bottleneck for large language model agents trained with reinforcement learning. While prior methods exploit pretrained knowledge, they fail in environments requiring the discovery of novel states. We propose…

Machine Learning · Computer Science 2026-03-09 Zeyuan Liu , Jeonghye Kim , Xufang Luo , Dongsheng Li , Yuqing Yang

Multi-access edge computing (MEC) aims to extend cloud service to the network edge to reduce network traffic and service latency. A fundamental problem in MEC is how to efficiently offload heterogeneous tasks of mobile applications from…

Distributed, Parallel, and Cluster Computing · Computer Science 2020-10-27 Jin Wang , Jia Hu , Geyong Min , Albert Y. Zomaya , Nektarios Georgalas

Large Language Models (LLMs) have shown remarkable capabilities as AI agents. However, existing methods for enhancing LLM-agent abilities often lack a focus on data quality, leading to inefficiencies and suboptimal results in both…

Machine Learning · Computer Science 2025-02-19 Yunxiao Zhang , Guanming Xiong , Haochen Li , Wen Zhao

Reinforcement learning (RL) has become a central component of post-training for large language models (LLMs), particularly for complex reasoning tasks that require stable optimization over long generation horizons. However, achieving…

Machine Learning · Computer Science 2026-02-17 Yuepeng Sheng , Yuwei Huang , Shuman Liu , Anxiang Zeng , Haibo Zhang

Many advances that have improved the robustness and efficiency of deep reinforcement learning (RL) algorithms can, in one way or another, be understood as introducing additional objectives or constraints in the policy optimization step.…

This paper discusses an Enhanced Model-Agnostic Meta-Learning (E-MAML) algorithm that generates fast convergence of the policy function from a small number of training examples when applied to new learning tasks. Built on top of…

Machine Learning · Computer Science 2020-12-14 Ibrahim Ahmed , Marcos Quinones-Grueiro , Gautam Biswas

As autonomous agents become adept at understanding and interacting with graphical user interface (GUI) environments, a new era of automated task execution is emerging. Recent studies have demonstrated that Reinforcement Learning (RL) can…

Artificial Intelligence · Computer Science 2026-03-16 Songqin Nong , Xiaoxuan Tang , Jingxuan Xu , Sheng Zhou , Jianfeng Chen , Tao Jiang , Wenhao Xu

Retrieval-augmented generation (RAG) systems face a fundamental challenge in aligning independently developed retrievers and large language models (LLMs). Existing approaches typically involve modifying either component or introducing…

Computation and Language · Computer Science 2025-05-23 Guoxin Chen , Minpeng Liao , Peiying Yu , Dingmin Wang , Zile Qiao , Chao Yang , Xin Zhao , Kai Fan

Visual-Language-Action (VLA) models have demonstrated strong cross-scenario generalization capabilities in various robotic tasks through large-scale pre-training and task-specific fine-tuning. However, their training paradigm mainly relies…

Robotics · Computer Science 2025-09-30 Zengjue Chen , Runliang Niu , He Kong , Qi Wang , Qianli Xing , Zipei Fan

Reinforcement learning (RL) has become a powerful paradigm for optimizing large language models (LLMs) to handle complex reasoning tasks. A core challenge in this process lies in managing policy entropy, which reflects the balance between…

Machine Learning · Computer Science 2026-04-24 Zhenpeng Su , Leiyu Pan , Minxuan Lv , Yuntao Li , Wenping Hu , Fuzheng Zhang , Kun Gai , Guorui Zhou

Designing and analyzing model-based RL (MBRL) algorithms with guaranteed monotonic improvement has been challenging, mainly due to the interdependence between policy optimization and model learning. Existing discrepancy bounds generally…

Machine Learning · Computer Science 2023-11-09 Tianying Ji , Yu Luo , Fuchun Sun , Mingxuan Jing , Fengxiang He , Wenbing Huang

Domain-specific large language models (LLMs), typically developed by fine-tuning a pre-trained general-purpose LLM on specialized datasets, represent a significant advancement in applied AI. A common strategy in LLM fine-tuning is…

Machine Learning · Computer Science 2026-01-08 Jing-Cheng Pang , Liu Sun , Chang Zhou , Xian Tang , Haichuan Ma , Kun Jiang , Jianlong Wang , Kai Zhang , Sijie Wu , Haoran Cai , Chenwei Wu , Xubin Li , Xin Chen

During initial iterations of training in most Reinforcement Learning (RL) algorithms, agents perform a significant number of random exploratory steps. In the real world, this can limit the practicality of these algorithms as it can lead to…

Machine Learning · Computer Science 2022-10-17 Ashish Kumar Jayant , Shalabh Bhatnagar

The "pre-training $\rightarrow$ downstream adaptation" presents both new opportunities and challenges for Continual Learning (CL). Although the recent state-of-the-art in CL is achieved through Parameter-Efficient-Tuning (PET) adaptation…

Computer Vision and Pattern Recognition · Computer Science 2023-08-22 Qiankun Gao , Chen Zhao , Yifan Sun , Teng Xi , Gang Zhang , Bernard Ghanem , Jian Zhang

Reinforcement learning with verifiable rewards (RLVR), particularly Group Relative Policy Optimization (GRPO), has advanced LLM reasoning. However, GRPO suffers from three credit assignment failures: uniform token-level granularity that…

Machine Learning · Computer Science 2026-05-07 Song Yu , Li Li , Wenwen Zhao , Zhisheng Yang

Generative optimization uses large language models (LLMs) to iteratively improve artifacts (such as code, workflows or prompts) using execution feedback. It is a promising approach to building self-improving agents, yet in practice remains…