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Database Management Systems (DBMS) are crucial for efficient data management and access control, but their administration remains challenging for Database Administrators (DBAs). Tuning, in particular, is known to be difficult. Modern…

Databases · Computer Science 2026-03-17 Yifan Wang , Debabrota Basu , Pierre Bourhis , Romain Rouvoy , Patrick Royer

This article addresses the pump-scheduling optimization problem to enhance real-time control of real-world water distribution networks (WDNs). Our primary objectives are to adhere to physical operational constraints while reducing energy…

Artificial Intelligence · Computer Science 2023-10-17 Harsh Patel , Yuan Zhou , Alexander P Lamb , Shu Wang , Jieliang Luo

Stream workflow application such as online anomaly detection or online traffic monitoring, integrates multiple streaming big data applications into data analysis pipeline. This application can be highly dynamic in nature, where the data…

Distributed, Parallel, and Cluster Computing · Computer Science 2019-12-19 Mutaz Barika , Saurabh Garg , Rajiv Ranjan

Large Language Models (LLMs) increasingly rely on Chain-of-Thought (CoT) reasoning to improve accuracy on complex tasks. However, always generating lengthy reasoning traces is inefficient, leading to excessive token usage and higher…

Indexes can significantly improve search performance in relational databases. However, if the query workload changes frequently or new data updates occur continuously, it may not be worthwhile to build a conventional index upfront for query…

Databases · Computer Science 2025-08-06 Suvam Kumar Das , Suprio Ray

Scanning and filtering over multi-dimensional tables are key operations in modern analytical database engines. To optimize the performance of these operations, databases often create clustered indexes over a single dimension or…

Databases · Computer Science 2020-06-25 Vikram Nathan , Jialin Ding , Mohammad Alizadeh , Tim Kraska

Direct Preference Optimization (DPO) has emerged as an effective approach for aligning large language models (LLMs) with human preferences. However, its performance is highly dependent on the quality of the underlying human preference data.…

Machine Learning · Computer Science 2026-03-10 Zixuan Huang , Yikun Ban , Lean Fu , Xiaojie Li , Zhongxiang Dai , Jianxin Li , Deqing Wang

Aligning the output of Large Language Models (LLMs) with human preferences (e.g., by means of reinforcement learning with human feedback, or RLHF) is essential for ensuring their effectiveness in real-world scenarios. Despite significant…

Artificial Intelligence · Computer Science 2024-10-23 Pietro Bernardelle , Gianluca Demartini

Query rewrite, which aims to generate more efficient queries by altering a SQL query's structure without changing the query result, has been an important research problem. In order to maintain equivalence between the rewritten query and the…

Databases · Computer Science 2024-04-22 Zhaodonghui Li , Haitao Yuan , Huiming Wang , Gao Cong , Lidong Bing

Neural retrieval models excel in Web search, but their training requires substantial amounts of labeled query-document pairs, which are costly to obtain. With the widespread availability of Web document collections like ClueWeb22, synthetic…

Information Retrieval · Computer Science 2025-05-27 João Coelho , Bruno Martins , João Magalhães , Chenyan Xiong

Ocean exploration utilizing autonomous underwater vehicles (AUVs) via reinforcement learning (RL) has emerged as a significant research focus. However, underwater tasks have mostly failed due to the observation delay caused by information…

Systems and Control · Electrical Eng. & Systems 2026-05-19 Jingzehua Xu , Yimian Ding , Yiyuan Yang , Guanwen Xie , Shuai Zhang

Query rewriting, the process of transforming queries into semantically equivalent yet more efficient variants, is crucial for database optimization. Existing solutions predominantly rely on either rule-based heuristics or Large Language…

Databases · Computer Science 2026-04-09 Jiahui Li , Tongwang Wu , Yuren Mao , Rong Kang , Tieying Zhang , Yunjun Gao

Large language model (LLM) serving is becoming an increasingly critical workload for cloud providers. Existing LLM serving systems focus on interactive requests, such as chatbots and coding assistants, with tight latency SLO requirements.…

Distributed, Parallel, and Cluster Computing · Computer Science 2025-02-26 Archit Patke , Dhemath Reddy , Saurabh Jha , Haoran Qiu , Christian Pinto , Chandra Narayanaswami , Zbigniew Kalbarczyk , Ravishankar Iyer

We propose a novel model for learned query optimization which provides query hints leading to better execution plans. The model addresses the three key challenges in learned hint-based query optimization: reliable hint recommendation…

Databases · Computer Science 2024-12-06 Sergey Zinchenko , Sergey Iazov

Deep Learning (DL) has advanced various fields by extracting complex patterns from large datasets. However, the computational demands of DL models pose environmental and resource challenges. Deep shift neural networks (DSNNs) offer a…

Machine Learning · Computer Science 2024-04-05 Leona Hennig , Tanja Tornede , Marius Lindauer

Query optimization is essential for efficient SQL query execution in DBMS, and remains attractive over time due to the growth of data volumes and advances in hardware. Existing traditional optimizers struggle with the cumbersome hand-tuning…

Databases · Computer Science 2025-07-08 Suchen Liu , Jun Gao , Yinjun Han , Yang Lin

Direct Preference Optimization (DPO) has emerged as a cornerstone of reinforcement learning from human feedback (RLHF) due to its simplicity and efficiency. However, existing DPO-based methods typically treat all preference pairs equally,…

Machine Learning · Computer Science 2026-05-26 Shangpin Peng , Weinong Wang , Zhuotao Tian , Senqiao Yang , Xing Wu , Haotian Xu , Chengquan Zhang , Takashi Isobe , Baotian Hu , Min Zhang

Accurate time-series predictions in machine learning are heavily influenced by the selection of appropriate input time length and sampling rate. This paper introduces ATLO-ML, an adaptive time-length optimization system that automatically…

Machine Learning · Computer Science 2025-10-09 I-Hsi Kao , Kanji Uchino

Global leaders and policymakers are unified in their unequivocal commitment to decarbonization efforts in support of Net-Zero agreements. District Heating Systems (DHS), while contributing to carbon emissions due to the continued reliance…

Machine Learning · Computer Science 2025-02-13 Adithya Ramachandran , Thorkil Flensmark B. Neergaard , Andreas Maier , Siming Bayer

Offline preference optimization methods are efficient for large language models (LLMs) alignment. Direct Preference optimization (DPO)-like learning, one of the most popular approaches, stands out for its efficiency in reward modeling.…

Machine Learning · Computer Science 2026-05-26 Xiaobo Wang , Zixia Jia , Jiaqi Li , Qi Liu , Zilong Zheng