Hybrid IR

IR: Information Retrieval

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Overview

Hybrid information retrieval studies how to combine complementary signals, especially exact-term sparse search such as BM25 and semantic dense-vector search, to find evidence that either method might miss alone. Systems may also connect search with knowledge graphs, relational databases, and source-native query engines, using rank fusion, reranking, or query routing before retrieval-augmented generation. These approaches support question answering, technical support, and search across sources where wording varies or evidence is split between documents and structured data. Fusion often improves recall and ranking, but results vary by domain; adaptive routing, fair evaluation, cross-domain transfer, and reliable evidence grounding remain open challenges.

Latest papers

CardsList

18 papers1 paper in the last four weeks, against 2 the four weeks before. 0.0% of all new papers.

  1. CultureBot: A Framework for Retrieval-Augmented Exploration of Cultural Heritage Data

    Oct 12, 2026Vasileios Karampinis, Angelos Vlachos, Giorgos Filandrianos +4Digital Cultural HeritageCultural Heritage

    School of Electrical and Computer Engineering, AILS Laboratory National Technical University of Athens

  2. Efficiently Linking Unstructured Data for Multi-step Reasoning

    Sep 16, 2026Jiaming Liang, Haydn Jones, Jacob R. Gardner +2Hybrid IRMulti-Vector Retrieval

    University of Pennsylvania Philadelphia, PA, USA

  3. Benchmarking Hybrid Deep Research Across Database Querying and Web Search

    Sep 8, 2026Ruofan Wu, Peiran Xu, Xiaolong Li +9Deep Research AgentsAgentic Search

    University of Houston · University of California, Los Angeles · The University of Hong Kong +2

  4. Guardian Crawler: Retrieval-First Knowledge Discovery with Bounded LLM Augmentation for Noisy Web Intelligence

    Aug 10, 2026Joshua Castillo, Santosh Nukavarapu, Ravi MukkamalaHybrid IRInformation Retrieval

    Department of Computer Science Old Dominion University

  5. Do Static Embeddings Add Value to Hybrid Dutch Retrieval?

    Aug 3, 2026António Pereira BarataText EmbeddingsWord Embeddings

  6. Evidence-Unit Fairness and the Limits of Query-Adaptive Sparse-Dense Fusion in Financial Document Retrieval

    Jul 31, 2026Chenyu Wu, You LinHybrid IRInformation Retrieval

    Duke University Durham, NC, USA · Independent Researcher New York, NY, USA

  7. RAGAL: A Frugal, Fully Local Retrieval-Augmented Assistant for Technical Support at a Government Agency

    Jul 21, 2026Dan MusetoiuRetrieval-Augmented GenerationFine-Tuning

    IT Department, Agency for Financing Rural Investments (AFIR), Romania

  8. Healthier LLMs: Retrieval-Augmented Generation for Public Health Question Answering

    Jul 7, 2026Felix Feldman, Joshua Harris, Timothy Laurence +7Retrieval-Augmented GenerationQuestion Answering

  9. OmniRetrieval: Unified Retrieval across Heterogeneous Knowledge Sources

    May 28, 2026Jinheon Baek, Soyeong Jeong, Sangwoo Park +5Hybrid IRInformation Retrieval

    KAIST

  10. CyBOKClaw: Human-in-the-Loop CyBOK Mapping for Cybersecurity Curriculum

    May 23, 2026Yan Lin Aung, Kevin TogbeCybersecurityHybrid IR

    University of Derby, Derby, UK

  11. Knowledge Affordances for Hybrid Human-AI Information Seeking

    Apr 30, 2026Irene CelinoHuman-AI InteractionHybrid IR

    Cefriel – viale Sarca 226, 20126 Milano, Italy

  12. FRAGATA: Semantic Retrieval of HPC Support Tickets via Hybrid RAG over 20 Years of Request Tracker History

    Apr 15, 2026Santiago Paramés-Estévez, Nicolás Filloy-Montesino, Jorge Fernández-Fabeiro +1Semantic SearchHybrid IR

    Galicia Supercomputing Center (CESGA), Santiago de Compostela · Universidade de Vigo

  13. Cognis: Context-Aware Memory for Conversational AI Agents

    Mar 27, 2026Parshva Daftari, Khush Patel, Shreyas Kapale +2Agent Memory ManagementMemory-Augmented Language Model Agents

    Lyzr Research

  14. LLM-Enhanced Semantic Data Integration of Electronic Component Qualifications in the Aerospace Domain

    Mar 20, 2026Antonio De Santis, Marco Balduini, Matteo Belcao +3Hybrid IR

    Politecnico di Milano, DEIB, I-20133 Milano, Italy · Quantia Consulting, Milano, Italy · Motus ml, Milano, Italy +1

  15. MemX: A Local-First Long-Term Memory System for AI Assistants

    Mar 17, 2026Lizheng SunPersistent Memory for Language ModelsLong-Term Conversational Memory

  16. JobMatchAI-An Intelligent Job Matching Platform Using Knowledge Graphs, Semantic Search and Explainable AI

    Mar 15, 2026Mayank Vyas, Abhijit Chakraborty, Vivek GuptaJob-Candidate MatchingHybrid IR

    Arizona State University

  17. Agentic DAG-Orchestrated Planner Framework for Multi-Modal, Multi-Hop Question Answering in Hybrid Data Lakes

    Mar 15, 2026Kirushikesh D B, Manish Kesarwani, Nishtha Madaan +6Multi-Hop QAMultimodal QA

    IBM Research, India · IBM Software, India

  18. Horizon Scans can be accelerated using novel information retrieval and artificial intelligence tools

    Apr 2, 2025Lena Schmidt, Oshin Sharma, Chris Marshall +1HealthcareLLM Reranking

    NIHR Innovation Observatory, Population Health Sciences Institute, Newcastle University, Newcastle upon Tyne, UK