Intelligent Retrieval and Information Systems (IRIS) Group

Transforming how humans and machines discover, interpret, and interact with knowledge in the digital age.

The IRIS Lab is dedicated to advancing the frontier of intelligent information systems research. We explore the fascinating challenge of teaching machines to move beyond simple data retrieval toward genuine understanding, reasoning, and natural interaction with knowledge repositories.

Our work sits at the convergence of Information Retrieval (IR), Natural Language Processing (NLP), and Large Language Models (LLMs), creating systems that evolve alongside users’ increasingly sophisticated information needs. Rather than treating search as a static process, we envision it as an adaptive dialogue between humans and machines.

At the IRIS Lab, we blend the foundations of traditional IR with cutting-edge neural architectures to develop systems that don’t just locate information—they enhance comprehension, uncover meaningful connections, and deliver contextually relevant results. A central focus of our research is Retrieval-Augmented Generation (RAG), leveraging the remarkable capabilities of LLMs while ensuring precision, transparency, and reliability.

Through this work, we aim to fundamentally transform the digital information landscape, building technologies that bridge vast, complex data ecosystems and intuitive human understanding. Our efforts carry broad implications across domains where intelligent information access is critical, from science and education to business, healthcare, and governance.

Join us as we push the boundaries of Large Language Models, Retrieval-Augmented Generation, and Neural IR to advance how machines understand and interact with information.

Important Notice

Please do not contact us for PhD positions or paid RA (Research Assistant) positions. We currently do not have funding and will not be able to reply to such emails.

We do not plan to hire more RAs or PhD students in the foreseeable future unless we secure a major grant.

However, if you are looking to gain research experience and work with us on a project that could lead to a research paper, please contact the PI; he would be happy to collaborate with you. Please note that these positions will be unpaid.

Thank you for your understanding.

Announcements

  • Organizing ProActLLM 2025: A Workshop on Proactive Conversational AI 🤖💬

    I’m thrilled to announce that I’m organizing ProActLLM: Proactive Conversational Information Seeking with Large Language Models, a workshop co-located with CIKM 2025, along with some of the best researchers in the field of IR/NLP. 📅 November 14, 2025📍 Coex, Seoul, South Korea🌐 https://proactllm.github.io/ From Reactive to Proactive: The Next Frontier Think about today’s AI assistants…. Read more

  • Paper Accepted to SISAP 2024! 📊

    Excited to share that our paper “On the Theoretical Advantages of Bilinear Similarities in Dense Retrieval” has been accepted to the International Conference on Similarity Search and Applications (SISAP)! 📄 Paper: https://link.springer.com/chapter/10.1007/978-3-032-06069-3_11 💻 Code: https://github.com/shubham526/bilinear-projection-theory Why Bilinear Similarities Matter Most dense retrieval models rely on simple dot-product similarity—multiply query and document embeddings and sum them… Read more

  • Paper Accepted to SIGIR-AP 2025! 🎉

    I’m excited to announce that our paper “REGENT: Relevance-Guided Attention for Entity-Aware Multi-Vector Neural Re-Ranking” has been accepted to SIGIR-AP 2025! 📄 Paper: https://arxiv.org/abs/2510.11592 💻 Code: https://github.com/shubham526/SIGIR-AP-2025REGENT What’s REGENT? When you search through long, complex documents, you naturally focus on key entities and concepts—names, places, organizations—that help you understand what’s relevant. But most neural search… Read more

  • Paper Accepted to SIGIR 2025! 🎯

    Thrilled to announce that our paper “QDER: Query-Specific Document and Entity Representations for Multi-Vector Document Re-Ranking” has been accepted to SIGIR 2025—the premier conference in information retrieval! 📄 Paper: https://dl.acm.org/doi/pdf/10.1145/3726302.3730065 💻 Code: https://github.com/shubham526/SIGIR2025-QDER Bridging Two Worlds in Neural IR Neural information retrieval has evolved along two parallel paths: What if we could combine the best… Read more