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Information Retrieval Lab (Pham Huu Long)
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The lab uses machine learning to create information retrieval algorithms.
AboutAbout the lab
Researching technology for finding the information you are looking for.
The Knowledge Acquisition System Lab (KASYS, the Kato-Pham Lab) conducts research on information retrieval.
Its main research areas include retrieval models and ranking, learning to rank, search intent estimation, and recommender systems.
The lab often conducts research that uses large language models and machine learning to create high-performing algorithms.
As of 2026, the lab is based at the University of Tsukuba and the National Institute of Informatics, and belongs to the University of Tsukuba Information Retrieval Research Group.
Key terms
- Information retrieval
- Technology for finding, within a large amount of information, what matches the information being sought.
- Learning to rank
- A method that lets machine learning determine the order of search results.
- Large language model
- An AI model trained on large amounts of text that can understand and generate text.
NewsLab news
Paper accepted at CIKM 2026
Paper accepted at SIGIR 2026
PhD student received the Committee Special Award at the 32nd Annual Meeting of the Association for Natural Language Processing
Master's student received the Sponsor Award (Recruit Co., Ltd.) at DEIM 2026
ResearchResearch themes
Centered on information retrieval, the lab studies retrieval models and ranking, analysis of search users' behavior, recommender systems, and more. As of 2025, its priority themes are search algorithms based on large language models and client-side information retrieval systems.
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MembersFaculty
The members of the Knowledge Acquisition System Lab consist of faculty, researchers, students in the doctoral, master's, and undergraduate programs, and collaborators.As of 2026
- Associate ProfessorMakoto Kato
- Project Assistant ProfessorPham Huu Long
VoicesStudent voices
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The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Strand Bookstore shelves” Acebarry / CC0 (cropped)
- Searching Past Conversations Mid-Utterance: “13th century tile, conversation. iran” Creator: 1260-80 Photographer: Denman Waldo Ross (1853–1935) / Public domain (cropped)
- Related lab (Fusion Intelligence Design Lab): “Estimating Greenhouse Gas Concentration from Space using Machine Learning at Laboratoire LMD” Ecole polytechnique / Jérémy Barande / CC BY-SA 2.0 (cropped)
- Related lab (Library Management Strategy Lab): “Periodicals Quiet Reading Room Chapel Hill Public Library” Bbfd / CC BY-SA 4.0 (cropped)
- Related lab (Information Retrieval Lab (Masao Takaku)): “St. Elizabeth's Hospital, Wash. D.C In 1918 - Corner of reading room - American Library Association - NARA - 20801166 (cropped)” 作者不詳 / Public domain (cropped)
- Related lab (Web Information Systems Lab (Atsushi Matsumura)): “Kisosaki Town Library reading seats ac” Asturio Cantabrio / CC BY-SA 4.0 (cropped)
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