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DCU MemoriEase at the NTCIR-18 Lifelog 6 Task

Tran, Quang-Linh orcid logoORCID: 0000-0002-5409-0916, Nguyen, Binh T. orcid logoORCID: 0000-0001-5249-9702, Jones, Gareth J.F. orcid logoORCID: 0000-0003-2923-8365 and Gurrin, Cathal orcid logoORCID: 0000-0003-2903-3968 (2025) DCU MemoriEase at the NTCIR-18 Lifelog 6 Task. In: The 18th NTCIR Conference on Evaluation of Information Access Technologies, 10-13 June, 2025, Tokyo, Japan.

Abstract
We present the participation of the MemoriEase lifelog retrieval system in the NTCIR-18 Lifelog 6 Task. This current MemoriEase system is an automatic and enhanced version of the MemoriEase system at the Lifelog Search Challenge 2024 (LSC). We report our methods for the two core sub-tasks in the NTCIR-18 Lifelog 6 task, Lifelog Semantic Access (LSAT) and Lifelog Question Answer (LQAT). We enhance the main architecture of the MemoriEase system utilizing the BLIP2 and CLIP embedding models to extract visual embedding and perform a comparison between the two models. In addition, we also use pseudo-relevance feedback for ad-hoc queries. For the LQAT sub-task, we use our retrieval model as the retriever and GPT-4o as a reader to generate answers to questions. Results of the LSAT sub-task show that our system found 369 images in 1,995 relevant images. The performance on known-item search queries is higher than on Ad-hoc queries, with 28.22% R@ 5 compared to 5.98% R@ 5, respectively. In the LQAT sub-task, the LLM model generates 8 correct answers in 24 questions. Although the performance is not high, it shows the advantages and drawbacks of the MemoriEase retrieval system and the QA model.
Metadata
Item Type:Conference or Workshop Item (Paper)
Event Type:Conference
Refereed:Yes
Uncontrolled Keywords:Lifelog, information retrieval, personal data
Subjects:Computer Science > Information retrieval
Computer Science > Lifelog
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Engineering and Computing > School of Computing
Research Institutes and Centres > ADAPT
Published in: NTCIR-18: Proceedings of the 18th NTCIR Conference on Evaluation ofInformation Access Technologies. . NTCIR.
Publisher:NTCIR
Official URL:https://research.nii.ac.jp/ntcir/ntcir-18/conferen...
Copyright Information:Authors
Funders:ADAPT
ID Code:31573
Deposited On:24 Sep 2025 10:05 by Quang-Linh Tran . Last Modified 24 Sep 2025 10:05
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