activity
20122025
most citedSyndromic surveillance using search query logs and user location information from smartphones against COVID-19 clusters in Japan

31 citations · 36 across the 9 of their papers we have counts for

collaborators
Showing cs.IRShow all

5 papers · 1 filter

cs.IR2025

Effect of Model Merging in Domain-Specific Ad-hoc Retrieval

Taiga Sasaki, Takehiro Yamamoto, Hiroaki Ohshima +1

In this study, we evaluate the effect of model merging in ad-hoc retrieval tasks. Model merging is a technique that combines the diverse characteristics of multiple models. We hypo…

cs.IR2023

Towards Consistency Filtering-Free Unsupervised Learning for Dense Retrieval

Haoxiang Shi, Sumio Fujita, Tetsuya Sakai

Domain transfer is a prevalent challenge in modern neural Information Retrieval (IR). To overcome this problem, previous research has utilized domain-specific manual annotations an…

cs.IR2020★ 31 cited

Syndromic surveillance using search query logs and user location information from smartphones against COVID-19 clusters in Japan

Shohei Hisada, Taichi Murayama, Kota Tsubouchi +4

[Background] Two clusters of coronavirus disease 2019 (COVID-19) were confirmed in Hokkaido, Japan in February 2020. To capture the clusters, this study employs Web search query lo…

cs.IR2019★ 3 cited

BanditRank: Learning to Rank Using Contextual Bandits

Phanideep Gampa, Sumio Fujita

We propose an extensible deep learning method that uses reinforcement learning to train neural networks for offline ranking in information retrieval (IR). We call our method Bandit…

cs.IR2017

A Short Note on Proximity-based Scoring of Documents with Multiple Fields

Tomohiro Manabe, Sumio Fujita

The BM25 ranking function is one of the most well known query relevance document scoring functions and many variations of it are proposed. The BM25F function is one of its adaptati…