Kohei Ozaki
Data Science Competitions
I am a Kaggle Grandmaster (an honor for top competitors with outstanding data science skills) with 20 gold medals🏅 in Kaggle competitions. My highest Kaggle rank is 4th out of 530,000+ data scientists as of April 2016.
Below is a list of my prize-winning contests.
Hobby Project: Mahjong AI Competition
As a hobby project, I have been developing a Mahjong AI using reinforcement learning since 2022. I have also opened a Mahjong AI competition website, "AI Jansou (AI雀荘)".
AI Jansou allows users to participate in the competition by developing and submitting a bot program that runs on a specific Docker image. The submission programs compete against each other, and their rankings are determined by Elo ratings.
Publications (International Conference)
To see a full list of publications, see my Google Scholar page.
- Shuhei Yokoo, , Edgar Simo-Serra, Satoshi Iizuka, "Two-stage discriminative re-ranking for large-scale landmark retrieval", Proceeding on the CVPR'20 workshop on Image Matching: Local Features and Beyond, 2020. [arxiv]
- Yusuke Niitani, Toru Ogawa, Shuji Suzuki, Takuya Akiba, Tommi Kerola, , Shotaro Sano, "Team PFDet's Methods for Open Images Challenge 2019", 2019. [arXiv:1910.11534]
- , Shuhei Yokoo, "Large-scale landmark retrieval and recognition under a noisy and diverse dataset ", Technical report for Second Landmark Recognition Workshop to be held at CVPR'19, June 16th, 2019. [arxiv][github][dataset][slide1, slide2]
- , Masashi Shimbo, Mamoru Komachi, Yuji Matsumoto, "Using the mutual k-nearest neighbor graphs for semi-supervised classification on natural language data", Proceedings of the Fifteenth Conference on Computational Natural Language Learning (CoNLL'21), 2011.
Recent Activities
Talks (internatioal conference)
Lecture, Tutorial, Domestic conference, Meetup events, etc.
Books and Writings
Programming Contests
ACM/ICPC is an annual multi-tiered competitive programming competition among the universities of the world. I joined this contest with my friends at Tokyo University of Science and advanced to the Asia Regional Contest.
