Yuta Saito
Yuta Saito
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Off-Policy Evaluation of Ranking Policies under Diverse User Behavior
Ranking interfaces are everywhere in online platforms. There is thus an ever growing interest in their Off-Policy Evaluation (OPE), …
Haruka Kiyohara
,
Tatsuya Matsuhiro
,
Yusuke Narita
,
Nobuyuki Shimizu
,
Yasuo Yamamoto
,
Yuta Saito
Cite
Code
arXiv
Off-Policy Evaluation for Large Action Spaces via Conjunct Effect Modeling
We study off-policy evaluation (OPE) of contextual bandit policies for large discrete action spaces where conventional …
Yuta Saito
,
Qingyang Ren
,
Thorsten Joachims
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Code
arXiv
Policy-Adaptive Estimator Selection for Off-Policy Evaluation
Off-policy evaluation (OPE) aims to accurately evaluate the performance of counterfactual policies using only offline logged data. …
Takuma Udagawa
,
Haruka Kiyohara
,
Yusuke Narita
,
Yuta Saito
,
Kei Tateno
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Code
Slides
arXiv
Fair Ranking as Fair Division: Impact-Based Individual Fairness in Ranking
Rankings have become the primary interface of many two-sided markets. Many have noted that the rankings not only affect the …
Yuta Saito
,
Thorsten Joachims
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Code
Video
Slides
arXiv
Proceedings
Off-Policy Evaluation for Large Action Spaces via Embeddings
Off-policy evaluation (OPE) in contextual bandits has seen rapid adoption in real-world systems, since it enables offline evaluation of …
Yuta Saito
,
Thorsten Joachims
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Code
Video
Slides
arXiv
Proceedings
Towards Resolving Propensity Contradiction in Offline Recommender Learning
We study offline recommender learning from explicit rating feedback in the presence of selection bias. A current promising solution for …
Yuta Saito
,
Masahiro Nomura
Cite
Proceedings
Doubly Robust Off-Policy Evaluation for Ranking Policies under the Cascade Behavior Model
In real-world recommender systems and search engines, optimizing ranking decisions to present a ranked list of relevant items is …
Haruka Kiyohara
,
Yuta Saito
,
Tatsuya Matsuhiro
,
Yusuke Narita
,
Nobuyuki Shimizu
,
Yasuo Yamamoto
Cite
Code
arXiv
Proceedings
A Real-World Implementation of Unbiased Lift-based Bidding System
Daisuke Moriwaki
,
Yuta Hayakawa
,
Isshu Munemasa
,
Yuta Saito
,
Akira Matsui
,
Masashi Shibata
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Open Bandit Dataset and Pipeline: Towards Realistic and Reproducible Off-Policy Evaluation
Off-policy evaluation (OPE) aims to estimate the performance of hypothetical policies using data generated by a different policy. …
Yuta Saito
,
Shunsuke Aihara
,
Megumi Matsutani
,
Yusuke Narita
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Code
Dataset
Proceedings
arXiv
Efficient Hyperparameter Optimization under Multi-Source Covariate Shift
A typical assumption in supervised machine learning is that the train (source) and test (target) datasets follow completely the same …
Masahiro Nomura
,
Yuta Saito
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Code
Proceedings
arXiv
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