Search Results for author: Shota Yasui

Found 14 papers, 4 papers with code

Automatic Debiased Learning from Positive, Unlabeled, and Exposure Data

no code implementations8 Mar 2023 Masahiro Kato, Shuting Wu, Kodai Kureishi, Shota Yasui

Therefore, the positive labels that we observe are a combination of both the exposure and the labeling, which creates a selection bias problem for the observed positive samples.

Binary Classification Recommendation Systems +1

Learning Causal Models from Conditional Moment Restrictions by Importance Weighting

no code implementations3 Aug 2021 Masahiro Kato, Masaaki Imaizumi, Kenichiro McAlinn, Haruo Kakehi, Shota Yasui

To address this issue, we propose a method that transforms conditional moment restrictions to unconditional moment restrictions through importance weighting, using a conditional density ratio estimator.

Causal Inference

Learning Classifiers under Delayed Feedback with a Time Window Assumption

no code implementations28 Sep 2020 Masahiro Kato, Shota Yasui

We consider training a binary classifier under delayed feedback (\emph{DF learning}).

Selection bias

Off-Policy Evaluation and Learning for External Validity under a Covariate Shift

1 code implementation NeurIPS 2020 Masahiro Kato, Masatoshi Uehara, Shota Yasui

Then, we propose doubly robust and efficient estimators for OPE and OPL under a covariate shift by using a nonparametric estimator of the density ratio between the historical and evaluation data distributions.

Off-policy evaluation

Debiased Off-Policy Evaluation for Recommendation Systems

no code implementations20 Feb 2020 Yusuke Narita, Shota Yasui, Kohei Yata

Efficient methods to evaluate new algorithms are critical for improving interactive bandit and reinforcement learning systems such as recommendation systems.

counterfactual Off-policy evaluation +2

Dual Learning Algorithm for Delayed Conversions

no code implementations4 Oct 2019 Yuta Saito, Gota Morishita, Shota Yasui

To overcome these challenges, we propose two unbiased estimators: one for CVR prediction and the other for bias estimation.

Fatigue-Aware Ad Creative Selection

1 code implementation21 Aug 2019 Daisuke Moriwaki, Komei Fujita, Shota Yasui, Takahiro Hoshino

In online display advertising, selecting the most effective ad creative (ad image) for each impression is a crucial task for DSPs (Demand-Side Platforms) to fulfill their goals (click-through rate, number of conversions, revenue, and brand improvement).

Marketing

Efficient Counterfactual Learning from Bandit Feedback

no code implementations10 Sep 2018 Yusuke Narita, Shota Yasui, Kohei Yata

What is the most statistically efficient way to do off-policy evaluation and optimization with batch data from bandit feedback?

Causal Inference counterfactual +2

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