Search Results for author: Zhimei Ren

Found 9 papers, 6 papers with code

Confidence on the Focal: Conformal Prediction with Selection-Conditional Coverage

1 code implementation6 Mar 2024 Ying Jin, Zhimei Ren

In such cases, marginally valid conformal prediction intervals may not provide valid coverage for the focal unit(s) due to selection bias.

Conformal Prediction Drug Discovery +4

Iterative Approximate Cross-Validation

1 code implementation5 Mar 2023 Yuetian Luo, Zhimei Ren, Rina Foygel Barber

Cross-validation (CV) is one of the most popular tools for assessing and selecting predictive models.

Computational Efficiency

Policy learning "without'' overlap: Pessimism and generalized empirical Bernstein's inequality

no code implementations19 Dec 2022 Ying Jin, Zhimei Ren, Zhuoran Yang, Zhaoran Wang

Existing policy learning methods rely on a uniform overlap assumption, i. e., the propensities of exploring all actions for all individual characteristics are lower bounded in the offline dataset.

Policy Learning with Adaptively Collected Data

1 code implementation5 May 2021 Ruohan Zhan, Zhimei Ren, Susan Athey, Zhengyuan Zhou

Learning optimal policies from historical data enables personalization in a wide variety of applications including healthcare, digital recommendations, and online education.

Multi-Armed Bandits

Conformalized Survival Analysis

2 code implementations17 Mar 2021 Emmanuel J. Candès, Lihua Lei, Zhimei Ren

Existing survival analysis techniques heavily rely on strong modelling assumptions and are, therefore, prone to model misspecification errors.

Conformal Prediction Prediction Intervals +3

Online Multi-Armed Bandits with Adaptive Inference

no code implementations NeurIPS 2021 Maria Dimakopoulou, Zhimei Ren, Zhengyuan Zhou

During online decision making in Multi-Armed Bandits (MAB), one needs to conduct inference on the true mean reward of each arm based on data collected so far at each step.

Causal Inference Decision Making +2

Derandomizing Knockoffs

2 code implementations4 Dec 2020 Zhimei Ren, Yuting Wei, Emmanuel Candès

Model-X knockoffs is a general procedure that can leverage any feature importance measure to produce a variable selection algorithm, which discovers true effects while rigorously controlling the number or fraction of false positives.

Feature Importance Variable Selection Methodology Applications

Dynamic Batch Learning in High-Dimensional Sparse Linear Contextual Bandits

no code implementations27 Aug 2020 Zhimei Ren, Zhengyuan Zhou

We study the problem of dynamic batch learning in high-dimensional sparse linear contextual bandits, where a decision maker, under a given maximum-number-of-batch constraint and only able to observe rewards at the end of each batch, can dynamically decide how many individuals to include in the next batch (at the end of the current batch) and what personalized action-selection scheme to adopt within each batch.

Decision Making Marketing +2

Batched Multi-armed Bandits Problem

1 code implementation NeurIPS 2019 Zijun Gao, Yanjun Han, Zhimei Ren, Zhengqing Zhou

While the minimax regret for the two-armed stochastic bandits has been completely characterized in \cite{perchet2016batched}, the effect of the number of arms on the regret for the multi-armed case is still open.

Multi-Armed Bandits

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