Search Results for author: Cheuk Hang Leung

Found 10 papers, 3 papers with code

Unveiling the Potential of Robustness in Evaluating Causal Inference Models

no code implementations28 Feb 2024 Yiyan Huang, Cheuk Hang Leung, Siyi Wang, Yijun Li, Qi Wu

The growing demand for personalized decision-making has led to a surge of interest in estimating the Conditional Average Treatment Effect (CATE).

Causal Inference counterfactual +2

SpecFormer: Guarding Vision Transformer Robustness via Maximum Singular Value Penalization

no code implementations2 Jan 2024 Xixu Hu, Runkai Zheng, Jindong Wang, Cheuk Hang Leung, Qi Wu, Xing Xie

In this study, we address this gap by introducing SpecFormer, specifically designed to enhance ViTs' resilience against adversarial attacks, with support from carefully derived theoretical guarantees.

Computational Efficiency

The Causal Impact of Credit Lines on Spending Distributions

1 code implementation16 Dec 2023 Yijun Li, Cheuk Hang Leung, Xiangqian Sun, Chaoqun Wang, Yiyan Huang, Xing Yan, Qi Wu, Dongdong Wang, Zhixiang Huang

Consumer credit services offered by e-commerce platforms provide customers with convenient loan access during shopping and have the potential to stimulate sales.

Probabilistic Learning of Multivariate Time Series with Temporal Irregularity

1 code implementation15 Jun 2023 Yijun Li, Cheuk Hang Leung, Qi Wu

Multivariate sequential data collected in practice often exhibit temporal irregularities, including nonuniform time intervals and component misalignment.

Imputation Time Series

Deep into The Domain Shift: Transfer Learning through Dependence Regularization

1 code implementation31 May 2023 Shumin Ma, Zhiri Yuan, Qi Wu, Yiyan Huang, Xixu Hu, Cheuk Hang Leung, Dongdong Wang, Zhixiang Huang

This paper proposes a new domain adaptation approach in which one can measure the differences in the internal dependence structure separately from those in the marginals.

Domain Adaptation Transfer Learning

Robust Causal Learning for the Estimation of Average Treatment Effects

no code implementations5 Sep 2022 Yiyan Huang, Cheuk Hang Leung, Xing Yan, Qi Wu, Shumin Ma, Zhiri Yuan, Dongdong Wang, Zhixiang Huang

Theoretically, the RCL estimators i) are as consistent and doubly robust as the DML estimators, and ii) can get rid of the error-compounding issue.

Decision Making

Moderately-Balanced Representation Learning for Treatment Effects with Orthogonality Information

no code implementations5 Sep 2022 Yiyan Huang, Cheuk Hang Leung, Shumin Ma, Qi Wu, Dongdong Wang, Zhixiang Huang

In this paper, we propose a moderately-balanced representation learning (MBRL) framework based on recent covariates balanced representation learning methods and orthogonal machine learning theory.

Learning Theory Multi-Task Learning +2

Robust Orthogonal Machine Learning of Treatment Effects

no code implementations22 Mar 2021 Yiyan Huang, Cheuk Hang Leung, Qi Wu, Xing Yan

Theoretically, the RCL estimators i) satisfy the (higher-order) orthogonal condition and are as \textit{consistent and doubly robust} as the DML estimators, and ii) get rid of the error-compounding issue.

BIG-bench Machine Learning

The Causal Learning of Retail Delinquency

no code implementations17 Dec 2020 Yiyan Huang, Cheuk Hang Leung, Xing Yan, Qi Wu, Nanbo Peng, Dongdong Wang, Zhixiang Huang

Classical estimators overlook the confounding effects and hence the estimation error can be magnificent.

Understanding Distributional Ambiguity via Non-robust Chance Constraint

no code implementations3 Jun 2019 Qi Wu, Shumin Ma, Cheuk Hang Leung, Wei Liu, Nanbo Peng

Without the boundedness constraint, the CCO problem is shown to perform uniformly better than the DRO problem, irrespective of the radius of the ambiguity set, the choice of the divergence measure, or the tail heaviness of the center distribution.

Portfolio Optimization

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