Search Results for author: Ruoqing Zhu

Found 14 papers, 4 papers with code

Stage-Aware Learning for Dynamic Treatments

no code implementations30 Oct 2023 Hanwen Ye, Wenzhuo Zhou, Ruoqing Zhu, Annie Qu

In particular, the proposed learning scheme builds a more general framework which includes the popular outcome weighted learning framework as a special case of ours.

Decision Making

Distributional Shift-Aware Off-Policy Interval Estimation: A Unified Error Quantification Framework

no code implementations23 Sep 2023 Wenzhuo Zhou, Yuhan Li, Ruoqing Zhu, Annie Qu

This task faces two primary challenges: providing a comprehensive and rigorous error quantification in CI estimation, and addressing the distributional shift that results from discrepancies between the distribution induced by the target policy and the offline data-generating process.

Off-policy evaluation

Quasi-optimal Reinforcement Learning with Continuous Actions

no code implementations21 Jan 2023 Yuhan Li, Wenzhuo Zhou, Ruoqing Zhu

Many real-world applications of reinforcement learning (RL) require making decisions in continuous action environments.

reinforcement-learning Reinforcement Learning (RL)

Calibrate and Debias Layer-wise Sampling for Graph Convolutional Networks

1 code implementation1 Jun 2022 Yifan Chen, Tianning Xu, Dilek Hakkani-Tur, Di Jin, Yun Yang, Ruoqing Zhu

This paper revisits the approach from a matrix approximation perspective, and identifies two issues in the existing layer-wise sampling methods: suboptimal sampling probabilities and estimation biases induced by sampling without replacement.

Confidence Band Estimation for Survival Random Forests

1 code implementation26 Apr 2022 Sarah Elizabeth Formentini, Wei Liang, Ruoqing Zhu

The idea is to estimate the variance-covariance matrix of the cumulative hazard function prediction on a grid of time points.

valid

On Variance Estimation of Random Forests with Infinite-Order U-statistics

1 code implementation18 Feb 2022 Tianning Xu, Ruoqing Zhu, Xiaofeng Shao

To bridge these gaps in the literature, we propose a new view of the Hoeffding decomposition for variance estimation that leads to an unbiased estimator.

Ensemble Learning

Random Forest Weighted Local Fréchet Regression with Random Objects

no code implementations10 Feb 2022 Rui Qiu, Zhou Yu, Ruoqing Zhu

Statistical analysis is increasingly confronted with complex data from metric spaces.

regression

Estimating Optimal Infinite Horizon Dynamic Treatment Regimes via pT-Learning

no code implementations20 Oct 2021 Wenzhuo Zhou, Ruoqing Zhu, Annie Qu

To address these challenges, we propose a Proximal Temporal consistency Learning (pT-Learning) framework to estimate an optimal regime that is adaptively adjusted between deterministic and stochastic sparse policy models.

Decision Making

Revisiting Layer-wise Sampling in Fast Training for Graph Convolutional Networks

no code implementations29 Sep 2021 Yifan Chen, Tianning Xu, Dilek Hakkani-Tur, Di Jin, Yun Yang, Ruoqing Zhu

To accelerate the training of graph convolutional networks (GCN), many sampling-based methods have been developed for approximating the embedding aggregation.

Dermoscopic Image Classification with Neural Style Transfer

no code implementations17 May 2021 Yutong Li, Ruoqing Zhu, Annie Qu, Mike Yeh

We represent each dermoscopic image as the style image and transfer the style of the lesion onto a homogeneous content image.

Classification Image Classification +5

Estimating heterogeneous treatment effects with right-censored data via causal survival forests

2 code implementations27 Jan 2020 Yifan Cui, Michael R. Kosorok, Erik Sverdrup, Stefan Wager, Ruoqing Zhu

Forest-based methods have recently gained in popularity for non-parametric treatment effect estimation.

Constructing Stabilized Dynamic Treatment Regimes

no code implementations3 Aug 2018 Ying-Qi Zhao, Ruoqing Zhu, Guanhua Chen, Yingye Zheng

We propose a new method termed stabilized O-learning for deriving stabilized dynamic treatment regimes, which are sequential decision rules for individual patients that not only adapt over the course of the disease progression but also remain consistent over time in format.

Methodology

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