Search Results for author: Ruizhong Qiu

Found 8 papers, 3 papers with code

Gradient Compressed Sensing: A Query-Efficient Gradient Estimator for High-Dimensional Zeroth-Order Optimization

no code implementations27 May 2024 Ruizhong Qiu, Hanghang Tong

In this paper, we propose *Gradient Compressed Sensing* (GraCe), a query-efficient and accurate estimator for sparse gradients that uses only $O\big(s\log\log\frac ds\big)$ queries per step and still achieves $O\big(\frac1T\big)$ rate of convergence.

Discrete-state Continuous-time Diffusion for Graph Generation

no code implementations19 May 2024 Zhe Xu, Ruizhong Qiu, Yuzhong Chen, Huiyuan Chen, Xiran Fan, Menghai Pan, Zhichen Zeng, Mahashweta Das, Hanghang Tong

Graph is a prevalent discrete data structure, whose generation has wide applications such as drug discovery and circuit design.

Drug Discovery Graph Generation

Ensuring User-side Fairness in Dynamic Recommender Systems

no code implementations29 Aug 2023 Hyunsik Yoo, Zhichen Zeng, Jian Kang, Ruizhong Qiu, David Zhou, Zhining Liu, Fei Wang, Charlie Xu, Eunice Chan, Hanghang Tong

In the ever-evolving landscape of user-item interactions, continual adaptation to newly collected data is crucial for recommender systems to stay aligned with the latest user preferences.

Fairness Recommendation Systems +1

Reconstructing Graph Diffusion History from a Single Snapshot

1 code implementation1 Jun 2023 Ruizhong Qiu, Dingsu Wang, Lei Ying, H. Vincent Poor, Yifang Zhang, Hanghang Tong

They are exclusively based on the maximum likelihood estimation (MLE) formulation and require to know true diffusion parameters.

Networked Time Series Imputation via Position-aware Graph Enhanced Variational Autoencoders

no code implementations29 May 2023 Dingsu Wang, Yuchen Yan, Ruizhong Qiu, Yada Zhu, Kaiyu Guan, Andrew J Margenot, Hanghang Tong

First, we define the problem of imputation over NTS which contains missing values in both node time series features and graph structures.

Decoder Imputation +4

DIMES: A Differentiable Meta Solver for Combinatorial Optimization Problems

1 code implementation8 Oct 2022 Ruizhong Qiu, Zhiqing Sun, Yiming Yang

Recently, deep reinforcement learning (DRL) models have shown promising results in solving NP-hard Combinatorial Optimization (CO) problems.

Combinatorial Optimization Meta-Learning +1

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