Search Results for author: Ziwei Zhang

Found 38 papers, 16 papers with code

Adaptive Tokenization: On the Hop-Overpriority Problem in Tokenized Graph Learning Models

no code implementations19 May 2025 Zhibiao Wang, Yunlong Zhou, Ziwei Zhang, Mengmei Zhang, Shirui Pan, Chunming Hu, Xiao Wang

To address this problem, we propose the Learnable Graph Token List (LGTL), a plug-and-play module to replace hand-designed token lists in TGLMs.

Graph Attention Graph Learning

BadApex: Backdoor Attack Based on Adaptive Optimization Mechanism of Black-box Large Language Models

no code implementations18 Apr 2025 Zhengxian Wu, Juan Wen, Wanli Peng, Ziwei Zhang, Yinghan Zhou, Yiming Xue

In this paper, we propose a novel backdoor attack based on adaptive optimization mechanism of black-box large language models (BadApex), which leverages a black-box LLM to generate poisoned text through a refined prompt.

Backdoor Attack

MiZero: The Shadowy Defender Against Text Style Infringements

no code implementations30 Mar 2025 Ziwei Zhang, Juan Wen, Wanli Peng, Zhengxian Wu, Yinghan Zhou, Yiming Xue

This scheme establishes a precise watermark domain to protect the copyrighted style, surpassing traditional watermarking methods that distort the style characteristics.

In-Context Learning

Behavior Importance-Aware Graph Neural Architecture Search for Cross-Domain Recommendation

no code implementations11 Mar 2025 Chendi Ge, Xin Wang, Ziwei Zhang, Yijian Qin, Hong Chen, Haiyang Wu, Yang Zhang, Yuekui Yang, Wenwu Zhu

To the best of our knowledge, this is the first work to jointly optimize GNN architecture and behavior data importance for cross-domain recommendation.

Auxiliary Learning Neural Architecture Search +1

BotUmc: An Uncertainty-Aware Twitter Bot Detection with Multi-view Causal Inference

no code implementations4 Mar 2025 Tao Yang, Yang Hu, Feihong Lu, Ziwei Zhang, Qingyun Sun, JianXin Li

Therefore, we propose an uncertainty-aware bot detection method to inform the confidence and use the uncertainty score to pick a high-confidence decision from multiple views of a social network under different environments.

Causal Inference Twitter Bot Detection

Towards Lightweight Graph Neural Network Search with Curriculum Graph Sparsification

no code implementations24 Jun 2024 Beini Xie, Heng Chang, Ziwei Zhang, Zeyang Zhang, Simin Wu, Xin Wang, Yuan Meng, Wenwu Zhu

To search for optimal lightweight Graph Neural Networks (GNNs), we propose a Lightweight Graph Neural Architecture Search with Graph SparsIfication and Network Pruning (GASSIP) method.

Graph Neural Network Network Pruning +2

Causal-aware Graph Neural Architecture Search under Distribution Shifts

no code implementations26 May 2024 Peiwen Li, Xin Wang, Zeyang Zhang, Yijian Qin, Ziwei Zhang, Jialong Wang, Yang Li, Wenwu Zhu

We propose to handle the distribution shifts in the graph architecture search process by discovering and exploiting the causal relationship between graphs and architectures to search for the optimal architectures that can generalize under distribution shifts.

Graph Embedding Neural Architecture Search +1

Exploring the Potential of Large Language Models in Graph Generation

no code implementations21 Mar 2024 Yang Yao, Xin Wang, Zeyang Zhang, Yijian Qin, Ziwei Zhang, Xu Chu, Yuekui Yang, Wenwu Zhu, Hong Mei

In this paper, we propose LLM4GraphGen to explore the ability of LLMs for graph generation with systematical task designs and extensive experiments.

Drug Discovery Graph Generation +1

Unsupervised Graph Neural Architecture Search with Disentangled Self-supervision

no code implementations NeurIPS 2023 Zeyang Zhang, Xin Wang, Ziwei Zhang, Guangyao Shen, Shiqi Shen, Wenwu Zhu

To address the challenge, we propose a novel Disentangled Self-supervised Graph Neural Architecture Search (DSGAS) model, which is able to discover the optimal architectures capturing various latent graph factors in a self-supervised fashion based on unlabeled graph data.

Disentanglement Neural Architecture Search

Spectral Invariant Learning for Dynamic Graphs under Distribution Shifts

1 code implementation NeurIPS 2023 Zeyang Zhang, Xin Wang, Ziwei Zhang, Zhou Qin, Weigao Wen, Hui Xue, Haoyang Li, Wenwu Zhu

In this paper, we discover that there exist cases with distribution shifts unobservable in the time domain while observable in the spectral domain, and propose to study distribution shifts on dynamic graphs in the spectral domain for the first time.

Link Prediction Node Classification

Class Information Guided Reconstruction for Automatic Modulation Open-Set Recognition

no code implementations20 Dec 2023 Ziwei Zhang, Mengtao Zhu, Jiabin Liu, Yunjie Li, Shafei Wang

To enhance distinguishability, we design Class Conditional Vectors (CCVs) to match the latent representations extracted from input samples, achieving perfect reconstruction for known samples while yielding poor results for unknown ones.

Automatic Modulation Recognition Denoising +2

Out-of-Distribution Generalized Dynamic Graph Neural Network with Disentangled Intervention and Invariance Promotion

no code implementations24 Nov 2023 Zeyang Zhang, Xin Wang, Ziwei Zhang, Haoyang Li, Wenwu Zhu

In this paper, we propose Disentangled Intervention-based Dynamic graph Attention networks with Invariance Promotion (I-DIDA) to handle spatio-temporal distribution shifts in dynamic graphs by discovering and utilizing invariant patterns, i. e., structures and features whose predictive abilities are stable across distribution shifts.

Graph Attention Graph Neural Network

Disentangled Representation Learning with Large Language Models for Text-Attributed Graphs

no code implementations27 Oct 2023 Yijian Qin, Xin Wang, Ziwei Zhang, Wenwu Zhu

Text-attributed graphs (TAGs) are prevalent on the web and research over TAGs such as citation networks, e-commerce networks and social networks has attracted considerable attention in the web community.

Graph Neural Network Representation Learning

LLM4DyG: Can Large Language Models Solve Spatial-Temporal Problems on Dynamic Graphs?

1 code implementation26 Oct 2023 Zeyang Zhang, Xin Wang, Ziwei Zhang, Haoyang Li, Yijian Qin, Wenwu Zhu

Our main observations are: 1) LLMs have preliminary spatial-temporal understanding abilities on dynamic graphs, 2) Dynamic graph tasks show increasing difficulties for LLMs as the graph size and density increase, while not sensitive to the time span and data generation mechanism, 3) the proposed DST2 prompting method can help to improve LLMs' spatial-temporal understanding abilities on dynamic graphs for most tasks.

Graph Meets LLMs: Towards Large Graph Models

1 code implementation28 Aug 2023 Ziwei Zhang, Haoyang Li, Zeyang Zhang, Yijian Qin, Xin Wang, Wenwu Zhu

In order to promote applying large models for graphs forward, we present a perspective paper to discuss the challenges and opportunities associated with developing large graph models.

NAS-Bench-Graph: Benchmarking Graph Neural Architecture Search

1 code implementation18 Jun 2022 Yijian Qin, Ziwei Zhang, Xin Wang, Zeyang Zhang, Wenwu Zhu

To the best of our knowledge, our work is the first benchmark for graph neural architecture search.

Benchmarking Graph Neural Network +1

Learning to Solve Travelling Salesman Problem with Hardness-adaptive Curriculum

1 code implementation7 Apr 2022 Zeyang Zhang, Ziwei Zhang, Xin Wang, Wenwu Zhu

To solve these challenges, we first propose a principled hardness measurement to quantify the hardness of TSP instances.

Combinatorial Optimization

Out-Of-Distribution Generalization on Graphs: A Survey

1 code implementation16 Feb 2022 Haoyang Li, Xin Wang, Ziwei Zhang, Wenwu Zhu

This paper is the first systematic and comprehensive review of OOD generalization on graphs, to the best of our knowledge.

Out-of-Distribution Generalization Survey

Automated Graph Machine Learning: Approaches, Libraries, Benchmarks and Directions

1 code implementation4 Jan 2022 Xin Wang, Ziwei Zhang, Haoyang Li, Wenwu Zhu

However, as the literature on graph learning booms with a vast number of emerging methods and techniques, it becomes increasingly difficult to manually design the optimal machine learning algorithm for different graph-related tasks.

BIG-bench Machine Learning Graph Learning +1

Revisiting Transformation Invariant Geometric Deep Learning: Are Initial Representations All You Need?

no code implementations23 Dec 2021 Ziwei Zhang, Xin Wang, Zeyang Zhang, Peng Cui, Wenwu Zhu

Based on the experimental results, we advocate that TinvNN should be considered a new starting point and an essential baseline for further studies of transformation-invariant geometric deep learning.

All Combinatorial Optimization +2

OOD-GNN: Out-of-Distribution Generalized Graph Neural Network

no code implementations7 Dec 2021 Haoyang Li, Xin Wang, Ziwei Zhang, Wenwu Zhu

Our proposed OOD-GNN employs a novel nonlinear graph representation decorrelation method utilizing random Fourier features, which encourages the model to eliminate the statistical dependence between relevant and irrelevant graph representations through iteratively optimizing the sample graph weights and graph encoder.

Graph Neural Network Out-of-Distribution Generalization

Disentangled Contrastive Learning on Graphs

no code implementations NeurIPS 2021 Haoyang Li, Xin Wang, Ziwei Zhang, Zehuan Yuan, Hang Li, Wenwu Zhu

Then we propose a novel factor-wise discrimination objective in a contrastive learning manner, which can force the factorized representations to independently reflect the expressive information from different latent factors.

Contrastive Learning Self-Supervised Learning

Automated Machine Learning on Graphs: A Survey

2 code implementations1 Mar 2021 Ziwei Zhang, Xin Wang, Wenwu Zhu

Machine learning on graphs has been extensively studied in both academic and industry.

BIG-bench Machine Learning Graph Learning +2

Improving Accuracy and Diversity in Matching of Recommendation with Diversified Preference Network

no code implementations7 Feb 2021 Ruobing Xie, Qi Liu, Shukai Liu, Ziwei Zhang, Peng Cui, Bo Zhang, Leyu Lin

In this paper, we propose a novel Heterogeneous graph neural network framework for diversified recommendation (GraphDR) in matching to improve both recommendation accuracy and diversity.

Diversity Graph Attention +1

Asymmetric Transitivity Preserving Graph Embedding

1 code implementation ‏‏‎ ‎ 2020 Mingdong Ou, Peng Cui, Jian Pei, Ziwei Zhang, Wenwu Zhu

In particular, we develop a novel graph embedding algorithm, High-Order Proximity preserved Embedding (HOPE for short), which is scalable to preserve high-order proximities of large scale graphs and capable of capturing the asymmetric transitivity.

Graph Embedding Link Prediction

Correlating Edge, Pose with Parsing

1 code implementation CVPR 2020 Ziwei Zhang, Chi Su, Liang Zheng, Xiaodong Xie

Compared with the existing practice of feature concatenation, we find that uncovering the correlation among the three factors is a superior way of leveraging the pivotal contextual cues provided by edges and poses.

Feature Correlation Human Parsing

Deep Learning on Graphs: A Survey

1 code implementation11 Dec 2018 Ziwei Zhang, Peng Cui, Wenwu Zhu

Recently, substantial research efforts have been devoted to applying deep learning methods to graphs, resulting in beneficial advances in graph analysis techniques.

Deep Learning Reinforcement Learning +1

A Note on Spectral Clustering and SVD of Graph Data

no code implementations27 Sep 2018 Ziwei Zhang

Spectral clustering and Singular Value Decomposition (SVD) are both widely used technique for analyzing graph data.

Clustering

Billion-scale Network Embedding with Iterative Random Projection

2 code implementations7 May 2018 Ziwei Zhang, Peng Cui, Haoyang Li, Xiao Wang, Wenwu Zhu

Network embedding, which learns low-dimensional vector representation for nodes in the network, has attracted considerable research attention recently.

Distributed Computing Link Prediction +2

Trajectory Factory: Tracklet Cleaving and Re-connection by Deep Siamese Bi-GRU for Multiple Object Tracking

no code implementations12 Apr 2018 Cong Ma, Changshui Yang, Fan Yang, Yueqing Zhuang, Ziwei Zhang, Huizhu Jia, Xiaodong Xie

In this paper, we propose a novel tracklet processing method to cleave and re-connect tracklets on crowd or long-term occlusion by Siamese Bi-Gated Recurrent Unit (GRU).

Autonomous Driving Multi-Object Tracking +2

TIMERS: Error-Bounded SVD Restart on Dynamic Networks

1 code implementation27 Nov 2017 Ziwei Zhang, Peng Cui, Jian Pei, Xiao Wang, Wenwu Zhu

By setting a maximum tolerated error as a threshold, we can trigger SVD restart automatically when the margin exceeds this threshold. We prove that the time complexity of our method is linear with respect to the number of local dynamic changes, and our method is general across different types of dynamic networks.

Social and Information Networks

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