Search Results for author: Dawei Cheng

Found 19 papers, 9 papers with code

Hypergraph Self-supervised Learning with Sampling-efficient Signals

no code implementations18 Apr 2024 Fan Li, Xiaoyang Wang, Dawei Cheng, Wenjie Zhang, Ying Zhang, Xuemin Lin

Self-supervised learning (SSL) provides a promising alternative for representation learning on hypergraphs without costly labels.

Generation is better than Modification: Combating High Class Homophily Variance in Graph Anomaly Detection

no code implementations15 Mar 2024 Rui Zhang, Dawei Cheng, Xin Liu, Jie Yang, Yi Ouyang, Xian Wu, Yefeng Zheng

We find that in graph anomaly detection, the homophily distribution differences between different classes are significantly greater than those in homophilic and heterophilic graphs.

Graph Anomaly Detection Graph Classification +1

Multi-Patch Prediction: Adapting LLMs for Time Series Representation Learning

no code implementations7 Feb 2024 Yuxuan Bian, Xuan Ju, Jiangtong Li, Zhijian Xu, Dawei Cheng, Qiang Xu

In this study, we present aLLM4TS, an innovative framework that adapts Large Language Models (LLMs) for time-series representation learning.

Contrastive Learning Representation Learning +3

Two Heads Are Better Than One: Boosting Graph Sparse Training via Semantic and Topological Awareness

no code implementations2 Feb 2024 Guibin Zhang, Yanwei Yue, Kun Wang, Junfeng Fang, Yongduo Sui, Kai Wang, Yuxuan Liang, Dawei Cheng, Shirui Pan, Tianlong Chen

Specifically, GST initially constructs a topology & semantic anchor at a low training cost, followed by performing dynamic sparse training to align the sparse graph with the anchor.

Adversarial Defense Graph Learning

Learning Knowledge-Enhanced Contextual Language Representations for Domain Natural Language Understanding

no code implementations12 Nov 2023 Ruyao Xu, Taolin Zhang, Chengyu Wang, Zhongjie Duan, Cen Chen, Minghui Qiu, Dawei Cheng, Xiaofeng He, Weining Qian

In the experiments, we evaluate KANGAROO over various knowledge-aware and general NLP tasks in both full and few-shot learning settings, outperforming various KEPLM training paradigms performance in closed-domains significantly.

Contrastive Learning Data Augmentation +4

CFGPT: Chinese Financial Assistant with Large Language Model

1 code implementation19 Sep 2023 Jiangtong Li, Yuxuan Bian, Guoxuan Wang, Yang Lei, Dawei Cheng, Zhijun Ding, Changjun Jiang

The CFAPP is centered on large language models (LLMs) and augmented with additional modules to ensure multifaceted functionality in real-world application.

Decision Making Language Modelling +2

CSPRD: A Financial Policy Retrieval Dataset for Chinese Stock Market

1 code implementation8 Sep 2023 JinYuan Wang, Hai Zhao, Zhong Wang, Zeyang Zhu, Jinhao Xie, Yong Yu, Yongjian Fei, Yue Huang, Dawei Cheng

In recent years, great advances in pre-trained language models (PLMs) have sparked considerable research focus and achieved promising performance on the approach of dense passage retrieval, which aims at retrieving relative passages from massive corpus with given questions.

Passage Retrieval Retrieval

Temporal and Heterogeneous Graph Neural Network for Financial Time Series Prediction

2 code implementations9 May 2023 Sheng Xiang, Dawei Cheng, Chencheng Shang, Ying Zhang, Yuqi Liang

The price movement prediction of stock market has been a classical yet challenging problem, with the attention of both economists and computer scientists.

Graph Attention Relation +2

Defending Graph Neural Networks via Tensor-Based Robust Graph Aggregation

no code implementations29 Sep 2021 Jianfu Zhang, Yan Hong, Dawei Cheng, Liqing Zhang, Qibin Zhao

In this paper, we propose a tensor-based framework for GNNs to learn robust graphs from adversarial graphs by aggregating predefined robust graphs to enhance the robustness of GNNs via tensor approximation.

Graph Neural Network for Fraud Detection via Spatial-Temporal Attention

1 code implementation TKDE 2020 Dawei Cheng, Xiaoyang Wang, Ying Zhang, Liqing Zhang

But manually generating features needs domain knowledge and may lay behind the modus operandi of fraud, which means we need to automatically focus on the most relevant fraudulent behavior patterns in the online detection system.

Fraud Detection

iConViz: Interactive Visual Exploration of the Default Contagion Risk of Networked-Guarantee Loans

no code implementations16 Jun 2020 Zhibin Niu, Runlin Li, Junqi Wu, Dawei Cheng, Jiawan Zhang

Groups of enterprises can serve as guarantees for one another and form complex networks when obtaining loans from commercial banks.

Spatio-Temporal Attention-Based Neural Network for Credit Card Fraud Detection

1 code implementation AAAI 2020 Dawei Cheng, Sheng Xiang, Chencheng Shang, Yiyi Zhang, Fangzhou Yang, Liqing Zhang

But manually generating features needs domain knowledge and may lay behind the modus operandi of fraud, which means we need to automatically focus on the most relevant patterns in fraudulent behavior.

Fraud Detection

Exploiting Motion Information from Unlabeled Videos for Static Image Action Recognition

no code implementations1 Dec 2019 Yiyi Zhang, Li Niu, Ziqi Pan, Meichao Luo, Jianfu Zhang, Dawei Cheng, Liqing Zhang

Specifically, the VRE module includes a proxy task which imposes pseudo motion label constraint and temporal coherence constraint on unlabeled videos, while the MRA module could predict the motion information of a static action image by exploiting unlabeled videos.

Action Recognition Self-Supervised Learning

Image Cropping with Composition and Saliency Aware Aesthetic Score Map

no code implementations24 Nov 2019 Yi Tu, Li Niu, Weijie Zhao, Dawei Cheng, Liqing Zhang

Aesthetic image cropping is a practical but challenging task which aims at finding the best crops with the highest aesthetic quality in an image.

Image Cropping

Learning from Web Data with Self-Organizing Memory Module

no code implementations CVPR 2020 Yi Tu, Li Niu, Junjie Chen, Dawei Cheng, Liqing Zhang

However, crawled web images usually have two types of noises, label noise and background noise, which induce extra difficulties in utilizing them effectively.

Image Classification

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