Search Results for author: Ning Gu

Found 20 papers, 9 papers with code

Negating Negatives: Alignment without Human Positive Samples via Distributional Dispreference Optimization

1 code implementation6 Mar 2024 Shitong Duan, Xiaoyuan Yi, Peng Zhang, Tun Lu, Xing Xie, Ning Gu

Large language models (LLMs) have revolutionized the role of AI, yet also pose potential risks of propagating unethical content.

Thyroid ultrasound diagnosis improvement via multi-view self-supervised learning and two-stage pre-training

no code implementations18 Feb 2024 Jian Wang, Xin Yang, Xiaohong Jia, Wufeng Xue, Rusi Chen, Yanlin Chen, Xiliang Zhu, Lian Liu, Yan Cao, Jianqiao Zhou, Dong Ni, Ning Gu

In this study, we proposed a multi-view contrastive self-supervised method to improve thyroid nodule classification and segmentation performance with limited manual labels.

Classification Segmentation +1

Frequency-aware Graph Signal Processing for Collaborative Filtering

no code implementations13 Feb 2024 Jiafeng Xia, Dongsheng Li, Hansu Gu, Tun Lu, Peng Zhang, Li Shang, Ning Gu

Graph Signal Processing (GSP) based recommendation algorithms have recently attracted lots of attention due to its high efficiency.

Collaborative Filtering

A Comprehensive Summarization and Evaluation of Feature Refinement Modules for CTR Prediction

1 code implementation8 Nov 2023 Fangye Wang, Hansu Gu, Dongsheng Li, Tun Lu, Peng Zhang, Li Shang, Ning Gu

In addition, we present a new architecture of assigning independent FR modules to separate sub-networks for parallel CTR models, as opposed to the conventional method of inserting a shared FR module on top of the embedding layer.

Benchmarking Click-Through Rate Prediction

AutoSeqRec: Autoencoder for Efficient Sequential Recommendation

1 code implementation14 Aug 2023 Sijia Liu, Jiahao Liu, Hansu Gu, Dongsheng Li, Tun Lu, Peng Zhang, Ning Gu

Sequential recommendation demonstrates the capability to recommend items by modeling the sequential behavior of users.

Collaborative Filtering Computational Efficiency +1

Recommendation Unlearning via Matrix Correction

no code implementations29 Jul 2023 Jiahao Liu, Dongsheng Li, Hansu Gu, Tun Lu, Jiongran Wu, Peng Zhang, Li Shang, Ning Gu

We conducted comprehensive experiments to validate the effectiveness of IMCorrect and the results demonstrate that IMCorrect is superior in completeness, utility, and efficiency, and is applicable in many recommendation unlearning scenarios.

Collaborative Filtering Recommendation Systems

Simulating News Recommendation Ecosystem for Fun and Profit

no code implementations23 May 2023 Guangping Zhang, Dongsheng Li, Hansu Gu, Tun Lu, Li Shang, Ning Gu

In this work, we propose SimuLine, a simulation platform to dissect the evolution of news recommendation ecosystems and present a detailed analysis of the evolutionary process and underlying mechanisms.

News Recommendation Recommendation Systems

Triple Structural Information Modelling for Accurate, Explainable and Interactive Recommendation

no code implementations23 Apr 2023 Jiahao Liu, Dongsheng Li, Hansu Gu, Tun Lu, Peng Zhang, Li Shang, Ning Gu

Specifically, TriSIM4Rec consists of 1) a dynamic ideal low-pass graph filter to dynamically mine co-occurrence information in user-item interactions, which is implemented by incremental singular value decomposition (SVD); 2) a parameter-free attention module to capture sequential information of user interactions effectively and efficiently; and 3) an item transition matrix to store the transition probabilities of item pairs.

Collaborative Filtering

Personalized Graph Signal Processing for Collaborative Filtering

no code implementations4 Feb 2023 Jiahao Liu, Dongsheng Li, Hansu Gu, Tun Lu, Peng Zhang, Li Shang, Ning Gu

However, the interaction signal may not be sufficient to accurately characterize user interests and the low-pass filters may ignore the useful information contained in the high-frequency component of the observed signals, resulting in suboptimal accuracy.

Collaborative Filtering

CL4CTR: A Contrastive Learning Framework for CTR Prediction

1 code implementation1 Dec 2022 Fangye Wang, Yingxu Wang, Dongsheng Li, Hansu Gu, Tun Lu, Peng Zhang, Ning Gu

Many Click-Through Rate (CTR) prediction works focused on designing advanced architectures to model complex feature interactions but neglected the importance of feature representation learning, e. g., adopting a plain embedding layer for each feature, which results in sub-optimal feature representations and thus inferior CTR prediction performance.

Click-Through Rate Prediction Contrastive Learning +3

Parameter-free Dynamic Graph Embedding for Link Prediction

1 code implementation15 Oct 2022 Jiahao Liu, Dongsheng Li, Hansu Gu, Tun Lu, Peng Zhang, Ning Gu

Dynamic interaction graphs have been widely adopted to model the evolution of user-item interactions over time.

Attribute Dynamic graph embedding +1

Enhancing CTR Prediction with Context-Aware Feature Representation Learning

1 code implementation19 Apr 2022 Fangye Wang, Yingxu Wang, Dongsheng Li, Hansu Gu, Tun Lu, Peng Zhang, Ning Gu

However, most methods only learn a fixed representation for each feature without considering the varying importance of each feature under different contexts, resulting in inferior performance.

Click-Through Rate Prediction Representation Learning

Do Smart Glasses Dream of Sentimental Visions? Deep Emotionship Analysis for Eyewear Devices

1 code implementation24 Jan 2022 Yingying Zhao, Yuhu Chang, Yutian Lu, Yujiang Wang, Mingzhi Dong, Qin Lv, Robert P. Dick, Fan Yang, Tun Lu, Ning Gu, Li Shang

Experimental studies with 20 participants demonstrate that, thanks to the emotionship awareness, EMOShip not only achieves superior emotion recognition accuracy over existing methods (80. 2% vs. 69. 4%), but also provides a valuable understanding of the cause of emotions.

Emotion Recognition

Joint Landmark and Structure Learning for Automatic Evaluation of Developmental Dysplasia of the Hip

no code implementations10 Jun 2021 Xindi Hu, LiMin Wang, Xin Yang, Xu Zhou, Wufeng Xue, Yan Cao, Shengfeng Liu, Yuhao Huang, Shuangping Guo, Ning Shang, Dong Ni, Ning Gu

In this study, we propose a multi-task framework to learn the relationships among landmarks and structures jointly and automatically evaluate DDH.

MemX: An Attention-Aware Smart Eyewear System for Personalized Moment Auto-capture

no code implementations3 May 2021 Yuhu Chang, Yingying Zhao, Mingzhi Dong, Yujiang Wang, Yutian Lu, Qin Lv, Robert P. Dick, Tun Lu, Ning Gu, Li Shang

MemX captures human visual attention on the fly, analyzes the salient visual content, and records moments of personal interest in the form of compact video snippets.

A Reinforcement-Learning-Based Energy-Efficient Framework for Multi-Task Video Analytics Pipeline

no code implementations9 Apr 2021 Yingying Zhao, Mingzhi Dong, Yujiang Wang, Da Feng, Qin Lv, Robert P. Dick, Dongsheng Li, Tun Lu, Ning Gu, Li Shang

By monitoring the impact of varying resolution on the quality of high-dimensional video analytics features, hence the accuracy of video analytics results, the proposed end-to-end optimization framework learns the best non-myopic policy for dynamically controlling the resolution of input video streams to globally optimize energy efficiency.

Instance Segmentation Optical Flow Estimation +4

Mixture-Rank Matrix Approximation for Collaborative Filtering

1 code implementation NeurIPS 2017 Dongsheng Li, Chao Chen, Wei Liu, Tun Lu, Ning Gu, Stephen Chu

However, our studies show that submatrices with different ranks could coexist in the same user-item rating matrix, so that approximations with fixed ranks cannot perfectly describe the internal structures of the rating matrix, therefore leading to inferior recommendation accuracy.

Collaborative Filtering

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