Search Results for author: Yun Xiong

Found 36 papers, 23 papers with code

A 2D Semantic-Aware Position Encoding for Vision Transformers

no code implementations14 May 2025 Xi Chen, Shiyang Zhou, Muqi Huang, Jiaxu Feng, Yun Xiong, Kun Zhou, Biao Yang, Yuhui Zhang, Huishuai Bao, Sijia Peng, Chuan Li, Feng Shi

Traditional approaches like absolute position encoding and relative position encoding primarily focus on 1D linear position relationship, often neglecting the semantic similarity between distant yet contextually related patches.

Position Semantic Similarity +2

Rethinking Time Encoding via Learnable Transformation Functions

1 code implementation1 May 2025 Xi Chen, Yateng Tang, Jiarong Xu, Jiawei Zhang, Siwei Zhang, Sijia Peng, Xuehao Zheng, Yun Xiong

While previous methods focus on capturing time patterns, many rely on specific inductive biases, such as using trigonometric functions to model periodicity.

Diversity

Synergizing RAG and Reasoning: A Systematic Review

no code implementations22 Apr 2025 Yunfan Gao, Yun Xiong, Yijie Zhong, Yuxi Bi, Ming Xue, Haofen Wang

Recent breakthroughs in large language models (LLMs), particularly in reasoning capabilities, have propelled Retrieval-Augmented Generation (RAG) to unprecedented levels.

RAG Retrieval +1

Unifying Text Semantics and Graph Structures for Temporal Text-attributed Graphs with Large Language Models

no code implementations18 Mar 2025 Siwei Zhang, Yun Xiong, Yateng Tang, Xi Chen, Zian Jia, Zehao Gu, Jiarong Xu, Jiawei Zhang

Existing TGNNs embed texts statically and rely heavily on encoding mechanisms that biasedly prioritize structural information, overlooking the temporal evolution of text semantics and the essential interplay between semantics and structures for synergistic reinforcement.

Link Prediction Node Classification

U-NIAH: Unified RAG and LLM Evaluation for Long Context Needle-In-A-Haystack

1 code implementation1 Mar 2025 Yunfan Gao, Yun Xiong, Wenlong Wu, Zijing Huang, Bohan Li, Haofen Wang

Recent advancements in Large Language Models (LLMs) have expanded their context windows to unprecedented lengths, sparking debates about the necessity of Retrieval-Augmented Generation (RAG).

Hallucination RAG +2

Enhancing Masked Time-Series Modeling via Dropping Patches

1 code implementation19 Dec 2024 Tianyu Qiu, Yi Xie, Yun Xiong, Hao Niu, Xiaofeng Gao

This paper explores how to enhance existing masked time-series modeling by randomly dropping sub-sequence level patches of time series.

cross-domain few-shot learning Data Augmentation +1

An Efficient and Generalizable Symbolic Regression Method for Time Series Analysis

no code implementations6 Sep 2024 Yi Xie, Tianyu Qiu, Yun Xiong, Xiuqi Huang, Xiaofeng Gao, Chao Chen

Time series analysis and prediction methods currently excel in quantitative analysis, offering accurate future predictions and diverse statistical indicators, but generally falling short in elucidating the underlying evolution patterns of time series.

Computational Efficiency regression +3

Mamba or Transformer for Time Series Forecasting? Mixture of Universals (MoU) Is All You Need

1 code implementation28 Aug 2024 Sijia Peng, Yun Xiong, Yangyong Zhu, Zhiqiang Shen

To address these challenges, we introduce Mixture of Universals (MoU), a versatile model to capture both short-term and long-term dependencies for enhancing performance in time series forecasting.

All Mamba +2

DTFormer: A Transformer-Based Method for Discrete-Time Dynamic Graph Representation Learning

no code implementations26 Jul 2024 Xi Chen, Yun Xiong, Siwei Zhang, Jiawei Zhang, Yao Zhang, Shiyang Zhou, Xixi Wu, Mingyang Zhang, Tengfei Liu, Weiqiang Wang

Discrete-Time Dynamic Graphs (DTDGs), which are prevalent in real-world implementations and notable for their ease of data acquisition, have garnered considerable attention from both academic researchers and industry practitioners.

Graph Representation Learning

Modular RAG: Transforming RAG Systems into LEGO-like Reconfigurable Frameworks

no code implementations26 Jul 2024 Yunfan Gao, Yun Xiong, Meng Wang, Haofen Wang

Retrieval-augmented Generation (RAG) has markedly enhanced the capabilities of Large Language Models (LLMs) in tackling knowledge-intensive tasks.

RAG Retrieval-augmented Generation +1

Towards Adaptive Neighborhood for Advancing Temporal Interaction Graph Modeling

no code implementations14 Jun 2024 Siwei Zhang, Xi Chen, Yun Xiong, Xixi Wu, Yao Zhang, Yongrui Fu, Yinglong Zhao, Jiawei Zhang

These works can generate temporal node representations by encoding the surrounding neighborhoods for the target node.

Finetuning Large Language Model for Personalized Ranking

1 code implementation25 May 2024 Zhuoxi Bai, Ning Wu, Fengyu Cai, Xinyi Zhu, Yun Xiong

Large Language Models (LLMs) have demonstrated remarkable performance across various domains, motivating researchers to investigate their potential use in recommendation systems.

Explainable Recommendation Language Modeling +4

Beyond the Known: Novel Class Discovery for Open-world Graph Learning

no code implementations29 Mar 2024 Yucheng Jin, Yun Xiong, Juncheng Fang, Xixi Wu, Dongxiao He, Xing Jia, Bingchen Zhao, Philip Yu

Inter-class correlations are subsequently eliminated by the prototypical attention network, leading to distinctive representations for different classes.

Graph Learning Graph Neural Network +2

DiffPoint: Single and Multi-view Point Cloud Reconstruction with ViT Based Diffusion Model

no code implementations17 Feb 2024 Yu Feng, Xing Shi, Mengli Cheng, Yun Xiong

As the task of 2D-to-3D reconstruction has gained significant attention in various real-world scenarios, it becomes crucial to be able to generate high-quality point clouds.

Point cloud reconstruction

Prompt Learning on Temporal Interaction Graphs

1 code implementation9 Feb 2024 Xi Chen, Siwei Zhang, Yun Xiong, Xixi Wu, Jiawei Zhang, Xiangguo Sun, Yao Zhang, Feng Zhao, Yulin kang

In detail, we propose a temporal prompt generator to offer temporally-aware prompts for different tasks.

Prompt Learning Representation Learning

Retrieval-Augmented Generation for Large Language Models: A Survey

4 code implementations18 Dec 2023 Yunfan Gao, Yun Xiong, Xinyu Gao, Kangxiang Jia, Jinliu Pan, Yuxi Bi, Yi Dai, Jiawei Sun, Meng Wang, Haofen Wang

Large Language Models (LLMs) showcase impressive capabilities but encounter challenges like hallucination, outdated knowledge, and non-transparent, untraceable reasoning processes.

Hallucination RAG +3

Graph Prompt Learning: A Comprehensive Survey and Beyond

3 code implementations28 Nov 2023 Xiangguo Sun, Jiawen Zhang, Xixi Wu, Hong Cheng, Yun Xiong, Jia Li

This paper presents a pioneering survey on the emerging domain of graph prompts in AGI, addressing key challenges and opportunities in harnessing graph data for AGI applications.

Prompt Learning Survey

Joint Learning of Local and Global Features for Aspect-based Sentiment Classification

no code implementations2 Nov 2023 Hao Niu, Yun Xiong, Xiaosu Wang, Philip S. Yu

Furthermore, we propose a dual-level graph attention network as a global encoder by fully employing dependency tag information to capture long-distance information effectively.

Graph Attention Representation Learning +4

iLoRE: Dynamic Graph Representation with Instant Long-term Modeling and Re-occurrence Preservation

no code implementations5 Sep 2023 Siwei Zhang, Yun Xiong, Yao Zhang, Xixi Wu, Yiheng Sun, Jiawei Zhang

To overcome the indiscriminate updating issue, we introduce the Adaptive Short-term Updater module that will automatically discard the useless or noisy edges, ensuring iLoRE's effectiveness and instant ability.

Fraud Detection Representation Learning

RDGSL: Dynamic Graph Representation Learning with Structure Learning

1 code implementation5 Sep 2023 Siwei Zhang, Yun Xiong, Yao Zhang, Yiheng Sun, Xi Chen, Yizhu Jiao, Yangyong Zhu

To address the noise dynamics issue, we introduce the Dynamic Graph Filter, where we innovatively propose a dynamic noise function that dynamically captures both current and historical noise, enabling us to assess the temporal aspect of noise and generate a denoised graph.

Graph Representation Learning Graph structure learning

SPEED: Streaming Partition and Parallel Acceleration for Temporal Interaction Graph Embedding

1 code implementation27 Aug 2023 Xi Chen, Yongxiang Liao, Yun Xiong, Yao Zhang, Siwei Zhang, Jiawei Zhang, Yiheng Sun

Simultaneously, resource consumption of a single-GPU can be diminished by up to 69%, thus enabling the multiple GPU-based training and acceleration encompassing millions of nodes and billions of edges.

Graph Embedding

Dual Intents Graph Modeling for User-centric Group Discovery

1 code implementation9 Aug 2023 Xixi Wu, Yun Xiong, Yao Zhang, Yizhu Jiao, Jiawei Zhang

Therefore, user-centric group discovery task, i. e., recommending groups to users can help both users' online experiences and platforms' long-term developments.

Representation Learning Self-Supervised Learning

Chat-REC: Towards Interactive and Explainable LLMs-Augmented Recommender System

no code implementations25 Mar 2023 Yunfan Gao, Tao Sheng, Youlin Xiang, Yun Xiong, Haofen Wang, Jiawei Zhang

Large language models (LLMs) have demonstrated their significant potential to be applied for addressing various application tasks.

In-Context Learning Recommendation Systems

TIGER: Temporal Interaction Graph Embedding with Restarts

1 code implementation13 Feb 2023 Yao Zhang, Yun Xiong, Yongxiang Liao, Yiheng Sun, Yucheng Jin, Xuehao Zheng, Yangyong Zhu

However, due to the entangled temporal and structural dependencies, existing methods have to process the sequence of events chronologically and consecutively to ensure node representations are up-to-date.

Graph Embedding

ConsRec: Learning Consensus Behind Interactions for Group Recommendation

1 code implementation7 Feb 2023 Xixi Wu, Yun Xiong, Yao Zhang, Yizhu Jiao, Jiawei Zhang, Yangyong Zhu, Philip S. Yu

Since group activities have become very common in daily life, there is an urgent demand for generating recommendations for a group of users, referred to as group recommendation task.

MULTI-VIEW LEARNING

RuDi: Explaining Behavior Sequence Models by Automatic Statistics Generation and Rule Distillation

1 code implementation12 Aug 2022 Yao Zhang, Yun Xiong, Yiheng Sun, Caihua Shan, Tian Lu, Hui Song, Yangyong Zhu

We propose a two-stage method, RuDi, that distills the knowledge of black-box teacher models into rule-based student models.

Fairness

ReCo: A Dataset for Residential Community Layout Planning

1 code implementation8 Jun 2022 Xi Chen, Yun Xiong, Siqi Wang, Haofen Wang, Tao Sheng, Yao Zhang, Yu Ye

In order to address the issues and advance a benchmark dataset for various intelligent spatial design and analysis applications in the development of smart city, we introduce Residential Community Layout Planning (ReCo) Dataset, which is the first and largest open-source vector dataset related to real-world community to date.

Generative Adversarial Network Layout Design +1

Continuous-Time Sequential Recommendation with Temporal Graph Collaborative Transformer

1 code implementation14 Aug 2021 Ziwei Fan, Zhiwei Liu, Jiawei Zhang, Yun Xiong, Lei Zheng, Philip S. Yu

Therefore, we propose to unify sequential patterns and temporal collaborative signals to improve the quality of recommendation, which is rather challenging.

Sequential Recommendation

Sub-graph Contrast for Scalable Self-Supervised Graph Representation Learning

3 code implementations22 Sep 2020 Yizhu Jiao, Yun Xiong, Jiawei Zhang, Yao Zhang, Tianqi Zhang, Yangyong Zhu

Instead of learning on the complete input graph data, with a novel data augmentation strategy, \textsc{Subg-Con} learns node representations through a contrastive loss defined based on subgraphs sampled from the original graph instead.

Data Augmentation Graph Representation Learning +2

ISTD-GCN: Iterative Spatial-Temporal Diffusion Graph Convolutional Network for Traffic Speed Forecasting

no code implementations10 Aug 2020 Yi Xie, Yun Xiong, Yangyong Zhu

Most of the existing algorithms for traffic speed forecasting split spatial features and temporal features to independent modules, and then associate information from both dimensions.

Social and Information Networks

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