👋 I am currently pursuing an M.S. in Computer Science at Northeastern University. My research interests include NLP, information retrieval, Retrieval-Augmented Generation, recommender systems, and multi-agent systems. You can find my Google Scholar profile here .

🎓 I received my B.S. in Computer Science from Harbin Engineering University. I am now a master’s student at NEUIR Lab, advised by Associate Professor Zhenghao Liu. I also collaborate closely with Qiyuan Lab , ModelBest , and TsinghuaNLP , and am mentored by Associate Researcher Yukun Yan.

🔥 EdgeClaw 2.0 is officially open-sourced — an Edge-Cloud Collaborative AI Agent built on OpenClaw.

🔥 UltraRAG 3.0 is officially open-sourced — a Low-Code MCP Framework for Building Complex and Innovative RAG Pipelines.

Page Views: · Last Updated: 2026-04-10 · hdxin2002@gmail.com

🔥 News

2026.04: 🎉 Our paper MetaMem has been accepted at ACL 2026 (CCF-A)!
2026.04: 🎉 We released EdgeClaw 2.0 , an Edge-Cloud Collaborative AI Agent!
2026.02: 🎉 Our paper Knowledge Intensive Agents has been accepted by AI Open (IF=14.8)!
2026.01: 🎉 UltraRAG v3 reached #2 on GitHub Trending!
2026.01: 🎉 We released UltraRAG v3, making every step of the reasoning workflow visible!
2025.11: 🎉 Our paper LISRec has been accepted at KDD 2026 (CCF-A)!
2025.11: 🎉 We released UltraRAG v2.1 with multimodal support and a more unified evaluation pipeline!
2025.08: 🎉 We released UltraRAG v2, a low-code framework for building complex RAG systems!
2025.08: 🎉 Our paper TASTE$^+$ has been accepted at WISA 2025 (CCF-C) and selected for an oral presentation!
2025.08: 🎉 Our paper LLMsPark has been accepted at EMNLP 2025 (CCF-B)!
2024.04: 🎉 We released heu-icicles , an HEU course guide and resource-sharing platform.
2024.02: 🎉 Our paper MMAD has been accepted at COLING 2024 (CCF-B)!
2023.05: 🎉 Our paper received an Honorable Mention at MCM/ICM 2023!

📝 Publications

* indicates equal contribution, and † indicates corresponding author.

ACL 2026

MetaMem: Evolving Meta-Memory for Knowledge Utilization through Self-Reflective Symbolic Optimization

Haidong Xin$^{*}$, Xinze Li$^{*}$, Zhenghao Liu$^†$, Yukun Yan$^†$, Shuo Wang, Cheng Yang, Yu Gu, Ge Yu, Maosong Sun

This work proposes MetaMem, a meta-memory framework that evolves meta-memory through self-reflective symbolic optimization, enabling knowledge utilization in long-horizon human-LLM interactions.

KDD 2026

LISRec: Modeling User Preferences with Learned Item Shortcuts for Sequential Recommendation

Haidong Xin, Zhenghao Liu$^†$, Sen Mei, Yukun Yan, Shi Yu, Shuo Wang, Zulong Chen, Yu Gu, Ge Yu, Chenyan Xiong

This work improves sequential recommendation systems by extracting personalized semantic shortcuts from user-item interaction histories, enhancing the capture of stable user preferences.

AI Open

Knowledge Intensive Agents

Zhenghao Liu, Pengcheng Huang, Zhipeng Xu, Xinze Li, Shuliang Liu, Chunyi Peng, Haidong Xin, Yukun Yan$^†$, Shuo Wang, Xu Han, Zhiyuan Liu$^†$, Maosong Sun$^†$, Yu Gu, Ge Yu

This work provides a comprehensive overview of Retrieval-Augmented Generation from an agentic perspective, categorizing knowledge-intensive agents into acquisition and utilization roles, and highlighting future directions for joint optimization in multi-agent RAG systems.

WISA 2025

Adapting Language Models to Text Matching based Recommendation Systems

Haidong Xin, Sen Mei, Zhenghao Liu$^†$, Xiaohua Li, Minghe Yu, Yu Gu, Ge Yu

This work has significantly improved the performance of text matching in recommendation systems by incorporating language model pretraining.

EMNLP 2025

LLMsPark: A Benchmark for Evaluating Large Language Models in Strategic Gaming Contexts

Junhao Chen, Jingbo Sun, Xiang Li, Haidong Xin, Yuhao Xue, Yibin Xu, Hao Zhao$^†$

This work introduces LLMsPark, a game theory-based platform for evaluating large language models’ strategic behaviors and decision-making abilities in multi-agent environments, providing a novel criterion for assessing their intelligence.

COLING 2024

Xiaojun Ye, Junhao Chen, Xiang Li, Haidong Xin, Chao Li, Sheng Zhou$^†$, Jiajun Bu

This work has unlocked a whole new experience of watching movies for the visually impaired.

ArXiv 2026

Structured Knowledge Representation through Contextual Pages for Retrieval-Augmented Generation

Xinze Li, Zhenghao Liu$^†$, Haidong Xin, Yukun Yan$^†$, Shuo Wang, Zheni Zeng, Sen Mei, Ge Yu, Maosong Sun

This work enhances RAG systems by constructing structured cognitive outlines to guide iterative retrieval, effectively organizing multi-dimensional knowledge into coherent pages for more accurate answer generation.

ArXiv 2026

Minghai Jiao, Jing Xiao$^†$, Peng Xiao, Ende Zhang, Shuang Kan, Wenyan Jiang, Jinyao Li, Yixian Liu, Haidong Xin

This work improves multimodal sentiment analysis by introducing a context-aware gated Mamba framework that models dialogue-level sentiment evolution and adaptively balances cross-modal fusion with modality-specific information.

MCM/ICM 2023

Puzzle Game: Prediction and Classification of Wordle Solution Words

Haidong Xin$^{*†}$, Fang Wu$^{*}$, Zhitong Zhou$^{*}$

This work conducted a detailed numerical analysis of the Wordle game, revealing statistical patterns within it.

🏆 Awards

2025.11 🥇 First-Class Excellent Student Scholarship.
2024.11 🥇 First-Class Excellent Student Scholarship.
2023.07 🥈 National Second Prize, Chinese Collegiate Computing Competition (4C 2023).
2023.05 🥈 Honorable Mention, Mathematical Contest in Modeling (MCM/ICM 2023).
2023.05 🥈 Second Prize, China International College Students’ Innovation Competition.
2022.11 🥇 First Prize, China Undergraduate Mathematical Contest in Modeling (CUMCM 2022).
2022.10 🥈 Second Prize, Mathematical Modeling Competition of the Three Northeastern Provinces.
2022.05 🥇 First-Class Excellent Student Scholarship.
2021.05 🥇 First-Class Excellent Student Scholarship.

📖 Education

2024.09 - present, M.S. in Computer Science, School of Computer Science and Engineering, Northeastern University
2020.09 - 2024.06, B.S. in Computer Science, College of Computer Science and Technology, Harbin Engineering University
2017.09 - 2020.06, Yichun No. 1 Middle School

💬 Media Mentions

💻 Research and Internships

2024.04 - present, Qiyuan Lab (TsinghuaNLP), Beijing.
2024.10 - 2025.02, Language Technologies Institute (LTI), Carnegie Mellon University, Remote.
2023.10 - present, NEUIR Lab, Northeastern University, Shenyang.
2023.05 - 2023.06, China Unicom Research Centre, Harbin.
2023.07 - 2023.08, Workforce Development Program (WDP) of Oracle, Harbin.
2022.09 - 2024.06, E-Government Modeling Simulation National Engineering Laboratory, Harbin.

Haidong Xin