publications

2025

1. EMNLP

   Don’t Forget the Base Retriever! A Low-Resource Graph-based Retriever for Multi-hop Question Answering

   André Melo, Enting Chen, Pavlos Vougiouklis, and 4 more authors

   In Proceedings of the 2025 Conference on Empirical Methods in Natural Language Processing: Industry Track, 2025

   DOI Bib Poster

   @inproceedings{melo2025don,
     title = {Don’t Forget the Base Retriever! A Low-Resource Graph-based Retriever for Multi-hop Question Answering},
     author = {Melo, Andr{\'e} and Chen, Enting and Vougiouklis, Pavlos and Diao, Chenxin and Piramanayagam, Shriram and Lai, Ruofei and Pan, Jeff Z},
     booktitle = {Proceedings of the 2025 Conference on Empirical Methods in Natural Language Processing: Industry Track},
     pages = {2564--2572},
     year = {2025},
     doi = {10.18653/v1/2025.emnlp-industry.174},
     google_scholar_id_no_citation = {W7OEmFMy1HYC}
   }

2. Preprint

   HRIPBench: Benchmarking LLMs in Harm Reduction Information Provision to Support People Who Use Drugs

   Kaixuan Wang, Chenxin Diao, Jason T Jacques, and 2 more authors

   arXiv preprint arXiv:2507.21815, 2025

   arXiv Bib Dataset

   @article{wang2025hripbench,
     title = {HRIPBench: Benchmarking LLMs in Harm Reduction Information Provision to Support People Who Use Drugs},
     author = {Wang, Kaixuan and Diao, Chenxin and Jacques, Jason T and Guo, Zhongliang and Zhao, Shuai},
     journal = {arXiv preprint arXiv:2507.21815},
     year = {2025},
     google_scholar_id_no_citation = {Tyk-4Ss8FVUC},
     dataset = {https://huggingface.co/datasets/RayK/Harm_Reduction_QA_dataset_basic}
   }

3. ACL Findings

   

   GeAR: Graph-enhanced Agent for Retrieval-augmented Generation

   Zhili Shen^†, Chenxin Diao^†, Pavlos Vougiouklis^†, and 8 more authors

   In The 63rd Annual Meeting of the Association for Computational Linguistics (ACL 2025), 2025

   DOI arXiv Bib Blog Poster

   @inproceedings{shen2025gear,
     title = {GeAR: Graph-enhanced Agent for Retrieval-augmented Generation},
     author = {Shen, Zhili and Diao, Chenxin and Vougiouklis, Pavlos and Merita, Pascual and Piramanayagam, Shriram and Graux, Damien and Tu, Dandan and Jiang, Zeren and Lai, Ruofei and Ren, Yang and others},
     booktitle = {The 63rd Annual Meeting of the Association for Computational Linguistics (ACL 2025)},
     pages = {12049--12072},
     year = {2025},
     google_scholar_id_no_citation = {2osOgNQ5qMEC},
     doi = {10.18653/v1/2025.findings-acl.624},
   }

4. Workshop

   Millions of $GeAR$ -s: Extending GraphRAG to Millions of Documents

   Zhili Shen, Chenxin Diao, Pascual Merita, and 2 more authors

   In LiveRAG Challenge in the 48th International ACM SIGIR Conference on Research and Development in Information Retrieval, 2025

   arXiv Bib

   @inproceedings{shen2025millions,
     title = {Millions of $$GeAR$$ -s: Extending GraphRAG to Millions of Documents},
     author = {Shen, Zhili and Diao, Chenxin and Merita, Pascual and Vougiouklis, Pavlos and Pan, Jeff Z},
     booktitle = {LiveRAG Challenge in the 48th International ACM SIGIR Conference on Research and Development in Information Retrieval},
     year = {2025},
     google_scholar_id_no_citation = {zYLM7Y9cAGgC},
   }

5. Workshop

   LifeSearch: Multimodal Lifelog Search System for LSC’25

   Shriram Piramanayagam, Enting Chen, Andre Melo, and 6 more authors

   In Proceedings of the 8th Annual ACM Workshop on the Lifelog Search Challenge, 2025

   Abs DOI Bib

   We introduce LifeSearch, a novel multimodal retrieval system developed for the Lifelog Search Challenge 2025 (LSC’25). Our proposed solution can query images across visual, spatial, and temporal domains. Central to our approach are spatial and temporal augmentation techniques, along with a time-constrained scoring mechanism. By integrating these methods with a hybrid retrieval strategy, LifeSearch improves the retrieval process, allowing users to execute complex lifelog queries and obtain highly relevant results.

   @inproceedings{piramanayagam2025lifesearch,
     author = {Piramanayagam, Shriram and Chen, Enting and Melo, Andre and Vougiouklis, Pavlos and Diao, Chenxin and Merita, Pascual and Jiang, Zeren and Lai, Ruofei and Pan, Jeff Z.},
     title = {LifeSearch: Multimodal Lifelog Search System for LSC'25},
     year = {2025},
     isbn = {9798400718571},
     publisher = {Association for Computing Machinery},
     address = {New York, NY, USA},
     url = {https://doi.org/10.1145/3729459.3748696},
     doi = {10.1145/3729459.3748696},
     booktitle = {Proceedings of the 8th Annual ACM Workshop on the Lifelog Search Challenge},
     pages = {28–33},
     numpages = {6},
     keywords = {Lifelogging, Lifelog Search Challenge, Multimodal Retrieval},
     series = {LSC '25},
     google_scholar_id_no_citation = {Y0pCki6q_DkC}
   }

6. Preprint

   Positioning AI Tools to Support Online Harm Reduction Practice: Applications and Design Directions

   Kaixuan Wang, Jason T Jacques, Chenxin Diao, and 1 more author

   arXiv preprint arXiv:2506.22941, 2025

   arXiv Bib

   @article{wang2025positioning,
     title = {Positioning AI Tools to Support Online Harm Reduction Practice: Applications and Design Directions},
     author = {Wang, Kaixuan and Jacques, Jason T and Diao, Chenxin and Dreue, Carl-Cyril J},
     journal = {arXiv preprint arXiv:2506.22941},
     google_scholar_id_no_citation = {IjCSPb-OGe4C},
     year = {2025}
   }

2024

1. ICLR

   From an LLM Swarm to a PDDL-empowered Hive: Planning Self-executed Instructions in a Multi-modal Jungle

   Kaustubh Vyas, Damien Graux, Yijun Yang, and 8 more authors

   In The Thirteenth International Conference on Learning Representations (ICLR) 2025, 2024

   arXiv Bib Supp Demo Poster OpenReview

   @inproceedings{vyas2024llm,
     title = {From an LLM Swarm to a PDDL-empowered Hive: Planning Self-executed Instructions in a Multi-modal Jungle},
     author = {Vyas, Kaustubh and Graux, Damien and Yang, Yijun and Montella, S{\'e}bastien and Diao, Chenxin and Zhou, Wendi and Vougiouklis, Pavlos and Lai, Ruofei and Ren, Yang and Li, Keshuang and others},
     booktitle = {The Thirteenth International Conference on Learning Representations (ICLR) 2025},
     year = {2024},
     openreview_id = {QAAsnSRwgu},
     google_scholar_id_no_citation = {9yKSN-GCB0IC},
     demo = {https://drive.google.com/file/d/1weig7tDjEGB3NC3rkwcACeHDu-XjAgXJ/view},
   }

2. EMNLP

   

   Improving Retrieval-augmented Text-to-SQL with AST-based Ranking and Schema Pruning

   Zhili Shen^†, Pavlos Vougiouklis^†, Chenxin Diao^†, and 3 more authors

   In Proceedings of the 2024 Conference on Empirical Methods in Natural Language Processing, 2024

   DOI arXiv Bib Video Poster Slides

   @inproceedings{shen2024improving,
     title = {Improving Retrieval-augmented Text-to-{SQL} with {AST}-based Ranking and Schema Pruning},
     author = {Shen, Zhili and Vougiouklis, Pavlos and Diao, Chenxin and Vyas, Kaustubh and Ji, Yuanyi and Pan, Jeff Z.},
     editor = {Al-Onaizan, Yaser and Bansal, Mohit and Chen, Yun-Nung},
     booktitle = {Proceedings of the 2024 Conference on Empirical Methods in Natural Language Processing},
     year = {2024},
     address = {Miami, Florida, USA},
     publisher = {Association for Computational Linguistics},
     url = {https://aclanthology.org/2024.emnlp-main.449/},
     doi = {10.18653/v1/2024.emnlp-main.449},
     pages = {7865--7879},
     google_scholar_id_no_citation = {d1gkVwhDpl0C},
   }

2023

1. AACL

   FastRAT: Fast and Efficient Cross-lingual Text-to-SQL Semantic Parsing

   Pavlos Vougiouklis, Nikos Papasarantopoulos, Danna Zheng, and 4 more authors

   In Proceedings of the 13th International Joint Conference on Natural Language Processing and the 3rd Conference of the Asia-Pacific Chapter of the Association for Computational Linguistics (Volume 1: Long Papers), 2023

   DOI Bib

   @inproceedings{vougiouklis2023fastrat,
     title = {{F}ast{RAT}: Fast and Efficient Cross-lingual Text-to-{SQL} Semantic Parsing},
     author = {Vougiouklis, Pavlos and Papasarantopoulos, Nikos and Zheng, Danna and Tuckey, David and Diao, Chenxin and Shen, Zhili and Pan, Jeff},
     editor = {Park, Jong C. and Arase, Yuki and Hu, Baotian and Lu, Wei and Wijaya, Derry and Purwarianti, Ayu and Krisnadhi, Adila Alfa},
     booktitle = {Proceedings of the 13th International Joint Conference on Natural Language Processing and the 3rd Conference of the Asia-Pacific Chapter of the Association for Computational Linguistics (Volume 1: Long Papers)},
     year = {2023},
     address = {Nusa Dua, Bali},
     publisher = {Association for Computational Linguistics},
     url = {https://aclanthology.org/2023.ijcnlp-main.38/},
     doi = {10.18653/v1/2023.ijcnlp-main.38},
     pages = {564--576},
     google_scholar_id_no_citation = {u5HHmVD_uO8C}
   }