About

Thank you for visiting! I’m Long (*), a second-year CS Ph.D. student at the National University of Singapore (NUS), advised by Professors Kenji Kawaguchi, Kan Min Yen, Nancy Chen (NTU, A*STAR). My research focuses on efficient adaptation of large language and vision-language models:

• (1) Efficient LLM and LVLM alignment [Probe sampling (NeurIPS’24)].
• (2) Prompt understanding [FormatBias (preprint’24)], design [Multi-expert Prompting (EMNLP’24), Chain-of-Opinion (COLING’25)], and optimization [adv-ICL (ACL’24)].
• (3) Multi-agent system [Multi-expert Prompting (EMNLP’24)].
• (4) Vision-language [PromptChart (preprint’23), Unichart (EMNLP’23), OpenCQA (EMNLP’22), ChartQA (ACL’22)].

Previously, I received my B.Sc. in Mathematics (Statistics) and Computer Science at Nanyang Technological University, Singapore (NTU) advised by Prof. Shafiq Joty. At NTU, I won the SPMS Outstanding Undergraduate Award 2023 (Outstanding Achievement).

_{(*) my name means Dragon in Vietnamese context.}

_Education

• National University of Singapore (NUS), Doctor of Philosophy (Ph.D.) in Computer Science (Highest Distinction), Aug. 2023 - present

• Nanyang Technological University, Singapore (NTU), Bachelor of Science (B.Sc.) in Mathematical and Computer Sciences (Double major) (Honours, Highest Distinction), Aug. 2019 - Jul. 2023

_Preprints

_{(*) denotes equal contribution.}

1. LLMs Are Biased Towards Output Formats! Systematically Evaluating and Mitigating Output Format Bias of LLMs

_{Do Xuan Long, Hai Nguyen Ngoc, Tiviatis Sim, Hieu Dao, Shafiq Joty, Kenji Kawaguchi, Nancy Chen, Min-Yen Kan; Under review 2024.}

_Publications

(*) denotes equal contribution.

14. Aligning Large Language Models with Human Opinions through Persona Selection and Value–Belief–Norm Reasoning

_{Do Xuan Long, Kenji Kawaguchi, Min-Yen Kan, Nancy F. Chen; Proceedings of the 31st International Conference on Computational Linguistics (COLING 2025).}

13. Multi-expert Prompting Improves Safety, Reliability, and Usefulness of Large Language Models

_{Do Xuan Long, Yen Duong, Anh Tuan Luu, Kenji Kawaguchi, Min-Yen Kan, Nancy Chen; Proceedings of the 2024 Conference on Empirical Methods in Natural Language Processing (EMNLP 2024).}

_{Featured by elvis X, Huggingface, and other X, Reddit, Linkedin accounts.}

12. Prompt Optimization via Adversarial In-Context Learning

_{Do Xuan Long*, Yiran Zhao*, Hannah Brown*, Yuxi Xie, James Xu Zhao, Nancy F. Chen, Kenji Kawaguchi, Michael Qizhe Xie, Junxian He; Proceedings of the 62nd Annual Meeting of Association for Computational Lingustics (ACL 2024, Oral).}

11. Accelerating Greedy Coordinate Gradient and General Prompt Optimization via Probe Sampling

_{Yiran Zhao, Wenyue Zheng, Tianle Cai, Do Xuan Long, Kenji Kawaguchi, Anirudh Goyal, Michael Shieh; Proceedings of the Thirty-eighth Annual Conference on Neural Information Processing Systems (NeurIPS 2024).}

10. xCodeEval: A Large Scale Multilingual Multitask Benchmark for Code Understanding, Generation, Translation and Retrieval

_{Mohammad Abdullah Matin Khan*, M Saiful Bari*, Xuan Long Do, Weishi Wang, Md Rizwan Parvez, Shafiq Joty; Proceedings of the 62nd Annual Meeting of Association for Computational Lingustics (ACL 2024).}

9. ToXCL: A Unified Framework for Toxic Speech Detection and Explanation

_{Nhat M. Hoang*, Xuan Long Do*, Duc Anh Do, Duc Anh Vu, Anh Tuan Luu; Proceedings of the 2024 Annual Conference of the North American Chapter of the Association for Computational Linguistics (NAACL 2024).}

8. ChatGPT as a Math Questioner? Evaluating ChatGPT on Generating Pre-university Math Questions

_{Phuoc Pham Van Long*, Duc Anh Vu*, Nhat Minh Hoang*, Xuan Long Do*, Anh Tuan Luu; Proceedings of the 39th ACM/SIGAPP Symposium On Applied Computing, AI for Education Track (ACM/SIGAPP SAC 2024).}

7. UniChart: A Universal Vision-language Pretrained Model for Chart Comprehension and Reasoning

_{Ahmed Masry*, Parsa Kavehzadeh*, Xuan Long Do, Enamul Hoque, Shafiq Joty; Proceedings of the 2023 Conference on Empirical Methods in Natural Language Processing (EMNLP 2023).}

6. Retrieving Multimodal Information for Augmented Generation: A Survey

_{Ruochen Zhao, Hailin Chen, Weishi Wang, Fangkai Jiao, Xuan Long Do, Chengwei Qin, Bosheng Ding, Xiaobao Guo, Minzhi Li, Xingxuan Li, Shafiq Joty; Proceedings of Findings of 2023 Conference on Empirical Methods in Natural Language Processing (EMNLP 2023 Findings).}

5. Modeling What-to-ask and How-to-ask for Answer-unaware Conversational Question Generation

_{Xuan Long Do, Bowei Zou, Shafiq Joty, Anh Tai Tran, Liangming Pan, Nancy F. Chen, Ai Ti Aw; Proceedings of the 61st Annual Meeting of Association for Computational Lingustics (ACL 2023).}

4. CoHS-CQG: Context and History Selection for Conversational Question Generation

_{Xuan Long Do, Bowei Zou, Liangming Pan, Nancy F. Chen, Shafiq Joty, Ai Ti Aw; Proceedings of the 29th International Conference on Computational Lingustics (COLING 2022).}

3. OpenCQA: Open-ended Question Answering with Charts

_{Shankar Kantharaj, Xuan Long Do, Rixie Tiffany Leong, Jia Qing Tan, Enamul Hoque and Shafiq Joty; Proceedings of the 2022 Conference on Empirical Methods in Natural Language Processing (EMNLP 2022).}

2. ChartQA: A Benchmark for Question Answering about Charts with Visual and Logical Reasoning

_{Ahmed Masry, Do Xuan Long, Jia Qing Tan, Shafiq Joty, Enamul Hoque; Proceedings of Findings of 60th Annual Meeting of the Association for Computational Linguistics (ACL 2022 Findings).}

1. A Deep Learning Platform for Language Education Research and Development

_{Kye Min Tan, Richeng Duan, Xin Huang, Bowei Zou, Xuan Long Do; Proceedings of 2022 Conference of the International Speech Communication Association (INTERSPEECH 2022).}

_{Research Experiences}

• Natural Language Processing group at NTU (NTU-NLP), NTU President Research Scholar under FYP-URECA programme at NTU, advised by Prof. Shafiq Rayhan Joty, Jul. 2021 - Jul. 2023

• Institute for Infocomm Research, A*STAR, Singapore, NLP Research Intern, advised by Dr. Bowei Zou and Dr. Nancy F. Chen, Dec. 2021 - Jan. 2023

• Nanyang Technological University, Singapore, Research Assistant at NAIL, advised by Prof. Luu Anh Tuan, Aug. 2022 - Dec. 2022

• Eureka Robotics, Singapore, Computer Vision Intern under SGInnovate Summation Programme, supervised by Dr. Xu Zhang, May. 2021 - Aug. 2021

• Earth Observatory of Singapore, Research Assistant, advised by Dr. Christina WIDIWIJAYANTI, Aug. 2020 - May. 2021

• Panasonic R&D Center, Singapore, Video Algorithm Research Intern, advised by Han Boon Teo, Jun. 2020 - Aug. 2020

_Teaching

• National University of Singapore, Teaching Assistant (SoC, NUS), Jan. 2024 - present
  • AY23-24 Sem 2: CS3244 Machine Learning.
• Nanyang Technological University, Singapore, Teaching Assistant (SPMS, NTU), Aug. 2022 - May. 2023
  • AY22-23 Sem 2: MH3500: Statistics, PS0002: Introduction to Data Science and Artificial Intelligence.
  • AY22-23 Sem 1: PS0001: Introduction to Computational Thinking.

_Awards

• Undergraduate Awards
  • SPMS Outstanding Undergraduate Award 2023 (Outstanding Achievement)
  • A*STAR Computing and Information Science (ACIS) Scholarship, 2023-2027
  • NTU President Research Scholar, 2022
  • ACM-ICPC Jakarta Regional Contest 2021, 2022, team NTUDragons & WCRush, ICPCID
  • Second Place Award, ISC 2021 Student Cluster Competition
  • Second Prize, International Mathematics Competition for University Students 2020 (IMC)
  • Dean’s List AY2019-2020, School of Computer Science and Engineering (SCSE), NTU
• High-school Awards
  • Gold Medal, Iranian Geometry Olympiad 2018, Open Section (IGO)
  • Honorable Prize, Vietnamese Mathematical Olympiads 2018 (VMO)

_{Services & Volunteers}

• Professional Membership:
  • Association for Computational Linguistics (ACL) Member, May 2021 - present
  • Association for Computing Machinery (ACM) Member Dec. 2023 - present
• Program Committee/Reviewer:
  • Journals: IEEE/ACM TASLP (2023, 2022).
  • Conferences: ICLR (2024), EMNLP (2024), ACL RR (2024, 2023, 2022), COLING (2022).
• Student Volunteer Award:
  • ACL (2024, 2023, 2022), EMNLP (2022).

_{Media Coverage}

• Congratulations to all SPMS Outstanding Undergraduate Award Winners 2023 - 2nd url.
• NTU team came in 2nd Overall in the ISC21 Student Cluster Competition.
• SPMS Students Win Awards in IMC 2020.