Chengwei Wei


2025

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Crowdsource, Crawl, or Generate? Creating SEA-VL, a Multicultural Vision-Language Dataset for Southeast Asia
Samuel Cahyawijaya | Holy Lovenia | Joel Ruben Antony Moniz | Tack Hwa Wong | Mohammad Rifqi Farhansyah | Thant Thiri Maung | Frederikus Hudi | David Anugraha | Muhammad Ravi Shulthan Habibi | Muhammad Reza Qorib | Amit Agarwal | Joseph Marvin Imperial | Hitesh Laxmichand Patel | Vicky Feliren | Bahrul Ilmi Nasution | Manuel Antonio Rufino | Genta Indra Winata | Rian Adam Rajagede | Carlos Rafael Catalan | Mohamed Fazli Mohamed Imam | Priyaranjan Pattnayak | Salsabila Zahirah Pranida | Kevin Pratama | Yeshil Bangera | Adisai Na-Thalang | Patricia Nicole Monderin | Yueqi Song | Christian Simon | Lynnette Hui Xian Ng | Richardy Lobo Sapan | Taki Hasan Rafi | Bin Wang | Supryadi | Kanyakorn Veerakanjana | Piyalitt Ittichaiwong | Matthew Theodore Roque | Karissa Vincentio | Takdanai Kreangphet | Phakphum Artkaew | Kadek Hendrawan Palgunadi | Yanzhi Yu | Rochana Prih Hastuti | William Nixon | Mithil Bangera | Adrian Xuan Wei Lim | Aye Hninn Khine | Hanif Muhammad Zhafran | Teddy Ferdinan | Audra Aurora Izzani | Ayushman Singh | Evan Evan | Jauza Akbar Krito | Michael Anugraha | Fenal Ashokbhai Ilasariya | Haochen Li | John Amadeo Daniswara | Filbert Aurelian Tjiaranata | Eryawan Presma Yulianrifat | Can Udomcharoenchaikit | Fadil Risdian Ansori | Mahardika Krisna Ihsani | Giang Nguyen | Anab Maulana Barik | Dan John Velasco | Rifo Ahmad Genadi | Saptarshi Saha | Chengwei Wei | Isaiah Edri W. Flores | Kenneth Chen Ko Han | Anjela Gail D. Santos | Wan Shen Lim | Kaung Si Phyo | Tim Santos | Meisyarah Dwiastuti | Jiayun Luo | Jan Christian Blaise Cruz | Ming Shan Hee | Ikhlasul Akmal Hanif | M.Alif Al Hakim | Muhammad Rizky Sya’ban | Kun Kerdthaisong | Lester James Validad Miranda | Fajri Koto | Tirana Noor Fatyanosa | Alham Fikri Aji | Jostin Jerico Rosal | Jun Kevin | Robert Wijaya | Onno P. Kampman | Ruochen Zhang | Börje F. Karlsson | Peerat Limkonchotiwat
Proceedings of the 63rd Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)

Despite Southeast Asia’s (SEA) extraordinary linguistic and cultural diversity, the region remains significantly underrepresented in vision-language (VL) research, resulting in AI models that inadequately capture SEA cultural nuances. To fill this gap, we present SEA-VL, an open-source initiative dedicated to developing culturally relevant high-quality datasets for SEA languages. By involving contributors from SEA countries, SEA-VL ensures better cultural relevance and diversity, fostering greater inclusivity of underrepresented languages and cultural depictions in VL research. Our methodology employed three approaches: community-driven crowdsourcing with SEA contributors, automated image crawling, and synthetic image generation. We evaluated each method’s effectiveness in capturing cultural relevance. We found that image crawling achieves approximately ~85% cultural relevance while being more cost- and time-efficient than crowdsourcing, whereas synthetic image generation failed to accurately reflect SEA cultural nuances and contexts. Collectively, we gathered 1.28 million SEA culturally relevant images, more than 50 times larger than other existing datasets. This work bridges the representation gap in SEA, establishes a foundation for developing culturally aware AI systems for this region, and provides a replicable framework for addressing representation gaps in other underrepresented regions.

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CoinMath: Harnessing the Power of Coding Instruction for Math LLM
Chengwei Wei | Bin Wang | Jung-jae Kim | Guimei Liu | Nancy F. Chen
Findings of the Association for Computational Linguistics: ACL 2025

Large Language Models (LLMs) have shown strong performance in solving mathematical problems, with code-based solutions proving particularly effective. However, the best practice to leverage coding instruction data to enhance mathematical reasoning remains underexplored. This study investigates three key questions: (1) How do different coding styles of mathematical code-based rationales impact LLMs’ learning performance? (2) Can general-domain coding instructions improve performance? (3) How does integrating textual rationales with code-based ones during training enhance mathematical reasoning abilities? Our findings reveal that code-based rationales with concise comments, descriptive naming, and hardcoded solutions are beneficial, while improvements from general-domain coding instructions and textual rationales are relatively minor. Based on these insights, we propose CoinMath, a learning strategy designed to enhance mathematical reasoning by diversifying the coding styles of code-based rationales. CoinMath generates a variety of code-based rationales incorporating concise comments, descriptive naming conventions, and hardcoded solutions. Experimental results demonstrate that CoinMath significantly outperforms its baseline model, MAmmoTH, one of the SOTA math LLMs.

2024

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CRAFT: Extracting and Tuning Cultural Instructions from the Wild
Bin Wang | Geyu Lin | Zhengyuan Liu | Chengwei Wei | Nancy Chen
Proceedings of the 2nd Workshop on Cross-Cultural Considerations in NLP

Large language models (LLMs) have rapidly evolved as the foundation of various natural language processing (NLP) applications. Despite their wide use cases, their understanding of culturally-related concepts and reasoning remains limited. Meantime, there is a significant need to enhance these models’ cultural reasoning capabilities, especially concerning underrepresented regions. This paper introduces a novel pipeline for extracting high-quality, culturally-related instruction tuning datasets from vast unstructured corpora. We utilize a self-instruction generation pipeline to identify cultural concepts and trigger instruction. By integrating with a general-purpose instruction tuning dataset, our model demonstrates enhanced capabilities in recognizing and understanding regional cultural nuances, thereby enhancing its reasoning capabilities. We conduct experiments across three regions: Singapore, the Philippines, and the United States, achieving performance improvement of up to 6%. Our research opens new avenues for extracting cultural instruction tuning sets directly from unstructured data, setting a precedent for future innovations in the field.

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Resilience of Large Language Models for Noisy Instructions
Bin Wang | Chengwei Wei | Zhengyuan Liu | Geyu Lin | Nancy F. Chen
Findings of the Association for Computational Linguistics: EMNLP 2024

As the rapidly advancing domain of natural language processing (NLP), large language models (LLMs) have emerged as powerful tools for interpreting human commands and generating text across various tasks. Nonetheless, the resilience of LLMs to handle text containing inherent errors, stemming from human interactions and collaborative systems, has not been thoroughly explored. Our study investigates the resilience of LLMs against five common types of disruptions including 1) ASR (Automatic Speech Recognition) errors, 2) OCR (Optical Character Recognition) errors, 3) grammatical mistakes, 4) typographical errors, and 5) distractive content. We aim to investigate how these models react by deliberately embedding these errors into instructions. Our findings reveal that while some LLMs show a degree of resistance to certain types of noise, their overall performance significantly suffers. This emphasizes the importance of further investigation into enhancing model resilience. In response to the observed decline in performance, our study also evaluates a “re-pass” strategy, designed to purify the instructions of noise before the LLMs process them. Our analysis indicates that correcting noisy instructions, particularly for open-source LLMs, presents significant challenges.
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