Sam Cheng
rcheng12@illinois.edu
/ Google Scholar
/ LinkedIn
I am an incoming research scientist at Google, starting July 2025.
I completed my PhD in computer science at the University of Illinois Urbana-Champaign, and my undergraduate in computer science at the University of California, Davis.
Publications
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pytest-ranking: A Regression Test Prioritization Tool for Python
Runxiang Cheng, Kaiyao Ke, Darko Marinov
33rd ACM International Conference on the Foundations of Software Engineering
FSE 2025, Demonstrations
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Agentic Bug Reproduction for Effective Automated Program Repair at Google
Runxiang Cheng, Michele Tufano, Jürgen Cito, José Cambronero, Pat Rondon, Renyao Wei, Aaron Sun, and Satish Chandra
Preprint 2025
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Large Language Models as Configuration Validators
Xinyu Lian*, Yinfang Chen*, Runxiang Cheng, Jie Huang, Parth Thakkar, Minjia Zhang, and Tianyin Xu
47th IEEE/ACM International Conference on Software Engineering
ICSE 2025
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Revisiting Test-Case Prioritization on Long-Running Test Suites
Runxiang Cheng, Shuai Wang, Reyhaneh Jabbarvand, and Darko Marinov
33rd ACM SIGSOFT International Symposium on Software Testing and Analysis
ISSTA 2024
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Efficient Modality Selection in Multimodal Learning
Yifei He*, Runxiang Cheng*, Gargi Balasubramaniam*, Yao-Hung Hubert Tsai, and Han Zhao
Journal of Machine Learning Research, Volume 25
JMLR 2024
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Exploring CXL-based KV Cache Storage for LLM Serving
Yupeng Tang*, Runxiang Cheng*, Ping Zhou, Tongping Liu, Kyoungryun Bae, Jianjun Chen, Wu Xiang, Fei Liu, Wei Tang, and Rui Shi
38th Annual Conference on Neural Information Processing Systems
NeurIPS 2024, Machine Learning for Systems Workshop
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Towards GPU Memory Efficiency for Distributed Training at Scale
Runxiang Cheng, Chris Cai, Selman Yilmaz, Rahul Mitra, Malay Bag, Mrinmoy Ghosh, and Tianyin Xu
14th ACM Symposium on Cloud Computing
SoCC 2023
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Greedy Modality Selection via Approximate Submodular Maximization
Runxiang Cheng*, Gargi Balasubramaniam*, Yifei He*, Yao-Hung Hubert Tsai, and Han Zhao
38th Conference on Uncertainty in Artificial Intelligence
UAI 2022
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Test-Case Prioritization for Configuration Testing
Runxiang Cheng, Lingming Zhang, Darko Marinov, and Tianyin Xu
30th ACM SIGSOFT International Symposium on Software Testing and Analysis
ISSTA 2021 (ACM SIGSOFT Distinguished Paper Award)
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Testing Configuration Changes in Context to Prevent Production Failures
Xudong Sun*, Runxiang Cheng*, Jianyan Chen, Ran Ang, Owolabi Legunsen, and Tianyin Xu
14th USENIX Symposium on Operating Systems Design and Implementation
OSDI 2020
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A Visual Attention Grounding Neural Model for Multimodal Machine Translation
Mingyang Zhou, Runxiang Cheng, Yong Jae Lee, and Zhou Yu
2018 Conference on Empirical Methods in Natural Language Processing
EMNLP 2018, Long Paper
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Gunrock: Building A Human-Like Social Bot By Leveraging Large Scale Real User Data
Chun-Yen Chen, Dian Yu, Weiming Wen, Yi Mang Yang, Jiaping Zhang, Mingyang Zhou, Kevin Jesse, Austin Chau, Antara Bhowmick, Shreenath Iyer, Giritheja Sreenivasulu, Runxiang Cheng, Ashwin Bhandare, and Zhou Yu
2018 Alexa Prize Socialbot Grand Challenge (Champion Team)
Education
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University of Illinois Urbana-Champaign, 2019-2025
Ph.D. in Computer Science, advised by Darko Marinov
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University of California, Davis, 2016-2019
B.S. in Computer Science
Employment
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Google, July 2025-Ongoing
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Google, Fall 2024
- Research Intern. DevAI Research, Software Engineering Agent
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TikTok, Summer 2024
- Research Intern. LLM Inference System
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Meta, Summer-Fall 2022
- Research Intern and Part-Time Researcher. GPU Capacity for AI Training
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IBM Research, Summer 2020
- Research Intern. Cloud Infrastructure Code Reliability
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University of Illinois Urbana-Champaign, 2019-2025
- Graduate Research Assistant
- Graduate Teaching Assistant. Cloud Computing (CS 598, CS 498), Intro Computing (CS 105)
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University of California, Davis, 2017-2019
- Undergraduate Research Assistant
- Part-Time Tutor. Discrete Math (ECS 020)
Service
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Reviewer
- Transactions on Software Engineering (TSE). 2024
- Journal of Systems and Software (JSS). 2024
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External Reviewer
- MobiSys 2019, OSDI 2020, ASE 2020, ICSE 2021