Chi-Heng Lin

I am a Machine Learning Researcher at Samsung AI Center - Mountain View. I work on Efficient AI and Personal Intelligence, with a focus on LLM applications.

At Samsung, I have worked on various LLM applications, including multi-token predictions, model compression, and hybrid state-space models, where our work received the Samsung Best Paper Award. I earned my PhD in Electrical and Computer Engineering at Georgia Institute of Technology, where I had the privilege of being advised by Dr. Eva L. Dyer.

Email / CV / Scholar / Twitter / Github

Research

I am passionate about advancing artificial intelligence to achieve reasoning and concept generation that surpasses human capabilities, addressing fundamental challenges through interdisciplinary machine learning techniques. My work tries to bridge the gap between practice and theory, spanning practical applications of large language models (LLMs) and the theoretical foundations of machine learning.

Filter by Topic:

FlexiGPT: Pruning and Extending Large Language Models with Low-Rank Weight Sharing James Seale Smith, Chi-Heng Lin, Shikhar Tuli, Haris Jeelani, Shangqian Gao, Yilin Shen, Hongxia Jin, Yen-Chang Hsu NAACL, 2025 Paper / Cite @misc{smith2025flexigptpruningextendinglarge, title={FlexiGPT: Pruning and Extending Large Language Models with Low-Rank Weight Sharing}, author={James Seale Smith and Chi-Heng Lin and Shikhar Tuli and Haris Jeelani and Shangqian Gao and Yilin Shen and Hongxia Jin and Yen-Chang Hsu}, year={2025}, eprint={2501.14713}, archivePrefix={arXiv}, primaryClass={cs.CL}, url={https://arxiv.org/abs/2501.14713}, } Large Language Models LLM Compression PEFT Layer pruning enables fast compression, while PEFT and weight-sharing effectively restore LLM performance.
MoDeGPT: Modular Decomposition for Large Language Model Compression Chi-Heng Lin, Shangqian Gao, James Seale Smith, Abhishek Patel, Shikhar Tuli, Yilin Shen, Hongxia Jin, Yen-Chang Hsu ICLR, 2025 (Oral Presentation, top 1.8%) Paper / Cite @article{lin2024modegpt, title={Modegpt: Modular decomposition for large language model compression}, author={Lin, Chi-Heng and Gao, Shangqian and Smith, James Seale and Patel, Abhishek and Tuli, Shikhar and Shen, Yilin and Jin, Hongxia and Hsu, Yen-Chang}, journal={arXiv preprint arXiv:2408.09632}, year={2024} } Large Language Models LLM Compression PEFT Low-rank decomposition for weight matrices can achieve SOTA compression when transformers have been partitioned into modules.
DISP-LLM: Dimension-Independent Structural Pruning for Large Language Models Shangqian Gao, Chi-Heng Lin, Ting Hua, Tang Zheng, Yilin Shen, Hongxia Jin, Yen-Chang Hsu NeurIPS, 2024 Paper / Cite @article{gao2024disp, title={DISP-LLM: Dimension-Independent Structural Pruning for Large Language Models}, author={Gao, Shangqian and Lin, Chi-Heng and Hua, Ting and Zheng, Tang and Shen, Yilin and Jin, Hongxia and Hsu, Yen-Chang}, journal={arXiv preprint arXiv:2410.11988}, year={2024} } Large Language Models LLM Compression PEFT Consecutive dimensions of blocks can be pruned independently using simple index addition and selection. This flexibility enhances the compression quality.
SLiM: Speculative Decoding with Hypothesis Reduction Chi-Heng Lin, Shikhar Tuli, James Seale Smith, Yen-Chang Hsu, Yilin Shen, Hongxia Jin NAACL-Findings, 2024 Paper / Cite @inproceedings{lin2024slim, title={SLiM: Speculative Decoding with Hypothesis Reduction}, author={Lin, Chi-Heng and Tuli, Shikhar and Smith, James and Hsu, Yen-Chang and Shen, Yilin and Jin, Hongxia}, booktitle={Findings of the Association for Computational Linguistics: NAACL 2024}, pages={1005--1017}, year={2024} } Large Language Models Multi-token Prediction Multi-token predictions enhanced by bi-gram tables significantly reduce computational FLOPS during token verification.
DynaMo: Accelerating Language Model Inference with Dynamic Multi-Token Sampling Shikhar Tuli, Chi-Heng Lin, Yen-Chang Hsu, Niraj K. Jha, Yilin Shen, Hongxia Jin NAACL, 2024 Paper / Cite @article{tuli2024dynamo, title={DynaMo: Accelerating Language Model Inference with Dynamic Multi-Token Sampling}, author={Tuli, Shikhar and Lin, Chi-Heng and Hsu, Yen-Chang and Jha, Niraj K and Shen, Yilin and Jin, Hongxia}, journal={arXiv preprint arXiv:2405.00888}, year={2024} } Large Language Models Multi-token Prediction Co-concurrence masking with adaptive thresholding enables multi-token predictions, achieving 2.57x speedup with under 5% overhead.
The Good, the Bad and the Ugly Sides of Data Augmentation: An Implicit Spectral Regularization Perspective Chi-Heng Lin, Chiraag Kaushik, Eva L. Dyer, Vidya Muthukumar JMLR, 2024a Paper / Cite @article{lin2024good, title={The good, the bad and the ugly sides of data augmentation: An implicit spectral regularization perspective}, author={Lin, Chi-Heng and Kaushik, Chiraag and Dyer, Eva L and Muthukumar, Vidya}, journal={Journal of Machine Learning Research}, volume={25}, number={91}, pages={1--85}, year={2024} } Data Augmentation Machine Learning Theory We reveal a close relationship between data augmentation and spectral regularization. Unlike ridge regression, it can both help and hurt generalization.
Your Contrastive Learning Problem is Secretly a Distribution Alignment Problem Zihao Chen, Chi-Heng Lin, Ran Liu, Jingyun Xiao, Eva L. Dyer NeurIPS, 2024 Paper / Cite @inproceedings{chenyour, title={Your contrastive learning problem is secretly a distribution alignment problem}, author={Chen, Zihao and Lin, Chi-Heng and Liu, Ran and Xiao, Jingyun and Dyer, Eva L}, booktitle={The Thirty-eighth Annual Conference on Neural Information Processing Systems} } Self-supervised Learning Optimal Transport Contrastive learning reframed as a matching problem enables generalizing existing self-supervised methods with optimal transport theory.
Balanced Data, Imbalanced Spectra: Unveiling Class Disparities with Spectral Imbalance Chiraag Kaushik, Ran Liu, Chi-Heng Lin, Amrit Khera, Matthew Y Jin, Wenrui Ma, Vidya Muthukumar, Eva L. Dyer ICML, 2024 Paper / Cite @article{kaushik2024balanced, title={Balanced Data, Imbalanced Spectra: Unveiling Class Disparities with Spectral Imbalance}, author={Kaushik, Chiraag and Liu, Ran and Lin, Chi-Heng and Khera, Amrit and Jin, Matthew Y and Ma, Wenrui and Muthukumar, Vidya and Dyer, Eva L}, journal={arXiv preprint arXiv:2402.11742}, year={2024} } Data Augmentation Machine Learning Theory Intrinsic bias in class spectra is mitigated with augmentation strategies, improving generalization across classes.
Half-Hop: A graph upsampling approach for slowing down message passing Mehdi Azabou, Venkataramana Ganesh, Shantanu Thakoor, Chi-Heng Lin, Lakshmi Sathidevi, Ran Liu, Michal Valko, Petar Veličković, Eva L. Dyer ICML, 2023 Project / Paper / Cite @inproceedings{azabou2023half, title={Half-Hop: A graph upsampling approach for slowing down message passing}, author={Azabou, Mehdi and Ganesh, Venkataramana and Thakoor, Shantanu and Lin, Chi-Heng and Sathidevi, Lakshmi and Liu, Ran and Valko, Michal and Veli{\v{c}}kovi{\'c}, Petar and Dyer, Eva L}, booktitle={International Conference on Machine Learning}, pages={1341--1360}, year={2023}, organization={PMLR} } Data Augmentation Graph Neural Networks Self-supervised Learning An upsampling method for graphs is proposed to generate augmentations and improve self-supervised learning.
Provable Acceleration of Heavy Ball beyond Quadratics for a Class of Polyak-Łojasiewicz Functions when the Non-Convexity is Averaged-Out Jun-Kun Wang, Chi-Heng Lin, Andre Wibisono, Bin Hu ICML, 2022 Paper / Cite @inproceedings{wang2022provable, title={Provable acceleration of heavy ball beyond quadratics for a class of Polyak-Lojasiewicz functions when the non-convexity is averaged-out}, author={Wang, Jun-Kun and Lin, Chi-Heng and Wibisono, Andre and Hu, Bin}, booktitle={International conference on machine learning}, pages={22839--22864}, year={2022}, organization={PMLR} } Optimization Machine Learning Theory The training acceleration of heavy ball momentum has been proved for Polyak-Łojasiewicz (PL) optimization problems.
Making transport more robust and interpretable by moving data through a small number of anchor points Chi-Heng Lin, Mehdi Azabou, Eva L. Dyer ICML, 2021 Project / Paper / Cite @article{lin2021making, title={Making transport more robust and interpretable by moving data through a small number of anchor points}, author={Lin, Chi-Heng and Azabou, Mehdi and Dyer, Eva L}, journal={Proceedings of machine learning research}, volume={139}, pages={6631}, year={2021}, publisher={NIH Public Access} } Optimal Transport Domain Adaptation A low-rank transport formulation is proposed to move data through a small number of anchor points, improving robustness and interpretability.
A Modular Analysis of Provable Acceleration via Polyak’s Momentum: Training a Wide ReLU Network and a Deep Linear Network Jun-Kun Wang, Chi-Heng Lin, Jacob Abernethy ICML, 2021 Paper / Cite @inproceedings{wang2021modular, title={A modular analysis of provable acceleration via polyak’s momentum: Training a wide relu network and a deep linear network}, author={Wang, Jun-Kun and Lin, Chi-Heng and Abernethy, Jacob D}, booktitle={International Conference on Machine Learning}, pages={10816--10827}, year={2021}, organization={PMLR} } Optimization Machine Learning Theory The training acceleration of heavy ball momentum has been proved for one-layer ReLU and deep linear networks.
Drop, Swap, and Generate: A Self-Supervised Approach for Generating Neural Activity Ran Liu, Mehdi Azabou, Max Dabagia, Chi-Heng Lin, Mohammad Gheshlaghi Azar, Keith B. Hengen, Michal Valko, Eva L. Dyer NeurIPS, 2021 (Oral Presentation) Project / Paper / Cite @article{liu2021drop, title={Drop, swap, and generate: A self-supervised approach for generating neural activity}, author={Liu, Ran and Azabou, Mehdi and Dabagia, Max and Lin, Chi-Heng and Gheshlaghi Azar, Mohammad and Hengen, Keith and Valko, Michal and Dyer, Eva}, journal={Advances in neural information processing systems}, volume={34}, pages={10587--10599}, year={2021} } Self-supervised Learning Neuroscience A generative-based self-supervised learning approach is proposed to extract interpretable representations of neural activity.
Bayesian Optimization for Modular Black-Box Systems with Switching Costs Chi-Heng Lin, Joseph D. Miano, Eva L. Dyer UAI, 2021 Paper / Cite @inproceedings{lin2021bayesian, title={Bayesian optimization for modular black-box systems with switching costs}, author={Lin, Chi-Heng and Miano, Joseph D and Dyer, Eva L}, booktitle={Uncertainty in Artificial Intelligence}, pages={1024--1034}, year={2021}, organization={PMLR} } Bayesian Optimization Neuroscience A hyperparameter tuning strategy is proposed to optimize a neuroimaging system that has different switching costs.
Mine your own view: A self-supervised approach for learning representations of neural activity Mehdi Azabou, Mohammad Gheshlaghi Azar, Ran Liu, Chi-Heng Lin, Erik C. Johnson, Kiran Bhaskaran-Nair, Max Dabagia, Bernardo Avila-Pires, Lindsey Kitchell, Keith B. Hengen, William Gray-Roncal, Michal Valko, Eva L. Dyer NeurIPS Workshop on Self-Supervised Learning, 2021 (Oral Presentation) Project / Paper / Cite @article{azabou2021mine, title={Mine your own view: Self-supervised learning through across-sample prediction}, author={Azabou, Mehdi and Azar, Mohammad Gheshlaghi and Liu, Ran and Lin, Chi-Heng and Johnson, Erik C and Bhaskaran-Nair, Kiran and Dabagia, Max and Avila-Pires, Bernardo and Kitchell, Lindsey and Hengen, Keith B and others}, journal={arXiv preprint arXiv:2102.10106}, year={2021} } Self-supervised Learning Neuroscience Learning representations from nearest neighbors allows us to leverage the diversity within the latent space.
Escaping saddle points faster with stochastic momentum Jun-Kun Wang, Chi-Heng Lin, Jacob Abernethy ICLR, 2020 Paper / Cite @article{wang2021escaping, title={Escaping saddle points faster with stochastic momentum}, author={Wang, Jun-Kun and Lin, Chi-Heng and Abernethy, Jacob}, journal={arXiv preprint arXiv:2106.02985}, year={2021} } Optimization Machine Learning Theory We prove that stochastic momentum can escape saddle points faster than gradient descent.

Miscellanea

I am Catman (tier S superhero), Master Chef specializing in instant noodles and curry, and a sleeping agent who enjoys sleeping. Uhhh... I enjoy cracking math puzzles for fun, too 😂

"For the things we have to learn before we can do them, we learn by doing them."

— Aristotle