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20242026
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cs.LG2026

Why Does Post-Training Quantization Work?

Yuxiang Chen, Michael Beyer, Jun Zhu +1

Post-training quantization compresses large language models (LLMs) by storing their weights at reduced precision, and each quantized weight introduces an error into the hidden stat…

cs.LG2026

Holder Policy Optimisation

Yuxiang Chen, Dingli Liang, Yihang Chen +8

Group Relative Policy Optimisation (GRPO) enhances large language models by estimating advantages across a group of sampled trajectories. However, mapping these trajectory-level ad…

cs.LG2025

TetraJet-v2: Accurate NVFP4 Training for Large Language Models with Oscillation Suppression and Outlier Control

Yuxiang Chen, Yifan Liu, Xiaoming Xu +5

Large Language Models (LLMs) training is prohibitively expensive, driving interest in low-precision fully-quantized training (FQT). While novel 4-bit formats like NVFP4 offer subst…

cs.LG2025

Oscillation-Reduced MXFP4 Training for Vision Transformers

Yuxiang Chen, Haocheng Xi, Jun Zhu +1

Pre-training Transformers in FP4 precision is becoming a promising approach to gain substantial speedup, but it comes with a considerable loss of accuracy. Microscaling (MX) data f…

cs.LG2024

Jetfire: Efficient and Accurate Transformer Pretraining with INT8 Data Flow and Per-Block Quantization

Haocheng Xi, Yuxiang Chen, Kang Zhao +3

Pretraining transformers are generally time-consuming. Fully quantized training (FQT) is a promising approach to speed up pretraining. However, most FQT methods adopt a quantize-co…