Author

Peng Sun

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Preprint Aug 2026

CMuon: Accelerating and Stabilizing Diffusion Transformer Training via Chunked Momentum Orthogonalization

Chunked Muon (CMuon) is introduced, a simple yet highly effective strategy that partitions these matrices into independent sub-components prior to orthogonalization, effectively overcoming the late-stage convergence plateaus of vanilla Muon.

Chuyan Chen, Peng Sun, Kun Yuan · 1 citation

#machine learning Preprint Aug 2026

Hierarchical Data Selection via Manifold Coverage and Sparse Feature Coverage in LLM Post-training

MASS learns low-dimensional principal manifold coordinates with a dense autoencoder for coarse semantic grouping, and then performs quality-aware sparse feature coverage within each group using a TopK sparse autoencoder and proposes MASS.

Peng Sun, Yi Yang, Antong Zhang et al. · 0 citations

#machine learning Preprint Aug 2026

Data-DPO: Direct Preference Optimization for Target Model Data Selection in LLM Post-Training

Data-DPO, a target model-oriented SFT data selection method that consistently outperforms existing data selection baselines under multiple data budgets and stably surpasses full data training performance is proposed.

Peng Sun, Yi Yang, Antong Zhang et al. · 0 citations