@article{driftconstrainedoptimizationonlydirectio,
  title = {Drift-Constrained Optimization: Only Direction Matters in Fine-Tuning Instruct Models},
  author = {Fei Yuan and Changjiang Gao and Yilei Tu and Yifeng Liu and Shujian Huang and Yu Qiao},
  year = {2026},
  eprint = {2609.13680},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.13680},
}