@article{approximationoflogpartitionfunctioninpol,
  title = {Approximation of Log-Partition Function in Policy Mirror Descent Induces Implicit Regularization for LLM Post-Training},
  author = {Zhenghao Xu and Qin Lu and Changlong Yu and Tuo Zhao},
  year = {2026},
  eprint = {2602.05933},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2602.05933},
}