@article{diff2differentialprivateoptimizationvia,
  title = {DIFF2: Differential Private Optimization via Gradient Differences for Nonconvex Distributed Learning},
  author = {Tomoya Murata and Taiji Suzuki},
  year = {2023},
  eprint = {2302.03884},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2302.03884v2},
}