@article{understandingdifficultybasedsample,
  title = {Understanding Difficulty-based Sample Weighting with a Universal Difficulty Measure},
  author = {Xiaoling Zhou and Ou wu and Weiyao Zhu and Ziyang Liang},
  year = {2023},
  eprint = {2301.04850},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2301.04850v1},
}