@article{JMLR'24:Sword++,
    author = {Peng Zhao and
                    Yu-Jie Zhang and
                    Lijun Zhang and
                    Zhi-Hua Zhou},
    title = {Adaptivity and Non-stationarity: Problem-dependent Dynamic Regret for Online Convex Optimization},
    journal = {Journal of Machine Learning Research},
    volume = {25},
    number = {98},
    pages = {1 -- 52},
    year = {2024}
}