Adaptive scale-invariant online algorithms for learning linear models
Adaptive scale-invariant online algorithms for learning linear models
复制标题
用于学习线性模型的自适应尺度不变在线算法
DOI:
--
复制
发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Manfred K. Warmuth
中科院分区:
文献类型:
--
作者:
Michal Kempka;W. Kotłowski;Manfred K. Warmuth
We consider online learning with linear models, where the algorithm predicts on sequentially revealed instances (feature vectors), and is compared against the best linear function (comparator) in hindsight. Popular algorithms in this framework, such as Online Gradient Descent (OGD), have parameters (learning rates), which ideally should be tuned based on the scales of the features and the optimal comparator, but these quantities only become available at the end of the learning process. In this paper, we resolve the tuning problem by proposing online algorithms making predictions which are invariant under arbitrary rescaling of the features. The algorithms have no parameters to tune, do not require any prior knowledge on the scale of the instances or the comparator, and achieve regret bounds matching (up to a logarithmic factor) that of OGD with optimally tuned separate learning rates per dimension, while retaining comparable runtime performance.
DOI:
--
发表时间:
2017
期刊:
Advances in Neural Information Processing Systems 30
影响因子:
--
作者:
Orabona, Francesco;Tommasi, Tatiana
通讯作者:
Tommasi, Tatiana