Uniform versus uncertainty sampling: When being active is less efficient than staying passive
Uniform versus uncertainty sampling: When being active is less efficient than staying passive
复制标题
均匀采样与不确定性采样:主动的效率低于被动的效率
DOI:
10.48550/arxiv.2212.00772
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发表时间:
2022
期刊:
影响因子:
--
通讯作者:
Fanny Yang
中科院分区:
文献类型:
--
作者:
A. Tifrea;Jacob Clarysse;Fanny Yang
It is widely believed that given the same labeling budget, active learning algorithms like uncertainty sampling achieve better predictive performance than passive learning (i.e. uniform sampling), albeit at a higher computational cost. Recent empirical evidence suggests that this added cost might be in vain, as uncertainty sampling can sometimes perform even worse than passive learning. While existing works offer different explanations in the low-dimensional regime, this paper shows that the underlying mechanism is entirely different in high dimensions: we prove for logistic regression that passive learning outperforms uncertainty sampling even for noiseless data and when using the uncertainty of the Bayes optimal classifier. Insights from our proof indicate that this high-dimensional phenomenon is exacerbated when the separation between the classes is small. We corroborate this intuition with experiments on 20 high-dimensional datasets spanning a diverse range of applications, from finance and histology to chemistry and computer vision.
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DOI:
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发表时间:
2022
期刊:
International Conference on Artificial Intelligence and Statistics
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期刊:
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期刊:
arXiv: Machine Learning
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DOI:
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发表时间:
2020-05
期刊:
J. Mach. Learn. Res.
影响因子:
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