Region of Interest Selection for Functional Features.
Region of Interest Selection for Functional Features.
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DOI:
10.1016/j.neucom.2020.10.009
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发表时间:
2021-01
期刊:
影响因子:
6
通讯作者:
Hahn J
中科院分区:
文献类型:
--
作者:
Wang Q;Lu Y;Zhang X;Hahn J
Feature selection is a critical component in supervised learning to improve model performance. Searching for the optimal feature candidates can be NP-hard. With limited data, cross-validation is widely used to alleviate overfitting, which unfortunately suffers from high computational cost. We propose a highly innovative strategy in feature selection to reduce the overfitting risk but without cross-validation. Our method selects the optimal sub-interval, i.e., region of interest (ROI), of a functional feature for functional linear regression where the response is a scalar and the predictor is a function. For each candidate sub-interval, we evaluate the overfitting risk by calculating a necessary sample size to achieve a pre-specified statistical power. Combining with a model accuracy measure, we rank these sub-intervals and select the ROI. The proposed method has been compared with other state-of-the-art feature selection methods on several reference datasets. The results show that our proposed method achieves an excellent performance in prediction accuracy and reduces computational cost substantially.
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