Copula for Instance-wise Feature Selection and Rank

Hanyu Peng, Guanhua Fang, Ping Li

Keywords: copula, feature selection

TL;DR: Towards an end-to-end feature selection with copula to explore feature correlation

Abstract: Instance-wise feature selection and ranking methods can achieve a good selection of task-friendly features for each sample in the context of neural networks. However, existing approaches that assume feature subsets to be independent are imperfect when considering the dependency between features. To address this limitation, we propose to incorporate the Gaussian copula, a powerful mathematical technique for capturing correlations between variables, into the current feature selection framework with no additional changes needed. Experimental results on both synthetic and real datasets, in terms of performance comparison and interpretability, demonstrate that our method is capable of capturing meaningful correlations.