Figure 4.

Applications of feature selection in inorganic perovskites. (a) A heat map of the correlation between features. Reprinted with permission from ref. [95]. Copyright 2022 Elsevier. (b) For R of the LOOCV in the feature selection process of the $R_{H_2}$ model, the position of the red point is the maximum value of R. Reprinted with permission from ref. [30]. Copyright 2021 Elsevier. (c) The feature importance of the 21 features in predicting the formability. Reprinted with permission from ref. [46]. Copyright 2022 The Authors. (d) An evaluation index vs. feature number of ABX₃ compounds based on the recursive elimination method. Reprinted with permission from ref. [59]. Copyright 2021 Elsevier.