Figure 4.

Violin plots for the distributions of classification accuracy of the two multi‐class classification tasks, that is, NC/AD (left) and NC/MCI (right), where the hollow white dot and the box denote the median, and the interquartile range of the classification results of 50 repetitions, respectively. From the violin plot, it can be clearly seen that our proposed method outperforms other comparison methods [Color figure can be viewed at http://wileyonlinelibrary.com]