Algorithm 2 The procedure for SSFBEL framework.

Input:s, c, $\lambda$, ${\mathit{X}}_i=[{\mathit{X}}_{i1},{\mathit{X}}_{i2},\cdots ,{\mathit{X}}_{ic}]\in {\mathbb{R}}^{d_j\times n}$, ${\mathit{y}}_i\in {\mathbb{R}}^{d_j}$, where $i=1,2,\cdots ,p_j$ and    $p_j=s-j+1$; Output: The label of testing data under scale j: $r_j$.   1: Compute ${\mathbf{\alpha }}_i^{*}$ by Equation (2);   2: Compute ${\mathit{z}}_i$ by Equation (3);   3: Compute $r_j={argmax}_{k\in \left[c\right]}\{{\sum }_{i=1}^{p_j}\mathbb{I}(z_i=k)\}$.