Algorithm 1Operation choice mechanism.

$\mathrm{Input}:\mathrm{SAC}\mathrm{Block}\mathrm{input}\mathit{I}=\{I_{\mathit{c}}, \mathit{c}=\mathbf{1},\dots ,C\}$,     $\mathit{F}\_\mathit{S}\mathit{i}\mathit{g}\mathit{m}\mathit{o}\mathit{i}\mathit{d}$ output $\mathit{S}=\{s_{\mathit{c}}, \mathit{c}=\mathbf{1},\dots ,C\}$, $\mathrm{Scale}\mathrm{Choice}\mathrm{layer}\mathrm{weights}\mathit{W}=\{{\mathit{w}}_{\mathit{c}}, \mathit{c}=\mathbf{1},\dots ,C,\mathbf{0}\le {\mathit{w}}_{\mathit{C}}\le \mathbf{1}\}$  Output: $b\mathrm{th}\mathrm{SAC}\mathrm{Block}\mathrm{output}{Y}_{{\mathit{c}}_{\mathit{b}}^{*}}$ 1  Set $\mathit{t}\mathit{h}\mathit{r}$ = 0.2 2    Set ${\mathit{c}}_{\mathit{b}}^{\mathbf{*}}=\mathbf{0}$ 3    for c = 1: $C$ do 4      if ${\mathit{w}}_c$ > $\mathit{t}\mathit{h}\mathit{r}$ do 5        $Y_{{\mathit{c}}_{\mathit{b}}^{\mathbf{*}}}=I_{\mathit{c}}\times s_{\mathit{c}}\times {\mathit{w}}_{\mathit{c}}$ 6         ${\mathit{c}}_{\mathit{b}}^{\mathbf{*}}$++ 7    end end