$$\begin{aligned}{} {} s_p^2 &= \eta _1 \ \left( \sum _{h1 \in \mathcal {H}_{\text {not}}} s_{h1} \ y_p^{h1}\right) + (1-\eta _1) \ \left( \sum _{h1 \in \mathcal {H}_{\text {not}}} w_p^{h1} \ s_{h1}\right) \nonumber \\{} & {} \quad ...