\begin{equation}
\label{eq:pass_matching}
\begin{aligned}
& where \, f\left(X_i\right)= \\
& \left\{
\begin{aligned}
    1,& \, if \, utf\left(X_i\right) \, passed \, and \, \sum_{j}^{m} x_j \exists X_i \\
    0,& \, \mathrm{otherwise}
\end{aligned}
\right.
\end{aligned}
\end{equation}
