rrtt

\begin{align}
w_{d} & = \log \left(\frac{\sum_{d^{\prime} & = 1}^{\mathcal{D}} \sum_{h & = 1}^{\mathcal{H}} d_{i s t}\left(x_{h}^{d^{\prime}}, x_{h}^{*}\right)}{\sum_{h & = 1}^{\mathcal{H}} d_{i s t}\left(x_{h}^{d}, x_{h}^{*}\right)}\right)
\end{align}