\begin{figure}[!ht] \centering \begin{subfigure}[b]{0.23\linewidth} \includegraphics[width=\linewidth]{Bilder/ContendBasedFlow.jpg} \caption{\textit{Content-Based}.} \label{fig:cb} \end{subfigure} \begin{subfigure}[b]{0.23\linewidth} \includegraphics[width=\linewidth]{Bilder/CollaborativeFlow.jpg} \caption{\textit{Collaborative-Filtering}.} \label{fig:cf} \end{subfigure} \caption{Overview of \textit{content-based} (left) and \textit{collaborative-filtering} (right) \textit{recommender systems}. \textit{Content-based recommender systems} work via \textit{feature vectors}. In contrast, \textit{collaborative filtering recommender systems} work over \textit{neighborhoods}.} \label{fig:cbcf} \end{figure}