\begin{figure}[H]
\centering
\includegraphics[width=\columnwidth,height=8cm]{images/bottleneck/tsne_merged_horizontal.png}
\caption{t-SNE visualization of bottleneck features for benign and malignant BUS-BRA \cite{WilfridoGomezFlores.2023} samples. Without NMB, the learned features exhibit substantial inter-class overlap. In contrast, incorporating NMB leads to clearer class separation, as reflected by a higher silhouette score (0.26 vs. 0.05).}
\label{fig:feature_level}
\end{figure}