Enhancing Both Efficiency and Representational Capability of Isomap by Extensive Landmark Selection
2D embeddings of the crossed S-curve data calculated by LLE, Laplacian eigenmap, Isomap, L-Isomap, and EL-Isomap, respectively. The fuscous points shown in the top left figure are the adopted landmarks by L-Isomap and EL-Isomap.
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