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Sylvain Lespinats's homepage

RankVisu is a dimensionality reduction technique belonging to Non-Metric Multi Dimensional Scaling (NM MDS). This method is designed to preserve the neighborhood ranks. 

The reference: Lespinats, S.Fertil, B., Villemain, P. and Hérault, J. (2009), “RankVisu: Mapping from the neighborhood network.” Neurocomputing, 72(13-15), pp 2964-2978.

Abstract: Most multidimensional scaling methods focus on the preservation of dissimilarities to map high dimensional items in a low-dimensional space. However, the mapping function usually does not consider the preservation of small dissimilarities as important, since the cost is small with respect to the preservation of large dissimilarities. As a consequence, an item's neighborhoods may be sacrificed for the benefit of the overall mapping. We have subsequently designed a mapping method devoted to the preservation of neighborhood ranks rather than their dissimilarities: RankVisu. A mapping of data is obtained in which neighborhood ranks are as close as possible according to the original space. A comparison with both metric and non-metric MDS highlights the pros (in particular, cluster enhancement) and cons of RankVisu.


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RankVisu is closely related to DD-HDS, a non-linear mapping methode: visite the DD-HDS homepage.