Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 553655
Title Flexible self-organizing maps in kohonen 3.0
Author(s) Wehrens, Ron; Kruisselbrink, Johannes
Source The journal of statistical software 87 (2018)7. - ISSN 1548-7660 - 18 p.
Department(s) Biometris
Mathematical and Statistical Methods - Biometris
Publication type Refereed Article in a scientific journal
Publication year 2018
Keyword(s) Distance functions - Parallellization, R. - Self-organizing maps

Self-organizing maps (SOMs) are popular tools for grouping and visualizing data in many areas of science. This paper describes recent changes in package kohonen, implementing several different forms of SOMs. These changes are primarily focused on making the package more useable for large data sets. Memory consumption has decreased dramatically, amongst others, by replacing the old interface to the underlying compiled code by a new one relying on Rcpp. The batch SOM algorithm for training has been added in both sequential and parallel forms. A final important extension of the package’s repertoire is the possibility to define and use data-dependent distance functions, extremely useful in cases where standard distances like the Euclidean distance are not appropriate. Several examples of possible applications are presented.

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