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• W4281628080 abstract "• The paper proposes two weighted c-medoid batch SOM for dissimilarity data. • The paper extends the batch SOM with C-medoids and multi-medoids algorithms. • The training of the new batch SOM algorithms are based on suitable cost functions. • The paper gives the cluster representatives and relevance weights of the c-medoids. • The paper provides the optimal assignment of the objects to the clusters. • The paper gives a meaningful evaluation of the proposed methods. This paper proposes two new batch SOM algorithms for dissimilarity data, namely RBSOM-CWMdd and RBSOM-ACWMdd, both designed to give a crisp partition aiming to preserve the topological properties of the data on the map. RBSOM-CWMdd is a batch SOM algorithm for dissimilarity data where each cluster representative is a set of weighted objects whose cardinality is fixed, being the same for all clusters. These weights are computed according to each object relevance to the referred cluster. Likewise, RBSOM-ACWMdd is a batch SOM algorithm for dissimilarity data where each cluster representative is a vector of weighted objects selected according to its relevance to the referred cluster. Therefore, the dimensionality of the cluster representatives self adapt to the particular dataset analysed, change at each algorithm iteration and can differ from one cluster to another. Experiments with 12 datasets from the UCI machine learning repository regarding the metrics of Normalized Mutual Information, Topological error, and Silhouette Coefficient showed that the proposed methods improved, respectively, the traditional set-medoids and multi-medoids SOM methods with a competitive temporal complexity. In addition, it was performed an application study on Ecoli dataset where the proposed RBSOM-ACWMdd algorithms produced a better mapping from a clustering point of view." @default.
• W4281628080 created "2022-06-13" @default.
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• W4281628080 date "2022-08-01" @default.
• W4281628080 modified "2023-09-27" @default.
• W4281628080 title "Two weighted c-medoids batch SOM algorithms for dissimilarity data" @default.
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• W4281628080 doi "https://doi.org/10.1016/j.ins.2022.06.019" @default.
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