Approximate Cluster Heat Maps of Large High-Dimensional Data

Abstract

The problem of determining whether clusters are present in numerical data (tendency assessment) is an important first step of cluster analysis. One tool for cluster tendency assessment is the visual assessment of tendency (VAT) algorithm. VAT and improved VAT (iVAT) produce an image that provides visual evidence about the number of clusters to seek in the original dataset. These methods have been successful in determining potential cluster structure in various datasets, but they can be computationally expensive for datasets with a very large number of samples. A scalable version of iVAT called siVAT approximates iVAT images, but siVAT can be computationally expensive for big datasets. In thi..