Shaded similarity matrix is one of the oldest graphic
techniques that has long been used in hierarchical cluster
analysis [23, 14, 30, 7]. Based on the above unified viewpoint,
we believe it could also be used in the task of classification
visualization. We will focus on the use of shaded
similarity matrix for visualizing two popular classification
methods: nearest neighbor and decision tree. We will also
explore how to attack the scalability problem using ensemble
classification and sampling techniques.