Nomogram visualization for ranking support vector machine

Authors:
Nguyen Thi Thanh Thuy;Nguyen Thi Ngoc Vinh;Ngo Anh Vien
Affiliations:
Faculty of Information Technology, Posts and Telecommunications Institute of Technology, Hanoi, Vietnam;Faculty of Information Technology, Posts and Telecommunications Institute of Technology, Hanoi, Vietnam;Department of Computer Science, School of Computing, National University of Singapore, Singapore
Venue:
ISNN'11 Proceedings of the 8th international conference on Advances in neural networks - Volume Part II
Year:
2011

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Abstract

In this paper, we propose a visualization model for a trained ranking support vector machine. In addition, we also introduce a feature selection method for the ranking support vector machine, and show visually each feature's effect. Nomogram is a well-known visualization model that graphically describes completely the model on a single graph. The complexity of the visualization does not depend on the number of the features but on the properties of the kernel. In order to represent the effect of each feature on the log odds ratio on the nomograms, we use probabilistic ranking support vector machines which map the support vector machine outputs into a probabilistic sigmoid function whose parameters are trained by using cross-validation. The experiments show the effectiveness of our proposal which helps the analysts study the effects of predictive features.