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Combining Support Vector Machines With a Pairwise Decision Tree

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3 Author(s)
Jin Chen ; Sch. of Electron. Sci. & Eng., Nat. Univ. of Defense Technol., Changsha ; Cheng Wang ; Runsheng Wang

To address the multiclass classification problem of hyperspectral data, a new method called pairwise decision tree of support vector machines (PDTSVM) is proposed. For an N -class problem, after training N(N - 1)/2 binary support vector machines (SVMs) for each pair of information class, PDTSVM only requires N - 1 binary SVMs for one classification. Based on the separability estimated by the geometric margin between two classes, binary SVMs are recursively selected by using a fast sequential forward selection. Each binary SVM is used to exclude the less-similar class. PDTSVM eliminates the wrong votes of the one-against-one method. It also has much fewer layers than other tree-based methods, which decreases accumulated errors. Tested with an 11-class problem, the results demonstrate the effectiveness of our method.

Published in:

Geoscience and Remote Sensing Letters, IEEE  (Volume:5 ,  Issue: 3 )