Technical Program

Paper Detail

Session:Learning Theory and Models
Time:Thursday, May 20, 15:30 - 17:30
Presentation: Poster
Topic: Machine Learning for Signal Processing: Signal detection, Pattern Recognition and Classification
Authors: Yi Liu; Ohio State University 
 Yuan F. Zheng; Ohio State University 
Abstract: This paper presents a novel feature selection method which is named Filtered and Supported Sequential Forward Search (FS_SFS) in the context of Support Vector Machines (SVM). In comparison with conventional wrapper methods employing the sequential forward search (SFS) strategy, it has two important features that reduce the computation time of SVM training during the feature selection process. First, in stead of utilizing all the training samples to obtain the classifier, FS_SFS, by taking advantage of the existence of support vectors in SVM, dynamically maintains an active data set for each SVM to be trained on. In this way the computational demand of a single SVM training decreases. Secondly, a new criterion, in which discriminant ability of individual features and the correlation between them are both taken into consideration, is proposed to effectively filter out non-essential features before every SFS iteration begins. As a result, the total number of training is significantly reduced. The proposed approach is tested on both synthetic and real data to demonstrate its effectiveness and efficiency.

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