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Title: Solutions to Instability Problems with Sequential Wrapper-based Approaches to Feature Selection
Author: Dunne, Kevin
Cunningham, Pádraig
Azuaje, Francisco
Keywords: Computer Science
Issue Date: Jul-2002
Publisher: Trinity College Dublin, Department of Computer Science
Citation: Dunne, Kevin; Cunningham, Pádraig; Azuaje, Francisco. 'Solutions to Instability Problems with Sequential Wrapper-based Approaches to Feature Selection'. - Dublin, Trinity College Dublin, Department of Computer Science, TCD-CS-2002-28, 2002, pp22
Series/Report no.: Computer Science Technical Report
Abstract: It is generally accepted that Wrapper approaches will outperform Filter-based approaches to feature selection, particularly in situations where an adequate amount of data is available. What is often overlooked is that Wrapper approaches can be unstable. For instance, different partitionings of the training data can result in di erent routes through the search space and thus in di erent feature subsets being selected. In this paper we illustrate examples of this problem and a solution based on the aggregation of several runs of a sequential search is suggested. This is essentially an ensemble solution to instability in feature subset selection and it does seem to stabilise the process.
Appears in Collections:Computer Science Technical Reports

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