LinearForwardSelection
Package
weka.attributeSelection
Synopsis
LinearForwardSelection:
Extension of BestFirst. Takes a restricted number of k attributes into account. Fixed-set selects a fixed number k of attributes, whereas k is increased in each step when fixed-width is selected. The search uses either the initial ordering to select the top k attributes, or performs a ranking (with the same evalutator the search uses later on). The search direction can be forward, or floating forward selection (with opitional backward search steps).
For more information see:
Martin Guetlein (2006). Large Scale Attribute Selection Using Wrappers. Freiburg, Germany.
Available in Weka 3.6.x - 3.7.1. Available via the package management system for Weka >= 3.7.2 (linearForwardSelection).
Options
The table below describes the options available for LinearForwardSelection.
Option |
Description |
|---|---|
forwardSelectionMethod |
Set the direction of the search. |
lookupCacheSize |
Set the maximum size of the lookup cache of evaluated subsets. This is expressed as a multiplier of the number of attributes in the data set. (default = 1). |
numUsedAttributes |
Set the amount of top-ranked attributes that are taken into account by the search process. |
performRanking |
Perform initial ranking to select top-ranked attributes. |
searchTermination |
Set the amount of backtracking. Specify the number of |
startSet |
Set the start point for the search. This is specified as a comma seperated list off attribute indexes starting at 1. It can include ranges. Eg. 1,2,5-9,17. |
type |
Set the type of the search. |
verbose |
Turn on verbose output for monitoring the search's progress. |