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NAME

i.pr.features_selection - Module for feature selection. i.pr: Pattern Recognition environment for image processing. Includes kNN, Decision Tree and SVM classification techniques. Also includes cross-validation and bagging methods for model validation.

KEYWORDS

imagery, image processing, pattern recognition

SYNOPSIS

i.pr.features_selection
i.pr.features_selection help
i.pr.features_selection [-w] features=string output=string [npc=integer] [svm_kernel=string] [svm_kp=float] [svm_C=float] [svm_cost=float] fs_type=string [fs_rfe=integer] [svm_tol=float] [svm_eps=float] [svm_maxloops=integer] [svm_verbose=integer] [--verbose] [--quiet]

Flags:

-w
Produce file containing weights at each step.
--verbose
Verbose module output
--quiet
Quiet module output

Parameters:

features=string
Input file containing the features (output of i.pr_features).
output=string
Name of the output file containing the selected features.
npc=integer
Number of the principal components to be used for the model development.
If not set all the principal components will be used.
Ignored if features does not contain principal components model.
svm_kernel=string
For svm: type of employed kernel.
Options: gaussian,linear
Default: linear
svm_kp=float
For svm: kernel parameter (Required parameter if you are using gaussian kernel).
svm_C=float
For svm: optimization parameter (Required parameter).
svm_cost=float
Cost parameter for the implementation of cost-sensitive procedure(w in [-1,1]).
w>0 results higher weight on examples of class 1.
w<0 results higher weight on examples of class -1.
w=0 corresponds to standard SVM.
Default: 0.0
fs_type=string
Feature selection method.
Options: rfe,e_rfe,1_rfe,sqrt_rfe
fs_rfe=integer
If you are using the e_rfe method, you have to choose the number of feartures
for the classical rfe method to start (fs_rfe>1).
svm_tol=float
For svm: tollerance parameter.
Default: 0.001
svm_eps=float
For svm: epsilon.
Default: 0.001
svm_maxloops=integer
For svm: maximum number of optimization steps.
Default: 1000
svm_verbose=integer
For svm: if it is set to 1 the number of loops will be printed.
Options: 0,1
Default: 0

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