Feature Selection
Feature Selection is a library of feature selection algorithms.
en.wikipedia.org/wiki/Feature_selection
Install
gem sources -a http://gems.github.com
sudo gem install feature_selection
How To Use
There are currently 3 implemented feature collections: Chi-Squared, Mutual Information and Frequency Based.
Each return a hash that looks similar to:
{klass => {term => score, term => score}, klass => {term => score}}
Example:
data = {
:spam => [['this', 'is', 'some', 'information'], ['this', 'is', 'something', 'that', 'is', 'information']],
:ham => [['this', 'test', 'some', 'more', 'information'], ['there', 'are', 'some', 'things']],
}
a = FeatureSelection::ChiSquared.new(data)
# You can also use...
# FeatureSelection::MutualInformation
# FeatureSelection::FrequencyBased
a.rank_features
#=> {:spam => {term => score, term => score}, :ham => {term => score}}
Copyright
Copyright © 2009 reddavis. See LICENSE for details.