Pikk
Genetic Algorithm Pool Selection.
Installation
Add this line to your application's Gemfile:
gem 'pikk'And then execute:
$ bundle
Or install it yourself as:
$ gem install pikk
Usage
WARNING! Your hash should have the keys
:nameand:weight!
There are two methods. One is single_select and the other is pool. Former, select one hash object from the array by its weight, and return it. Latter, do an iteration of selection, 50 by default, and return the array. See examples/ for more.
require 'pikk'
ary = [{name: 'a', weight: 5.5}, {name: 'b', weight: 3}, {name: 'c', weight: 7}, {name: 'd', weight: 1.5}]
Pikk.single_select(ary)
# => {:name=>"c", :weight=>7, :count=>0, :probability=>0.4117647058823529}
Pikk.pool(ary)
# => [{:name=>"c", :weight=>7, :count=>22, :probability=>0.4117647058823529}, {:name=>"a", :weight=>5.5, :count=>15, :probability=>0.3235294117647059}, {:name=>"b", :weight=>3, :count=>8, :probability=>0.17647058823529413}, {:name=>"d", :weight=>1.5, :count=>5, :probability=>0.08823529411764706}]
Pikk.pool(ary, iteration: 100)
# => [{:name=>"c", :weight=>7, :count=>37, :probability=>0.4117647058823529}, {:name=>"a", :weight=>5.5, :count=>34, :probability=>0.3235294117647059}, {:name=>"b", :weight=>3, :count=>18, :probability=>0.17647058823529413}, {:name=>"d", :weight=>1.5, :count=>11, :probability=>0.08823529411764706}]
Pikk.pool(ary, iteration: 1000, pp: true)
# =>
# +-----------------+--------+-------+---------------------+--------------------+
# | Name | Weight | Count | Probability | (C/(P*I)) |
# +-----------------+--------+-------+---------------------+--------------------+
# | c | 7 | 417 | 0.4117647058823529 | 1.0127142857142857 |
# | a | 5.5 | 309 | 0.3235294117647059 | 0.955090909090909 |
# | b | 3 | 163 | 0.17647058823529413 | 0.9236666666666666 |
# | d | 1.5 | 111 | 0.08823529411764706 | 1.258 |
# +-----------------+--------+-------+---------------------+--------------------+
# | Iteration Count | 1000 |
# +-----------------+--------+-------+---------------------+--------------------+
# | Sum Ratio | 0.03736796536796527 |
# +-----------------+--------+-------+---------------------+--------------------+Development
After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.
To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.
Contributing
Bug reports and pull requests are welcome on GitHub at https://github.com/aoozdemir/pikk. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.
License
The gem is available as open source under the terms of the MIT License.
Code of Conduct
Everyone interacting in the Pikk project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.