ruby-mhl

A Ruby metaheuristics library

Installation

Stable version

You can get the stable version of ruby-mhl by installing the mhl gem from RubyGems:

gem install mhl

Development version

If you want to try the development version of ruby-mhl, instead, just place this line:

“by gem ‘mhl’, git: ‘https://github.com/mtortonesi/ruby-mhl.git’

“

in your Gemfile and run:

bundle install

Examples

Here is an example demonstrating how to find the argument that minimizes the 2-dimension parabola x_1 ^ 2 + x_2 ^ 2 equation with a genetic algorithm:

“by require ‘mhl’

solver = MHL::GeneticAlgorithmSolver.new(

population_size => 40,

genotype_space_type => :integer,

mutation_probability => 0.5,

recombination_probability => 0.5,

genotype_space_conf => {

:dimensions         => 2,
:recombination_type => :intermediate,
:random_func        => lambda { Array.new(2) { rand(20) } }

},

exit_condition => lambda {|generation,best| best[:fitness] == 0} ) solver.solve(Proc.new{|x| -(x[0] ** 2 + x[1] ** 2) })

“

and with particle swarm optimization:

“by require ‘mhl’

solver = MHL::ParticleSwarmOptimizationSolver.new(

swarm_size => 40,

random_position_func => lambda { Array.new(2) { rand(20) } },

random_velocity_func => lambda { Array.new(2) { rand(10) } },

exit_condition => lambda {|generation,best| best[:height].abs < 0.001 }, ) solver.solve(Proc.new{|x| -(x[0] ** 2 + x[1] ** 2) })

“

Other examples and a full documentation will be publised as ruby-mhl matures.

License

MIT