Charlie 0.5.0 Released - A genetic algorithms library

Hi all,

I’m pleased to announce the first public release of charlie, a genetic
algorithms library for Ruby.

FEATURES:

  • Quickly develop GAs by combining several parts (genotype, selection,
    crossover, mutation) provided by the library.
  • Sensible defaults are provided with any genotype, so often you only
    need to define a fitness function.
  • Easily replace any of the parts by your own code.
  • Test different strategies in GA, and generate reports comparing them.

EXAMPLE: (also at http://pastie.caboo.se/130559 with better

formatting)
This example finds the binary representation of the number 512.

require ‘rubygems’
require ‘charlie’
class Find512 < BitStringGenotype(10) # choose a genotype, in this
case a list of 10 bits represents a solution

Define a fitness function. This one returns minus the offset to

the best solution, so a higher number is better.

Usually, you won’t know the best solution, and will define this

as some value that needs to be maximized.
def fitness
# Use the ‘genes’ function to retrieve the array of bits
representing this solution.
-(genes.map(&:to_s).join.to_i(2) - 512).abs
end
end

Finally, create an instance of a population (with the default size

of 20) and let it run for the default number of 100 generations.
Population.new(Find512).evolve_on_console

RUBYQUIZ #142 SOLUTION:

I know, it’s a bit late. :wink:

require ‘rubygems’
require ‘charlie’
N=5
CITIES = (0…N).map{|i| (0…N).map{|j| [i,j] } }.inject{|a,b|a+b}
class TSP < PermutationGenotype(CITIES.size)
def fitness
d=0
(genes + [genes[0]]).each_cons(2){|a,b|
a,b=CITIES[a],CITIES[b]
d += Math.sqrt( (a[0]-b[0])**2 + (a[1]-b[1])**2 )
}
-d # lower distance -> higher fitness.
end
end
pop = Population.new(TSP,20).evolve_on_console(50)

Several other simple examples are included in the gem/tarball.

INSTALLATION:

  • sudo gem install charlie

Links

LICENSE:

MIT license.

Excellent, I’ve been wanting such a library for a while now. Cheers!

On Dec 19, 2007 11:22 PM, Sander L. [email protected] wrote:

  • Easily replace any of the parts by your own code.
    the best solution, so a higher number is better.
    Population.new(Find512).evolve_on_console
    d=0

INSTALLATION:

  • sudo gem install charlie

Links

Awesome work!

Going to check it out… Thanks.


Let them talk of their oriental summer climes of everlasting
conservatories; give me the privilege of making my own summer with my
own coals.

http://gnufied.org

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