kdiogenes

kdiogenes

Genetic Algorithms in Elixir: Chapter 1 sample implementation in Ruby finds a solution much faster

I translated the implementation in Chapter 1 (without mutation) for Ruby and get surprised that it’s find a solution much faster than the Elixir implementation.

The Ruby implementation finds the solution in about 10 seconds, while the Elixir one takes about 1 minute. I get a bit surprised by this result and couldn’t think of an explanation for this difference.

I’m sharing my Ruby implementation for anyone curious to explain this difference:

#!/usr/bin/env ruby
population =
  Array.new(100) do
    Array.new(1000) { [0, 1].sample }
  end

def evaluate(population)
  population.sort_by(&:sum).reverse
end

def selection(population)
  population.each_slice(2)
end

def crossover(population)
  population.reduce([]) do |offspring, parents|
    cx_point = cut = rand(1...parents[0].length)
    child1 = parents[0][0...cx_point] + parents[1][cx_point..-1]
    child2 = parents[1][0...cx_point] + parents[0][cx_point..-1]
    offspring << child1 << child2
  end
end

def algorithm(population)
  loop do
    best = population.max_by(&:sum)
    print "Current Best: #{best.sum}\r"
    break best if best.sum == 1000

    population = evaluate(population)
    population = selection(population)
    population = crossover(population)
  end
end

solution = algorithm(population)
puts "\nAnswer is\n"
puts solution.inspect

First Post!

kdiogenes

kdiogenes

After going further in the book (the algorithms have more output) I verified that the ruby implementation takes more generations to find the solution, but it runs each generation faster.

Where Next?

Popular Pragmatic Bookshelf topics Top

iPaul
page 37 ANTLRInputStream input = new ANTLRInputStream(is); as of ANTLR 4 .8 should be: CharStream stream = CharStreams.fromStream(i...
New
mikecargal
Title: Hands-On Rust (Chapter 11: prefab) Just played a couple of amulet-less games. With a bit of debugging, I believe that your can_p...
New
lirux
Hi Jamis, I think there’s an issue with a test on chapter 6. I own the ebook, version P1.0 Feb. 2019. This test doesn’t pass for me: ...
New
jdufour
Hello! On page xix of the preface, it says there is a community forum "… for help if your’re stuck on one of the exercises in this book… ...
New
JohnS
I can’t setup the Rails source code. This happens in a working directory containing multiple (postgres) Rails apps. With: ruby-3.0.0 s...
New
leonW
I ran this command after installing the sample application: $ cards add do something --owner Brian And got a file not found error: Fil...
New
s2k
Hi all, currently I wonder how the Tailwind colours work (or don’t work). For example, in app/views/layouts/application.html.erb I have...
New
a.zampa
@mfazio23 I’m following the indications of the book and arriver ad chapter 10, but the app cannot be compiled due to an error in the Bas...
New
mcpierce
@mfazio23 I’ve applied the changes from Chapter 5 of the book and everything builds correctly and runs. But, when I try to start a game,...
New
dachristenson
I just bought this book to learn about Android development, and I’m already running into a major issue in Ch. 1, p. 20: “Update activity...
New

Other popular topics Top

AstonJ
Or looking forward to? :nerd_face:
502 14279 275
New
Exadra37
I am thinking in building or buy a desktop computer for programing, both professionally and on my free time, and my choice of OS is Linux...
New
DevotionGeo
I know that -t flag is used along with -i flag for getting an interactive shell. But I cannot digest what the man page for docker run com...
New
AstonJ
Saw this on TikTok of all places! :lol: Anyone heard of them before? Lite:
New
Maartz
Hi folks, I don’t know if I saw this here but, here’s a new programming language, called Roc Reminds me a bit of Elm and thus Haskell. ...
New
foxtrottwist
A few weeks ago I started using Warp a terminal written in rust. Though in it’s current state of development there are a few caveats (tab...
New
PragmaticBookshelf
Programming Ruby is the most complete book on Ruby, covering both the language itself and the standard library as well as commonly used t...
New
PragmaticBookshelf
Leverage Elixir and the Nx ecosystem to build intelligent applications that solve real-world problems in computer vision, natural languag...
New
New
PragmaticBookshelf
Build modern server-driven web applications using htmx. Whatever programming language you use, you’ll write less (and cleaner) code. ...
New

Sub Categories: