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

telemachus
Python Testing With Pytest - Chapter 2, warnings for “unregistered custom marks” While running the smoke tests in Chapter 2, I get these...
New
ianwillie
Hello Brian, I have some problems with running the code in your book. I like the style of the book very much and I have learnt a lot as...
New
sdmoralesma
Title: Web Development with Clojure, Third Edition - migrations/create not working: p159 When I execute the command: user=&gt; (create-...
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
herminiotorres
Hi! I know not the intentions behind this narrative when called, on page XI: mount() |&gt; handle_event() |&gt; render() but the correc...
New
HarryDeveloper
Hi @venkats, It has been mentioned in the description of ‘Supervisory Job’ title that 2 things as mentioned below result in the same eff...
New
jgchristopher
“The ProductLive.Index template calls a helper function, live_component/3, that in turn calls on the modal component. ” Excerpt From: Br...
New
akraut
The markup used to display the uploaded image results in a Phoenix.LiveView.HTMLTokenizer.ParseError error. lib/pento_web/live/product_l...
New
andreheijstek
After running /bin/setup, the first error was: The foreman' command exists in these Ruby versions: That was easy to fix: gem install fore...
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

Devtalk
Hello Devtalk World! Please let us know a little about who you are and where you’re from :nerd_face:
New
DevotionGeo
I know that these benchmarks might not be the exact picture of real-world scenario, but still I expect a Rust web framework performing a ...
New
AstonJ
You might be thinking we should just ask who’s not using VSCode :joy: however there are some new additions in the space that might give V...
New
AstonJ
I’ve been hearing quite a lot of comments relating to the sound of a keyboard, with one of the most desirable of these called ‘thock’, he...
New
PragmaticBookshelf
Rust is an exciting new programming language combining the power of C with memory safety, fearless concurrency, and productivity boosters...
New
Exadra37
I am asking for any distro that only has the bare-bones to be able to get a shell in the server and then just install the packages as we ...
New
New
AstonJ
If you want a quick and easy way to block any website on your Mac using Little Snitch simply… File &gt; New Rule: And select Deny, O...
New
First poster: bot
zig/http.zig at 7cf2cbb33ef34c1d211135f56d30fe23b6cacd42 · ziglang/zig. General-purpose programming language and toolchain for maintaini...
New
PragmaticBookshelf
A concise guide to MySQL 9 database administration, covering fundamental concepts, techniques, and best practices. Neil Smyth MySQL...
New

Sub Categories: