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The Ruby and Rails community linklog

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Unsupervised learning using k-means clustering in Ruby

The k-means clustering algorithm is a powerful unsupervised learning algorithm for clustering data. In this blog post I will show how to use the k-means algorithm in Ruby. I will walk through an example where I use the k-mean algorithm to divide California into a number of distribution territories, for my fictitious beer distribution business. You can read more here: http://www.practicalai.io/unsupervised-learning-using-k-means-clustering-in-ruby/

football.json - New 2017/18 Season - Free open public domain football data in JSON

Hello, I’ve updated the /football.json repo /service that offers (auto-)generated match schedules (fixtures and results) and club listings for the major football leagues e.g. English Premier League, Deutsche Bundesliga, Primera División, Italian Seria A, etc. See the 2017-18 season folder for (static) JSON examples. No API key required ;-) All data public domain. Enjoy the beautiful game. Cheers. PS: Ruby works great for generating JSON; see the json.rb script for the code.

Tips to improve speed of your test suite

At Appaloosa, most of our tests are written with Rspec, but we still have a certain amount of legacy Test Unit tests. Our Rspec and Test-Unit suites take up to 10 minutes each, so a full test suite runs in around 20 minutes. That’s a lot. We recently decided to invest time on improving our tests to gain time when developing.

The link is dead. The correct one: https://medium.com/appaloosa-store-engineeri…
Thanks. I’ve updated the link
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