Nice companion to <a href="http:&#x2F;&#x2F;www.r2d3.us&#x2F;visual-intro-to-machine-learning-part-1&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.r2d3.us&#x2F;visual-intro-to-machine-learning-part-1&#x2F;</a> which was posted on HN earlier!