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C# Shoematt. Chris Smith's completely unique view : Awesome F# - Decision Tre. In my previous post I went over the theory behind the ID3 algorithm.
Now that we got all that painful math out of the way, let’s write some code! Here is an implementation of the algorithm in F#. (It is also attached to this blog post, download it via the link at the bottom.) The entropy and informationGain functions were covered in my last post, so let’s walk through how the actual decision tree gets constructed. There’s a little work to calculating the optimal decision tree split, but with F# you can express it quite beautifully.