As one of the most popular classic machine learning algorithm, the Decision Tree is much more intuitive than the others for its explainability. In one of my previous article, I have introduced the basic idea and mechanism of a Decision Tree model. It demonstrated this machine learning model using an algorithm called ID3, which is one of the most classic ones for training a Decision Tree classification model.

If you are not that familiar with Decision Tree, it is highly recommended to check out the above article before reading into this one.

To intuitively understand Decision Trees, it is indeed good to start with ID3. However, it is probably not a good idea to use it in practice. In this article, I’ll introduce a commonly used algorithm to build Decision Tree models — C4.5.

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