Here, an old topic but keeps coming to me — machine learning. Java? Python? or R?

Let’s focus on some readings.

A guy posts decision making algorithm with implementation in python, 
of course!

He does not reply why data link is broken, which can be easily found 
here at kaggle competition site.

Here is a very simple tutorial about decision tree algorithm.

Another example here should be enough

Found another quite basic explanation

More on decision tree — iterative preorder traversal

Here is the first example

Decision Tree implementation

A simple python example.

Another guy provides smile  (Statistical Machine Intelligence and 
Learning Engine) package implemented in Java

A guy posts decision making algorithm with implementation in python, 
of course!