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How did you improve it?

Adjusting rolling speed and changing the shape functions of some attributes.

What is rolling speed and shape functions

Rolling speed is part of his moving average algorithm, basically how much new values supersede older ones based on time.

I assume shape functions here he means the shape of the kernel function he uses.

Close. The shape functions are the nonlinear scalings I do on attributes before adding them to the tree.

Oooh, that makes more sense. :)

Shape functions are part of the distance function then.