hello, I have a question about [this function](https://github.com/Itseez/opencv/blob/master/apps/traincascade/old_ml_boost.cpp#L552).
It is supposed to find the best split of categorial variable.
I am not getting how does it work.
Especially, the part [here](https://github.com/Itseez/opencv/blob/master/apps/traincascade/old_ml_boost.cpp#L573) with double pointer.
Can somebody explain me this, please?
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