Steven Puttemans

That is indeed true, as you can see, added a PR to remove the declaration, since there is not a single function or module out there using it. If someone...

I am guessing that there is a reason for the removal. Probably the functionality is available in another form...

I guess that the for loop right [here](https://github.com/opencv/opencv/blob/master/modules/ml/src/rtrees.cpp#L178) allows for applying a parallel for. We only need to keep track somehow of which features are already taken by the process...

@lovaj all new functionality is useful and welcome in OpenCV, certainly when it relates to keypoint detectors and descriptors, which are being used in several applications. However you first shot...

I think @paroj is actually interested in what is so different in performance. If it is not extremely better, then why bother to integrate it.