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unable to adjust grouping settings in OpenCV's hog.detectMultiScale (python)

I am trying to set the grouping settings in the hog.detectMultiScale method from the OpenCV2 library (version 2.4.9).

What happens is that the group_threshold and groupThreshold parameters are both not recognized in the python binding:

TypeError: 'group_threshold' is an invalid keyword argument for this function

and

TypeError: 'groupThreshold' is an invalid keyword argument for this function

How can I fix this? Is there a way to set this parameter?