I can't properly set the bob.learn.activation.Activation in linear Machines

Hey guys,

Another python binding issue.

So I have extended bob.learn.activation.Activation on the python side like this:

from ._library import Logistic as _Logistic_C
class Logistic(_Logistic_C):
    def my_cool_python_method(self):
        pass

I can't properly set the following object act = Logistic() in bob.learn.linear.Machine.activation.

For instance, if I do

activation = Logistic() # This the python extended version
activation.my_cool_python_method # this method exists

machine = bob.learn.linear.Machine()
machine.activation = activation
machine.activation.my_cool_python_method # This method does not exists

How can I solve this?

Thanks

ping @andre.anjos