def _HasAncestor(self):
    return self.__has_ancestor
This function is called when no individual masks are present for the input
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/api/datastore.py/_BaseIndex._HasAncestor--crossover with--dataset/ETHPy150Open Mouse-Imaging-Centre/pydpiper/atoms_and_modules/LSQ6.py/NonUniformityCorrection.setupMaskArrayWithInitialModel