Currently the MPISolverWrappercalls directly the loss function in the blackbox. (https://phabricator.mitk.org/source/observed-hyppopy/browse/master/hyppopy/solvers/MPISolverWrapper.py$111-114)
try: loss = self._solver.blackbox.blackbox_func(params) except: loss = self._solver.blackbox.blackbox_func(**params)
It is unclear to me why id did it that way, and not just called blackbox.call() aka blackbox().
The direct call of the blackbox_func misses i.a. the passing of data if set in the blackbox. Further it is redundant code, as the blackbox.call() also checks for several blackbox_func signatures.
We should discuss and check if it does make sense like it is now. I have the feeling changing it would make much sense. (At least I currently see now argument against it.)