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d2o: Contraction functions rely on non-degeneracy of distribution strategy
Several methods of the distributed_data_object rely on the fact, that the distribution strategy behaves as if the local data was non-degenerate. Currently the non-distributor fixes this by returning trivial (local) results in the _allgather and the _Allreduce_sum method.
Affected d2o methods are at least: _contraction_helper, mean
Fix: Move the functionality for sum, prod, etc... into the distributor.