REQUIREs in `uq_ra_adf_iv` are too restrictive
_x.order() <= _measurements.parameterVectors[i].size()
This is too restrictive in the UQ setting. It requires the order of the tensor to be less than the order of the rank-one measurement. This does not take into account the fact that the first mode is reserved for the physical domain.
I propose to change the
REQUIRE condition to
_x.order() <= _measurements.parameterVectors[i].size()+1