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Calculates the overlap between two tensors as their scalar product.
References prod(), and syten::YesNo< struct _prod_conj >::y().
Referenced by do_expval(), eigenDavidson(), get_result(), syten::Pyten::init_tensor(), isParallel(), syten::MPS::normSqd(), orthogonalise(), orthogonalise_arithmetic_imp(), orthogonalise_inplace(), orthogonalise_run(), and orthogonalise_solve_svd().