Then, the total hypothesis length of the document is N hyp = k N hyp k and the total reference length is is defined as the length of the reference sentence with the lowest sentence-level error rate as shown to be optimal with respect to the correlation with the human evaluation score's adequacy and fluency (Leusch et al.
the noun reordering error Bush is not resolved by the POS-based reorderings of verbs, whereas it is at the correct position in the hierarchical system output.