Regardless of the predictability of automatic metric scores when evaluated with MAE, they unfortunately do not provide a suitable gold standard, simply because they are known to provide an insufficient substitute for human assessment, often unfairly penalizing translations that happen to be superficially dissimilar to reference translations (Callison-Burch et al., 2006).
the final values used to produce official results were W 1 = 1 and W 2 = 13.