3 Note that although the differences in BLEU scores are small, they end up being statistically significant because the models frequently yield the same top scoring realization, and reliably deliver improvements in the cases where they differ.
note that DEPLEN and DEPORD-NF agree on the best realization 81% of the time, while DEPLEN-NODIST and DEPORD-NODIST have 78.1% agreement, and DEPLEN-GLOBAL and GLOBAL show 77.4% agreement; by comparison, DEPORD-NODIST and GLOBAL only agree on the best realization 51.1% of the time.