Aligned Cross Entropy for Non-Autoregressive Machine Translation
Table 7: The effect of tuning the length multiplier λ on performance (BLEU), using the validation set.
['[BOLD] Length Multiplier', '[BOLD] WMT’14  [BOLD] EN-DE', '[BOLD] WMT’14  [BOLD] DE-EN', '[BOLD] WMT’16  [BOLD] EN-RO', '[BOLD] WMT’16  [BOLD] RO-EN']
Length Multiplier The length multiplier λ inflates the length predicted by a CMLM to account for extra blank tokens (ε) Using the best length multiplier increases the performance by 0.53 BLEU on average for WMT’14 EN-DE and WMT’16 EN-RO.