A Multifaceted Evaluation of Neural versus Phrase-Based Machine Translation for 9 Language Directions
Table 3: Average of the overlaps between pairs of outputs produced by the top n NMT and PBMT systems for each language direction from English to the target language (TL). The higher the value, the larger is the overlap.
['[BOLD] TL', '[BOLD] 2 NMT', '[BOLD] 2 PBMT', '[BOLD] NMT & PBMT']
We can observe the same trends for all the language directions, namely: (i) the highest overlaps are between pairs of PBMT systems; (ii) next, we have overlaps between NMT systems; (iii) finally, overlaps between PBMT and NMT are the lowest.