Beyond Error Propagation in Neural Machine Translation: Characteristics of Language Also Matter
Table 9: BLEU scores on the left-to-right and right-to-left translation sentences on the De-En test set, with RNN-based model. “Full” means the BLEU score of the whole translation sentence.
['[EMPTY]', '[BOLD] left-to-right', '[BOLD] right-to-left']
One may wonder whether the results in the paper are biased towards a certain model structure as we use Transformer on all the above analyses. The accuracy of the left half of the De-En translation sentence is always higher than the right half, in both the left-to-right and right-to-left decodings.