Massively Parallel Cross-Lingual Learning in Low-Resource Target Language Translation
Table 7: Summary of order-preserving lexicon translation. G: training on Germanic family without using order-preserving method. OG: order-preserving lexicon translation. OG1: OG translation using lexicons with frequency 1. OGM: OG translation using lexicons with manual selection.
['expt', 'G', 'OG', 'OG1', 'OGM']
Trimming the lexicon list that keeps the tail helps to increase BLEU scores: Different from most of the previous lexiconized NMT works where BLEU scores never increase Wang et al. As an attempt to increase our BLEU scores even further, we conduct two more experiments. In one setting, we keep only the tail of the lexicon table that occur in the Bible once. In another setting, we keep only a manual selection of lexicons. Note that this is the only place where manual work is involved and is not essential. There are minor improvements in BLEU scores in both cases.