Tables 2, 3 and 4 show the BLEU performance of the selected subsets of the Zipporah system compared to the baseline, which selects sentence pairs at random; for comparison, we also give the BLEU performance of systems trained on Europarl.
table 4: BLEU Performance, Spanish-English for the Germen-English corpus, when selecting less than 2% of the data (10 million words), on the tED-talk dataset, Zipporah achieves a 5.5 BLEU score improvement over the baseline; by selecting less than 4% of the data (20 million words) the system gives better performance than using all data.