One-to-Many Multilingual End-to-End Speech Translation
Table 4: Comparison of the Baseline and the best multilingual system with the single language cascade (BL-Cascade) and the multilingual cascade (M-Cascade)
['[EMPTY]', 'De', 'Nl', 'Es', 'Fr', 'It', 'Pt']
Comparison with cascade. As expected, our direct SLT baselines are significantly worse than the BL-cascade systems with differences that range from −1.0 for French to −3.4 for Dutch. Comparing the BL-Cascade with the M-Cascade systems, we observe not significant variation for the Germanic languages, but lower results in 3 out of 4 Romance languages (−0.6 for French), with the single improvement of +1.3 for Portuguese. Thus, multilingual MT generally affects negatively the performance, being beneficial only for the lowest resourced languages.