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Multilingual Neural Machine Translation with Knowledge Distillation

ICLR 2019 · Label-efficient and robust learning › Knowledge distillation · approach: Distillation for machine translation · 127 citations (OpenAlex)

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Measured effects reported in the paper

What was changedWhereMeasuredEffect
distill the multilingual model from individual teachersMulti-Baseline · IWSLT, 12 language pairsBLEU: +2.01Helped
distill the multilingual model from individual teachersMulti-Baseline · WMT, 6 language pairsBLEU: +1.55Helped
distill the multilingual model from individual teachersMultilingual baseline · Ted Talk, 44 languages→EnglishBLEU: 1.82Helped
use selective distillation instead of distilling all the time (ablation)Multilingual model · Ted Talk, 16 reported languagesBLEU: +1.11; +2.99; +2.10; +0.63; +1.62; +2.14; +1.29; +4.23; +4.88; +0.55; +1.15; +1.58; +2.17; -0.75; -0.54; -0.96Mixed
increase Top-K from 1 to 8 (ablation)Multilingual distillation · IWSLT De→En validationBLEU: 33.45 -> 34.76Helped
increase Top-K beyond 8, including using the full distribution (ablation)Multilingual distillation · IWSLT De→En validationBLEU: 34.76; 34.66; 34.68; 34.54; 34.47; 34.49No clear effect
add back distillation from the multilingual model to individual models (ablation)Individual models · IWSLT, 9 languages reportedBLEU: +0.20; +1.40; +0.64; +0.92; +0.36; +0.32; +1.18; +0.84; +1.11Helped
use sequence-level instead of word-level distillation (ablation)Multilingual model · IWSLT En→12 languagesBLEU: 1.01; 1.68; 0.87; 1.50; 0.53; 1.10; 1.36; 1.04; 0.10; 1.73; 0.61; 0.16Hurt

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