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Using Perturbed Length-aware Positional Encoding for Non-autoregressive Neural Machine Translation

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arxiv 2107.13689 v1 pith:3E3NB2DW submitted 2021-07-29 cs.CL

Using Perturbed Length-aware Positional Encoding for Non-autoregressive Neural Machine Translation

classification cs.CL
keywords modeltranslationmachineneuraldistillationencodingknowledgelength-aware
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Non-autoregressive neural machine translation (NAT) usually employs sequence-level knowledge distillation using autoregressive neural machine translation (AT) as its teacher model. However, a NAT model often outputs shorter sentences than an AT model. In this work, we propose sequence-level knowledge distillation (SKD) using perturbed length-aware positional encoding and apply it to a student model, the Levenshtein Transformer. Our method outperformed a standard Levenshtein Transformer by 2.5 points in bilingual evaluation understudy (BLEU) at maximum in a WMT14 German to English translation. The NAT model output longer sentences than the baseline NAT models.

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