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Domain Adaptive Inference for Neural Machine Translation

2 June 2019
Danielle Saunders
Felix Stahlberg
Adria de Gispert
Bill Byrne
    AI4CE
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Abstract

We investigate adaptive ensemble weighting for Neural Machine Translation, addressing the case of improving performance on a new and potentially unknown domain without sacrificing performance on the original domain. We adapt sequentially across two Spanish-English and three English-German tasks, comparing unregularized fine-tuning, L2 and Elastic Weight Consolidation. We then report a novel scheme for adaptive NMT ensemble decoding by extending Bayesian Interpolation with source information, and show strong improvements across test domains without access to the domain label.

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