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Pre-Trained Multilingual Sequence-to-Sequence Models: A Hope for Low-Resource Language Translation?

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arxiv 2203.08850 v3 pith:CWKTYJDN submitted 2022-03-16 cs.CL

classification cs.CL
keywords datalanguageslow-resourcembartmodelsamountdomainfine-tuning
verification ladder T0 review T1 audit T2 compute T3 formal
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What can pre-trained multilingual sequence-to-sequence models like mBART contribute to translating low-resource languages? We conduct a thorough empirical experiment in 10 languages to ascertain this, considering five factors: (1) the amount of fine-tuning data, (2) the noise in the fine-tuning data, (3) the amount of pre-training data in the model, (4) the impact of domain mismatch, and (5) language typology. In addition to yielding several heuristics, the experiments form a framework for evaluating the data sensitivities of machine translation systems. While mBART is robust to domain differences, its translations for unseen and typologically distant languages remain below 3.0 BLEU. In answer to our title's question, mBART is not a low-resource panacea; we therefore encourage shifting the emphasis from new models to new data.

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