DOCmT5: Document-Level Pretraining of Multilingual Language Models

Chia-Hsuan Lee,Aditya Siddhant,Viresh Ratnakar,Melvin Johnson

North American Chapter of the Association for Computational Linguistics (NAACL)（2022）CCF C

University of Washington ♠ Google Research

Cited 10|Views72

Abstract

In this paper, we introduce DOCmT5, a multilingual sequence-to-sequence language model pretrained with large scale parallel documents. While previous approaches have focused on leveraging sentence-level parallel data, we try to build a general-purpose pretrained model that can understand and generate long documents. We propose a simple and effective pretraining objective - Document reordering Machine Translation (DrMT), in which the input documents that are shuffled and masked need to be translated. DrMT brings consistent improvements over strong baselines on a variety of document-level generation tasks, including over 12 BLEU points for seen-language-pair document-level MT, over 7 BLEU points for unseen-language-pair document-level MT and over 3 ROUGE-1 points for seen-language-pair cross-lingual summarization. We achieve state-of-the-art (SOTA) on WMT20 De-En and IWSLT15 Zh-En document translation tasks. We also conduct extensive analysis on various factors for document pretraining, including (1) The effects of pretraining data quality and (2) The effects of combining mono-lingual and cross-lingual pretraining. We plan to make our model checkpoints publicly available.

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Key words

Neural Machine Translation,Multilingual Neural Machine Translation,Language Modeling,Syntax-based Translation Models,Machine Translation

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