Multilingual BERT Post-Pretraining Alignment

• URL: http://arxiv.org/abs/2010.12547v2
• Date: Sat, 10 Apr 2021 15:24:26 GMT
• Title: Multilingual BERT Post-Pretraining Alignment
• Authors: Lin Pan, Chung-Wei Hang, Haode Qi, Abhishek Shah, Saloni Potdar, Mo Yu
• Abstract summary: We propose a simple method to align multilingual contextual embeddings as a post-pretraining step. Using parallel data, our method aligns embeddings on the word level through the recently proposed Translation Language Modeling objective. We also perform sentence-level code-switching with English when fine on downstream tasks.
• Score: 26.62198329830013
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We propose a simple method to align multilingual contextual embeddings as a post-pretraining step for improved zero-shot cross-lingual transferability of the pretrained models. Using parallel data, our method aligns embeddings on the word level through the recently proposed Translation Language Modeling objective as well as on the sentence level via contrastive learning and random input shuffling. We also perform sentence-level code-switching with English when finetuning on downstream tasks. On XNLI, our best model (initialized from mBERT) improves over mBERT by 4.7% in the zero-shot setting and achieves comparable result to XLM for translate-train while using less than 18% of the same parallel data and 31% less model parameters. On MLQA, our model outperforms XLM-R_Base that has 57% more parameters than ours.

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