mLUKE: The Power of Entity Representations in Multilingual Pretrained Language Models

ACL 2022  ·  Ryokan Ri, Ikuya Yamada, Yoshimasa Tsuruoka ·

Recent studies have shown that multilingual pretrained language models can be effectively improved with cross-lingual alignment information from Wikipedia entities. However, existing methods only exploit entity information in pretraining and do not explicitly use entities in downstream tasks. In this study, we explore the effectiveness of leveraging entity representations for downstream cross-lingual tasks. We train a multilingual language model with 24 languages with entity representations and show the model consistently outperforms word-based pretrained models in various cross-lingual transfer tasks. We also analyze the model and the key insight is that incorporating entity representations into the input allows us to extract more language-agnostic features. We also evaluate the model with a multilingual cloze prompt task with the mLAMA dataset. We show that entity-based prompt elicits correct factual knowledge more likely than using only word representations. Our source code and pretrained models are available at https://github.com/studio-ousia/luke.

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Results from the Paper


 Ranked #1 on Cross-Lingual Question Answering on XQuAD (Average F1 metric, using extra training data)

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Task Dataset Model Metric Name Metric Value Global Rank Uses Extra
Training Data
Result Benchmark
Cross-Lingual Question Answering XQuAD mLUKE-E Average F1 74.2 # 1

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