One Question Answering Model for Many Languages with Cross-lingual Dense Passage Retrieval

• URL: http://arxiv.org/abs/2107.11976v1
• Date: Mon, 26 Jul 2021 06:02:54 GMT
• Title: One Question Answering Model for Many Languages with Cross-lingual Dense Passage Retrieval
• Authors: Akari Asai, Xinyan Yu, Jungo Kasai, Hannaneh Hajishirzi
• Abstract summary: CORA is a Cross-lingual Open-Retrieval Answer Generation model. It can answer questions across many languages even when language-specific annotated data or knowledge sources are unavailable.
• Score: 39.061900747689094
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We present CORA, a Cross-lingual Open-Retrieval Answer Generation model that can answer questions across many languages even when language-specific annotated data or knowledge sources are unavailable. We introduce a new dense passage retrieval algorithm that is trained to retrieve documents across languages for a question. Combined with a multilingual autoregressive generation model, CORA answers directly in the target language without any translation or in-language retrieval modules as used in prior work. We propose an iterative training method that automatically extends annotated data available only in high-resource languages to low-resource ones. Our results show that CORA substantially outperforms the previous state of the art on multilingual open question answering benchmarks across 26 languages, 9 of which are unseen during training. Our analyses show the significance of cross-lingual retrieval and generation in many languages, particularly under low-resource settings.

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