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arXiv · 2104.02112

Efficient Attentions for Long Document Summarization

Luyang Huang·Shuyang Cao·Nikolaus Parulian·Heng Ji·Lu Wang
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Abstract

The quadratic computational and memory complexities of large Transformers have limited their scalability for long document summarization. In this paper, we propose Hepos, a novel efficient encoder-decoder attention with head-wise positional strides to effectively pinpoint salient information from the source. We further conduct a systematic study of existing efficient self-attentions. Combined with Hepos, we are able to process ten times more tokens than existing models that use full attentions. For evaluation, we present a new dataset, GovReport, with significantly longer documents and summaries. Results show that our models produce significantly higher ROUGE scores than competitive comparisons, including new state-of-the-art results on PubMed. Human evaluation also shows that our models generate more informative summaries with fewer unfaithful errors.

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Luyang Huang, Shuyang Cao, Nikolaus Parulian, Heng Ji, Lu Wang. 2021-04-05. Efficient Attentions for Long Document Summarization. https://arxiv.org/abs/2104.02112

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