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Efficient Attentions for Long Document Summarization

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arxiv 2104.02112 v2 pith:O5RQ5RNL submitted 2021-04-05 cs.CL

classification cs.CL
keywords efficientmodelsattentionsdocumentevaluationexistingheposlong
verification ladder T0 review T1 audit T2 compute T3 formal
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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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Cited by 18 Pith papers

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