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arXiv 2310.12640cs.CL
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非自回归句子排序

Non-Autoregressive Sentence Ordering

National University of Singapore(新加坡国立大学);University of Electronic Science and Technology of China(电子科技大学);The Hong Kong University of Science and Technology(香港科技大学);The Hong Kong Polytechnic University(香港理工大学)

Yi Bin, Wenhao Shi, Bin Ji, Jipeng Zhang, Yujuan Ding, Yang Yang

AI总结:

本文提出非自回归排序网络NAON,通过并行预测和双向依赖解决传统自回归句子排序的局限,并引入排他性损失优化Transformer重复问题,实验证明其优于自回归方法且性能具竞争力。

摘要:

现有的句子排序方法通常采用带有指针网络的编码器-解码器框架,通过逐步循环预测每个句子来恢复连贯性。这种自回归方式在解码过程中仅利用单向依赖关系,无法充分探索句子之间的语义依赖关系以进行排序。为了克服这些局限性,本文提出了一种新颖的非自回归排序网络,简称NAON,它探索句子之间的双向依赖关系,并并行预测每个位置的句子。我们声称,非自回归方式不仅适用于句子排序任务,而且由于该任务的两个独特特性而特别适合:1)每个生成目标具有确定的长度,2)句子和位置应排他性地匹配。此外,为了解决朴素非自回归Transformer的重复问题,我们引入了排他性损失来约束位置和句子之间的排他性。为了验证所提出模型的有效性,我们在几个常用数据集上进行了广泛实验,实验结果表明,我们的方法优于所有自回归方法,并与最先进的方法相比具有竞争力的性能。代码可在https://github.com/steven640pixel/nonautoregressive-sentence-ordering获取。

英文摘要:

Existing sentence ordering approaches generally employ encoder-decoder frameworks with the pointer net to recover the coherence by recurrently predicting each sentence step-by-step. Such an autoregressive manner only leverages unilateral dependencies during decoding and cannot fully explore the semantic dependency between sentences for ordering. To overcome these limitations, in this paper, we propose a novel Non-Autoregressive Ordering Network, dubbed \textit{NAON}, which explores bilateral dependencies between sentences and predicts the sentence for each position in parallel. We claim that the non-autoregressive manner is not just applicable but also particularly suitable to the sentence ordering task because of two peculiar characteristics of the task: 1) each generation target is in deterministic length, and 2) the sentences and positions should match exclusively. Furthermore, to address the repetition issue of the naive non-autoregressive Transformer, we introduce an exclusive loss to constrain the exclusiveness between positions and sentences. To verify the effectiveness of the proposed model, we conduct extensive experiments on several common-used datasets and the experimental results show that our method outperforms all the autoregressive approaches and yields competitive performance compared with the state-of-the-arts. The codes are available at: \url{https://github.com/steven640pixel/nonautoregressive-sentence-ordering}.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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