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arXiv 2209.07258cs.CL
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基于动态结构剪枝的图文生成

Graph-to-Text Generation with Dynamic Structure Pruning

Institute of Information Engineering, Chinese Academy of Sciences(中国科学院信息工程研究所);School of Cyber Security, University of Chinese Academy of Sciences(中国科学院大学网络空间安全学院);DAMO Academy, Alibaba Group(阿里巴巴集团达摩院)

Liang Li, Ruiying Geng, Bowen Li, Can Ma, Yinliang Yue, Binhua Li, Yongbin Li

摘要:

大多数图转文作品都是建立在具有交叉注意力机制的编码器-解码器框架之上。最近的研究表明,显式建模的输入图结构可以显着提高性能。然而,香草结构编码器不能在单个前向传递中捕获所有解码步骤的所有专用信息,从而导致不准确的语义表示。同时,在交叉注意中,输入图被展平为一个无序序列,忽略了原始图的结构。结果,解码器中获得的输入图上下文向量可能有缺陷。为了解决这些问题,我们提出了一个结构感知的交叉注意(SACA)机制重新编码的输入图表示条件的新生成的上下文在每个解码步骤中的结构感知的方式。我们进一步适应SACA,并引入其变体动态图修剪(DGP)机制,在解码过程中动态删除不相关的节点。我们在两个图形到文本数据集LDC 2020 T02和ENT-DESC上实现了新的最先进的结果,计算成本只有轻微的增加。

英文摘要:

Most graph-to-text works are built on the encoder-decoder framework with cross-attention mechanism. Recent studies have shown that explicitly modeling the input graph structure can significantly improve the performance. However, the vanilla structural encoder cannot capture all specialized information in a single forward pass for all decoding steps, resulting in inaccurate semantic representations. Meanwhile, the input graph is flatted as an unordered sequence in the cross attention, ignoring the original graph structure. As a result, the obtained input graph context vector in the decoder may be flawed. To address these issues, we propose a Structure-Aware Cross-Attention (SACA) mechanism to re-encode the input graph representation conditioning on the newly generated context at each decoding step in a structure aware manner. We further adapt SACA and introduce its variant Dynamic Graph Pruning (DGP) mechanism to dynamically drop irrelevant nodes in the decoding process. We achieve new state-of-the-art results on two graph-to-text datasets, LDC2020T02 and ENT-DESC, with only minor increase on computational cost.

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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