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arXiv 1906.09404cs.CLcs.IR
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RLTM:一个高效的长文档神经IR框架

RLTM: An Efficient Neural IR Framework for Long Documents

Baidu Inc.(百度公司)

Chen Zheng, Yu Sun, Shengxian Wan, Dianhai Yu

摘要:

深度神经网络在信息检索(IR)方面取得了显著的进步。然而,大多数现有的模型是计算成本高,不能有效地扩展到长文档。本文提出了一种新的端到端的神经排序框架,称为增强长文本匹配(RLTM),匹配查询与长文档的效率和有效性。该框架的核心思想类似于人类的判断过程,首先从整个文档中快速定位相关部分,然后将这些部分与查询仔细匹配,以获得最终的标签。首先,我们从长文档中选择相关的句子,通过一个粗略的和有效的匹配模型。其次,我们生成一个更复杂的匹配模型的基础上选择的句子的相关性得分。通过最大化正例和负例之间的期望得分差距,以成对的方式与强化学习联合训练整个模型。实验结果表明,RLTM大大提高了现有模型的效率和有效性。

英文摘要:

Deep neural networks have achieved significant improvements in information retrieval (IR). However, most existing models are computational costly and can not efficiently scale to long documents. This paper proposes a novel End-to-End neural ranking framework called Reinforced Long Text Matching (RLTM) which matches a query with long documents efficiently and effectively. The core idea behind the framework can be analogous to the human judgment process which firstly locates the relevance parts quickly from the whole document and then matches these parts with the query carefully to obtain the final label. Firstly, we select relevant sentences from the long documents by a coarse and efficient matching model. Secondly, we generate a relevance score by a more sophisticated matching model based on the sentence selected. The whole model is trained jointly with reinforcement learning in a pairwise manner by maximizing the expected score gaps between positive and negative examples. Experimental results demonstrate that RLTM has greatly improved the efficiency and effectiveness of the state-of-the-art models.

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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