基于文本答案融合与句法依存分析的问题生成模型

QUESTION GENERATION MODEL BASED ON CONTEXT ANSWER FUSION AND SYNTACTIC DEPENDENCY PARSING

  • 摘要: 先前的问题生成研究主要使用基于循环神经网络构建的seq2seq框架,忽略了答案信息和文本中蕴含的句法信息。为了解决上述问题,提出一种基于文本答案融合与句法依存分析的问题生成模型(ACFDP)。在编码阶段使用门控图卷积神经网络捕获文本的句法依存关系,同时利用互注意力耦合输入的文本和答案。模型通过关注答案信息和文本的句法依存关系来生成更贴近答案的高质量问句。此外,还利用强化学习进一步提升了模型的表现。在公开数据集SQuAD上的实验结果表明,该方法在评价指标BLEU-4和ROUGE-L上的表现优于基线模型。

     

    Abstract: Previous question generation studies mainly use sequence-to-sequence frameworks based on recurrent neural networks, which ignores the answer information and syntactic information hidden in the context. In order to solve the above problems, this paper proposes a question generation model based on context answer fusion and syntactic dependency parsing. In the encoding stage, syntactic dependency relation of the context was captured by gated graph convolutional network, meanwhile using the co-attention mechanism to align the input context and answer. The model generated high-quality questions that were close to the answer by paying attention to the answer information and syntactic dependency relation of the context. Moreover, this paper used reinforcement learning to further improve the model performance. The experimental results on the public dataset SQuAD show that the method outperforms the baseline model in terms of evaluation metrics BLEU-4 and ROUGE-L.

     

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