We propose a query-based generative model for solving both tasks of question generation (QG) and question an- swering (QA). The model follows the classic encoder- decoder framework. The encoder takes a passage and a query as input then performs query understanding by matching the query with the passage from multiple per- spectives. The decoder is an attention-based Long Short Term Memory (LSTM) model with copy and coverage mechanisms. In the QG task, a question is generated from the system given the passage and the target answer, whereas in the QA task, the answer is generated given the question and the passage. During the training stage, we leverage a policy-gradient reinforcement learning algorithm to overcome exposure bias, a major prob- lem resulted from sequence learning with cross-entropy loss. For the QG task, our experiments show higher per- formances than the state-of-the-art results. When used as additional training data, the automatically generated questions even improve the performance of a strong ex- tractive QA system. In addition, our model shows bet- ter performance than the state-of-the-art baselines of the generative QA task.

我们提出了一种基于查询的生成模型，用于解决问题生成和问题回答两个任务， 在查询理解方面，该模型使用经典的编码器-解码器框架，通过与多个角度的文章进行匹配来执行查询理解。在进行培训时，我们利用政策梯度强化学习算法来克服暴露偏差，这是由于交叉熵损失的序列学习而引起的主要问题。

基于统一查询的生成模型，用于问题生成和问题回答