Ad-hoc retrieval models with implicit feedback often have problems, e.g., the
imbalanced classes in the data set. Too few clicked documents may hurt
generalization ability of the models, whereas too many non-clicked documents
may harm effectiveness of the models and efficiency of training. In addition,
recent neural network-based models are vulnerable to adversarial examples due
to the linear nature in them. To solve the problems at the same time, we
propose an adversarial sampling and training framework to learn ad-hoc
retrieval models with implicit feedback. Our key idea is (i) to augment clicked
examples by adversarial training for better generalization and (ii) to obtain
very informational non-clicked examples by adversarial sampling and training.
Experiments are performed on benchmark data sets for common ad-hoc retrieval
tasks such as Web search, item recommendation, and question answering.
Experimental results indicate that the proposed approaches significantly
outperform strong baselines especially for high-ranked documents, and they
outperform IRGAN in NDCG@5 using only 5% of labeled data for the Web search
task.

本文提出一种针对 ad-hoc 检索模型的数据不平衡及神经网络模型易受对抗干扰等问题的对抗性采样和训练框架，通过增强点击示例和获得非常信息化的非点击示例来学习 ad-hoc 检索模型，并在常见 ad-hoc 检索任务（如网络搜索，项目推荐和问答）的基准数据集上进行实验，结果表明该方法在高排名文档方面显着优于强基线，并且在使用仅占 5％的已标记数据对 IRGAN 在 NDCG@5 上实现更好的表现。