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arXiv 2212.08262cs.IRcs.LG
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均匀序列更佳:面向序列推荐的时间间隔感知数据增强

Uniform Sequence Better: Time Interval Aware Data Augmentation for Sequential Recommendation

Northeastern University(东北大学);Alibaba Group(阿里巴巴集团)

Yizhou Dang, Enneng Yang, Guibing Guo, Linying Jiang, Xingwei Wang, Xiaoxiao Xu, Qinghui Sun, Hong Liu

AI总结:

针对序列推荐中时间间隔不均导致的偏好漂移问题,提出五种时间间隔感知增强算子及长度控制策略,将非均匀序列转化为均匀序列,并在四个真实数据集上显著优于11种对比方法。

摘要:

序列推荐是一项基于已交互物品序列来预测下一个要访问物品的重要任务。大多数现有工作将用户偏好学习为从前一个物品到下一个物品的转移模式,而忽略了这两个物品之间的时间间隔。然而,我们观察到序列中的时间间隔可能存在显著差异,并会因“偏好漂移”问题导致用户建模失效。事实上,我们开展了一项实证研究来验证这一观察,发现时间间隔均匀分布的序列(记为均匀序列)比时间间隔差异很大的序列更有利于性能提升。因此,我们提出从时间间隔的角度增强序列数据,这在现有文献中尚未被研究。具体而言,我们设计了五个算子(Ti-Crop、Ti-Reorder、Ti-Mask、Ti-Substitute、Ti-Insert),在考虑时间间隔方差的情况下,将原始非均匀序列转换为均匀序列。随后,我们设计了一种控制策略,以对不同长度的物品序列执行数据增强。最后,我们在先进模型 CoSeRec 上实现这些改进,并在四个真实数据集上验证了所提方法。实验结果表明,与其他11种竞争方法相比,我们的方法取得了显著更优的性能。我们的实现可在 https://github.com/KingGugu/TiCoSeRec 获取。

英文摘要:

Sequential recommendation is an important task to predict the next-item to access based on a sequence of interacted items. Most existing works learn user preference as the transition pattern from the previous item to the next one, ignoring the time interval between these two items. However, we observe that the time interval in a sequence may vary significantly different, and thus result in the ineffectiveness of user modeling due to the issue of \emph{preference drift}. In fact, we conducted an empirical study to validate this observation, and found that a sequence with uniformly distributed time interval (denoted as uniform sequence) is more beneficial for performance improvement than that with greatly varying time interval. Therefore, we propose to augment sequence data from the perspective of time interval, which is not studied in the literature. Specifically, we design five operators (Ti-Crop, Ti-Reorder, Ti-Mask, Ti-Substitute, Ti-Insert) to transform the original non-uniform sequence to uniform sequence with the consideration of variance of time intervals. Then, we devise a control strategy to execute data augmentation on item sequences in different lengths. Finally, we implement these improvements on a state-of-the-art model CoSeRec and validate our approach on four real datasets. The experimental results show that our approach reaches significantly better performance than the other 11 competing methods. Our implementation is available: https://github.com/KingGugu/TiCoSeRec.

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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