一种基于CW-RNN的多时间尺度序列建模推荐算法

序列化推荐试图利用用户与物品的历史交互序列,预测下次即将交互的物品。针对序列化推荐中推荐物品依赖于用户的长时间全局兴趣、中时间兴趣还是短时间局部兴趣的不确定性,该文提出了一种基于CW-RNN的多时间尺度序列建模推荐算法。首先,该算法引入CW-RNN层,从用户与物品的历史交互序列中抽取多个时间尺度的用户兴趣特征。然后,通过尺度维卷积来建模对不同时间尺度的用户兴趣特征的依赖,生成多时间尺度用户兴趣特征的统一表示。最后,利用全连接层建模统一的多尺度用户兴趣特征和隐式物品特征的交互关系。在MovieLens-1M和Amazon Movies and TV两个公开数据集上的实验结果表明,相比于现有最优的序列推荐算法,该文提出的算法在准确率上分别提升了3.80%和8.63%。

A Multi-Scale Temporal Dynamic Model for Sequential Recommendation with Clockwork RNN

Sequential recommendation attempts to use the historical interaction sequence between users and items to predict the next item to interact with. A multi-scale temporal dynamic model for sequential recommendation with Clockwork RNN is proposed to solve the uncertainty of recommended items by the on users long-term global interest, medium time interest or short time local interest. Firstly, the CW-RNN layer is introduced to extract user’s multi-scale temporal interest features from the historical interaction sequence between users and items. The convolution with CNN on the time scale dimension is then used to learn the user’s interest dependency on different time scales, and generate the user’s unified interest representations. Finally, it uses the fully connected layer to model the interaction between the unified multi-scale user interest representations and item’s embedding representations. Experiments are carried out on MovieLens-1M and Amazon Movies and TV, two public datasets. The results show that our proposed model improves the accuracy by 3.80% and 8.63% respectively compared with the current optimal sequential recommendation algorithms.