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1.新疆大学 软件学院 新疆智能计算与智慧应用重点实验室,新疆 乌鲁木齐 830091
2.新疆维吾尔自治区气象局 新疆兴农网信息中心,新疆 乌鲁木齐 830002
Received:18 January 2025,
Revised:2026-01-09,
Accepted:11 January 2026,
Published:25 March 2026
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杨兴耀,武彦孚,张祖莲,于炯,钟志强,陈羽.结合对比学习的细粒度长短期偏好序列推荐[J].新疆大学学报(自然科学版中英文),2026,43(2):156-168.
Yang Xingyao,Wu Yanfu,Zhang Zulian,Yu Jiong,Zhong Zhiqiang,Chen Yu.Fine-grained long and short-term preference sequential recommendation with contrastive learning[J].Journal of Xinjiang University(Natural Science Edition in Chinese and English),2026,43(2):156-168.
杨兴耀,武彦孚,张祖莲,于炯,钟志强,陈羽.结合对比学习的细粒度长短期偏好序列推荐[J].新疆大学学报(自然科学版中英文),2026,43(2):156-168. DOI: 10.13568/j.cnki.651094.651316.2025.01.18.0001.
Yang Xingyao,Wu Yanfu,Zhang Zulian,Yu Jiong,Zhong Zhiqiang,Chen Yu.Fine-grained long and short-term preference sequential recommendation with contrastive learning[J].Journal of Xinjiang University(Natural Science Edition in Chinese and English),2026,43(2):156-168. DOI: 10.13568/j.cnki.651094.651316.2025.01.18.0001.
序列推荐旨在
利用用户长短期偏好进行项目推荐,但大部分序列推荐系统面临学习力不足、长短期偏好融合不充分等问题.针对上述问题,本文提出一种基于对比学习的细粒度长期与短期偏好序列推荐方法.1)针对长短期偏好融合不充分的问题,提出长短期偏好学习层和长短期偏好融合层.首先,将用户行为序列分割为多段时间会话,并利用门控循环单元提取每段会话中用户的短期偏好,然后通过多头注意力机制融合短期偏好序列捕获用户长期偏好.最后,依据时间跨度自适应融合长期与短期偏好,从而获得更具代表性和全面性的偏好表示.2)针对数据稀疏导致学习力不足的问题,设计一种偏好表示对比学习任务,引入代理用户偏好进行对比学习,以实现更加精确的偏好推荐.结果表明:与次优方法相比,模型在3个公共数据集的
Hit
@20指标分别提高了9.84%、6.40%、1.52%,
MAP
@20指标分别提高了22.64%、2.42%、6.42%,证明本文所提方法的有效性.
Sequence recommendation aims at item recommendation using users' long and short-term preferences
but most sequence recommendation systems face problems such as insufficient learning power and inadequate fusion of long and short-term preferences. Aiming at the above problems
this paper proposes a fine-grained long and short-term preference sequence recommendation method based on contrastive learning. 1) To address the problem of insufficient long and short-term preference fusion
this paper proposes a long and short-term preference learning layer and a long and short-term preference fusion layer. Firstly
it splits the user behaviour sequence into multi-period sessions and extracts the user's short-term preference in each session by using gated recurrent units
and then fuses the short-term preference sequences to capture the user's long-term preference through the multi-head attention mechanism. Finally
the long-term and short-term preferences are fused adaptively based on the time span to obtain a more representative and comprehensive preference representation. 2) Aiming at the problem of insufficient learning power due to data sparsity
a preference representation comparison learning task is designed to introduce agent user preferences for comparison learning to achieve more accurate preference recommendation. The experimental results show that: compared to the sub-optimal methods
the model improves the
Hit
@20 metric by 9.84%
6.40%
and 1.52%
and the
MAP
@20 metric by 22.64%
2.42%
and 6.42% on three public datasets
respectively
demonstrating the effectiveness of the proposed method.
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