异构信息网络(Heterogeneous Information Network, HIN)凭借其丰富的语义信息和结构信息被广泛应用于推荐系统中,虽然取得了很好的推荐效果,但较少考虑局部特征放大、信息交互和多嵌入聚合等问题。针对这些问题,提出了一种新的用于top-...异构信息网络(Heterogeneous Information Network, HIN)凭借其丰富的语义信息和结构信息被广泛应用于推荐系统中,虽然取得了很好的推荐效果,但较少考虑局部特征放大、信息交互和多嵌入聚合等问题。针对这些问题,提出了一种新的用于top-N推荐的多嵌入融合推荐(Multi-embedding Fusion Recommendation, MFRec)模型。首先,该模型在用户和项目学习分支中都采用对象上下文表示网络,充分利用上下文信息以放大局部特征,增强相邻节点的交互性;其次,将空洞卷积和空间金字塔池化引入元路径学习分支,以便获取多尺度信息并增强元路径的节点表示;然后,采用多嵌入融合模块以便更好地进行用户、项目以及元路径的嵌入融合,细粒度地进行多嵌入之间的交互学习,并强调了各特征的不同重要性程度;最后,在两个公共推荐系统数据集上进行了实验,结果表明所提模型MFRec优于现有的其他top-N推荐系统模型。展开更多
经典的Top-N推荐算法利用用户正反馈信息对全部项目进行排序,然后选择前N个项目推荐给用户.针对经典推荐算法未充分利用用户负反馈信息的问题,提出基于正负反馈的SVM协同过滤(SVM Collaborative Filtering based on Positive and Negati...经典的Top-N推荐算法利用用户正反馈信息对全部项目进行排序,然后选择前N个项目推荐给用户.针对经典推荐算法未充分利用用户负反馈信息的问题,提出基于正负反馈的SVM协同过滤(SVM Collaborative Filtering based on Positive and Negative Feedback,PNF-SVMCF)Top-N推荐算法,充分利用用户负反馈信息过滤测试集中用户可能不喜欢的项目,只对测试集中剩余的项目进行Top-N排序.PNF-SVMCF算法过滤用户可能不喜欢的项目,这样可以缩减需要排序的项目规模,提升推荐效率;同时去除这些项目对排序的干扰,提高推荐精度.在MovieLens数据集上的实验结果表明,该方法具有良好的推荐速度和精度,特别是在较少的推荐项目情况下,能够表现出更好的推荐精度.展开更多
[目的/意义]为缓解信息过载问题,本文提出一种基于时间和自适应TOP-N的图书推荐算法--RTAT(Book recommendation based on Rating and Time and Adaptive Top-N Algorithm),能够对用户邻居群体进行更为准确地划分,对提高图书推荐系统服...[目的/意义]为缓解信息过载问题,本文提出一种基于时间和自适应TOP-N的图书推荐算法--RTAT(Book recommendation based on Rating and Time and Adaptive Top-N Algorithm),能够对用户邻居群体进行更为准确地划分,对提高图书推荐系统服务质量具有重大意义。[方法/过程]TOP-N算法是推荐系统中的一个关键算法,然而传统TOP-N算法在对图书用户进行邻居选取时并未考虑邻居间的相互性。本文就传统TOP-N算法进行改进--在进行近邻选取时,将相互性作为一个重要筛选条件,利用近邻集对用户进行图书推荐。[结果/结论]对真实图书评分数据进行算法检验的结果表明,在考虑时间因素下,RTAT算法的图书推荐系统的准确率为87.2%,相较于传统TOP-N算法提高了10.8%。RTAT算法能够获取更为合理的邻居关系,并达到提升推荐系统性能的目的。展开更多
Recently there has been an increasing interest in applying random walk based methods to recommender systems. We employ a Gaussian random field to model the top-N recommendation task as a semi-supervised learning probl...Recently there has been an increasing interest in applying random walk based methods to recommender systems. We employ a Gaussian random field to model the top-N recommendation task as a semi-supervised learning problem, taking into account the degree of each node on the user-item bipartite graph, and induce an effective absorbing random walk (ARW) algorithm for the top-N recommendation task. Our random walk approach directly generates the top-N recommendations for individuals, rather than predicting the ratings of the recommendations. Experimental results on the two real data sets show that our random walk algorithm significantly outperforms the state-of-the-art random walk based personalized ranking algorithm as well as the popular item-based collaborative filtering method.展开更多
Recent years have witnessed the ever-growing popularity of location-based social network （LBSN） services. Top-N place recommendation, which aims at retrieving N most appealing places for a target user, has thus gain...Recent years have witnessed the ever-growing popularity of location-based social network （LBSN） services. Top-N place recommendation, which aims at retrieving N most appealing places for a target user, has thus gained increasing importance. Yet existing solutions to this problem either provide non-personalized recommendations by selecting nearby popular places, or resort to collaborative filtering （CF） by treating each place as an independent item, overlooking the geographical and semantic correlations among places. In this paper, we propose GoTo, a collaborative recommender that provides top-N personalized place recommendation in LBSNs. Compared with existing nlethods, GoTo achieves its effectiveness by exploiting the wisdom of the so-called local experts, namely those who are geographically close and have similar preferences with regard to a certain user. At the core of GoTo lies a novel user similarity measure called geo-topical similarity, which combines geographical and semantic correlations among places for discovering local experts. In specific, the geo-topical similarity uses Gaussian mixtures to model users＇ real-life geographical patterns, and extracts users＇ topical preferences from the attached tags of historically visited places. Extensive experiments on real LBSN datasets show that compared with baseline methods, GoTo can improve the performance of towN place recommendation by up to 50% in terms of accuracy.展开更多
新零售带动传统企业转型,加速了以实体门店作为前置仓的线上订单履行模式的发展。针对订单需求不确定导致的就近门店无法满足订单需求的情况,提出多门店协同下的订单拆分与配送的联合优化问题。通过引入拆单数量限制,缩减问题求解空间,...新零售带动传统企业转型,加速了以实体门店作为前置仓的线上订单履行模式的发展。针对订单需求不确定导致的就近门店无法满足订单需求的情况,提出多门店协同下的订单拆分与配送的联合优化问题。通过引入拆单数量限制,缩减问题求解空间,同时为了减少单独配送导致的路径重叠,采用协同配送的模式整合路径,并通过订单拆分与配送之间的调整优化降低订单履行成本。集成广度优先搜索和局部搜索算法,构造TNILS(top-N&improved local search)混合启发式算法求解问题。在合成数据集的基础上,通过协同配送与单独配送的结果对比,证明了协同配送的有效性及提出算法的可行性。通过与其他算法的实验结果对比,验证TNILS算法的有效性和稳定性。展开更多
文摘经典的Top-N推荐算法利用用户正反馈信息对全部项目进行排序,然后选择前N个项目推荐给用户.针对经典推荐算法未充分利用用户负反馈信息的问题,提出基于正负反馈的SVM协同过滤(SVM Collaborative Filtering based on Positive and Negative Feedback,PNF-SVMCF)Top-N推荐算法,充分利用用户负反馈信息过滤测试集中用户可能不喜欢的项目,只对测试集中剩余的项目进行Top-N排序.PNF-SVMCF算法过滤用户可能不喜欢的项目,这样可以缩减需要排序的项目规模,提升推荐效率;同时去除这些项目对排序的干扰,提高推荐精度.在MovieLens数据集上的实验结果表明,该方法具有良好的推荐速度和精度,特别是在较少的推荐项目情况下,能够表现出更好的推荐精度.
文摘[目的/意义]为缓解信息过载问题,本文提出一种基于时间和自适应TOP-N的图书推荐算法--RTAT(Book recommendation based on Rating and Time and Adaptive Top-N Algorithm),能够对用户邻居群体进行更为准确地划分,对提高图书推荐系统服务质量具有重大意义。[方法/过程]TOP-N算法是推荐系统中的一个关键算法,然而传统TOP-N算法在对图书用户进行邻居选取时并未考虑邻居间的相互性。本文就传统TOP-N算法进行改进--在进行近邻选取时,将相互性作为一个重要筛选条件,利用近邻集对用户进行图书推荐。[结果/结论]对真实图书评分数据进行算法检验的结果表明,在考虑时间因素下,RTAT算法的图书推荐系统的准确率为87.2%,相较于传统TOP-N算法提高了10.8%。RTAT算法能够获取更为合理的邻居关系,并达到提升推荐系统性能的目的。
基金Project supported by the National Natural Science Foundation of China (Nos. 60525108 and 60533090)the National Hi-Tech Research and Development Program (863) of China (No. 2006AA010107)the Program for Changjiang Scholars and Innovative Research Team in University, China (No. IRT0652)
文摘Recently there has been an increasing interest in applying random walk based methods to recommender systems. We employ a Gaussian random field to model the top-N recommendation task as a semi-supervised learning problem, taking into account the degree of each node on the user-item bipartite graph, and induce an effective absorbing random walk (ARW) algorithm for the top-N recommendation task. Our random walk approach directly generates the top-N recommendations for individuals, rather than predicting the ratings of the recommendations. Experimental results on the two real data sets show that our random walk algorithm significantly outperforms the state-of-the-art random walk based personalized ranking algorithm as well as the popular item-based collaborative filtering method.
基金This work is supported by the National Natural Science Foundation of China under Grant No. M1552002 and the National High Technology Research and Development Program of China under Grant No. 2014AA015205.
文摘Recent years have witnessed the ever-growing popularity of location-based social network （LBSN） services. Top-N place recommendation, which aims at retrieving N most appealing places for a target user, has thus gained increasing importance. Yet existing solutions to this problem either provide non-personalized recommendations by selecting nearby popular places, or resort to collaborative filtering （CF） by treating each place as an independent item, overlooking the geographical and semantic correlations among places. In this paper, we propose GoTo, a collaborative recommender that provides top-N personalized place recommendation in LBSNs. Compared with existing nlethods, GoTo achieves its effectiveness by exploiting the wisdom of the so-called local experts, namely those who are geographically close and have similar preferences with regard to a certain user. At the core of GoTo lies a novel user similarity measure called geo-topical similarity, which combines geographical and semantic correlations among places for discovering local experts. In specific, the geo-topical similarity uses Gaussian mixtures to model users＇ real-life geographical patterns, and extracts users＇ topical preferences from the attached tags of historically visited places. Extensive experiments on real LBSN datasets show that compared with baseline methods, GoTo can improve the performance of towN place recommendation by up to 50% in terms of accuracy.
文摘新零售带动传统企业转型,加速了以实体门店作为前置仓的线上订单履行模式的发展。针对订单需求不确定导致的就近门店无法满足订单需求的情况,提出多门店协同下的订单拆分与配送的联合优化问题。通过引入拆单数量限制,缩减问题求解空间,同时为了减少单独配送导致的路径重叠,采用协同配送的模式整合路径,并通过订单拆分与配送之间的调整优化降低订单履行成本。集成广度优先搜索和局部搜索算法,构造TNILS(top-N&improved local search)混合启发式算法求解问题。在合成数据集的基础上,通过协同配送与单独配送的结果对比,证明了协同配送的有效性及提出算法的可行性。通过与其他算法的实验结果对比,验证TNILS算法的有效性和稳定性。
