Personalized topic-based tag recommendation

More and more content on the Web is generated by users. To organize this information and make it accessible via current search technology, tagging systems have gained tremendous popularity. Especially for multimedia content they allow to annotate resources with keywords (tags) which opens the door for classic text-based information retrieval. To support the user in choosing the right keywords, tag recommendation algorithms have emerged. In this setting, not only the content is decisive for recommending relevant tags but also the user's preferences.In this paper we introduce an approach to personalized tag recommendation that combines a probabilistic model of tags from the resource with tags from the user. As models we investigate simple language models as well as Latent Dirichlet Allocation. Extensive experiments on a real world dataset crawled from a big tagging system show that personalization improves tag recommendation, and our approach significantly outperforms state-of-the-art approaches.     

A Review of Ontology‐Based Tag Recommendation Approaches

Tag recommender schemes suggest related tags for an untagged resource and better tag suggestions to tagged resources. Tagging is very important if the user identifies the tag that is more precise to use in searching interesting blogs. There is no clear information regarding the meaning of each tag in a tagging process. An user can use various tags for the same content, and he can also use new tags for an item in a blog. When the user selects tags, the resultant metadata may comprise homonyms and synonyms. This may cause an improper relationship among items and ineffective searches for topic information. The collaborative tag recommendation allows a set of freely selected text keywords as tags assigned by users. These tags are imprecise, irrelevant, and misleading because there is no control over the tag assignment. It does not follow any formal guidelines to assist tag generation, and tags are assigned to resources based on the knowledge of the users. This causes misspelled tags, multiple tags with the same meaning, bad word encoding, and personalized words without common meaning. This problem leads to miscategorization of items, irrelevant search results, wrong prediction, and their recommendations. Tag relevancy can be judged only by a specific user. These aspects could provide new challenges and opportunities to its tag recommendation problem. This paper reviews the challenges to meet the tag recommendation problem. A brief comparison between existing works is presented, which we can identify and point out the novel research directions. The overall performance of our ontology‐based recommender systems is favorably compared to other systems in the literature.     

Tag recommendation method in folksonomy based on user tagging status

A folksonomy consists of three basic entities, namely users, tags and resources. This kind of social tagging system is a good way to index information, facilitate searches and navigate resources. The main objective of this paper is to present a novel method to improve the quality of tag recommendation. According to the statistical analysis, we find that the total number of tags used by a user changes over time in a social tagging system. Thus, this paper introduces the concept of user tagging status, namely the growing status, the mature status and the dormant status. Then, the determining user tagging status algorithm is presented considering a user’s current tagging status to be one of the three tagging status at one point. Finally, three corresponding strategies are developed to compute the tag probability distribution based on the statistical language model in order to recommend tags most likely to be used by users. Experimental results show that the proposed method is better than the compared methods at the accuracy of tag recommendation.     

标签扩展的协同过滤推荐算法

大多数利用标签与用户和项目之间关系的推荐算法,都要面临用户个体不同所导致的标签稀疏问题,不同的用户为项目所标注的标签会有所不同.针对由于用户标注标签的随意性而导致的用户标签和项目标签矩阵稀疏问题,提出了一种标签扩展的协同过滤推荐算法.该算法根据用户标注标签的行为计算基于标签的标签相似度,根据用户标注的标签语义计算基于标签语义的标签相似度,从用户行为和标签语义2个方面评估标签的相似度,并利用标签相似度来扩展每个项目标签,降低由项目与标签的关联关系产生的矩阵稀疏度.在M ovieLens数据集上的实验结果表明,所提算法在精度上有所提高.     

基于协同过滤和标签的混合音乐推荐算法研究

结合音乐这一特定的推荐对象,针对传统单一的推荐算法不能有效解决音乐推荐中的准确度问题,提出一种协同过滤技术和标签相结合的音乐推荐算法。该算法先通过协同过滤技术确定相似用户,再通过相似用户对某一歌手的标签评分预测另一用户对该歌手的偏好程度,从而选择更符合用户喜好的音乐进行推荐,以此提升个性化推荐效率,为优化音乐推荐系统提供参考方法。     

基于LDA的隐式标签协同过滤推荐算法

固定标签协同过滤推荐算法,未充分考虑标签因子的多样化,主要依靠人工标记,扩展性不强,主观因素多。本文从用户的喜好特征因素角度出发,在固定标签协同过滤推荐算法的基础上,提出一种隐式标签协同过滤推荐算法。该算法利用LDA主题模型生成项目文本的隐式标签,得到项目-标签特征权重,根据算法性能优化的要求选择标签数量,将项目-标签矩阵与用户评分矩阵结合得到用户对标签的偏好矩阵,最后通过协同过滤算法产生推荐。实验结果表明,本文提出的基于LDA的隐式标签协同过滤推荐算法缓解了数据稀疏性问题,项目推荐的召回率、准确度和F1值有较大提升。     

融合主题与语言模型的个性化标签推荐方法研究

随着Web的推广和普及,产生了越来越多的网络数据。 广泛应用了 标签系统 ,以便人们使用搜索技术来组织和使用这些信息。这些数据允许用户使用关键字(标签)注释资源,为传统的基于文本的信息检索提供了方案。为了支持用户选择正确的关键字,标签推荐算法应运而生。提出了一种个性化标签推荐方法,该方法综合了用户的资源标签与标签概率模型。该模型利用了简单语言模型和隐含狄利克雷分配模型,并针对现实世界的大型数据集进行了大量实验。实验表明,该个性化方法改进了标签推荐算法,推荐结果优于传统方法。     

Swallow: Resource and Tag Recommender System Based on Heat Diffusion Algorithm in Social Annotation Systems

Social annotation systems (SAS) allow users to annotate different online resources with keywords (tags). These systems help users in finding, organizing, and retrieving online resources to significantly provide collaborative semantic data to be potentially applied by recommender systems. Previous studies on SAS had been worked on tag recommendation. Recently, SAS‐based resource recommendation has received more attention by scholars. In the most of such systems, with respect to annotated tags, searched resources are recommended to user, and their recent behavior and click‐through is not taken into account. In the current study, to be able to design and implement a more precise recommender system, because of previous users' tagging data and users' current click‐through, it was attempted to work on the both resource (such as web pages, research papers, etc.) and tag recommendation problem. Moreover, by applying heat diffusion algorithm during the recommendation process, more diverse options would present to the user. After extracting data, such as users, tags, resources, and relations between them, the recommender system so called “Swallow” creates a graph‐based pattern from system log files. Eventually, following the active user path and observing heat conduction on the created pattern, user further goals are anticipated and recommended to him. Test results on SAS data set demonstrate that the proposed algorithm has improved the accuracy of former recommendation algorithms.     

Collaborative user modeling with user-generated tags for social recommender systems

With the popularity of social media services, the sheer amount of content is increasing exponentially on the Social Web that leads to attract considerable attention to recommender systems. Recommender systems provide users with recommendations of items suited to their needs. To provide proper recommendations to users, recommender systems require an accurate user model that can reflect a user’s characteristics, preferences and needs. In this study, by leveraging user-generated tags as preference indicators, we propose a new collaborative approach to user modeling that can be exploited to recommender systems. Our approach first discovers relevant and irrelevant topics for users, and then enriches an individual user model with collaboration from other similar users. In order to evaluate the performance of our model, we compare experimental results with a user model based on collaborative filtering approaches and a vector space model. The experimental results have shown the proposed model provides a better representation in user interests and achieves better recommendation results in terms of accuracy and ranking.     

Item recommendation using tag emotion in social cataloging services

Due to the overload of contents, the user suffers from difficulty in selecting items. The social cataloging services allow users to consume items and share their opinions, which influences in not only oneself but other users to choose new items. The recommendation system reduces the problem of the choice by recommending the items considering the behavior of the people and the characteristics of the items.In this study, we propose a tag-based recommendation method considering the emotions reflected in the user’s tags. Since the user’s estimation of the item is made after consuming the item, the feelings of the user obtained during consuming are directly reflected in ratings and tags. The rating has overall valence on the item, and the tag represents the detailed feelings. Therefore, we assume that the user’s rating for an item is the basic emotion of the tag attached to the item, and the emotion of tag is adjusted by the unique emotion value of the tag. We represent the relationships between users, items, and tags as a three-order tensor and apply tensor factorization. The experimental results show that the proposed method achieves better recommendation performance than baselines.     

基于RBLDA模型和交互关系的微博标签推荐算法

随着互联网技术的发展, 个性化标签推荐系统在海量信息或资源过滤中起着重要的角色. 在新浪微博平台中, 用户可以自主的给自己添加标签来表明自己的兴趣爱好. 同时, 用户也可以通过标签来搜索与自己兴趣爱好相似的用户. 针对新浪微博中大部分用户没有添加标签或添加标签数目较少的问题, 提出了一种基于RBLDA模型和交互关系的微博标签推荐算法, 它首先利用RBLDA模型来产生用户的初始标签列表, 然后再结合用户的交互关系而形成的交互图来预测用户标签的算法. 通过在新浪微博真实数据集上的实验发现, 该方案与传统的标签推荐算法相比, 取得了良好的实验效果.     

标签推荐方法研究综述

随着互联网信息的爆炸式增长,标签(由用户指定用来描述项目的关键词)在互联网信息检索领域中变得越来越重要.为在线内容赋予合适的标签,有利于更高效的内容组织和内容消费.而标签推荐通过辅助用户进行打标签的操作,极大地提升了标签的质量,标签推荐也因此受到了研究者们的广泛关注.总结出标签推荐任务的三大特性,即项目内容的多样性、标...     

基于标签信息特征相似性的协同过滤个性化推荐

标签推荐系统旨在利用标签数据为用户提供个性化推荐。已有的基于标签的推荐方法往往忽视了用户和资源本身的特征,而且在相似性度量时仅针对项目相似性或用户相似性进行计算,并未充分考虑二者之间的有效融合,推荐结果的准确性较低。为了解决上述问题,将标签信息融入到结合用户相似性和项目相似性的协同过滤中,提出融合标签特征与相似性的协同过滤个性化推荐方法。该方法在充分考虑用户、项目以及标签信息的基础上,利用二维矩阵来定义用户-标签以及标签-项目之间的行为。构建用户和项目的标签特征表示,通过基于标签特征的相似性度量方法计算用户相似性和项目相似性。基于用户标签行为和用户与项目的相似性线性组合来预测用户对项目的偏好值,并根据预测偏好值排序,生成最终的推荐列表。在Last.fm数据集上的实验结果表明,该方法能够提高推荐的准确度,满足用户的个性化需求。     

一种综合标签和时间因素的个性化推荐方法

针对现存的基于标签的社会化推荐系统在构建用户兴趣模型时存在的缺陷,提出一种综合标签及其时间信息的资源推荐(TTRR)模型。此模型考虑了用户的兴趣具有时间性的特点,即用户兴趣是随着时间而变化的、用户最近新打的标签更能反映用户近期的兴趣这一特性。为此,在借鉴协同过滤思想的基础上,通过利用标签使用频率信息和项目的标注时间来构建用户评分伪矩阵;在此基础上计算目标用户的最近邻集合;最后根据邻居用户给出推荐结果。通过在CiteULike数据集上进行实验,并与传统的基于标注的推荐方法进行比较,实验结果表明,TTRR模型能够更好地反映出用户的偏好,能够显著地提高推荐准确度。     

Folksonomy‐Based Recommender Systems: A State‐of‐the‐Art Review

Collaborative tagging systems, also known as folksonomies, have grown in popularity over the Web on account of their simplicity to organize several types of content (e.g., Web pages, pictures, and video) using open‐ended tags. The rapid adoption of these systems has led to an increasing amount of users providing information about themselves and, at the same time, a growing and rich corpus of social knowledge that can be exploited by recommendation technologies. In this context, tripartite relationships between users, resources, and tags contained in folksonomies set new challenges for knowledge discovery approaches to be applied for the purposes of assisting users through recommendation systems. This review aims at providing a comprehensive overview of the literature in the field of folksonomy‐based recommender systems. Current recommendation approaches stemming from fields such as user modeling, collaborative filtering, content, and link‐analysis are reviewed and discussed to provide a starting point for researchers in the field as well as explore future research lines.     

一种融合个性化与多样性的人物标签推荐方法

针对人物标签推荐中多样性及推荐标签质量问题,该文提出了一种融合个性化与多样性的人物标签推荐方法。该方法使用主题模型对用户关注对象建模,通过聚类分析把具有相似言论的对象划分到同一类簇;然后对每个类簇的标签进行冗余处理,并选取代表性标签;最后对不同类簇中的标签融合排序,以获取Top-K个标签推荐给用户。实验结果表明,与已有推荐方法相比,该方法在反映用户兴趣爱好的同时,能显著提高标签推荐质量和推荐结果的多样性。     

一种基于混合粒度的微博用户标签推荐模型

针对已有的标签推荐模型在实际微博场景运用中存在的多样性、相关性较差等不足,提出了一种基于混合粒度的标签推荐模型。将微博用户的可分析资源分解成由用户信息、标签和微博正文组成的混合粒度,在不同粒度上分别进行个人信息过滤及个性标签分析,从而计算用户标签的熵值与内联度和分类标注标签词汇,提取微博正文主题等,最终为用户推荐具有较强关联性的个性化标签。与一般LDA模型的对比实验证明,该模型可以有效解决新用户的冷启动、标签推荐的准确度等问题,同时保证了推荐的多样性。     

融合关系与内容分析的社会标签推荐

标签是Web 2.0时代信息分类与索引的重要方式.为解决标签系统所面临的不一致性、冗余性以及完备性等问题,标签推荐通过提供备选标签的方法来提高标签的质量.为了进一步提升标签推荐的质量,提出了一种基于标签系统中对象间关系与资源内容融合分析的标签推荐方法,给出了基于LDA(latent Dirichlet allocation)的融合表示对象间关系与资源内容的标签系统生成模型TSM/Forc,提出了一种基于概率的标签推荐方法,并给出了基于吉布斯(Gibbs)抽样的参数估计方法.实验结果表明,该方法可以提供比当前主流与最新方法更加准确的推荐结果.     

一种融合标签和知识图谱的推荐方法

随着信息的海量增长,推荐系统成为我们日常生活中一种重要的应用。传统的推荐系统根据用户和物品的交互行为进行推荐并利用用户对物品的评分来体现用户的喜好,但是数据的稀疏性会影响推荐结果的准确度,并且简单地评分数字也难以体现用户偏好的主观性以及用户选择的可解释性。因此,该文提出了一种融合标签和知识图谱的推荐方法,其中标签是一种文本信息,其包含的丰富内容和潜在的语义信息可以体现用户对物品的主观评价,对推荐起着关键作用。而知识图谱作为一种有效的推荐辅助技术,其包含的大量实体能为物品提供更多有效的特征信息。此外,该文还提出了一种融合注意力和自注意力的混合注意力模型,通过标签和实体为物品特征分配混合注意力权重,从而提高了推荐性能。实验结果表明,在MovieLens和Last.FM数据集上,该模型的推荐性能较其他推荐算法有所提升。     

Leveraging social semantic components in executable environments for learning

Learning can benefit from the modern Web structure through the convergence of top‐down encyclopedic institutional knowledge and bottom‐up user‐generated annotations. A promising approach to such convergence consists in leveraging the social functionalities in 3.0 executable environments through the recommendation of tags with the mediation of lexical and semantic resources. This paper addresses such issues through the design and evaluation of a tag recommendation system in a Web 3.0 Web portal, ‘150 Digit’. Designed for schools, 150 Digit encourages students and teachers to interact with a set of four exhibitions on the historical and social aspects of the Italian unification process in a virtual environment. The website displays the exhibits and their related documents promoting the users' active participation through tagging, voting and commenting on the exhibits. Tags become a way for students to create and explore new relations among the site contents, orthogonal to the institutional viewpoint. In this paper, we illustrate the recommendation strategy incorporated in 150 Digit, which relies on a semantic middleware to mediate between the input expressed by the users through tags and the top‐down institutional classification provided by the curators of the exhibitions. Following this, we describe the evaluation process conducted in a real experimental setting and discuss the evaluation results and their implications for learning environments.