TrustDL: Use of trust-based dictionary learning to facilitate recommendation in social networks

Collaborative filtering (CF) is a widely applied method to perform recommendation tasks in a wide range of domains and applications. Dictionary learning (DL) models, which are highly important in CF-based recommender systems (RSs), are well represented by rating matrices. However, these methods alon...

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Published inExpert systems with applications Vol. 228; p. 120487
Main Authors Khaledian, Navid, Nazari, Amin, Khamforoosh, Keyhan, Abualigah, Laith, Javaheri, Danial
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 15.10.2023
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Abstract Collaborative filtering (CF) is a widely applied method to perform recommendation tasks in a wide range of domains and applications. Dictionary learning (DL) models, which are highly important in CF-based recommender systems (RSs), are well represented by rating matrices. However, these methods alone do not resolve the cold start and data sparsity issues in RSs. We observed a significant improvement in rating results by adding trust information on the social network. For that purpose, we proposed a new dictionary learning technique based on trust information, called TrustDL, where the social network data were employed in the process of recommendation based on structural details on the trusted network. TrustDL sought to integrate the sources of information, including trust statements and ratings, into the recommendation model to mitigate both problems of cold start and data sparsity. It conducted dictionary learning and trust embedding simultaneously to predict unknown rating values. In this paper, the dictionary learning technique was integrated into rating learning, along with the trust consistency regularization term designed to offer a more accurate understanding of the feature representation. Moreover, partially identical trust embedding was developed, where users with similar rating sets could cluster together, and those with similar rating sets could be represented collaboratively. The proposed strategy appears significantly beneficial based on experiments conducted on four frequently used datasets: Epinions, Ciao, FilmTrust, and Flixster.
AbstractList Collaborative filtering (CF) is a widely applied method to perform recommendation tasks in a wide range of domains and applications. Dictionary learning (DL) models, which are highly important in CF-based recommender systems (RSs), are well represented by rating matrices. However, these methods alone do not resolve the cold start and data sparsity issues in RSs. We observed a significant improvement in rating results by adding trust information on the social network. For that purpose, we proposed a new dictionary learning technique based on trust information, called TrustDL, where the social network data were employed in the process of recommendation based on structural details on the trusted network. TrustDL sought to integrate the sources of information, including trust statements and ratings, into the recommendation model to mitigate both problems of cold start and data sparsity. It conducted dictionary learning and trust embedding simultaneously to predict unknown rating values. In this paper, the dictionary learning technique was integrated into rating learning, along with the trust consistency regularization term designed to offer a more accurate understanding of the feature representation. Moreover, partially identical trust embedding was developed, where users with similar rating sets could cluster together, and those with similar rating sets could be represented collaboratively. The proposed strategy appears significantly beneficial based on experiments conducted on four frequently used datasets: Epinions, Ciao, FilmTrust, and Flixster.
ArticleNumber 120487
Author Abualigah, Laith
Khaledian, Navid
Javaheri, Danial
Nazari, Amin
Khamforoosh, Keyhan
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  organization: Department of Computer Engineering, Chosun University, Gwangju 61452, Republic of Korea
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Keywords Sparse representation
Trust relationship
Recommender systems
Dictionary learning
Machine learning
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Snippet Collaborative filtering (CF) is a widely applied method to perform recommendation tasks in a wide range of domains and applications. Dictionary learning (DL)...
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SourceType Enrichment Source
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Publisher
StartPage 120487
SubjectTerms Dictionary learning
Machine learning
Recommender systems
Sparse representation
Trust relationship
Title TrustDL: Use of trust-based dictionary learning to facilitate recommendation in social networks
URI https://dx.doi.org/10.1016/j.eswa.2023.120487
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