Improving co-SVD for cold-start recommendations using sparsity reduction

Low Jia Ming*, Chern Hong Lim, Ian K. T. Tan

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Recommender systems are highly dependent on the users' or items' historical data. The completeness of the data determines the performance of the models, especially for models based on the collaborative filtering (CF) technique. Under cold-start situations, where there are limited relevant historical data on the users' or items' information, producing accurate recommendations are challenging. We propose the use of the implicit Alternating Least Square (iALS) method to predict users' preferences and impute it into the matrix co-factorization algorithm, co-SVD. The proposed approach aims to alleviate the cold-start problem that is most evident in large datasets that have high sparsity. In addition, we included the results for two cold-start situations, cold-start user and cold-start item (long-tail), using our hybrid co-SVD with artificial ratings imputation. The F1 score of the top-5 recommendations generated by the proposed approach improved from 25.08% to 30.09% under the cold-start user situation. With the long-tail item situation, the proposed approach improved from 20.8% to 23.19%. The proposed approach is method-agnostic, and other CF-based models can benefit from this imputation method.

Original languageEnglish
Title of host publication2022 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference (APSIPA ASC)
PublisherIEEE
Pages990-996
Number of pages7
ISBN (Electronic)9786165904773
DOIs
Publication statusPublished - 21 Dec 2022
Event2022 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference - Chiang Mai, Thailand
Duration: 7 Nov 202210 Nov 2022

Conference

Conference2022 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference
Abbreviated titleAPSIPA ASC 2022
Country/TerritoryThailand
CityChiang Mai
Period7/11/2210/11/22

Keywords

  • cold-start problem
  • implicit feedback
  • matrix co-factorization
  • Recommender system

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Information Systems
  • Signal Processing

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