Encyclopedia of Social Network Analysis and Mining

2018 Edition
| Editors: Reda Alhajj, Jon Rokne

Social-Based Collaborative Filtering

  • Kostas Stefanidis
  • Eirini Ntoutsi
  • Haridimos Kondylakis
  • Yannis Velegrakis
Reference work entry
DOI: https://doi.org/10.1007/978-1-4939-7131-2_110171

Synonyms

Glossary

Collaborative filtering

Given a ratings matrix R, representing the preferences of users U for items I, recommend to each user a list of items in descending order of their relevance for the user. The relevance scores are estimated based on ratings of similar users

Ratings matrix

Assume a set of users U and a set of items I in the recommender system. A user uU might provide her preference for an item iI in form of a rating denoted by rating (u, i), which typically takes values in (Adomavicius et al. 2011; Blei et al. 2003). The preferences of users for individual items are represented by a ratings matrix R, where the Ru,i entry corresponds to rating (u, i)

Recommendation

A suggestion or proposal to a user for an item, e.g., book, movie, video, news article, that is potentially interesting for the user

Recommender system

A system or engine that produces recommendations by predicting the...

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Recommended Reading

  1. Shi Y, Larson M, Hanjalic A (2014) Collaborative filtering beyond the user-item matrix: a survey of the state of the art and future challenges. ACM Comput Surv 47(1):3:1–3:45CrossRefGoogle Scholar
  2. Stefanidis K, Ntoutsi E, Kondylakis H Information hunting: the many faces of recommendations for data exploration. ACM SIGMOD Blog. http://wp.sigmod.org/?p=1580

Copyright information

© Springer Science+Business Media LLC, part of Springer Nature 2018

Authors and Affiliations

  • Kostas Stefanidis
    • 1
  • Eirini Ntoutsi
    • 2
    • 5
  • Haridimos Kondylakis
    • 2
    • 3
  • Yannis Velegrakis
    • 4
  1. 1.School of Information SciencesUniversity of TampereTampereFinland
  2. 2.Department of Electrical Engineering and Computer ScienceLeibniz University HannoverHannoverGermany
  3. 3.Foundation for Research and Technology HellasInstitute of Computer Science (ICS)HellasGreece
  4. 4.Department of Information Engineering and Computer ScienceUniversity of TrentoTrentoItaly
  5. 5.Ludwig Maximilian Univ. MunichMunichGermany

Section editors and affiliations

  • Giovanni Semeraro
    • 1
  • Cataldo Musto
    • 2
  1. 1.Department of Computer ScienceUniversity of Bari "Aldo Moro"BariItaly
  2. 2.BariItaly