Data Imputation Using a Trust Network for Recommendation via Matrix Factorization

摘要

A rating missing value replacement apparatus is disclosed which replaces a rating for an item that a particular user has not evaluated with a rating of a neighboring user connected through a trust network. Determining a user that can be reached via a forward direction of a particular user and an edge on a trust network and a user who can be reached through a reverse direction of an edge as a neighbor user, Obtaining a rating of a neighboring user for an item having no rating, replacing a rating of a specific user for an item that does not have a particular user's rating as a value calculated from a rating of a neighboring user for an item having no rating of a particular user ), It is possible to replace the rating.