Fuzzy TOPSIS Approach in the Recommender Systems’ Collaborative Filtering models

Author: Tamari Gogebashvili
Keywords: TOPSIS, collaborative filtering, recommendation system
Annotation:

This workdescribes an approach for improving the accuracy of memory-based collaborative filtering, based on the technique for order of preference by similarity to ideal solution (TOPSIS) method. The software is designed in a Python (anaconda) environment and uses appropriate algorithms and libraries. Recommender systems are used to filter the huge amount of data available online based on user-defined preferences. Collaborative filtering (CF) is a commonly used recommendation approach that generates recommendations based on correlations among user preferences. Although several enhancements have increased the accuracy of memory-based CF through the development of improved similarity measures for finding successful neighbors, there has been less investigation into prediction score methods, in which rating/preference scores are assigned to items that have not yet been selected by a user. A TOPSIS solution for evaluating multiple alternatives based on more than one criterion is proposed as an alternative to prediction score methods for evaluating and ranking items based on the results from similar users. The recommendation accuracy of the proposed TOPSIS technique is evaluated by applying it to various common CF baseline methods, which are then used to analyze the Book-Crossing dataset. The results show that CF based on the TOPSIS method is more accurate than baseline CF methods across a number of common evaluation metrics.