Selection of Clusters based on Internal Indices in Multi-Clustering Collaborative Filtering Recommender System

Urszula Kużelewska

Abstract


The successful application of a multi-clustering based neighborhood approach to recommender systems has led to increased recommendation accuracy and the elimination of divergence related to differences in clustering methods traditionally used. The Multi-Clustering Collaborative Filtering algorithm was developed to achieve this, as described in the author’s previous papers. However, utilizing multiple clusters poses challenges regarding memory consumption and scalability.
Not all partitionings are equally advantageous, making selecting clusters for the recommender system’s input crucial without compromising recommendation accuracy. This article presents a solution for selecting clustering schemes
based on internal indices evaluation. This method can be employed for preparing input data in collaborative filtering recommender systems. The study’s results confirm the positive impact of scheme selection on the overall recommendation
performance, as it typically improves after the selection process.
Furthermore, a smaller number of clustering schemes used as
input for the recommender system enhances scalability and
reduces memory consumption. The findings are compared with
baseline recommenders’ outcomes to validate the effectiveness of
the proposed approach.

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