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CoDFi-DL: a hybrid recommender system combining enhanced collaborative and demographic filtering based on deep learning

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Abstract

The cold start problem has always been a major challenge for recommender systems. It arises when the system lacks rating records for new users or items. Addressing the challenge of providing personalized recommendations in the cold start scenario is crucial. This research proposes a new hybrid recommender system named CoDFi-DL which combines demographic and enhanced collaborative filtering. The demographic filtering is performed through a deep neural network (DNN) and used to solve the new user cold start problem. The enhanced collaborative filtering component of our model focuses on delivering personalized recommendations through a neighborhood-based method. The major contribution in this research is the DNN-based demographic filtering which overcomes the new user cold start problem and enhances the collaborative filtering process. Our system significantly improves the relevancy of the recommendation task and thus provides personalized recommended items to cold users. To evaluate the effectiveness of our approach, we conducted experiments on real multi-label datasets, 1M and 100K MovieLens. CoDFi-DL recommender system showed higher performance in comparison with baseline methods, achieving lower RMSE rates of 0.5710 on the 1M MovieLens dataset and 0.6127 on the 100K MovieLens dataset.

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Datasets used can be accessed on www.kaggle.com.

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Author notes

  1. Zahra Kodia and Nadia Ben Azzouna have contributed equally to this work.

Authors and Affiliations

  1. University of Tunis, ISG Tunis, SMART-LAB, Cité Bouchoucha, 2000, Bardo, Tunis, Tunisia

    Jihene Latrech, Zahra Kodia & Nadia Ben Azzouna

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  1. Jihene Latrech
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  2. Zahra Kodia
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  3. Nadia Ben Azzouna
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Latrech, J., Kodia, Z. & Ben Azzouna, N. CoDFi-DL: a hybrid recommender system combining enhanced collaborative and demographic filtering based on deep learning. J Supercomput 80, 1160–1182 (2024). https://doi.org/10.1007/s11227-023-05519-2

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