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An effective profile expansion technique based on movie genres and user demographic information to improve movie recommendation systems

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Abstract

Movie recommendation systems are efficient tools to help users find their relevant movies by investigating the previous interests of users. These systems are established on considering the ratings of users provided for movies in the past and using them to predict their interests in the future. However, users mainly provide insufficient ratings leading to make a problem called data sparsity. This problem makes reducing the effectiveness of movie recommendation systems. On the other hand, other available data such as genres of movies and demographic information of users play a vital role in assisting recommenders in order to better produce recommendations. This paper proposes a movie recommendation method utilizing the movies’ genres and users’ demographic information. In particular, we propose an effective model to evaluate the user’s rating profile and determine the minimum number of ratings required to produce an accurate prediction. Then, appropriate virtual ratings are incorporated into the profiles with insufficient ratings to expand them. These virtual ratings are calculated using similarity values between users obtained by genres of movies and demographic information of users. Furthermore, an effective measure is introduced to determine how much an item is reliable. This measure guarantees the virtual ratings’ reliability. Finally, unknown ratings for target user are predicted based on the expanded rating profiles. Experiments performed on two well-known movie recommendation datasets demonstrate that the proposed approach is more efficient than other compared recommenders.

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Data availability

All the datasets used in this paper are publicly available. The links to access these datasets are provided in this paper.

Notes

  1. https://grouplens.org/datasets/movielens/

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Authors and Affiliations

  1. Department of Computer Engineering, Islamic Azad University, Central Tehran Branch, Tehran, Iran

    Samad Mohamadi, Vahe Aghazarian & Alireza Hedayati

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  1. Samad Mohamadi
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  2. Vahe Aghazarian
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  3. Alireza Hedayati
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Correspondence to Vahe Aghazarian.

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Mohamadi, S., Aghazarian, V. & Hedayati, A. An effective profile expansion technique based on movie genres and user demographic information to improve movie recommendation systems. Multimed Tools Appl 82, 38275–38296 (2023). https://doi.org/10.1007/s11042-023-15141-2

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