Personalized recommendation systems are a common feature of e-commerce, streaming services, and other fields. However, they are not common in the field of interior environment design. Existing international research tends to prioritize deep learning-based recommendation algorithms. These methods rely heavily on large-scale data and complex models to improve the accuracy of recommendations. However, they often face significant limitations. Therefore, this paper proposes a personalized recommendation model for interior environment design based on clustering collaborative filtering algorithm and user portrait. The model improves the traditional collaborative filtering recommendation algorithm. Based on the established UPICF recommendation algorithm, the constructed model is verified through performance analysis and practical application test. The experimental results show that when the number of neighbors is 20, the MAE of the model is 0.7035, which has better personalized recommendation performance. In addition, in the personalized recommendation application of interior environment design, the click-through rate of the model is increased by 0.115, and the purchase conversion rate of users is increased by about 0.270, which further proves the effectiveness of the model. The results show that this model can provide more accurate, diversified and personalized indoor environment design solutions to meet the individual needs of users.
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