基于神經(jīng)網(wǎng)絡集成和用戶偏好模型的協(xié)同過濾推薦算法研究
[Abstract]:With the development of Internet technology and the vigorous growth of electronic commerce, the network data information is growing at the exponential level, users have to spend a lot of time searching for the information and goods they want, and people have entered an era of "information overload". Recommendation system emerges as the times require, its main task is to actively push the resources it may need for users from a large number of resources, and alleviate the pressure of information retrieval. In the current application, the cooperative filtering algorithm has made the greatest achievement, but it is also inevitable to encounter many obstacles in the development. The problem of data sparse is an important problem that hinders its development. In order to solve the problem of data sparsity, from the point of view of user interest, this paper constructs a user preference model to predict the score of ungraded items from the point of view of user interest, and fills the data into the user scoring matrix. However, there are fuzziness and uncertainty in the description of user preference, which brings some difficulties to user preference modeling. It is necessary to introduce machine learning method to construct user preference model. Neural network integration algorithm has good generalization ability, and it is a hot research topic in the field of machine learning, which can be used to simulate the preferences of users. However, in the face of the complexity of user preferences, neural network integration algorithms will also have some shortcomings. In view of this situation, this paper first puts forward its own improved idea for the traditional neural network integration algorithm, and proposes a negative correlation neural network integration algorithm based on differential evolution, which improves the generalization ability of the neural network integration algorithm. Secondly, using the improved algorithm, combined with the existing user data, the user preference model is constructed. Finally, the constructed preference model is used to predict the score of ungraded items, fill the user scoring matrix, and improve the calculation of similarity in order to solve the problem of overfilling. The basic idea of negative correlation neural network integration algorithm based on differential evolution is: in order to increase the difference of integrated individuals, negative correlation learning method is introduced to train member networks in parallel, and in the generation of conclusions, the weight coefficients of member networks are optimized by using the good optimization ability of differential evolution algorithm. Through the experimental simulation and comparing it with other algorithms, the results show that the algorithm performs better both in terms of generalization performance and robustness. The basic idea of user preference model based on differential evolution neural network integration is: make full use of project feature attributes, construct project feature vector, construct user preference model through the mapping of project feature vector and user preference, and use the proposed differential evolution negative correlation neural network integration algorithm to simulate users' interests and hobbies. The experimental results show that the proposed differential evolution negative correlation neural network integration algorithm can simulate the preferences of users and predict the score of ungraded items. The basic idea of collaborative filtering recommendation algorithm based on user preference model is to use the constructed preference model to predict the score of ungraded items, fill in the user scoring matrix, and form a pseudo-user scoring matrix. When the pseudo-user rating matrix is used to calculate the similarity of users, only part of the items are selected to calculate the possible overfilling problem. Through the test of MovieLens dataset, this algorithm has better performance than the traditional collaborative filtering recommendation algorithm.
【學位授予單位】:華中師范大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:TP391.3
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