The explicit feedback recommendation algorithm only considers each item individually, predicts the preference of a single user for a single item, and gives an accurate score. The common collaborative filtering algorithm is the most basic explicit feedback algorithm. It can be divided into memory based algorithm and model-based algorithm. Matrix factorization algorithm is a classical model-based collaborative filtering algorithm. Due to the strong scalability of matrix factorization algorithm, many extended algorithms of matrix factorization algorithm have been proposed<br>
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