And what you feel would be better.
im a phd student in the second years, i have to implement user-based collaborative filtering using traditionnal approach in matlab for producting recommendation and Mesuring the performance of the algorithm with MAE, i have some problems :when i use the whole matrix of the data base movielens, the time of computing is very long,mode busy
and the MAE is superieur than 1, what can i do, please?

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