Evaluation of the recommendation systems
We have discussed all of the most relevant methods used in the commercial environment to date. The evaluation of a recommendation system can be executed offline (using only the data in the utility matrix) or online (using the utility matrix data and the new data provided in real time by each user using the website). The online evaluation procedures are discussed in Chapter 7, Movie Recommendation System Web Application, together with a proper online movie recommendation system website. In this section, we will evaluate the performances of the methods using two offline tests often used to evaluate recommendation systems: root mean square error on ratings and ranking accuracy. For all the evaluations in which ...
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