Recommender Systems. Customization. Customization is one of the more attractive features of electronic commerce. Creating a different product for every user, suited to his/her tastes. Once thought to be a novelty, now essential
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2/6 * 1/6 * 1/6 * 2/6 = 0.003
e * e * 1/4 * e ~ 0.00025
(epsilon helps us deal with sparse data)