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Yahoo, Summer 2004 16 ML-rate
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user-user Grot Rescarch Collaborative Filtering Target 1 Customer 3 521 We gigi ched Sum Yahoo, Summer 2004 19
Yahoo, Summer 2004 19 User-User Collaborative Filtering ? Target Customer Weighted Sum 3
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Yahoo, Summer 2004 20 Challenge: Sparsity Many E-commerce applications have many more customers than products Many customers have no relationship Most products have some relationship