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  • Vijayakumar Ramdoss thinks this is interesting:

In collaborative filtering, we consider only user-item-preferences and build the recommender systems. Though this approach is accurate, it makes more sense if we consider user properties and item properties while building recommendation engines. Unlike in collaborative filtering, we use item properties and user preferences to the item properties while building content-based recommendation engines.

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Cover of Building Recommendation Engines

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This paragraph need to be elaborated well