The prediction module using Slope-One algorithm can compute popular items.

In this implementation, popular items are not only the most frequent items. Each user’s ratings defines some kind of relative order of a subset of items. The prediction module compute some kind of global order for all items by merging all “user subset’s orders”. This is actually using Slope-One algorithm for a user which would rate all items with same score.

Popular items recommendation is useful for new user!

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