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Cold Start and Who the Model Fails

The error is not spread evenly: it is 1.28 times worse for the users with fewest ratings, which is exactly the group a recommender most needs to convince.

IntermediateModule 228 min · 110 XP
A single error bar splitting into three as users are sorted by how much they have rated, the sparsest group standing visibly higher, and a new user’s empty row falling back to the item offsets alone.

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