Recommender Systems

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120sintermediate (5/10)state theorem

Collaborative filtering via matrix factorization writes the rating matrix R \approx U V^{T} with user factors U and item factors V . What does optimizing \sum_{(u, i) \in Ω} (R_{u i} - U_{u}^{T} V_{i})^{2} + λ (∥ U ∥_{F}^{2} + ∥ V ∥_{F}^{2}) over observed entries Ω produce?