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Formula reference
Cosine similarity
cos(A,B) = (A·B) / (||A|| ||B||)
Jaccard similarity
J(A,B) = |A ∩ B| / |A ∪ B|
Precision@K
Relevant recommendations / K
Recall@K
Relevant recommendations / all relevant items
F1 score
2 × precision × recall / (precision + recall)
Weighted profile
Σ(weight × item vector) / Σ(weights)