Hi, Implicit factorization is important for us since it drives recommendation when modeling user click/no-click and also topic modeling to handle 0 counts in document x word matrices through NMF and Sparse Coding.
I am a bit confused on this code: val c1 = alpha * math.abs(rating) if (rating > 0) ls.add(srcFactor, (c1 + 1.0)/c1, c1) When the alpha = 1.0 (high confidence) and rating is > 0 (true for word counts), why this formula does not become same as explicit formula: ls.add(srcFactor, rating, 1.0) For modeling document, I believe implicit Y'Y needs to stay but we need explicit ls.add(srcFactor, rating, 1.0) I am understanding confidence code further. Please let me know if the idea of mapping implicit to handle 0 counts in document word matrix makes sense. Thanks. Deb
