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Hierarchical Negative Binomial Factorization for Recommender Systems on Implicit Feedback
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Measured effects reported in the paper
| What was changed | Where | Measured | Effect |
|---|---|---|---|
| Use hierarchical, factorized dispersion estimation rather than HPF's Poisson model | FastHNBF · Last.fm1K | nDCG@5: 35.5±1.2 -> 52.3±0.9 | Helped |
| Use hierarchical, factorized dispersion estimation rather than HPF's Poisson model | FastHNBF · Last.fm2K | nDCG@5: 16.0±0.6 -> 23.3±0.2 | Helped |
| Use hierarchical, factorized dispersion estimation rather than HPF's Poisson model | FastHNBF · Last.fm360K | nDCG@5: 9.96±0.2 -> 11.1±0.2 | Helped |
| Use hierarchical, factorized dispersion estimation rather than HPF's Poisson model | FastHNBF · MovieLens100K | nDCG@5: 37.5±0.9 -> 38.2±0.6 | Helped |
| Use hierarchical, factorized dispersion estimation rather than HPF's Poisson model | FastHNBF · MovieLens1M | nDCG@5: 33.4±0.3 -> 33.6±0.3 | Helped |
| Use hierarchical, factorized dispersion estimation rather than HPF's Poisson model | FastHNBF · MovieLens20M | nDCG@5: 30.0±0.3 -> 30.0±0.3 | No clear effect |
| Use hierarchical, factorized dispersion estimation rather than NBF's single-layer dispersion model | FastHNBF · Jester2 | nDCG@5: 41.1±1.0 -> 41.9±0.7 | Helped |
| Use hierarchical, factorized dispersion estimation rather than WMF's Gaussian exposure model | FastHNBF · EachMovie | nDCG@5: 50.7±0.7 -> 47.8±0.6 | Hurt |
| Replace entry-wise dispersion for zero entries with factorized dispersion | FastHNBF · implicit feedback | updating time complexity: O(MN) -> O(|X +|) | Helped |
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