Table 1 Overall comparison between the bm25 and pmra models.
From: PubMed related articles: a probabilistic topic-based model for content similarity
Run | Model | Description | P5 | vs. bm25 b | bm25* |
|---|---|---|---|---|---|
bm25 b | bm25 (k1 = 1.2, b = 0.75) | bm25, default parameters | 0.381 | -0.5%° | |
bm25* | bm25 (k1 = 1.9, b = 1.00) | bm25, optimal parameters | 0.383 | +0.5%° | |
pmra* | pmra (λ = 0.022, μ = 0.013) | pmra, optimal parameters | 0.399 | +4.7% ** | +4.2% ** |