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- In plot (a) we see that NDCG decreases by 0.3 for topic T10 as mu increases, but for T13 varying mu has little effect.
- In plot (b) we see that decreasing the fbOrigWeight (and therefore increasing the effect of the expansion terms) has a positive effect for topics T11 and T13, but a negative effect for topic T7.
- In plot (c) we see that PubMed expansion has a negative effect for T3 as compared to RM3 expansion.
- Similarly, in plot (d) we see that Wikipedia expansion expansion in general has a negative effect compared to RM3 or PubMed RM3 expansion.
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| (a) Dirichlet (mu) | (b) RM3 (fbOrigWeight) | (c) PubMed RM3 (fbOrigWeight) | (d) Wikiepdia RM3 (fbOrigWeight) |
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