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Add log(i+1) discount for nDCG etc. #417

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mdekstrand opened this issue Jun 5, 2024 · 0 comments
Open

Add log(i+1) discount for nDCG etc. #417

mdekstrand opened this issue Jun 5, 2024 · 0 comments
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evaluation

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@mdekstrand
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Right now, LensKit nDCG uses and defaults to $\mathrm{log}_2(\mathrm{max}(i, 2))$ for discounting, as done in the original nDCG paper. A widely-used alternative is $\mathrm{log}_2(i+1)$, which we should also support.

We should discuss which should be the default.
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