Tweak solr weights/boosts - switch from additive boosting to multiplactive boosting - #12357
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Pull request overview
Adjusts Work Search’s Solr eDismax tuning to use multiplicative boosting (via boost) instead of additive boosting (via bf) to reduce over-weighting of popularity signals relative to textual relevance.
Changes:
- Replaces
bf-based additive boosts with an eDismaxboostfunction expression. - Expands/adjusts
qfand phrase-boost parameters (pf,pf2) to change match weighting and proximity scoring.
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Patching this out now for a bit to monitor performance. |
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Here's an example @cdrini showed where the search was "The secret of secrets" which didn't appear within the first 15 results on (before) and is 3rd on (after) 
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Closes #11777
Technical
bfparameter for our boosting, but this applied additive boosting, meaning the boosting could outweight the relevance quite drastically. Switching toboostgives us multiplicative boosting, which is recommended. See Additive Boosts vs Multiplicative Boostsqf, where previously we only had a few, and (2) using morepffields. If there is too much of a performance cost, we can switch back to usingtext; there is still a big improvement from the boosting changes alone.Testing
Improves upon all classes in our evaluation spreadsheet. C in the following tables (Note A is the same as C, but using
textinstead of the explicit listing of fields.)You can also compare results before/after here: https://codepen.io/cdrini/full/wvJqzaK
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