Add tile size to the propensity calculation #8478
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Description
This is an adjustment of the propensity job to take into account tile_format. We also no longer group by section position, though we may add it in the future.
In addition we are using the common tile sizes in to rescale the weights so that the total impressions and clicks do not change much.
This table is applied by multiplying the weight by the clicks, or dividing into impressions of the appropriate position and tile size for the sections view layout. We find a 30% reduction in variance when we compare per hour click-through rates by hour when this correction is applied. When dividing by impressions increased weighting is applied to items that the user has selected when scrolling though the list.
The table schema is changed, so I don't know I need update the version. No other jobs use this as of yet
Related Tickets & Documents
https://mozilla-hub.atlassian.net/browse/GENAI-2450
Reviewer, please follow this checklist