Stop RankingScorer author diversity from keying the retweeter - #172
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Stop RankingScorer author diversity from keying the retweeter#172Pitchfork-and-Torch wants to merge 1 commit into
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This was referenced Sep 8, 2026
RankingScorer author-pool decay used the wrapper author_id. Phoenix already hashes get_original_author_id, so one original could flood For You through distinct retweeters while a single retweeter of distinct authors was decayed. Count diversity on the original author.
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Parking this intern-stack PR per operator GitHub cleanup (2026-09-08). Hunt notes remain local. Not a reject of the class. |
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Bug
RankingScorer::author_pool_countsdecayed on wrapperauthor_id. Phoenix ranking features already key the original author (as_tweet_info/get_original_author_id). Distinct retweeters of one original did not share a diversity bucket. One retweeter of distinct originals did.This is not #31 (author-size IPS). This is not #125 (gizmoduck origin size/NSFW). This is not #128/#154/#135 (in_network stamps).
in_networkstays the poster. Diversity is the post-Phoenix author-repeat lever.Five-line proof
RankingScorer::author_pool_counts(EnableAuthorDiversity)PhoenixCandidatePipelinescorers[PhoenixScorer, RankingScorer, VMRanker]thenTopKScoreSelectorauthor_idwhile Phoenix hashedget_original_author_id()PostCandidate::as_tweet_info/build_tweet_infosalready send the original author to PhoenixChange
get_original_author_id()(retweeted user, else poster)retweeted_user_id)Tests
Standalone rustc model of
author_pool_counts+get_original_author_id: 3/3 passed.cargo testcannot run. Public dump has no home-mixer crate manifest.Fork PR: none