Stop MoE corpus from keying the retweeter - #188
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AuthorColdStart gated Phoenix MoE scores on wrapper author_id. Retweets of a treatment origin by an unbucketed retweeter were zeroed; retweets of a control origin by a treatment retweeter leaked. Key the original author, matching Phoenix tweet_info.
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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
AuthorColdStart::author_corpusgated Phoenix MoE scores on wrapperauthor_id. Phoenix already keys the original author (as_tweet_info/get_original_author_id). A treatment-origin retweet by an unbucketed retweeter was zeroed. A control-origin retweet by a treatment retweeter leaked into treatment For You.This is not #172 (RankingScorer author-diversity pool). This is not #31 / author-size IPS. This is not #125 (gizmoduck origin size/NSFW). Diversity stays the post-Phoenix repeat lever. Corpus membership is the MoE keep/zero gate.
Five-line proof
ForYouPhoenixRetrievalMoe; CoreData writesretweeted_user_idfrom TESsource_user_id.author_corpus->apply_moe_ranking_policy->RankingScorer/VMRanker->TopKScoreSelector.c.author_id(retweeter).get_original_author_id()was unused.PostCandidate::as_tweet_infoalready sends the original author to Phoenix. Cold-start boost already excludes RTs (retweeted_tweet_id.is_none()).Fix
Key
AuthorIsTreatment/AuthorIsControlonget_original_author_id(). Originals and quotes unchanged.Tests
treatment_keeps_moe_retweet_of_treatment_origin(fails on unmodified main)treatment_zeros_moe_retweet_of_control_origin(fails on unmodified main)Standalone rustc model of old vs new corpus: 3/3 passed (2 fail on unmodified main).
cargo: cannot run. Public dump has no home-mixer Cargo.toml.
Rejection table (this wave)