Tweepcred: Clamp + Entropy Guard to prevent coordinated lists & brigades#15995
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infinitumsimias wants to merge 2 commits intotwitter:mainfrom
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Tweepcred: Clamp + Entropy Guard to prevent coordinated lists & brigades#15995infinitumsimias wants to merge 2 commits intotwitter:mainfrom
infinitumsimias wants to merge 2 commits intotwitter:mainfrom
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…ades. ### Summary This patch hardens Tweepcred against coordinated blocklist brigades. ### Changes - Added `maxDailyNegDelta`, `normalCap`, and `attackCap` constants. - Added entropy/diversity guard: if <50% of issuers are unique, treat as a coordinated brigade. - Dynamic clamping: normal cap = -100, brigade cap = -20. - Added telemetry stubs: counters for brigade detection and clamp activations. ### Impact - Prevents a small group of accounts from collapsing a user’s Tweepcred in one batch run. - Protects small/new creators from coordinated brigading while still applying organic penalties. - Maintains organic feedback fidelity (diverse, independent blocks still count). - Provides clear telemetry for monitoring and future tuning. ### Notes - Backward-compatible: legacy one-line clamp retained. - All new constants are scoped private, safe defaults. - No changes to visibilitylib or ranking layers in this patch; this only touches Tweepcred batch reputation adjustment.
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infinitumsimias
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Adjusted reputation adjustment logic - Fix penalty direction: use (adjusted - baseMass) instead of (mass - adjusted) so brigades are penalized. - Replace log(log(numFollowings)) with log(log1p(numFollowings)) to avoid invalid math for small values. - Add input sanitization: guard against NaN/Infinity and negative follower/following counts; clamp mass to non-negative before scaling.
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