X Algorithm Scoring

The X algorithm calculates a weighted engagement score for each post by combining predicted probabilities of 18 user actions. This score determines feed ranking.

Weighted Score Formula

Score = Σ(weight × P(action)) for all 18 actions + offset

From home-mixer/scorers/weighted_scorer.rs:

fn compute_weighted_score(candidate: &PostCandidate) -> f64 {
    let s: &PhoenixScores = &candidate.phoenix_scores;
    let vqv_weight = Self::vqv_weight_eligibility(candidate);