{
  "checkpoint": "gemma-27b_layer58_ml50-54-58_maghead_mlp_h2048x2_t0.05_a1.0.pt",
  "arch": "maghead_mlp, MULTI-LAYER input (concat residuals of layers 50,54,58 -> 16128-d) + linear mag head",
  "base_model": "gemma-3-27b",
  "data": "fineweb-gemma27b-residuals (24 shards)",
  "layers": [
    50,
    54,
    58
  ],
  "d_res": 16128,
  "data_shards": 24,
  "val_rank1": 0.676,
  "val_dir_rank1": 0.693,
  "val_cos": 0.443,
  "val_mag_mse": 0.685,
  "date": "2026-06-07",
  "note": "OVERALL RETRIEVAL SOTA across all parascope probes. Multi-layer input (3 mid+deep layers) + 24sh data stack: single-L58-16sh 0.658 -> ml3-12sh 0.661 -> ml3-24sh 0.676. dir_rank1 0.693. Decode still magnitude-capped (mag_mse ~0.69); multi-layer lifts direction/retrieval, not the magnitude wall."
}