{
  "experiment": "PGAC Phase 2 \u2014 Probe-Gated Adaptive Compute on Qwen3.6-27B",
  "corpus": {
    "gsm8k": 30,
    "simpleqa": 20,
    "wikipedia": 40,
    "total_residuals_per_layer": 39375
  },
  "primary_finding": {
    "headline": "3.57x compound inference speedup at 8pp quality loss",
    "config": "linear probe + top-(4k) prediction breadth + early-exit (1.67x avg)",
    "best_pair": "L11\u2192L31 (gap 20, early-mid)"
  },
  "tradeoff_curve_L11_L31": [
    {
      "m": 128,
      "recall": 0.4005,
      "layer_speedup": 2.96,
      "compound_w_exit": 4.94
    },
    {
      "m": 256,
      "recall": 0.5067,
      "layer_speedup": 2.93,
      "compound_w_exit": 4.89
    },
    {
      "m": 512,
      "recall": 0.6097,
      "layer_speedup": 2.86,
      "compound_w_exit": 4.78
    },
    {
      "m": 1024,
      "recall": 0.7002,
      "layer_speedup": 2.73,
      "compound_w_exit": 4.56
    },
    {
      "m": 2048,
      "recall": 0.7754,
      "layer_speedup": 2.5,
      "compound_w_exit": 4.18
    },
    {
      "m": 4096,
      "recall": 0.8375,
      "layer_speedup": 2.14,
      "compound_w_exit": 3.57,
      "sweet_spot": true
    },
    {
      "m": 8192,
      "recall": 0.8972,
      "layer_speedup": 1.67,
      "compound_w_exit": 2.79
    }
  ],
  "sweet_spots_by_quality_budget": {
    "8pp_loss_within_sae_floor": {
      "m": 4096,
      "compound_speedup": 3.57
    },
    "5pp_loss_tighter": {
      "m": 8192,
      "compound_speedup": 2.79
    },
    "12pp_loss_relaxed": {
      "m": 2048,
      "compound_speedup": 4.18
    }
  },
  "layer_pair_3_experiment": {
    "L11_L31": {
      "gap": 20,
      "recall_at_k_128": 0.4005,
      "recall_at_2k": 0.5067
    },
    "L31_L55": {
      "gap": 24,
      "recall_at_k_128": 0.2796,
      "recall_at_2k": 0.3671
    },
    "L11_L55": {
      "gap": 44,
      "recall_at_k_128": 0.2057,
      "recall_at_2k": 0.2813
    }
  },
  "verdict": "\ud83d\udfe2 STRONG with proper m selection \u2014 paper-grade positive contribution",
  "paper_status": "ship",
  "comparison_prior_art": {
    "MxD_May_2025": "1.5-2x layer speedup",
    "RouteSAE_2025": "training only, not inference",
    "MoD_2024": "1.5x token-level skip",
    "PGAC_this_work": "3.57x compound at iso-SAE-floor"
  }
}