{
 "question": "is the L60 collapse lost information or a readout that lost reach",
 "method": "shipped head recipe: two 1024-d towers, InfoNCE, fitted per layer",
 "control": "a fitted head at L47 must clearly beat head-free, or the instrument is invalid",
 "n_images": 5000,
 "n_train": 4000,
 "n_holdout": 1000,
 "backbone": "google/gemma-4-31B-it",
 "results": {
  "L4": {
   "head_free": {
    "r@1": 0.013000000268220901,
    "r@10": 0.0560000017285347,
    "median_rank": 269.0,
    "r@1_vs_chance": 13
   },
   "fitted_head": {
    "r@1": 0.08000000566244125,
    "r@10": 0.3620000183582306,
    "median_rank": 21.0,
    "r@1_vs_chance": 80
   }
  },
  "L12": {
   "head_free": {
    "r@1": 0.04700000211596489,
    "r@10": 0.21900001168251038,
    "median_rank": 116.0,
    "r@1_vs_chance": 47
   },
   "fitted_head": {
    "r@1": 0.17500001192092896,
    "r@10": 0.5640000104904175,
    "median_rank": 8.0,
    "r@1_vs_chance": 175
   }
  },
  "L20": {
   "head_free": {
    "r@1": 0.10000000149011612,
    "r@10": 0.3070000112056732,
    "median_rank": 76.0,
    "r@1_vs_chance": 100
   },
   "fitted_head": {
    "r@1": 0.2930000126361847,
    "r@10": 0.6810000538825989,
    "median_rank": 4.0,
    "r@1_vs_chance": 293
   }
  },
  "L28": {
   "head_free": {
    "r@1": 0.015000000596046448,
    "r@10": 0.055000003427267075,
    "median_rank": 329.0,
    "r@1_vs_chance": 15
   },
   "fitted_head": {
    "r@1": 0.1720000058412552,
    "r@10": 0.527999997138977,
    "median_rank": 9.0,
    "r@1_vs_chance": 172
   }
  },
  "L36": {
   "head_free": {
    "r@1": 0.06800000369548798,
    "r@10": 0.20500001311302185,
    "median_rank": 127.0,
    "r@1_vs_chance": 68
   },
   "fitted_head": {
    "r@1": 0.24000000953674316,
    "r@10": 0.6320000290870667,
    "median_rank": 5.0,
    "r@1_vs_chance": 240
   }
  },
  "L44": {
   "head_free": {
    "r@1": 0.13700000941753387,
    "r@10": 0.3920000195503235,
    "median_rank": 24.0,
    "r@1_vs_chance": 137
   },
   "fitted_head": {
    "r@1": 0.2540000081062317,
    "r@10": 0.6550000309944153,
    "median_rank": 5.0,
    "r@1_vs_chance": 254
   }
  },
  "L47": {
   "head_free": {
    "r@1": 0.16700001060962677,
    "r@10": 0.4190000295639038,
    "median_rank": 20.0,
    "r@1_vs_chance": 167
   },
   "fitted_head": {
    "r@1": 0.23000000417232513,
    "r@10": 0.6350000500679016,
    "median_rank": 5.0,
    "r@1_vs_chance": 230
   }
  },
  "L54": {
   "head_free": {
    "r@1": 0.1600000113248825,
    "r@10": 0.5570000410079956,
    "median_rank": 8.0,
    "r@1_vs_chance": 160
   },
   "fitted_head": {
    "r@1": 0.19300000369548798,
    "r@10": 0.5800000429153442,
    "median_rank": 7.0,
    "r@1_vs_chance": 193
   }
  },
  "L60": {
   "head_free": {
    "r@1": 0.003000000026077032,
    "r@10": 0.03700000047683716,
    "median_rank": 393.0,
    "r@1_vs_chance": 3
   },
   "fitted_head": {
    "r@1": 0.1080000028014183,
    "r@10": 0.41700002551078796,
    "median_rank": 16.0,
    "r@1_vs_chance": 108
   }
  }
 },
 "chance_r@1": 0.001,
 "chance_median_rank": 500.0
}