{
 "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": 30000,
 "n_train": 28000,
 "n_holdout": 2000,
 "backbone": "google/gemma-4-31B-it",
 "results": {
  "L20": {
   "head_free": {
    "r@1": 0.06650000065565109,
    "r@10": 0.23800000548362732,
    "median_rank": 145.0
   },
   "fitted_head": {
    "r@1": 0.3295000195503235,
    "r@10": 0.7630000114440918,
    "median_rank": 3.0
   }
  },
  "L47": {
   "head_free": {
    "r@1": 0.12250000238418579,
    "r@10": 0.3615000247955322,
    "median_rank": 31.0
   },
   "fitted_head": {
    "r@1": 0.30000001192092896,
    "r@10": 0.6925000548362732,
    "median_rank": 4.0
   }
  }
 }
}