l60_head_refit.json

{
 "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": {
  "L28": {
   "head_free": {
    "r@1": 0.015000000596046448,
    "r@10": 0.055000003427267075,
    "median_rank": 329.0
   },
   "fitted_head": {
    "r@1": 0.17400000989437103,
    "r@10": 0.5330000519752502,
    "median_rank": 9.0
   }
  },
  "L47": {
   "head_free": {
    "r@1": 0.16700001060962677,
    "r@10": 0.4190000295639038,
    "median_rank": 20.0
   },
   "fitted_head": {
    "r@1": 0.22700001299381256,
    "r@10": 0.6340000033378601,
    "median_rank": 5.0
   }
  },
  "L54": {
   "head_free": {
    "r@1": 0.1600000113248825,
    "r@10": 0.5570000410079956,
    "median_rank": 8.0
   },
   "fitted_head": {
    "r@1": 0.1980000138282776,
    "r@10": 0.578000009059906,
    "median_rank": 7.0
   }
  },
  "L60": {
   "head_free": {
    "r@1": 0.003000000026077032,
    "r@10": 0.03700000047683716,
    "median_rank": 393.0
   },
   "fitted_head": {
    "r@1": 0.1080000028014183,
    "r@10": 0.40700000524520874,
    "median_rank": 16.0
   }
  }
 }
}