{
  "note": "fold_0: lr 2.5e-5 with 10% warm-up (kernel hindi-songs-phase-b-fold0-warmup, no collapse). fold_1..fold_4: lr 5e-5, no warm-up, collapse guard (kernels hindi-songs-phase-b-a / -b, 1-2 restarts each). Fold 0 of the -a kernel collapsed twice, barely trained and was replaced. These are the models behind lyrics_phaseb_cv in data/multimodal/embeddings.npz and results/classification/phaseb/. test_*_theme_cos: mean cosine among the fold's unseen test songs, same vs different theme. Full curves: phase_b_training_log.json.",
  "fold_0": {
    "lr": 2.5e-05,
    "warmup_ratio": 0.1,
    "restarts": 0,
    "n_train_songs": 7678,
    "n_triplets": 3133,
    "kernel": "hindi-songs-phase-b-fold0-warmup",
    "final_loss": 0.0478,
    "final_probe_cos": 0.111,
    "test_same_theme_cos": 0.425,
    "test_diff_theme_cos": 0.029
  },
  "fold_1": {
    "lr": 5e-05,
    "warmup_ratio": 0.0,
    "restarts": 1,
    "n_train_songs": 7664,
    "n_triplets": 3134,
    "kernel": "hindi-songs-phase-b-a",
    "final_loss": 0.0746,
    "final_probe_cos": 0.113,
    "test_same_theme_cos": 0.388,
    "test_diff_theme_cos": 0.062
  },
  "fold_2": {
    "lr": 5e-05,
    "warmup_ratio": 0.0,
    "restarts": 2,
    "n_train_songs": 7688,
    "n_triplets": 3144,
    "kernel": "hindi-songs-phase-b-a",
    "final_loss": 0.1271,
    "final_probe_cos": 0.243,
    "test_same_theme_cos": 0.487,
    "test_diff_theme_cos": 0.191
  },
  "fold_3": {
    "lr": 5e-05,
    "warmup_ratio": 0.0,
    "restarts": 1,
    "n_train_songs": 7683,
    "n_triplets": 3132,
    "kernel": "hindi-songs-phase-b-b",
    "final_loss": 0.0263,
    "final_probe_cos": 0.076,
    "test_same_theme_cos": 0.391,
    "test_diff_theme_cos": 0.023
  },
  "fold_4": {
    "lr": 5e-05,
    "warmup_ratio": 0.0,
    "restarts": 2,
    "n_train_songs": 7684,
    "n_triplets": 3155,
    "kernel": "hindi-songs-phase-b-b",
    "final_loss": 0.0687,
    "final_probe_cos": 0.092,
    "test_same_theme_cos": 0.375,
    "test_diff_theme_cos": 0.016
  }
}