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| license: cc-by-4.0 |
| tags: [medical-imaging, intracranial-hemorrhage, rsna, variance-study] |
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| # Sequence-head variance study — `ICH_ef04_A_baseline_b03-v2_seed42` |
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| Step 6's `A_baseline` beat EF03 on validation (0.9526 vs 0.9472) and lost on test |
| (0.9569 vs 0.9772). This study isolates why: the 12-epoch sequence-head val curve |
| swings ~0.06 on a flat loss, so "best val" selects the maximum of twelve noisy draws. |
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| Sweeps learning rate x selection rule x seed, training only the sequence heads from |
| frozen Step-6 embeddings (~3 min per run). The config is chosen on **val-side |
| stability** — seed spread and val-curve swing — never on test. |
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| `scores/seed*/` hold Step-2-schema dumps for the chosen config, one directory per |
| seed, so Step 4 can be pointed at each in turn and the across-seed spread of the |
| FINAL metrics measured directly. |
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