{
  "_notes": [
    "Phase 4 — Dual CNN architecture comparison (image only).",
    "Goal: isolate the effect of bilateral processing by comparing architectures without clinical data.",
    "Best settings from phase 3 carried forward: iop_ratio_drop_raw, bcd_p05 (p07 did not stack).",
    "common_args are prepended to every run's args list.",
    "All runs use --bridge-mode image_only — no clinical data."
  ],

  "common_args": [
    "--eval-mode", "binary",
    "--bridge-mode", "image_only",
    "--epochs", "30",
    "--in-memory-cache",
    "--augment",
    "--tune-binary-threshold",
    "--backbone", "refugelike",
    "--iop-corr-method", "ratio",
    "--iop-drop-raw",
    "--output-root", "v3/results"
  ],

  "_common_args_implicit_defaults": {
    "--tower-loss-mode": "bcd",
    "--bcd-prob": "0.5",
    "--warmup-cd-epochs": "0",
    "--bilat-warmup-tower-epochs": "3",
    "--bilat-warmup-fused-epochs": "3"
  },

  "baseline": {
    "run_name": "phase4/single",
    "description": "Single-eye baseline with best phase 3 image settings. Direct comparison point for bilateral modes.",
    "extra_args": ["--hypertower-mode", "single"]
  },

  "groups": [
    {
      "name": "architecture",
      "description": "Core bilateral architecture comparison.",
      "runs": [
        {
          "run_name": "phase4/ensemble",
          "description": "Ensemble: two independent single-eye forward passes, patient-level average of OD+OS scores.",
          "extra_args": ["--hypertower-mode", "ensemble"]
        },
        {
          "run_name": "phase4/bilateral",
          "description": "BilateralHT: shared towers, concat OD+OS → learned joint projection MLP → classifier.",
          "extra_args": ["--hypertower-mode", "bilateral"]
        },
        {
          "run_name": "phase4/siamese",
          "description": "SiameseHT: shared backbone, mean+delta (asymmetry) representation → classifier.",
          "extra_args": ["--hypertower-mode", "siamese"]
        }
      ]
    },

    {
      "name": "loss_bilateral",
      "description": "Test loss function sensitivity in bilateral modes (using winner from architecture group).",
      "runs": [
        {
          "run_name": "phase4/bilateral_loss_all",
          "description": "BilateralHT with all-losses mode — joint training dynamics may differ from single-eye.",
          "extra_args": ["--hypertower-mode", "bilateral", "--tower-loss-mode", "all"]
        },
        {
          "run_name": "phase4/siamese_loss_all",
          "description": "SiameseHT with all-losses mode.",
          "extra_args": ["--hypertower-mode", "siamese", "--tower-loss-mode", "all"]
        }
      ]
    }
  ]
}