Add analysis scripts and experiment configurations for bridge attention and sensitivity studies

- Introduced `bridge_attention_ceiling_check.py` for variance decomposition analysis on bridge attention configurations.
- Added `bridge_attention_readout.py` to perform per-tower gate and contribution readouts, including AUC sanity checks.
- Created multiple JSON configuration files for backbone replication experiments, including anonymous CV variants and basic backbones.
- Implemented sensitivity experiments to evaluate the impact of axial length inclusion and EfficientNetV2-M performance at higher resolutions.
- Added a memory probe script to assess GPU memory usage during training with EfficientNetV2-M.

v4/classes/accessory/transforms.py

@@ -76,39 +76,75 @@ class ImageTransformConfig:
         return transforms.Compose(ops)
 
 
-def backbone_transform_config(backbone_name: str, augment: bool = True) -> ImageTransformConfig:
-    """Build an ImageTransformConfig using the backbone's default normalisation stats."""
+def backbone_transform_config(
+    backbone_name: str,
+    augment:       bool       = True,
+    crop_size:     int | None = None,
+    resize_size:   int | None = None,
+) -> ImageTransformConfig:
+    """Build an ImageTransformConfig using the backbone's default normalisation stats.
+
+    crop_size / resize_size override the backbone's default input resolution. When
+    crop_size is overridden but resize_size is not, resize_size is scaled
+    proportionally (8/7 ratio, matching the standard 224 → 256 pattern).
+    """
     key = (backbone_name or "").lower()
     if _is_timm_backbone(key):
         # ConvNeXt-V2 and other timm models we currently expose are all
         # pretrained with standard ImageNet stats at 224×224.
-        return ImageTransformConfig(crop_size=224, mean=IMAGENET_MEAN,
-                                    std=IMAGENET_STD, augment=augment)
-    if key not in BACKBONES:
-        raise ValueError(f"Unknown backbone '{backbone_name}'.")
-    spec = BACKBONES[key]
-    mean = getattr(spec.weights_default, "meta", {}).get("mean", IMAGENET_MEAN)
-    std  = getattr(spec.weights_default, "meta", {}).get("std",  IMAGENET_STD)
-    crop = 299 if key == "inception_v3" else 224
-    return ImageTransformConfig(crop_size=crop, mean=mean, std=std, augment=augment)
+        mean, std = IMAGENET_MEAN, IMAGENET_STD
+        default_crop = 224
+    else:
+        if key not in BACKBONES:
+            raise ValueError(f"Unknown backbone '{backbone_name}'.")
+        spec = BACKBONES[key]
+        mean = getattr(spec.weights_default, "meta", {}).get("mean", IMAGENET_MEAN)
+        std  = getattr(spec.weights_default, "meta", {}).get("std",  IMAGENET_STD)
+        default_crop = 299 if key == "inception_v3" else 224
+
+    crop   = crop_size   if crop_size   is not None else default_crop
+    resize = resize_size if resize_size is not None else round(crop * 8 / 7)
+    return ImageTransformConfig(crop_size=crop, resize_size=resize,
+                                mean=mean, std=std, augment=augment)
 
 
-def build_backbone_transform(backbone_name: str, augment: bool = True) -> transforms.Compose:
-    return backbone_transform_config(backbone_name, augment=augment).build()
+def build_backbone_transform(
+    backbone_name: str,
+    augment:       bool       = True,
+    crop_size:     int | None = None,
+    resize_size:   int | None = None,
+) -> transforms.Compose:
+    return backbone_transform_config(
+        backbone_name, augment=augment,
+        crop_size=crop_size, resize_size=resize_size,
+    ).build()
 
 
-def build_eval_transform(backbone_name: str) -> transforms.Compose:
+def build_eval_transform(
+    backbone_name: str,
+    crop_size:     int | None = None,
+    resize_size:   int | None = None,
+) -> transforms.Compose:
     """Deterministic eval transform — no augmentation, backbone-matched normalisation."""
-    return build_backbone_transform(backbone_name, augment=False)
+    return build_backbone_transform(
+        backbone_name, augment=False,
+        crop_size=crop_size, resize_size=resize_size,
+    )
 
 
 def build_split_transforms(
-    backbone_name: str, augment: bool = True
+    backbone_name: str,
+    augment:       bool       = True,
+    crop_size:     int | None = None,
+    resize_size:   int | None = None,
 ) -> tuple[transforms.Compose, transforms.Compose]:
     """Return (precache, postcache) transform pair for tensor-cached image towers.
 
     precache  : PIL → CHW float32 in [0, 1]   (deterministic, run once at fill)
     postcache : tensor → augmented + normalized tensor   (run per batch)
     """
-    cfg = backbone_transform_config(backbone_name, augment=augment)
+    cfg = backbone_transform_config(
+        backbone_name, augment=augment,
+        crop_size=crop_size, resize_size=resize_size,
+    )
     return cfg.build_precache(), cfg.build_postcache()

v4/classes/logging/prediction_store.py

@@ -6,19 +6,19 @@ FeatureStore     — records embeddings (opt-in); same structure but per-head
 
 HDF5 layout — PredictionStore
 ------------------------------
-/{phase}/logits          float32  (n_folds, n_epochs, n_samples, n_heads, n_classes)
-/{phase}/head_names      str      (n_heads,)
-/{phase}/y_true          int64    (n_samples,)
-/{phase}/entity_id_{k}  int64|str (n_samples,)  — one dataset per id component
-/{phase}/split           str      (n_folds, n_samples)
-/{phase}/loss            float32  (n_folds, n_epochs)
+/{phase}/logits          float32          (n_folds, n_epochs, n_samples, n_heads, n_classes)
+/{phase}/head_names      str              (n_heads,)
+/{phase}/y_true          int64 | float64  (n_samples,)  — float64 for regression targets, int64 otherwise
+/{phase}/entity_id_{k}  int64|str         (n_samples,)  — one dataset per id component
+/{phase}/split           str              (n_folds, n_samples)
+/{phase}/loss            float32          (n_folds, n_epochs)
 
 HDF5 layout — FeatureStore
 ---------------------------
-/{phase}/{head_name}     float32  (n_folds, n_epochs, n_samples, embedding_dim)
-/{phase}/y_true          int64    (n_samples,)
-/{phase}/entity_id_{k}  int64|str (n_samples,)
-/{phase}/split           str      (n_folds, n_samples)
+/{phase}/{head_name}     float32          (n_folds, n_epochs, n_samples, embedding_dim)
+/{phase}/y_true          int64 | float64  (n_samples,)  — float64 for regression targets, int64 otherwise
+/{phase}/entity_id_{k}  int64|str         (n_samples,)
+/{phase}/split           str              (n_folds, n_samples)
 """
 from __future__ import annotations
 
@@ -35,6 +35,18 @@ except ImportError as e:
 _STR_DT = h5py.string_dtype()
 
 
+def _coerce_y_true(y_true) -> np.ndarray:
+    """Coerce y_true to int64 for integer-typed input, float64 otherwise.
+
+    Forcing int64 unconditionally would silently round regression targets
+    (e.g. VF_MD), so we honour float input by storing as float64.
+    """
+    arr = np.asarray(y_true)
+    if np.issubdtype(arr.dtype, np.floating):
+        return arr.astype(np.float64)
+    return arr.astype(np.int64)
+
+
 # ---------------------------------------------------------------------------
 # Internal phase buffer
 # ---------------------------------------------------------------------------
@@ -52,7 +64,7 @@ class _PhaseBuffer:
         n_s = len(entity_ids)
         n_h = len(head_names)
         self.entity_ids = list(entity_ids)
-        self.y_true     = np.asarray(y_true, dtype=np.int64)
+        self.y_true     = _coerce_y_true(y_true)
         self.head_names = list(head_names)
         self.n_epochs   = n_epochs
         self.logits     = np.full((n_folds, n_epochs, n_s, n_h, n_classes), np.nan, dtype=np.float32)
@@ -74,7 +86,7 @@ class _FeaturePhaseBuffer:
         n_folds:    int,
     ):
         self.entity_ids = list(entity_ids)
-        self.y_true     = np.asarray(y_true, dtype=np.int64)
+        self.y_true     = _coerce_y_true(y_true)
         self.split      = np.full((n_folds, len(entity_ids)), "", dtype=object)
         self._sid       = {str(eid): i for i, eid in enumerate(entity_ids)}
         # head_name → (buffer array, n_epochs)
@@ -148,7 +160,7 @@ class PredictionStore:
         """Register a training phase before recording begins."""
         self._phases[phase] = _PhaseBuffer(
             entity_ids=list(entity_ids),
-            y_true=np.asarray(y_true, dtype=np.int64),
+            y_true=_coerce_y_true(y_true),
             head_names=list(head_names),
             n_epochs=n_epochs,
             n_folds=self.n_folds,
@@ -306,7 +318,7 @@ class FeatureStore:
     ) -> None:
         self._phases[phase] = _FeaturePhaseBuffer(
             entity_ids=list(entity_ids),
-            y_true=np.asarray(y_true, dtype=np.int64),
+            y_true=_coerce_y_true(y_true),
             n_folds=self.n_folds,
         )
 

v4/classes/profiles/fundus_images.py

@@ -650,6 +650,177 @@ def build_geometry_loader(source: str, **kwargs):
     raise NotImplementedError(f"build_geometry_loader: source={source!r} not implemented")
 
 
+class _GTContourBboxLoader:
+    """Disc bounding-box loader from PAPILA expert disc contours.
+
+    Computes a square bbox centred on the disc, expanded by ``margin`` ×
+    max(disc_w, disc_h). Returned bboxes are in original-image pixel coords
+    and may extend past image bounds (clip at crop time).
+    """
+
+    def __init__(
+        self,
+        contour_dir: str | Path,
+        *,
+        margin:      float = 2.5,
+        expert:      int   = 1,
+    ) -> None:
+        self._contour_dir = Path(contour_dir)
+        self._margin      = float(margin)
+        self._expert      = int(expert)
+        self._cache: dict[tuple, tuple[int, int, int, int] | None] = {}
+
+    def reset_cache(self) -> None:
+        self._cache.clear()
+
+    def precompute(self, samples: Iterable[Tuple[int, str, Path]]) -> None:
+        for pid, eye, _ in list(samples):
+            key = (int(pid), str(eye))
+            if key in self._cache:
+                continue
+            self._cache[key] = self._compute_bbox(*key)
+
+    def bbox_for(self, pid, eye) -> tuple[int, int, int, int] | None:
+        key = (int(pid), str(eye))
+        if key not in self._cache:
+            self._cache[key] = self._compute_bbox(*key)
+        return self._cache[key]
+
+    def _compute_bbox(self, pid: int, eye: str) -> tuple[int, int, int, int] | None:
+        path = self._contour_dir / f"RET{pid:03d}{eye}_disc_exp{self._expert}.txt"
+        if not path.exists():
+            return None
+        try:
+            arr = np.loadtxt(str(path), dtype=np.float32)
+        except Exception:
+            return None
+        if arr.ndim == 1:
+            arr = arr.reshape(-1, 2)
+        if arr.shape[0] < 3:
+            return None
+        return _expand_bbox_from_points(arr[:, 0], arr[:, 1], self._margin)
+
+
+class _UNetBboxLoader:
+    """Disc bounding-box loader from U-Net predicted masks.
+
+    Reuses _PapilaUNetMaskPipeline for per-fold fine-tune + inference.
+    """
+
+    def __init__(
+        self,
+        weights_path: str | Path,
+        *,
+        contour_dir:         str | Path,
+        margin:              float = 2.5,
+        unet_size:           int   = 512,
+        normalize:           str   = "per_image",
+        threshold:           float = 0.5,
+        finetune_epochs:     int   = 0,
+        finetune_lr:         float = 1e-5,
+        finetune_batch_size: int   = 4,
+        device:              str | None = None,
+    ) -> None:
+        self._margin    = float(margin)
+        self._unet_size = int(unet_size)
+        self._pipeline  = _PapilaUNetMaskPipeline(
+            weights_path,
+            contour_dir=contour_dir,
+            unet_size=unet_size,
+            normalize=normalize,
+            threshold=threshold,
+            finetune_epochs=finetune_epochs,
+            finetune_lr=finetune_lr,
+            finetune_batch_size=finetune_batch_size,
+            device=device,
+        )
+        self._cache: dict[tuple, tuple[int, int, int, int] | None] = {}
+
+    def reset_cache(self) -> None:
+        self._cache.clear()
+
+    def reset_weights(self) -> None:
+        self._pipeline.reset_weights()
+
+    def finetune(self, train_samples: list) -> None:
+        self._pipeline.finetune(train_samples)
+
+    def precompute(self, samples: Iterable[Tuple[int, str, Path]]) -> None:
+        samples = list(samples)
+        if not samples:
+            return
+        # Need original-image dims to rescale mask coords back; capture per sample.
+        orig_sizes: dict[tuple, tuple[int, int]] = {}
+        for pid, eye, image_path in samples:
+            try:
+                with Image.open(image_path) as im:
+                    orig_sizes[(int(pid), str(eye))] = im.size  # (w, h)
+            except Exception:
+                continue
+        masks = self._pipeline.predict(samples)
+        for key, (disc, _cup) in masks.items():
+            ow, oh = orig_sizes.get(key, (self._unet_size, self._unet_size))
+            self._cache[key] = _bbox_from_mask(disc, ow, oh, self._margin)
+
+    def bbox_for(self, pid, eye) -> tuple[int, int, int, int] | None:
+        return self._cache.get((int(pid), str(eye)))
+
+
+def _expand_bbox_from_points(
+    xs: np.ndarray, ys: np.ndarray, margin: float
+) -> tuple[int, int, int, int]:
+    """Square bbox centred on disc centroid, half-side = margin × max(w,h) / 2."""
+    x0, x1 = float(xs.min()), float(xs.max())
+    y0, y1 = float(ys.min()), float(ys.max())
+    cx, cy = (x0 + x1) / 2.0, (y0 + y1) / 2.0
+    half   = max(x1 - x0, y1 - y0) * float(margin) / 2.0
+    return (int(round(cx - half)), int(round(cy - half)),
+            int(round(cx + half)), int(round(cy + half)))
+
+
+def _bbox_from_mask(
+    mask: np.ndarray, orig_w: int, orig_h: int, margin: float,
+) -> tuple[int, int, int, int] | None:
+    """Compute original-image bbox from a binary mask at mask resolution."""
+    ys, xs = np.where(mask > 0)
+    if len(xs) == 0:
+        return None
+    sx = float(orig_w) / float(mask.shape[1])
+    sy = float(orig_h) / float(mask.shape[0])
+    return _expand_bbox_from_points(xs * sx, ys * sy, margin)
+
+
+def build_disc_bbox_loader(source: str, **kwargs):
+    """Return a disc-bbox loader for the given source.
+
+    Parameters
+    ----------
+    source : "gt" | "unet"
+
+    GT kwargs:
+        contour_dir (required), margin=2.5, expert=1
+    UNet kwargs:
+        weights_path (required), contour_dir (required),
+        margin=2.5, unet_size=512, normalize="per_image", threshold=0.5,
+        finetune_epochs=0, finetune_lr=1e-5, finetune_batch_size=4, device=None
+    """
+    if source == "gt":
+        if "contour_dir" not in kwargs:
+            raise ValueError("build_disc_bbox_loader source='gt' requires contour_dir")
+        gt_keys = {"contour_dir", "margin", "expert"}
+        return _GTContourBboxLoader(**{k: v for k, v in kwargs.items() if k in gt_keys})
+    if source == "unet":
+        if "weights_path" not in kwargs:
+            raise ValueError("build_disc_bbox_loader source='unet' requires weights_path")
+        if "contour_dir" not in kwargs:
+            raise ValueError(
+                "build_disc_bbox_loader source='unet' requires contour_dir "
+                "(needed for per-fold fine-tuning, even if finetune_epochs=0)"
+            )
+        return _UNetBboxLoader(**kwargs)
+    raise NotImplementedError(f"build_disc_bbox_loader: source={source!r} not implemented")
+
+
 def build_seg_map_loader(source: str, **kwargs):
     """Return the appropriate seg-map loader for the given source string.
 

v4/classes/profiles/v4papila.py

@@ -480,6 +480,12 @@ class ImageDataView:
         from v4.classes.profiles.fundus_images import build_seg_map_loader as _build
         return _build(source, **self._resolve_paths(kwargs))
 
+    def build_disc_bbox_loader(self, source: str, **kwargs):
+        """Return a disc bounding-box loader for crop-to-disc preprocessing."""
+        from v4.classes.profiles.fundus_images import build_disc_bbox_loader as _build
+        kwargs.setdefault("contour_dir", self._DEFAULT_CONTOUR_DIR)
+        return _build(source, **self._resolve_paths(kwargs))
+
     # ── Optional explainability hooks ────────────────────────────────────────
     #
     # These methods are consumed by v4.classes.accessory.explainability via

v4/classes/stages/fusion.py

@@ -1,6 +1,7 @@
 """stages/fusion — fusion stage runner: trains a bridge + associated head stages."""
 from __future__ import annotations
 
+import contextlib
 import importlib
 from random import choice, random as _random
 
@@ -8,6 +9,20 @@ import numpy as np
 import torch
 import torch.nn.functional as F
 
+
+def _amp_ctx(cfg: dict, device):
+    """Autocast context for forward+loss when training.amp is enabled.
+
+    bf16 is the default dtype because its dynamic range matches fp32 and no
+    GradScaler is required. Falls back to a no-op context when amp is disabled
+    or the device is not CUDA/ROCm.
+    """
+    train_cfg = cfg.get("training", {})
+    if not train_cfg.get("amp", False) or getattr(device, "type", None) != "cuda":
+        return contextlib.nullcontext()
+    dtype = getattr(torch, train_cfg.get("amp_dtype", "bfloat16"))
+    return torch.autocast(device_type="cuda", dtype=dtype)
+
 from v4.classes.dataset import LoaderShell, to_label_tensor
 from v4.classes.metrics import score_arrays, compute_extended_metrics, tune_binary_threshold
 from v4.classes.stages.helpers import (
@@ -223,82 +238,78 @@ def run(
             if y_t.numel() == 0:
                 continue
 
-            if is_bilateral:
-                side_embs  = {
-                    side: encode_embedding(src, batch, side, towers, stage_models, cfg_stages, device)
-                    for side, src in inputs.items()
-                }
-                local_embs = {name: bridge(side_embs)}
-            else:
-                local_embs = {n: towers[n](batch[n].to(device)) for n in inputs
-                              if n in batch and torch.is_tensor(batch[n])}
-                if len(local_embs) != len(inputs):
-                    continue
-                local_embs[name] = bridge(list(local_embs[n] for n in inputs))
+            loss   = None
+            logits = None
 
-            head_logits = {
-                hs["name"]: head_models[hs["name"]](local_embs[hs["input"]])
-                for hs in head_stage_cfgs
-                if hs["input"] in local_embs
-            }
-
-            if is_bilateral or phase == "fused_warmup":
-                logits      = head_logits.get(primary_hs_cfg["name"])
-                chosen_head = head_models.get(primary_hs_cfg["name"])
-            elif phase == "tower_warmup" and bcd_head_cfgs:
-                losses = [
-                    head_compute_loss(head_models[hs["name"]],
-                                      head_logits[hs["name"]], batch, y_t,
-                                      class_weights=cw)
-                    for hs in bcd_head_cfgs if hs["name"] in head_logits
-                ]
-                if not losses:
-                    continue
-                loss = sum(losses) / len(losses)
-                if hasattr(bridge, "modify_loss"):
-                    loss = bridge.modify_loss(loss)
-                opt.zero_grad(); loss.backward(); opt.step()
-                total_loss += loss.item() * len(y_t)
-                total_n    += len(y_t)
-                continue
-            elif tower_loss_mode == "all_losses" and bcd_head_cfgs:
-                # All-losses (v3 phase 3 control): sum primary + every aux head
-                # loss every step. Effective LR is implicitly N× single-head BCD
-                # — matches v3 semantics so the comparison is apples-to-apples.
-                all_head_names = ([primary_hs_cfg["name"]]
-                                  + [hs["name"] for hs in bcd_head_cfgs])
-                losses = [
-                    head_compute_loss(head_models[n], head_logits[n], batch, y_t,
-                                      class_weights=cw)
-                    for n in all_head_names if n in head_logits
-                ]
-                if not losses:
-                    continue
-                loss = sum(losses)
-                if hasattr(bridge, "modify_loss"):
-                    loss = bridge.modify_loss(loss)
-                opt.zero_grad(); loss.backward(); opt.step()
-                total_loss += loss.item() * len(y_t)
-                total_n    += len(y_t)
-                continue
-            else:
-                if bcd_head_cfgs and _random() < bcd_prob:
-                    chosen_hs = choice(bcd_head_cfgs)
+            with _amp_ctx(cfg, device):
+                if is_bilateral:
+                    side_embs  = {
+                        side: encode_embedding(src, batch, side, towers, stage_models, cfg_stages, device)
+                        for side, src in inputs.items()
+                    }
+                    local_embs = {name: bridge(side_embs)}
                 else:
-                    chosen_hs = primary_hs_cfg
-                logits      = head_logits.get(chosen_hs["name"])
-                chosen_head = head_models.get(chosen_hs["name"])
+                    local_embs = {n: towers[n](batch[n].to(device)) for n in inputs
+                                  if n in batch and torch.is_tensor(batch[n])}
+                    if len(local_embs) != len(inputs):
+                        continue
+                    local_embs[name] = bridge(list(local_embs[n] for n in inputs))
 
-            if logits is None:
+                head_logits = {
+                    hs["name"]: head_models[hs["name"]](local_embs[hs["input"]])
+                    for hs in head_stage_cfgs
+                    if hs["input"] in local_embs
+                }
+
+                if is_bilateral or phase == "fused_warmup":
+                    logits      = head_logits.get(primary_hs_cfg["name"])
+                    chosen_head = head_models.get(primary_hs_cfg["name"])
+                    if logits is not None:
+                        loss = head_compute_loss(chosen_head, logits, batch, y_t, class_weights=cw)
+                elif phase == "tower_warmup" and bcd_head_cfgs:
+                    losses = [
+                        head_compute_loss(head_models[hs["name"]],
+                                          head_logits[hs["name"]], batch, y_t,
+                                          class_weights=cw)
+                        for hs in bcd_head_cfgs if hs["name"] in head_logits
+                    ]
+                    if losses:
+                        loss = sum(losses) / len(losses)
+                elif tower_loss_mode == "all_losses" and bcd_head_cfgs:
+                    # All-losses (v3 phase 3 control): sum primary + every aux head
+                    # loss every step. Effective LR is implicitly N× single-head BCD
+                    # — matches v3 semantics so the comparison is apples-to-apples.
+                    all_head_names = ([primary_hs_cfg["name"]]
+                                      + [hs["name"] for hs in bcd_head_cfgs])
+                    losses = [
+                        head_compute_loss(head_models[n], head_logits[n], batch, y_t,
+                                          class_weights=cw)
+                        for n in all_head_names if n in head_logits
+                    ]
+                    if losses:
+                        loss = sum(losses)
+                else:
+                    if bcd_head_cfgs and _random() < bcd_prob:
+                        chosen_hs = choice(bcd_head_cfgs)
+                    else:
+                        chosen_hs = primary_hs_cfg
+                    logits      = head_logits.get(chosen_hs["name"])
+                    chosen_head = head_models.get(chosen_hs["name"])
+                    if logits is not None:
+                        loss = head_compute_loss(chosen_head, logits, batch, y_t, class_weights=cw)
+
+                if loss is not None and hasattr(bridge, "modify_loss"):
+                    loss = bridge.modify_loss(loss)
+
+            if loss is None:
                 continue
-            loss = head_compute_loss(chosen_head, logits, batch, y_t, class_weights=cw)
-            if hasattr(bridge, "modify_loss"):
-                loss = bridge.modify_loss(loss)
+
             opt.zero_grad(); loss.backward(); opt.step()
-            if logits.dim() >= 2:
+
+            if logits is not None and logits.dim() >= 2:
                 total_correct += int((logits.argmax(1) == y_t).sum())
-            total_loss    += loss.item() * len(y_t)
-            total_n       += len(y_t)
+            total_loss += loss.item() * len(y_t)
+            total_n    += len(y_t)
 
         tr_loss = total_loss / total_n if total_n else nan
         tr_acc  = total_correct / total_n if total_n else nan

v4/classes/towers/image_tower.py

@@ -71,6 +71,13 @@ class ImageEncoder(TowerBase):
                         Normalize on tensors only (no PIL, no Resize, no decode).
                         Memory: ~3 × crop_size² × 4B per cached image.
                         Cache is rebuilt at the start of every fold via early_pass.
+    crop_source       : if set, crop each input image to a square disc-region
+                        bbox before the standard transform pipeline. Values:
+                        "gt" (use GT contour file) | "unet" (use U-Net mask)
+                        | None (disabled, full-image pipeline).
+    crop_kwargs       : dict forwarded to image_data.build_disc_bbox_loader().
+                        Common keys: margin (default 2.5), expert (GT only),
+                        weights_path / finetune_epochs (U-Net only).
     geometry_source   : source key passed to image_data.build_geometry_loader()
                         (e.g. "gt", "unet").  None = geometry disabled.
     **geom_kwargs     : forwarded verbatim to build_geometry_loader() — e.g.
@@ -89,6 +96,10 @@ class ImageEncoder(TowerBase):
         se_pre_norm:       bool       = True,
         augment:           bool       = True,
         cache_transformed: bool       = False,
+        crop_size:         int | None = None,
+        resize_size:       int | None = None,
+        crop_source:       str | None = None,
+        crop_kwargs:       dict | None = None,
         geometry_source:   str | None = None,
         **geom_kwargs: Any,
     ):
@@ -98,17 +109,37 @@ class ImageEncoder(TowerBase):
         self.backbone, self._base_dim, self._blocks = build_backbone(backbone, freeze_ratio)
 
         self._cache_transformed = cache_transformed
+        tf_kw = dict(crop_size=crop_size, resize_size=resize_size)
         if cache_transformed:
-            self._precache_tf, self._post_train_tf = build_split_transforms(backbone, augment=augment)
-            _,                 self._post_eval_tf  = build_split_transforms(backbone, augment=False)
+            self._precache_tf, self._post_train_tf = build_split_transforms(
+                backbone, augment=augment, **tf_kw)
+            _,                 self._post_eval_tf  = build_split_transforms(
+                backbone, augment=False, **tf_kw)
             self._tensor_cache: dict[tuple, torch.Tensor] = {}
         else:
-            self.transform      = build_backbone_transform(backbone, augment=augment)
-            self.eval_transform = build_eval_transform(backbone)
+            self.transform      = build_backbone_transform(backbone, augment=augment, **tf_kw)
+            self.eval_transform = build_eval_transform(backbone, **tf_kw)
 
         self.tower_ln = nn.LayerNorm(self._base_dim) if se_pre_norm else nn.Identity()
         self.tower_se = SEBlock(self._base_dim, reduction=se_reduction, residual=True) if use_se else None
 
+        self._bbox_loader = None
+        if crop_source is not None:
+            if not hasattr(image_data, "build_disc_bbox_loader"):
+                raise TypeError(
+                    f"ImageEncoder crop_source={crop_source!r} requires "
+                    f"image_data to implement build_disc_bbox_loader(), "
+                    f"but {type(image_data).__name__} does not."
+                )
+            self._bbox_loader = image_data.build_disc_bbox_loader(
+                crop_source, **(crop_kwargs or {}),
+            )
+            print(
+                f"[ImageEncoder] crop_source={crop_source!r}  "
+                f"kwargs={crop_kwargs or {}}",
+                flush=True,
+            )
+
         self._geom_loader = None
         if geometry_source is not None:
             if not hasattr(image_data, "build_geometry_loader"):
@@ -134,16 +165,32 @@ class ImageEncoder(TowerBase):
     def _side_map(self) -> dict[str, str]:
         return self.image_data.side_map
 
+    def _load_image(self, *ids):
+        """Load image, optionally cropped to the disc-region bbox."""
+        pil = self.image_data.load_image(*ids)
+        if self._bbox_loader is None:
+            return pil
+        bbox = self._bbox_loader.bbox_for(*ids[:2])
+        if bbox is None:
+            return pil
+        w, h = pil.size
+        x0, y0, x1, y1 = bbox
+        x0, y0 = max(0, x0), max(0, y0)
+        x1, y1 = min(w, x1), min(h, y1)
+        if x1 <= x0 or y1 <= y0:
+            return pil
+        return pil.crop((x0, y0, x1, y1))
+
     def _get(self, *ids) -> torch.Tensor:
         if self._cache_transformed:
             key = tuple(ids)
             cached = self._tensor_cache.get(key)
             if cached is None:
-                cached = self._precache_tf(self.image_data.load_image(*ids))
+                cached = self._precache_tf(self._load_image(*ids))
                 self._tensor_cache[key] = cached
             tail = self._post_train_tf if self.training else self._post_eval_tf
             return tail(cached)
-        img = self.image_data.load_image(*ids)
+        img = self._load_image(*ids)
         t   = self.transform if self.training else self.eval_transform
         return t(img)
 
@@ -154,6 +201,24 @@ class ImageEncoder(TowerBase):
         data  = context.require("data")
         split = context.require("split")
 
+        # Disc-region bbox precomputation (must run before any image load/cache).
+        if self._bbox_loader is not None:
+            train_samples = data.collect_samples(split.train)
+            all_samples   = train_samples + data.collect_samples(split.val)
+            if split.test is not None:
+                all_samples += data.collect_samples(split.test)
+            if hasattr(self._bbox_loader, "reset_cache"):
+                self._bbox_loader.reset_cache()
+            if hasattr(self._bbox_loader, "reset_weights"):
+                self._bbox_loader.reset_weights()
+            if hasattr(self._bbox_loader, "finetune"):
+                self._bbox_loader.finetune(train_samples)
+            self._bbox_loader.precompute(all_samples)
+            print(
+                f"[ImageEncoder] precomputed disc bboxes for {len(all_samples)} samples",
+                flush=True,
+            )
+
         if self._cache_transformed:
             self._tensor_cache.clear()
             n = self._warm_tensor_cache(data, split)
@@ -200,7 +265,7 @@ class ImageEncoder(TowerBase):
                 key = (pid, eye)
                 if key in self._tensor_cache or key in seen:
                     continue
-                self._tensor_cache[key] = self._precache_tf(self.image_data.load_image(pid, eye))
+                self._tensor_cache[key] = self._precache_tf(self._load_image(pid, eye))
                 seen.add(key)
         return len(self._tensor_cache)
 

v4/classes/v4_hypertower.py

@@ -359,21 +359,28 @@ def main():
 
         if save_predictions and eval_stage_preds:
             # Collect all unique entity_ids across val+test sets of all folds.
+            # Preserve the natural dtype of y so regression targets keep their
+            # fractional values (casting to int silently rounds VF_MD).
             seen, all_ids, id_to_y = set(), [], {}
+            y_is_float = False
             for fp in eval_stage_preds:
                 for eid, y in zip(fp["val_ids"], fp["val_y"]):
                     k = str(eid)
                     if k not in seen:
                         seen.add(k); all_ids.append(eid)
-                    id_to_y[k] = int(y)
+                    y_is_float = y_is_float or np.issubdtype(np.asarray(y).dtype, np.floating)
+                    id_to_y[k] = float(y) if y_is_float else int(y)
                 if fp.get("test_ids"):
                     for eid, y in zip(fp["test_ids"], fp["test_y"]):
                         k = str(eid)
                         if k not in seen:
                             seen.add(k); all_ids.append(eid)
-                        id_to_y[k] = int(y)
+                        y_is_float = y_is_float or np.issubdtype(np.asarray(y).dtype, np.floating)
+                        id_to_y[k] = float(y) if y_is_float else int(y)
 
-            y_true = np.array([id_to_y.get(str(e), -1) for e in all_ids], dtype=np.int64)
+            sentinel = float("nan") if y_is_float else -1
+            dtype    = np.float64 if y_is_float else np.int64
+            y_true = np.array([id_to_y.get(str(e), sentinel) for e in all_ids], dtype=dtype)
             store  = PredictionStore(n_folds=len(eval_stage_preds), n_classes=num_classes)
             store.register_phase(
                 phase=eval_stage,
@@ -402,19 +409,24 @@ def main():
             for phase, phase_preds in all_phase_preds.items():
                 emb_dim = phase_preds[0]["val_z"].shape[-1]
                 seen, all_ids, id_to_y = set(), [], {}
+                y_is_float = False
                 for fp in phase_preds:
                     for eid, y in zip(fp["val_ids"], fp["val_y"]):
                         k = str(eid)
                         if k not in seen:
                             seen.add(k); all_ids.append(eid)
-                        id_to_y[k] = int(y)
+                        y_is_float = y_is_float or np.issubdtype(np.asarray(y).dtype, np.floating)
+                        id_to_y[k] = float(y) if y_is_float else int(y)
                     if fp.get("test_ids"):
                         for eid, y in zip(fp["test_ids"], fp["test_y"]):
                             k = str(eid)
                             if k not in seen:
                                 seen.add(k); all_ids.append(eid)
-                            id_to_y[k] = int(y)
-                y_true = np.array([id_to_y.get(str(e), -1) for e in all_ids], dtype=np.int64)
+                            y_is_float = y_is_float or np.issubdtype(np.asarray(y).dtype, np.floating)
+                            id_to_y[k] = float(y) if y_is_float else int(y)
+                sentinel = float("nan") if y_is_float else -1
+                dtype    = np.float64 if y_is_float else np.int64
+                y_true = np.array([id_to_y.get(str(e), sentinel) for e in all_ids], dtype=dtype)
                 fstore.register_phase(phase=phase, entity_ids=all_ids, y_true=y_true)
                 fstore.register_head(phase=phase, head=f"{phase}_embedding",
                                      n_epochs=1, embedding_dim=emb_dim)

v4/distributed/client.py

@@ -168,20 +168,28 @@ def _gpu_info() -> str:
 # rsync helpers
 # ──────────────────────────────────────────────────────────────
 
-def _rsync(src: str, dst: str, delete: bool = False):
+def _rsync(src: str, dst: str, delete: bool = False,
+           excludes: list[str] | None = None):
     cmd = ["rsync", "-az", "--info=progress2"]
     if delete:
         cmd.append("--delete")
+    for pat in (excludes or []):
+        cmd.append(f"--exclude={pat}")
     cmd += [src, dst]
     subprocess.run(cmd, check=True)
 
 
 def _sync_code(server_ssh: str, server_path: str, local_path: str):
-    """Pull v4/ source from server → local (overwrites local changes)."""
+    """Pull v4/ source from server → local (overwrites local changes).
+
+    results/ is excluded so the client never overwrites or deletes its own
+    per-job output directory, and so it never pulls down the full corpus of
+    historical results from the server.
+    """
     src = f"{server_ssh}:{server_path}/v4/"
     dst = f"{local_path}/v4/"
     Path(dst).mkdir(parents=True, exist_ok=True)
-    _rsync(src, dst, delete=True)
+    _rsync(src, dst, delete=True, excludes=["results/"])
 
 
 def _upload_results(server_ssh: str, server_path: str, local_path: str,

v4/distributed/server.py

@@ -413,8 +413,33 @@ def submit_job(job: JobSubmit):
         )
         if cur.rowcount == 0:
             existing = conn.execute(
-                "SELECT job_id FROM jobs WHERE args=?", (args_json,)
+                "SELECT job_id, state FROM jobs WHERE args=?", (args_json,)
             ).fetchone()
+            # If the existing duplicate is a terminal failure, drop it and
+            # take the new submission — saves an explicit /jobs/clear round-
+            # trip when re-deploying after a fix.
+            if existing["state"] == "failed":
+                conn.execute(
+                    "DELETE FROM jobs WHERE job_id=?", (existing["job_id"],)
+                )
+                conn.execute(
+                    "INSERT INTO jobs "
+                    "(job_id, run_name, module, args, output_dir, priority, created_at) "
+                    "VALUES (?,?,?,?,?,?,?)",
+                    (job_id, job.run_name, job.module, args_json,
+                     job.output_dir, job.priority, _now()),
+                )
+                print(
+                    f"[server] requeued failed {existing['job_id']} → {job_id} "
+                    f"({job.run_name})",
+                    flush=True,
+                )
+                return {
+                    "job_id":          job_id,
+                    "duplicate":       False,
+                    "requeued":        True,
+                    "previous_job_id": existing["job_id"],
+                }
             job_id = existing["job_id"]
             print(f"[server] duplicate ignored ({job.run_name}) → {job_id}", flush=True)
             return {"job_id": job_id, "duplicate": True}

v4/figures/F2_papila_replication_and_single_mode.py

@@ -1,50 +1,56 @@
-"""F2 — Backbone selection panel.
+"""F2 - Backbone selection panel.
 
 Box plot in the style of v3/figures/phase2_analysis.png (black-bordered boxes,
 red median lines, baseline median reference). Three left-to-right sections:
 
-  Block 1 (blue) — Basic backbones (img-only, single-eye, ImageNet pretraining):
+  Block 1 (blue) -- Basic backbones (img-only, single-eye, ImageNet pretraining):
       VGG16, MobileNetV2, DenseNet121, InceptionV3, ResNet50
-      Sourced from v3 phase 1 / phase 2 fold AUCs. Will be refined with v4
-      10x5 runs later; means should not move much.
+      Sourced from v4 experiments/backbone_replication/basic_* (10x5 = 50 fold-rep
+      AUCs each, img-only single-eye, patient-grouped CV).
 
-  Block 2 (blue) — ResNet50 preprocessing/CV variations:
-      leaky CV, GT crop, U-Net crop  (all 2.5x scale; 1.1x dropped from labels)
-      Sourced from v3 phase 2 'classic_test_auc' (single-mode image-only).
+  Block 2 (blue) -- ResNet50 preprocessing/CV variations:
+      Anonymous CV, GT crop, U-Net crop  (disc crops use margin 2.5x)
+      "Anonymous CV" = patient-identity-agnostic cross-validation: fold
+      assignment ignores PAPILA's patient IDs, allowing the same patient's
+      OD/OS pair to be split across train and test. Reflects the standard
+      protocol in benchmark reports that do not have patient-level labels
+      (or do not respect them).
+      Sourced from v4 experiments/backbone_replication/{anonymous_cv,gtcrop,
+      unetcrop}_refugelike.
 
-  Block 3 (orange) — Baseline reference:
-      "Baseline (fine-tuned ResNet50)" — what we previously called refugelike.
-      Sourced from v3 phase 2 imageonly_refugelike_proper.
+  Block 3 (orange) -- Baseline reference:
+      "Baseline (fine-tuned ResNet50)" -- REFUGE-pretrained R50 image-only,
+      sourced from v4 experiments/refuge_v2m_baseline/img_solo_single_refugelike.
 
 Each non-baseline box is labelled with a Wilcoxon two-sided p-value comparing
-its fold AUCs to the baseline.
+its fold-rep AUCs to the baseline fold-rep AUCs.
 
 Re-run anytime:
     python -m v4.figures.F2_papila_replication_and_single_mode
 """
 from __future__ import annotations
 
+import json
 from pathlib import Path
 
 import matplotlib
 matplotlib.use("Agg")
 import matplotlib.pyplot as plt
 import numpy as np
-import pandas as pd
 from scipy.stats import wilcoxon
 
-from v4.figures.util.loaders import REPO_ROOT
+from v4.figures.util.loaders import RESULTS_ROOT
 
 OUT = Path(__file__).parent / "output" / "F2_backbones.png"
 
-# ── Colors / styling (mirrors v3 phase2_analysis) ────────────────────────────
-C_VAR     = "#4c72b0"   # blue   — non-baseline boxes (basic backbones + variants)
-C_BASE    = "#dd8452"   # orange — baseline reference box
-C_MEDIAN  = "#c44e52"   # red    — median line inside boxes
+# Colors / styling (mirrors v3 phase2_analysis)
+C_VAR     = "#4c72b0"   # blue   - non-baseline boxes
+C_BASE    = "#dd8452"   # orange - baseline reference box
+C_MEDIAN  = "#c44e52"   # red    - median line inside boxes
 ALPHA     = 0.82
 
-V3_PHASE1_DIR = REPO_ROOT / "v3" / "results" / "phase1"
-V3_PHASE2_DIR = REPO_ROOT / "v3" / "results" / "phase2"
+# Stage key for img-only single-eye fusion
+STAGE_KEY = "img_fuse_test_auc"
 
 
 def _wilcoxon_p(a: np.ndarray, b: np.ndarray) -> float:
@@ -57,67 +63,64 @@ def _wilcoxon_p(a: np.ndarray, b: np.ndarray) -> float:
         return float("nan")
 
 
-def _load_phase1_fold_aucs(subdir: str) -> np.ndarray:
-    fp = V3_PHASE1_DIR / subdir / "fold_metrics.csv"
-    if not fp.exists():
-        return np.array([])
-    df = pd.read_csv(fp)
-    return df["auc"].dropna().astype(float).values
-
-
-def _load_phase2_classic_aucs(run_name: str) -> np.ndarray:
-    """Collect classic_test_auc across all rep×fold for a phase 2 run folder."""
-    root = V3_PHASE2_DIR / run_name
+def _load_fold_aucs(rel: str) -> np.ndarray:
+    """Collect STAGE_KEY across all rep x fold for a v4 results subdirectory."""
+    root = RESULTS_ROOT / rel
     if not root.exists():
         return np.array([])
     out: list[float] = []
-    for rep in sorted(root.glob("rep*")):
-        fp = rep / "binary" / "single" / "fold_results.csv"
-        if not fp.exists(): continue
-        df = pd.read_csv(fp)
-        if "classic_test_auc" not in df.columns: continue
-        out.extend(df["classic_test_auc"].dropna().astype(float).tolist())
+    for s in sorted(root.glob("rep*/binary/summary.json")):
+        d = json.loads(s.read_text())
+        for fr in d.get("fold_results", []):
+            v = fr.get(STAGE_KEY)
+            if v is None or not np.isfinite(v):
+                continue
+            out.append(float(v))
     return np.array(out)
 
 
-# ── Per-section data definitions ─────────────────────────────────────────────
-#   Each entry: (label, loader_fn, *args)
+# Per-section data definitions (label, results-subdir under RESULTS_ROOT)
 
 BASIC_BACKBONES = [
-    ("VGG16",       _load_phase1_fold_aucs, "cnn_vgg16"),
-    ("MobileNetV2", _load_phase1_fold_aucs, "cnn_mobilenet_v2"),
-    ("DenseNet121", _load_phase1_fold_aucs, "cnn_densenet121"),
-    ("InceptionV3", _load_phase1_fold_aucs, "cnn_inception_v3"),
-    # Use phase 2 ResNet50 (50 fold AUCs) for tighter statistics on the
-    # backbone that we sweep variations of in block 2.
-    ("ResNet50",    _load_phase2_classic_aucs, "imageonly_resnet50_proper"),
+    ("VGG16",       "backbone_replication/basic_vgg16"),
+    ("MobileNetV2", "backbone_replication/basic_mobilenet_v2"),
+    ("DenseNet121", "backbone_replication/basic_densenet121"),
+    ("InceptionV3", "backbone_replication/basic_inception_v3"),
+    ("ResNet50",    "backbone_replication/basic_resnet50"),
 ]
 
 RESNET_VARIATIONS = [
-    ("leaky CV",   _load_phase2_classic_aucs, "imageonly_resnet50_leaky"),
-    ("GT crop",    _load_phase2_classic_aucs, "imageonly_resnet50_gtcrop_2.5"),
-    ("U-Net crop", _load_phase2_classic_aucs, "imageonly_resnet50_unetcrop_2.5"),
+    ("Anonymous CV", "backbone_replication/anonymous_cv_refugelike"),
+    ("GT crop",      "backbone_replication/gtcrop_refugelike"),
+    ("U-Net crop",   "backbone_replication/unetcrop_refugelike"),
 ]
 
 BASELINE_LABEL = "baseline\n(fine-tuned ResNet50)"
-BASELINE_DATA  = (_load_phase2_classic_aucs, "imageonly_refugelike_proper")
+BASELINE_REL   = "refuge_v2m_baseline/img_solo_single_refugelike"
 
 
 def render() -> None:
-    # Load everything
-    block1 = [(lbl, fn(arg)) for lbl, fn, arg in BASIC_BACKBONES]
-    block2 = [(lbl, fn(arg)) for lbl, fn, arg in RESNET_VARIATIONS]
-    base_fn, base_arg = BASELINE_DATA
-    base_aucs = base_fn(base_arg)
+    block1 = [(lbl, _load_fold_aucs(rel)) for lbl, rel in BASIC_BACKBONES]
+    block2 = [(lbl, _load_fold_aucs(rel)) for lbl, rel in RESNET_VARIATIONS]
+    base_aucs = _load_fold_aucs(BASELINE_REL)
 
-    print("Block 1 — Basic backbones:")
+    print("Block 1 - Basic backbones (ImageNet pretraining):")
     for lbl, a in block1:
-        print(f"  {lbl:<14s} n={len(a):>3d}  mean={a.mean():.3f}±{a.std():.3f}" if len(a) else f"  {lbl:<14s} no data")
-    print("Block 2 — ResNet50 variations:")
+        if len(a):
+            print(f"  {lbl:<14s} n={len(a):>3d}  mean={a.mean():.4f} +/- {a.std():.4f}")
+        else:
+            print(f"  {lbl:<14s} no data")
+    print("Block 2 - ResNet50 (REFUGE) variations:")
     for lbl, a in block2:
-        print(f"  {lbl:<14s} n={len(a):>3d}  mean={a.mean():.3f}±{a.std():.3f}" if len(a) else f"  {lbl:<14s} no data")
-    print(f"Block 3 — Baseline: n={len(base_aucs)}  "
-          f"mean={base_aucs.mean():.3f}±{base_aucs.std():.3f}" if len(base_aucs) else "Block 3 — no baseline data")
+        if len(a):
+            print(f"  {lbl:<14s} n={len(a):>3d}  mean={a.mean():.4f} +/- {a.std():.4f}")
+        else:
+            print(f"  {lbl:<14s} no data")
+    if len(base_aucs):
+        print(f"Block 3 - Baseline: n={len(base_aucs)}  "
+              f"mean={base_aucs.mean():.4f} +/- {base_aucs.std():.4f}")
+    else:
+        print("Block 3 - no baseline data")
 
     # Lay out positions
     gap = 0.7
@@ -135,7 +138,6 @@ def render() -> None:
     section3_left = p
     pos.append(p)
     section3_right = p
-    total_w = p + 0.6
 
     fig, ax = plt.subplots(figsize=(13, 5.8))
     fig.suptitle("Backbone Selection", fontsize=13, fontweight="bold")
@@ -156,10 +158,10 @@ def render() -> None:
         all_labels.append(lbl); all_aucs.append(a); all_colors.append(C_VAR)
     all_labels.append(BASELINE_LABEL); all_aucs.append(base_aucs); all_colors.append(C_BASE)
 
-    # Draw boxes
     for x, aucs, color in zip(pos, all_aucs, all_colors):
-        if not len(aucs): continue
-        bp = ax.boxplot(
+        if not len(aucs):
+            continue
+        ax.boxplot(
             aucs, positions=[x], widths=box_w, patch_artist=True, manage_ticks=False,
             boxprops=dict(facecolor=color, alpha=ALPHA, **boxprops_kw),
             medianprops=medianprops,
@@ -168,31 +170,27 @@ def render() -> None:
             flierprops=flierprops,
         )
 
-    # Baseline median reference line spanning the variant blocks
     if len(base_aucs):
         ax.axhline(np.median(base_aucs),
                    color=C_BASE, linewidth=1.2, linestyle="--", alpha=0.55,
                    label="Baseline median")
 
-    # Dividers between sections (vertical light lines)
     div1 = (section1_right + section2_left) / 2
     div2 = (section2_right + section3_left) / 2
     for d in (div1, div2):
         ax.axvline(d, color="#aaa", linewidth=0.7, alpha=0.65, linestyle="-")
 
-    # Section labels just above each block
     y_band = 1.02
     section_centers = [
-        ((pos[0] + section1_right) / 2,                "Basic backbones (img-only, single)"),
-        ((section2_left + section2_right) / 2,          "ResNet50 variations"),
-        ((section3_left + section3_right) / 2,          "Baseline"),
+        ((pos[0] + section1_right) / 2,        "Basic backbones (img-only, single)"),
+        ((section2_left + section2_right) / 2, "ResNet50 variations"),
+        ((section3_left + section3_right) / 2, "Baseline"),
     ]
     for cx, txt in section_centers:
         ax.text(cx, y_band, txt, ha="center", va="bottom",
                 fontsize=10, color="#333", fontweight="bold",
                 transform=ax.get_xaxis_transform())
 
-    # X-tick labels (with p-values vs baseline beneath each variant box)
     tick_labels = []
     for lbl, aucs, color in zip(all_labels, all_aucs, all_colors):
         if color == C_BASE or not len(aucs) or not len(base_aucs):

v4/figures/F3_hyperfeature_ablation.py

@@ -58,9 +58,9 @@ SEV_COLORS = {
     "unknown":  C_UNKNOWN,
 }
 
-SEV_ORDER = ["normal", "unknown", "early", "moderate", "severe"]
-SEV_ALPHA = {"normal": 0.40, "unknown": 0.35, "early": 0.55, "moderate": 0.70, "severe": 0.85}
-SEV_SIZE  = {"normal": 6,    "unknown": 6,    "early": 8,    "moderate": 10, "severe": 12}
+SEV_ORDER = ["severe", "moderate", "unknown", "early", "normal"]
+SEV_ALPHA = {"normal": 0.55, "unknown": 0.55, "early": 0.55, "moderate": 0.55, "severe": 0.55}
+SEV_SIZE  = {"normal": 8,    "unknown": 8,    "early": 8,    "moderate": 8,    "severe": 8}
 
 # ── Per-panel definitions: (label, results dir, eval_stage) ──────────────────
 # Top row: single-modality reference runs

v4/figures/F3b_anonymous_cv_roc.py

@@ -0,0 +1,155 @@
+"""F3b - Hadamard L1 fusion ROC: patient-grouped vs anonymous CV (overlay).
+
+Single panel overlaying the ROC of the same single-eye img+cd Hadamard L1
+fusion configuration evaluated under patient-grouped 5-fold CV (the headline
+protocol) and patient-anonymous 5-fold CV (the prevailing benchmark protocol).
+Both runs use matched seeds, matched backbones, matched training schedules;
+only the fold-grouping rule changes.
+
+For each configuration the figure shows:
+  - per-fold-rep ROC curves as faint coloured lines (50 curves per condition)
+  - mean ROC across fold-reps with a shaded SD band
+  - the rep-mean test AUC ± SD in a corner annotation
+
+Re-run:
+    python -m v4.figures.F3b_anonymous_cv_roc
+"""
+from __future__ import annotations
+
+import warnings
+warnings.filterwarnings("ignore")
+
+from pathlib import Path
+
+import h5py
+import matplotlib
+matplotlib.use("Agg")
+import matplotlib.pyplot as plt
+import numpy as np
+from sklearn.metrics import roc_auc_score, roc_curve
+
+from v4.figures.util.loaders import RESULTS_ROOT
+
+
+OUT = Path(__file__).parent / "output" / "F3b_anonymous_cv_roc.png"
+
+CONDITIONS = [
+    ("Patient-grouped CV",
+     RESULTS_ROOT / "refuge_v2m_baseline" / "ensemble_single_refugelike",
+     "nt", "#1f6fb0"),
+    ("Anonymous CV",
+     RESULTS_ROOT / "backbone_replication" / "anonymous_cv_ensemble_single_refugelike",
+     "nt", "#c44e52"),
+]
+
+# Common FPR grid for per-fold-rep ROC interpolation
+FPR_GRID = np.linspace(0.0, 1.0, 201)
+
+
+def collect_per_foldrep(run_dir: Path, eval_stage: str):
+    """Return list of (y_true, y_score) tuples, one per (rep, fold)."""
+    per: list[tuple[np.ndarray, np.ndarray]] = []
+    for rep in sorted(run_dir.glob("rep*")):
+        fp = next(iter(rep.rglob("predictions.h5")), None)
+        if fp is None:
+            continue
+        with h5py.File(fp, "r") as f:
+            if eval_stage not in f:
+                continue
+            grp = f[eval_stage]
+            logits = grp["logits"][:]
+            y_true = grp["y_true"][:].astype(int)
+            split = grp["split"][:]
+            n_folds, n_epochs, _, n_heads, n_outputs = logits.shape
+            if n_outputs != 2:
+                continue
+            ep, head = n_epochs - 1, n_heads - 1
+            for fold in range(n_folds):
+                labels = np.array(
+                    [s.decode() if isinstance(s, bytes) else str(s) for s in split[fold]]
+                )
+                test_mask = labels == "test"
+                if not test_mask.any():
+                    continue
+                lg = logits[fold, ep, test_mask, head, :]
+                e = np.exp(lg - lg.max(axis=1, keepdims=True))
+                p = e / e.sum(axis=1, keepdims=True)
+                y = y_true[test_mask]
+                s = p[:, 1]
+                per.append((y, s))
+    return per
+
+
+def interp_tpr(y: np.ndarray, s: np.ndarray) -> np.ndarray:
+    if len(np.unique(y)) < 2:
+        return np.full_like(FPR_GRID, np.nan, dtype=float)
+    fpr, tpr, _ = roc_curve(y, s)
+    return np.interp(FPR_GRID, fpr, tpr)
+
+
+def render() -> None:
+    fig, ax = plt.subplots(figsize=(7.4, 6.4))
+
+    # Diagonal reference first so it sits behind everything
+    ax.plot([0, 1], [0, 1], color="#aaa", linewidth=0.8, linestyle=":", zorder=1)
+
+    annotations = []
+
+    for label, run_dir, stage, color in CONDITIONS:
+        per = collect_per_foldrep(run_dir, stage)
+        if not per:
+            continue
+
+        tprs = np.array([interp_tpr(y, s) for (y, s) in per])
+        valid = ~np.isnan(tprs).any(axis=1)
+        tprs = tprs[valid]
+
+        per_aucs = np.array(
+            [roc_auc_score(y, s) for (y, s) in per if len(np.unique(y)) >= 2]
+        )
+        rep_means = (per_aucs.reshape(-1, 5).mean(axis=1)
+                     if len(per_aucs) % 5 == 0 else per_aucs)
+
+        # Per-fold-rep curves
+        for (y, s) in per:
+            if len(np.unique(y)) < 2:
+                continue
+            fpr, tpr, _ = roc_curve(y, s)
+            ax.plot(fpr, tpr, color=color, linewidth=0.4, alpha=0.13, zorder=2)
+
+        # Mean ± SD band
+        mean_tpr = tprs.mean(axis=0)
+        sd_tpr = tprs.std(axis=0)
+        ax.fill_between(
+            FPR_GRID, np.clip(mean_tpr - sd_tpr, 0, 1),
+            np.clip(mean_tpr + sd_tpr, 0, 1),
+            color=color, alpha=0.20, zorder=3,
+        )
+        ax.plot(
+            FPR_GRID, mean_tpr, color=color, linewidth=2.2, zorder=4,
+            label=f"{label}  (AUC = {rep_means.mean():.3f} ± {rep_means.std():.3f})",
+        )
+
+        annotations.append((label, rep_means))
+
+    ax.set_xlim(0, 1)
+    ax.set_ylim(0, 1)
+    ax.set_xlabel("False Positive Rate", fontsize=11)
+    ax.set_ylabel("True Positive Rate", fontsize=11)
+    ax.set_title(
+        "Hadamard L1 fusion ROC under matched architecture,\n"
+        "patient-grouped vs anonymous cross-validation",
+        fontsize=12, fontweight="bold",
+    )
+    ax.grid(alpha=0.25, linestyle="--")
+    ax.legend(loc="lower right", fontsize=10, framealpha=0.94)
+
+    fig.tight_layout()
+    OUT.parent.mkdir(parents=True, exist_ok=True)
+    fig.savefig(OUT, dpi=180, bbox_inches="tight")
+    plt.close(fig)
+    print(f"saved {OUT}")
+
+
+if __name__ == "__main__":
+    render()

v4/figures/F4_bilateral.py

@@ -58,15 +58,15 @@ SEV_LABELS = {
     "severe": "Glaucoma — severe (VF_MD < −12)",
     "unknown": "Glaucoma — VF_MD not recorded",
 }
-SEV_ORDER = ["normal", "unknown", "early", "moderate", "severe"]
+SEV_ORDER = ["severe", "moderate", "unknown", "early", "normal"]
 SEV_ALPHA = {
-    "normal": 0.40,
-    "unknown": 0.35,
+    "normal": 0.55,
+    "unknown": 0.55,
     "early": 0.55,
-    "moderate": 0.70,
-    "severe": 0.85,
+    "moderate": 0.55,
+    "severe": 0.55,
 }
-SEV_SIZE = {"normal": 6, "unknown": 6, "early": 8, "moderate": 10, "severe": 12}
+SEV_SIZE = {"normal": 8, "unknown": 8, "early": 8, "moderate": 8, "severe": 8}
 
 # Panel grid: [row][col] = (label, run_dir, eval_stage)
 GRID = [

v4/figures/F6_regression.py

@@ -27,7 +27,10 @@ from sklearn.metrics import roc_curve, roc_auc_score
 from v4.figures.util.loaders import RESULTS_ROOT
 
 OUT = Path(__file__).parent / "output" / "F6_regression.png"
-RUN_DIR = RESULTS_ROOT / "reg_head" / "baseline_reg_nt50"
+# Points at the post-fix run that stores VF_MD as float64. The earlier
+# baseline_reg_nt50 run stored y_true as int64, silently rounding the
+# regression targets; do not mix the two.
+RUN_DIR = RESULTS_ROOT / "reg_head" / "baseline_reg_nt50_floaty"
 
 # Prediction-side bin boundaries
 NP_THRESH = -1.097  # mean of measured-healthy MD

v4/figures/F8_attention_combined.py

@@ -0,0 +1,72 @@
+"""F8 combined explainability panel: disc-centred attention + quadrant breakdown.
+
+Composes a single A/B figure from two existing renderings:
+    A: ``F8_gradcam/disc_attention_detail.png`` — 2x2 grid of mean Grad-CAM
+       heatmaps for {correct, incorrect} x {Normal, Glaucoma} cells, with the
+       mean disc boundary annotated as a dashed circle.
+    B: ``F8_quadrant_attention.png`` — grouped-bar chart of mean full-image
+       Grad-CAM fraction per optic-disc quadrant, by cell.
+
+Both source panels are produced by ``v4.figures.F8_explainability`` and
+``v4.figures.F8_quadrant_plot`` respectively; this script just stitches the
+two PNGs into a single combined figure with A/B subfigure labels.
+
+Re-run:
+    python -m v4.figures.F8_attention_combined
+"""
+from __future__ import annotations
+
+from pathlib import Path
+
+import matplotlib
+matplotlib.use("Agg")
+import matplotlib.pyplot as plt
+from PIL import Image
+
+
+SRC_A = Path(__file__).parent / "output" / "F8_gradcam" / "disc_attention_detail.png"
+SRC_B = Path(__file__).parent / "output" / "F8_quadrant_attention.png"
+OUT   = Path(__file__).parent / "output" / "F8_attention_combined.png"
+
+
+def render() -> None:
+    for p in (SRC_A, SRC_B):
+        if not p.exists():
+            raise SystemExit(
+                f"Source panel missing: {p}\n"
+                "Run F8_explainability (for A) and F8_quadrant_plot (for B) first."
+            )
+
+    img_a = Image.open(SRC_A)
+    img_b = Image.open(SRC_B)
+
+    # Stack vertically: A on top (square), B below (wider).
+    fig = plt.figure(figsize=(13.0, 13.6))
+    gs = fig.add_gridspec(
+        2, 1,
+        height_ratios=[img_a.size[1] / img_a.size[0],
+                       img_b.size[1] / img_b.size[0] * 13.0 / 13.0],
+        hspace=0.06,
+    )
+
+    ax_a = fig.add_subplot(gs[0])
+    ax_a.imshow(img_a)
+    ax_a.axis("off")
+    ax_a.text(-0.01, 1.01, "A", transform=ax_a.transAxes,
+              ha="left", va="bottom", fontsize=22, fontweight="bold")
+
+    ax_b = fig.add_subplot(gs[1])
+    ax_b.imshow(img_b)
+    ax_b.axis("off")
+    ax_b.text(-0.01, 1.01, "B", transform=ax_b.transAxes,
+              ha="left", va="bottom", fontsize=22, fontweight="bold")
+
+    fig.tight_layout()
+    OUT.parent.mkdir(parents=True, exist_ok=True)
+    fig.savefig(OUT, dpi=180, bbox_inches="tight")
+    plt.close(fig)
+    print(f"saved {OUT}")
+
+
+if __name__ == "__main__":
+    render()

v4/figures/F8_explainability.py

@@ -1,8 +1,10 @@
-"""F8 - Explainability figures from the V2-M checkpointed v4 run.
+"""F8 - Explainability figures from the R50 checkpointed v4 run.
 
 Sources predictions and Grad-CAM panels exclusively from the
-``experiments/explainability/ensemble_v2m_ckpt`` run (img+cd ensemble with the
-refuge_efficientnet_v2_m backbone, save_checkpoints=true).
+``experiments/explainability/ensemble_refugelike_ckpt`` run (img+cd ensemble
+with the refugelike R50 backbone, save_checkpoints=true). rep00 (seed=1234)
+is the single rep used for the figure; matches the headline configuration in
+section 3.
 
 GradCAM machinery lives in ``v4.classes.accessory.explainability``; PAPILA
 specific knowledge (disc contour rasterisation, OS→OD orientation flip) is
@@ -33,7 +35,7 @@ from v4.figures.util.loaders import REPO_ROOT
 
 OUT_DIR = Path(__file__).parent / "output"
 GRADCAM_DIR = OUT_DIR / "F8_gradcam"
-V4_CKPT_RUN = REPO_ROOT / "v4" / "results" / "experiments" / "explainability" / "ensemble_v2m_ckpt" / "binary"
+V4_CKPT_RUN = REPO_ROOT / "v4" / "results" / "experiments" / "explainability" / "ensemble_refugelike_ckpt" / "rep00" / "binary"
 
 LABEL_NAMES = {0: "Normal", 1: "Glaucoma"}
 EVENT_ORDER = [
@@ -43,11 +45,11 @@ EVENT_ORDER = [
 ]
 EVENT_LABELS = {
     "full_correction": "Both wrong -> fused right",
-    "img_assist": "Image right, MD wrong",
-    "md_assist": "MD right, image wrong",
+    "img_assist": "Image right, clinical wrong",
+    "md_assist": "Clinical right, image wrong",
     "full_error": "Both right -> fused wrong",
-    "img_drag": "MD right, image wrong -> fused wrong",
-    "md_drag": "Image right, MD wrong -> fused wrong",
+    "img_drag": "Clinical right, image wrong -> fused wrong",
+    "md_drag": "Image right, clinical wrong -> fused wrong",
     "concordant_correct": "All correct",
     "concordant_wrong": "All wrong",
 }
@@ -339,6 +341,8 @@ def make_fusion_event_panel(split: str = "test") -> None:
     ax.invert_yaxis()
     ax.set_xlabel("Count")
     ax.set_title("Fusion event taxonomy", fontsize=10, fontweight="bold")
+    max_count = max(display_counts[k] for k in bars) if bars else 0
+    ax.set_xlim(0, max_count * 1.10 + 1)
     for yi, k in enumerate(bars):
         ax.text(display_counts[k] + 0.8, yi, str(int(display_counts[k])),
                 va="center", fontsize=8)
@@ -346,7 +350,7 @@ def make_fusion_event_panel(split: str = "test") -> None:
     ax = fig.add_subplot(gs[0, 1])
     per_fold = pd.DataFrame(
         {
-            "fold": [f"{r}/{f}" for (r, f), _ in fold_groups],
+            "fold": [str(f) for (_, f), _ in fold_groups],
             "positive": [sum((g["event_type"] == k).sum() for k in positive_keys) for _, g in fold_groups],
             "negative": [sum((g["event_type"] == k).sum() for k in negative_keys) for _, g in fold_groups],
         }
@@ -437,10 +441,6 @@ def make_fusion_event_panel(split: str = "test") -> None:
     ax.legend(handles=point_handles + shade_handles, ncol=5, fontsize=7,
               loc="upper center", bbox_to_anchor=(0.5, -0.14), frameon=False)
 
-    fig.suptitle(
-        f"S8a - Checkpoint Fusion Events ({split}; AUC={auc:.3f}, n={len(df)})",
-        fontsize=12, fontweight="bold",
-    )
     out = OUT_DIR / "S8a_comparison_panel.png"
     fig.savefig(out, dpi=180, bbox_inches="tight")
     plt.close(fig)
@@ -450,7 +450,7 @@ def make_fusion_event_panel(split: str = "test") -> None:
 def make_clinical_importance(n_permutations: int = 30, seed: int = 0) -> None:
     """S8e clinical permutation importance via the cd-tower → cd_aux head.
 
-    Isolates the clinical-only prediction path at the V2-M ckpt run, then
+    Isolates the clinical-only prediction path at the R50 ckpt run, then
     column-shuffles the encoded clinical vector to measure per-feature AUC
     drop. Per-original-column grouping comes from
     ``ClinicalDataView.feature_groups`` (one-hot encoded dims for a
@@ -590,7 +590,7 @@ def make_clinical_importance(n_permutations: int = 30, seed: int = 0) -> None:
     ax.set_xlabel("Mean AUC drop on shuffling (averaged across folds)", fontsize=10)
     ax.axvline(0, color="black", linewidth=0.7)
     ax.set_title(
-        f"S8e — Clinical permutation importance (cd-only head, V2-M ckpt run)\n"
+        f"S8e — Clinical permutation importance (cd-only head, R50 ckpt run)\n"
         f"baseline AUC = {baseline_mean:.3f}; n_permutations = {n_permutations}",
         fontsize=10, fontweight="bold",
     )
@@ -692,6 +692,60 @@ def _disc_centred_patch_array(
     return patch_out.astype(np.float32), out * disc_r / (2 * half)
 
 
+QUAD_ORDER = ("ST", "SN", "IT", "IN")  # superotemporal, superonasal, inferotemporal, inferonasal
+
+
+def _quadrant_fractions(
+    cam: np.ndarray,
+    disc_mask: np.ndarray,
+    *,
+    peri_inner: float = 1.0,
+    peri_outer: float = 2.0,
+) -> tuple[dict[str, float], dict[str, float], dict[str, float]] | tuple[None, None, None]:
+    """Per-quadrant Grad-CAM fractions in OD-oriented coordinates, for three
+    region scopes.
+
+    Quadrant boundaries are the disc-mask centroid (cx, cy). In the OD-oriented
+    frame nasal is left (x < cx) and temporal is right (x > cx); superior is
+    top (y < cy) and inferior is bottom (y > cy):
+
+        ST = x > cx,  y < cy
+        SN = x < cx,  y < cy
+        IT = x > cx,  y > cy
+        IN = x < cx,  y > cy
+
+    Three region scopes are returned:
+        disc_q : fractions of CAM intensity that fall inside the GT disc mask
+        peri_q : fractions inside a peri-disc annulus of disc-radius units
+                 (peri_inner to peri_outer, default 1x-2x), excluding the disc
+        full_q : fractions over the entire image
+    Each dict sums to 1 (within floating-point error). Returns (None, None, None)
+    if the disc mask is empty.
+    """
+    if disc_mask is None or disc_mask.sum() == 0:
+        return None, None, None
+    ys, xs = np.where(disc_mask)
+    cy = float(ys.mean()); cx = float(xs.mean())
+    disc_r = float(np.sqrt(disc_mask.sum() / np.pi))
+    h, w = cam.shape
+    yy, xx = np.mgrid[0:h, 0:w]
+    dist = np.sqrt((xx - cx) ** 2 + (yy - cy) ** 2)
+    peri_mask = (dist >= peri_inner * disc_r) & (dist <= peri_outer * disc_r) & ~disc_mask
+    quads = {
+        "ST": (xx > cx) & (yy < cy),
+        "SN": (xx < cx) & (yy < cy),
+        "IT": (xx > cx) & (yy > cy),
+        "IN": (xx < cx) & (yy > cy),
+    }
+    disc_total = float(cam[disc_mask].sum()) + 1e-8
+    peri_total = float(cam[peri_mask].sum()) + 1e-8
+    full_total = float(cam.sum()) + 1e-8
+    disc_q = {k: float(cam[disc_mask & q].sum()) / disc_total for k, q in quads.items()}
+    peri_q = {k: float(cam[peri_mask & q].sum()) / peri_total for k, q in quads.items()}
+    full_q = {k: float(cam[q].sum())             / full_total for k, q in quads.items()}
+    return disc_q, peri_q, full_q
+
+
 def _annotate_nasal_temporal(ax, *, fontsize: int = 9, color: str = "white",
                              pad: float = 2.5) -> None:
     """Label the disc-side (nasal) and macula-side (temporal) edges of an
@@ -868,6 +922,10 @@ def _make_oriented_gradcam(n_grid: int = 16, alpha: float = 0.45,
     disc_patch_count: dict[tuple[str, str], int] = {}
     disc_radius_sum: dict[tuple[str, str], float] = {}
     disc_frac_sum: dict[tuple[str, str], float] = {}
+    # Per-eye quadrant fractions for three region scopes; aggregated per cell.
+    quad_disc_list: dict[tuple[str, str], list[dict[str, float]]] = {}
+    quad_peri_list: dict[tuple[str, str], list[dict[str, float]]] = {}
+    quad_full_list: dict[tuple[str, str], list[dict[str, float]]] = {}
     examples: dict[tuple[str, str], tuple[np.ndarray, int, str, int]] = {}
 
     fold_range = range(cfg.get("folds", 5))
@@ -927,6 +985,11 @@ def _make_oriented_gradcam(n_grid: int = 16, alpha: float = 0.45,
                     disc_frac_sum[key] = disc_frac_sum.get(key, 0.0) + float(
                         cam_np[roi_mask].sum() / (cam_np.sum() + 1e-8)
                     )
+                    disc_q, peri_q, full_q = _quadrant_fractions(cam_np, roi_mask)
+                    if disc_q is not None:
+                        quad_disc_list.setdefault(key, []).append(disc_q)
+                        quad_peri_list.setdefault(key, []).append(peri_q)
+                        quad_full_list.setdefault(key, []).append(full_q)
                     if key not in examples:
                         ov = overlay_gradcam(pil_oriented, cam_np, alpha)
                         ov_small = np.array(ov.resize(cam_np.shape[::-1], Image.BILINEAR))
@@ -1020,6 +1083,32 @@ def _make_oriented_gradcam(n_grid: int = 16, alpha: float = 0.45,
     if mean_patches:
         _make_oriented_disc_detail(mean_patches, examples, GRADCAM_DIR / "disc_attention_detail.png")
 
+    # Per-quadrant CAM fractions (within-disc and full-image scopes).
+    # One CSV row per (class, outcome, scope, quadrant) cell, with mean and SD
+    # computed over the per-eye fractions in that cell.
+    rows = []
+    for key in sorted(quad_disc_list.keys()):
+        cls_name, outcome = key
+        n_eyes = len(quad_disc_list[key])
+        for scope_label, scope_list in (("disc", quad_disc_list[key]),
+                                        ("peri", quad_peri_list[key]),
+                                        ("full", quad_full_list[key])):
+            for q in QUAD_ORDER:
+                vals = np.array([d[q] for d in scope_list], dtype=np.float64)
+                rows.append({
+                    "class":    cls_name,
+                    "outcome":  outcome,
+                    "scope":    scope_label,
+                    "quadrant": q,
+                    "n_eyes":   n_eyes,
+                    "mean":     float(vals.mean()),
+                    "sd":       float(vals.std(ddof=1)) if n_eyes > 1 else float("nan"),
+                })
+    if rows:
+        out_csv = OUT_DIR / "F8_quadrant_fractions.csv"
+        pd.DataFrame(rows).to_csv(out_csv, index=False)
+        print(f"saved quadrant fractions: {out_csv}")
+
 
 def make_oriented_gradcam(n_grid: int = 16, alpha: float = 0.45,
                           target_class: int | None = None) -> None:

v4/figures/F8_quadrant_plot.py

@@ -0,0 +1,123 @@
+"""F8 quadrant attention chart (full-image scope).
+
+Reads the per-cell quadrant fractions produced by
+``v4.figures.F8_explainability`` (see CSV at
+``output/F8_quadrant_fractions.csv``) and renders a single-panel grouped bar
+chart of full-image Grad-CAM intensity by optic-disc quadrant. Within-disc
+and peri-disc scopes are present in the CSV but are not plotted here; see
+the CSV for the per-cell numbers if you need them.
+
+Re-run:
+    python -m v4.figures.F8_quadrant_plot
+"""
+from __future__ import annotations
+
+from pathlib import Path
+
+import matplotlib
+matplotlib.use("Agg")
+import matplotlib.pyplot as plt
+import numpy as np
+import pandas as pd
+
+
+CSV  = Path(__file__).parent / "output" / "F8_quadrant_fractions.csv"
+OUT  = Path(__file__).parent / "output" / "F8_quadrant_attention.png"
+
+QUAD_ORDER = ("ST", "SN", "IT", "IN")
+QUAD_LABEL = {
+    "ST": "Superotemporal",
+    "SN": "Superonasal",
+    "IT": "Inferotemporal",
+    "IN": "Inferonasal",
+}
+
+CELL_ORDER = [
+    ("Normal",   "correct"),
+    ("Normal",   "incorrect"),
+    ("Glaucoma", "correct"),
+    ("Glaucoma", "incorrect"),
+]
+CELL_COLOR = {
+    ("Normal",   "correct"):   "#3B6FB5",
+    ("Normal",   "incorrect"): "#8BB0DA",
+    ("Glaucoma", "correct"):   "#c44e52",
+    ("Glaucoma", "incorrect"): "#e6a3a4",
+}
+CELL_LABEL = {
+    ("Normal",   "correct"):   "Normal correct",
+    ("Normal",   "incorrect"): "Normal incorrect",
+    ("Glaucoma", "correct"):   "Glaucoma correct",
+    ("Glaucoma", "incorrect"): "Glaucoma incorrect",
+}
+
+
+def render() -> None:
+    if not CSV.exists():
+        raise SystemExit(
+            f"CSV {CSV} not found. Run `python -m v4.figures.F8_explainability "
+            "--only-gradcam --run-gradcam` first."
+        )
+    df = pd.read_csv(CSV)
+    df_full = df[df["scope"] == "full"]
+
+    fig, ax = plt.subplots(figsize=(9.6, 6.0))
+
+    n_quad = len(QUAD_ORDER)
+    n_cell = len(CELL_ORDER)
+    bar_w  = 0.18
+    x      = np.arange(n_quad, dtype=float)
+
+    for i, cell in enumerate(CELL_ORDER):
+        means, sds = [], []
+        n_eyes = None
+        for q in QUAD_ORDER:
+            row = df_full[
+                (df_full["class"]    == cell[0])
+                & (df_full["outcome"] == cell[1])
+                & (df_full["quadrant"] == q)
+            ]
+            means.append(float(row["mean"].iloc[0]) if len(row) else float("nan"))
+            sds.append(float(row["sd"].iloc[0]) if len(row) else float("nan"))
+            if n_eyes is None and len(row):
+                n_eyes = int(row["n_eyes"].iloc[0])
+
+        offsets = (i - (n_cell - 1) / 2.0) * bar_w
+        bars = ax.bar(
+            x + offsets, means, width=bar_w,
+            yerr=sds, capsize=2,
+            color=CELL_COLOR[cell], alpha=0.92,
+            edgecolor="black", linewidth=0.6,
+            label=f"{CELL_LABEL[cell]} (n = {n_eyes})",
+            error_kw=dict(ecolor="#444", linewidth=0.8, capthick=0.8),
+        )
+        for rect, m in zip(bars, means):
+            if np.isnan(m):
+                continue
+            ax.text(rect.get_x() + rect.get_width() / 2, m + 0.005,
+                    f"{m:.2f}", ha="center", va="bottom",
+                    fontsize=8.5, color="#222")
+
+    ax.set_xticks(x)
+    ax.set_xticklabels([QUAD_LABEL[q] for q in QUAD_ORDER], fontsize=11)
+    ax.set_ylabel("Mean fraction of full-image Grad-CAM intensity", fontsize=11)
+    ax.set_title(
+        "Image-tower Grad-CAM by optic-disc quadrant (OD-oriented; centroid-split)",
+        fontsize=12.5, fontweight="bold",
+    )
+    ax.grid(axis="y", alpha=0.3, linestyle="--")
+    ax.set_ylim(0, max(ax.get_ylim()[1], 0.7))
+    ax.axhline(0.25, color="#888", linestyle=":", linewidth=0.8, alpha=0.6, zorder=0)
+
+    ax.legend(loc="upper center", bbox_to_anchor=(0.5, -0.10), ncol=4,
+              framealpha=0.94, fontsize=10)
+
+    fig.tight_layout(rect=(0, 0.04, 1, 0.98))
+    OUT.parent.mkdir(parents=True, exist_ok=True)
+    fig.savefig(OUT, dpi=180, bbox_inches="tight")
+    plt.close(fig)
+    print(f"saved {OUT}")
+
+
+if __name__ == "__main__":
+    render()

v4/figures/S2_variance_decomposition.py

@@ -0,0 +1,277 @@
+"""S2 - Variance decomposition of the four-bridge L1 fusion comparison.
+
+Two-panel supplementary figure summarising the variance decomposition
+reported alongside section 3.2 of the manuscript.
+
+Panel A (left): paired-line plot.
+    x-axis : the 4 bridge variants (Concat, Pairwise, Gated, Hadamard)
+    y-axis : eye-level test AUC
+    each line : one fold-rep, connecting that fold-rep's 4 bridge AUCs
+    overlay : per-bridge boxplot showing the marginal AUC distribution
+    annotation : pooled across-architecture and across-fold-rep SDs,
+                 and the SD ratio
+
+Panel B (right): centered-offset KDEs.
+    x-axis : AUC offset from grouping mean (centered at 0)
+    y-axis : density
+    four coloured curves : per-bridge fold-rep distributions (50 fold-reps
+                           per bridge, centered by subtracting each bridge's
+                           own mean)
+    dashed dark curve     : architectural offset distribution (200 values,
+                           centered by subtracting each fold-rep's mean)
+    annotation : variance ratio
+
+Read directly from v4/results/experiments/{phase3_v4,refuge_v2m_baseline}.
+
+Re-run:
+    python -m v4.figures.S2_variance_decomposition
+"""
+from __future__ import annotations
+
+import json
+from pathlib import Path
+
+import matplotlib
+matplotlib.use("Agg")
+import matplotlib.pyplot as plt
+import numpy as np
+import pandas as pd
+from scipy.stats import gaussian_kde
+
+from v4.figures.util.loaders import RESULTS_ROOT
+
+
+OUT = Path(__file__).parent / "output" / "S2_variance_decomposition.png"
+
+
+# Bridge label, results dir relative to experiments/, and stage key
+BRIDGES = [
+    ("Concat",   "phase3_v4/single_bcd_concat"),
+    ("Pairwise", "phase3_v4/single_bcd_pairwise"),
+    ("Gated",    "phase3_v4/single_bcd_gated"),
+    ("Hadamard", "refuge_v2m_baseline/ensemble_single_refugelike"),
+]
+STAGE_KEY = "nt_test_auc"
+
+
+# Panel-A colour palette (paired lines + boxplots)
+C_LINE        = "#1f6fb0"    # single blue for all paired-cell lines
+C_LINE_ALPHA  = 0.22
+C_MARKER      = "#1f6fb0"
+C_MEDIAN      = "#c44e52"    # red box median line
+C_BOX_FILL    = "#dbe6f0"    # pale blue box fill
+
+# Panel-B colour palette (per-bridge KDEs)
+C_ARCH        = "#222"       # dark grey for the architectural curve
+BRIDGE_COLORS = {
+    "Concat":   "#7f7f7f",
+    "Pairwise": "#ff7f0e",
+    "Gated":    "#2ca02c",
+    "Hadamard": "#1f77b4",
+}
+
+
+# ── Data loading + decomposition ────────────────────────────────────────────
+
+def collect() -> pd.DataFrame:
+    rows = []
+    for label, rel in BRIDGES:
+        root = RESULTS_ROOT / rel
+        for s in sorted(root.glob("rep*/binary/summary.json")):
+            rep = int(s.parents[1].name.replace("rep", ""))
+            d = json.loads(s.read_text())
+            for fr in d.get("fold_results", []):
+                v = fr.get(STAGE_KEY)
+                if v is None or not np.isfinite(v):
+                    continue
+                rows.append({
+                    "bridge": label,
+                    "rep":    rep,
+                    "fold":   int(fr["fold"]),
+                    "auc":    float(v),
+                })
+    return pd.DataFrame(rows)
+
+
+def decompose(df: pd.DataFrame) -> tuple[float, float, float, dict[str, float]]:
+    """Return (arch_sd_pooled, fold_sd_pooled, ratio, per_bridge_sd)."""
+    cell_var   = df.groupby(["rep", "fold"])["auc"].var(ddof=1)
+    bridge_var = df.groupby("bridge")["auc"].var(ddof=1)
+    arch_sd = float(np.sqrt(cell_var.mean()))
+    fold_sd = float(np.sqrt(bridge_var.mean()))
+    ratio   = fold_sd / arch_sd if arch_sd > 0 else float("inf")
+    per_bridge_sd = {b: float(np.sqrt(v)) for b, v in bridge_var.items()}
+    return arch_sd, fold_sd, ratio, per_bridge_sd
+
+
+# ── Panel A: paired-line plot ───────────────────────────────────────────────
+
+def draw_panel_a(ax, df: pd.DataFrame,
+                 arch_sd: float, fold_sd: float, ratio: float,
+                 n_cells: int) -> None:
+    bridge_order = [b for b, _ in BRIDGES]
+    pivot = df.pivot_table(
+        index=["rep", "fold"], columns="bridge", values="auc"
+    )[bridge_order]
+    x_positions = np.arange(len(bridge_order), dtype=float)
+
+    # Paired cell lines: one per fold-rep
+    for _, row in pivot.iterrows():
+        if row.isna().any():
+            continue
+        ax.plot(
+            x_positions, row.values, color=C_LINE, alpha=C_LINE_ALPHA,
+            linewidth=0.9, marker="o", markersize=2.0,
+            markerfacecolor=C_MARKER, markeredgecolor="none", zorder=2,
+        )
+
+    # Per-bridge boxplot
+    box_data = [pivot[b].dropna().values for b in bridge_order]
+    ax.boxplot(
+        box_data,
+        positions=x_positions,
+        widths=0.32,
+        patch_artist=True,
+        manage_ticks=False,
+        zorder=3,
+        boxprops=dict(facecolor=C_BOX_FILL, edgecolor="black",
+                      linewidth=1.0, alpha=0.85),
+        whiskerprops=dict(color="black", linewidth=0.9),
+        capprops=dict(color="black", linewidth=0.9),
+        medianprops=dict(color=C_MEDIAN, linewidth=1.8),
+        flierprops=dict(marker="", markersize=0),
+    )
+
+    ax.set_xticks(x_positions)
+    ax.set_xticklabels(bridge_order, fontsize=11)
+    ax.set_xlabel("L1 fusion bridge", fontsize=11)
+    ax.set_ylabel("Eye-level test AUC", fontsize=11)
+    ax.set_xlim(-0.5, len(bridge_order) - 0.5)
+    ax.grid(axis="y", alpha=0.3, linestyle="--")
+
+    txt = (
+        f"n = {n_cells} fold-rep AUC values | variance ratio {ratio:.2f}\n"
+        f"  across-architecture SD = {arch_sd:.3f}\n"
+        f"  across-fold-rep SD     = {fold_sd:.3f}"
+    )
+    ax.text(
+        0.985, 0.025, txt, transform=ax.transAxes,
+        ha="right", va="bottom", fontsize=9.5, family="monospace",
+        bbox=dict(boxstyle="round,pad=0.5", facecolor="white",
+                  edgecolor="#888", alpha=0.92),
+    )
+
+
+# ── Panel B: centered-offset KDE curves ─────────────────────────────────────
+
+def draw_panel_b(ax, df: pd.DataFrame,
+                 arch_sd: float, fold_sd: float, ratio: float,
+                 per_bridge_sd: dict[str, float]) -> None:
+    df = df.copy()
+    fold_rep_mean = df.groupby(["rep", "fold"])["auc"].transform("mean")
+    bridge_mean   = df.groupby("bridge")["auc"].transform("mean")
+    df["arch_offset"] = df["auc"] - fold_rep_mean
+    df["fold_offset"] = df["auc"] - bridge_mean
+
+    all_offsets = np.concatenate(
+        [df["arch_offset"].values, df["fold_offset"].values]
+    )
+    x_max = float(np.abs(all_offsets).max()) * 1.10
+    xs = np.linspace(-x_max, x_max, 600)
+
+    # Per-bridge fold-rep offset curves
+    for b in [name for name, _ in BRIDGES]:
+        offs = df.loc[df["bridge"] == b, "fold_offset"].values
+        kde  = gaussian_kde(offs)
+        y    = kde(xs)
+        sd   = per_bridge_sd[b]
+        ax.plot(xs, y, color=BRIDGE_COLORS[b], linewidth=1.6, alpha=0.92,
+                zorder=3,
+                label=f"{b}  SD = {sd:.3f}")
+
+    # Architectural offset curve (pooled)
+    arch_offsets = df["arch_offset"].values
+    kde_arch = gaussian_kde(arch_offsets)
+    y_arch   = kde_arch(xs)
+    ax.fill_between(xs, y_arch, color=C_ARCH, alpha=0.18, zorder=2)
+    ax.plot(xs, y_arch, color=C_ARCH, linewidth=2.2, linestyle="--", zorder=4,
+            label=f"Architectural  SD = {arch_sd:.3f}")
+
+    ax.axvline(0, color="#666", linewidth=0.8, linestyle=":",
+               alpha=0.6, zorder=0)
+    ax.set_xlabel("AUC offset from grouping mean", fontsize=11)
+    ax.set_ylabel("Probability density", fontsize=11)
+    ax.set_xlim(-x_max, x_max)
+    ax.set_yticklabels([])
+    ax.tick_params(axis="y", which="both", left=True, labelleft=False)
+    ax.grid(axis="y", alpha=0.25, linestyle="--")
+
+    # Headroom on the y-axis so the variance-ratio box does not crowd the
+    # architectural-curve peak.
+    ymin, ymax = ax.get_ylim()
+    ax.set_ylim(0, ymax * 1.10)
+
+    # Legend below the top so it clears the variance-ratio annotation.
+    ax.legend(
+        loc="upper left", bbox_to_anchor=(0.0, 0.82),
+        fontsize=9, framealpha=0.92,
+    )
+
+    txt = f"variance ratio  fold-SD / arch-SD = {ratio:.2f}"
+    ax.text(
+        0.985, 0.975, txt, transform=ax.transAxes,
+        ha="right", va="top", fontsize=10.5, family="monospace",
+        bbox=dict(boxstyle="round,pad=0.45", facecolor="white",
+                  edgecolor="#888", alpha=0.92),
+    )
+
+
+# ── Combined render ─────────────────────────────────────────────────────────
+
+def render() -> None:
+    df = collect()
+    if df.empty:
+        print("No data collected; check the source paths.")
+        return
+
+    n_cells = df.groupby(["rep", "fold"]).ngroups
+    n_bridges = df["bridge"].nunique()
+    arch_sd, fold_sd, ratio, per_bridge_sd = decompose(df)
+
+    print(f"Collected {len(df)} observations  ({n_bridges} bridges x {n_cells} cells)")
+    print(f"  across-architecture SD (within cell)  : {arch_sd:.4f}")
+    print(f"  across-fold-rep SD (within bridge)    : {fold_sd:.4f}")
+    print(f"  ratio fold-SD / arch-SD               : {ratio:.2f}x")
+    print("Per-bridge fold-rep SDs:")
+    for b in [name for name, _ in BRIDGES]:
+        print(f"  {b:<10s} SD = {per_bridge_sd[b]:.4f}")
+
+    fig, (axA, axB) = plt.subplots(
+        nrows=1, ncols=2, figsize=(16.0, 6.0),
+        gridspec_kw=dict(wspace=0.22),
+    )
+
+    draw_panel_a(axA, df, arch_sd, fold_sd, ratio, n_cells)
+    draw_panel_b(axB, df, arch_sd, fold_sd, ratio, per_bridge_sd)
+
+    # Subfigure labels
+    for ax, label in ((axA, "A"), (axB, "B")):
+        ax.text(
+            -0.07, 1.03, label, transform=ax.transAxes,
+            ha="left", va="bottom", fontsize=15, fontweight="bold",
+        )
+
+    fig.suptitle(
+        "Variance decomposition: fold-assignment noise vs L1 bridge choice",
+        fontsize=13.0, fontweight="bold", y=1.00,
+    )
+    fig.tight_layout(rect=(0, 0, 1, 0.97))
+
+    OUT.parent.mkdir(parents=True, exist_ok=True)
+    fig.savefig(OUT, dpi=180, bbox_inches="tight")
+    plt.close(fig)
+    print(f"saved {OUT}")
+
+
+if __name__ == "__main__":
+    render()

v4/figures/S3_variance_distributions.py

@@ -0,0 +1,162 @@
+"""S3 - Centered-offset distributions of architectural vs fold-rep variance.
+
+Companion to S2, presenting the same variance decomposition as two
+overlapping KDE curves on a common centered axis.
+
+For each of the 200 (fold-rep, bridge) AUC observations, compute two
+mean-centered offsets:
+
+    architectural offset = AUC - mean(AUC over the 4 bridges in that fold-rep)
+    fold-rep offset      = AUC - mean(AUC over the 50 fold-reps for that bridge)
+
+Both sets have 200 values, both are centered at 0 by construction, and the
+spread of each distribution corresponds directly to one of the two SDs in
+the variance decomposition. Plotted as KDE curves on a shared x-axis, the
+ratio of their widths is the variance ratio reported in S2.
+
+Re-run:
+    python -m v4.figures.S3_variance_distributions
+"""
+from __future__ import annotations
+
+import json
+from pathlib import Path
+
+import matplotlib
+matplotlib.use("Agg")
+import matplotlib.pyplot as plt
+import numpy as np
+import pandas as pd
+from scipy.stats import gaussian_kde
+
+from v4.figures.util.loaders import RESULTS_ROOT
+
+
+OUT = Path(__file__).parent / "output" / "S3_variance_distributions.png"
+
+BRIDGES = [
+    ("Concat",   "phase3_v4/single_bcd_concat"),
+    ("Pairwise", "phase3_v4/single_bcd_pairwise"),
+    ("Gated",    "phase3_v4/single_bcd_gated"),
+    ("Hadamard", "refuge_v2m_baseline/ensemble_single_refugelike"),
+]
+STAGE_KEY = "nt_test_auc"
+
+C_ARCH = "#222"                # dark grey for the architectural curve
+BRIDGE_COLORS = {
+    "Concat":   "#7f7f7f",     # grey  (underperformer)
+    "Pairwise": "#ff7f0e",     # orange
+    "Gated":    "#2ca02c",     # green
+    "Hadamard": "#1f77b4",     # blue (default)
+}
+
+
+def collect() -> pd.DataFrame:
+    rows = []
+    for label, rel in BRIDGES:
+        root = RESULTS_ROOT / rel
+        for s in sorted(root.glob("rep*/binary/summary.json")):
+            rep = int(s.parents[1].name.replace("rep", ""))
+            d = json.loads(s.read_text())
+            for fr in d.get("fold_results", []):
+                v = fr.get(STAGE_KEY)
+                if v is None or not np.isfinite(v):
+                    continue
+                rows.append({
+                    "bridge": label,
+                    "rep":    rep,
+                    "fold":   int(fr["fold"]),
+                    "auc":    float(v),
+                })
+    return pd.DataFrame(rows)
+
+
+def render() -> None:
+    df = collect()
+    if df.empty:
+        print("No data collected.")
+        return
+
+    # Compute centering offsets per (fold-rep, bridge) cell
+    fold_rep_mean = df.groupby(["rep", "fold"])["auc"].transform("mean")
+    bridge_mean   = df.groupby("bridge")["auc"].transform("mean")
+    df["arch_offset"] = df["auc"] - fold_rep_mean
+    df["fold_offset"] = df["auc"] - bridge_mean
+
+    # Use the same SD formula as S2 (within-group SD averaged across groups)
+    # so the two figures report identical pooled numbers.
+    cell_var   = df.groupby(["rep", "fold"])["auc"].var(ddof=1)
+    bridge_var = df.groupby("bridge")["auc"].var(ddof=1)
+    arch_sd_pooled = float(np.sqrt(cell_var.mean()))
+    fold_sd_pooled = float(np.sqrt(bridge_var.mean()))
+    ratio = fold_sd_pooled / arch_sd_pooled if arch_sd_pooled > 0 else float("inf")
+
+    # Per-bridge fold-rep SDs (50 fold-reps per bridge)
+    per_bridge_sd = {b: float(np.sqrt(v)) for b, v in bridge_var.items()}
+
+    print(f"n cells = {len(df)}")
+    print(f"architectural SD (pooled, within-fold-rep avg) = {arch_sd_pooled:.4f}")
+    print(f"fold-rep SD      (pooled, within-bridge avg)   = {fold_sd_pooled:.4f}")
+    print(f"ratio fold-SD / arch-SD                         = {ratio:.2f}")
+    print("Per-bridge fold-rep SDs:")
+    for b in [name for name, _ in BRIDGES]:
+        print(f"  {b:<10s} SD = {per_bridge_sd[b]:.4f}")
+
+    # KDE x-axis: cover the union of all offset ranges
+    all_offsets = np.concatenate([df["arch_offset"].values, df["fold_offset"].values])
+    x_max = float(np.abs(all_offsets).max()) * 1.10
+    xs = np.linspace(-x_max, x_max, 600)
+
+    fig, ax = plt.subplots(figsize=(9.4, 5.6))
+
+    # Per-bridge fold-rep offset curves (4 curves, 50 values each)
+    bridge_order = [name for name, _ in BRIDGES]
+    for b in bridge_order:
+        offs = df.loc[df["bridge"] == b, "fold_offset"].values
+        kde  = gaussian_kde(offs)
+        y    = kde(xs)
+        sd   = per_bridge_sd[b]
+        ax.plot(xs, y, color=BRIDGE_COLORS[b], linewidth=1.6, alpha=0.92,
+                zorder=3,
+                label=f"{b}  fold-rep SD = {sd:.4f}")
+
+    # Architectural offset curve (200 values pooled across cells)
+    arch_offsets = df["arch_offset"].values
+    kde_arch = gaussian_kde(arch_offsets)
+    y_arch   = kde_arch(xs)
+    ax.fill_between(xs, y_arch, color=C_ARCH, alpha=0.18, zorder=2)
+    ax.plot(xs, y_arch, color=C_ARCH, linewidth=2.2, linestyle="--", zorder=4,
+            label=f"Architectural (pooled)  SD = {arch_sd_pooled:.4f}")
+
+    # Mean line at 0 (every distribution is centered there)
+    ax.axvline(0, color="#666", linewidth=0.8, linestyle=":", alpha=0.6, zorder=0)
+
+    ax.set_xlabel("AUC offset from grouping mean", fontsize=11)
+    ax.set_ylabel("Density", fontsize=11)
+    ax.set_xlim(-x_max, x_max)
+    ax.grid(axis="y", alpha=0.25, linestyle="--")
+    ax.legend(loc="upper left", fontsize=9.5, framealpha=0.92)
+
+    # Top-right annotation with the variance ratio
+    txt = f"variance ratio  fold-SD / arch-SD = {ratio:.2f}"
+    ax.text(
+        0.985, 0.975, txt, transform=ax.transAxes,
+        ha="right", va="top", fontsize=10.5, family="monospace",
+        bbox=dict(boxstyle="round,pad=0.45", facecolor="white",
+                  edgecolor="#888", alpha=0.92),
+    )
+
+    fig.suptitle(
+        "Architectural vs fold-rep variance: centered-offset distributions",
+        fontsize=12.5, fontweight="bold", y=0.995,
+    )
+    fig.tight_layout()
+
+    OUT.parent.mkdir(parents=True, exist_ok=True)
+    fig.savefig(OUT, dpi=180, bbox_inches="tight")
+    plt.close(fig)
+    print(f"saved {OUT}")
+
+
+if __name__ == "__main__":
+    render()

v4/figures/output/F8_quadrant_fractions.csv

@@ -0,0 +1,49 @@
+class,outcome,scope,quadrant,n_eyes,mean,sd
+Glaucoma,correct,disc,ST,46,0.14268406172610618,0.08672064804334276
+Glaucoma,correct,disc,SN,46,0.1891374642326569,0.15141795670756453
+Glaucoma,correct,disc,IT,46,0.28698060971321787,0.1321960653720743
+Glaucoma,correct,disc,IN,46,0.3811978502755397,0.17407907371247724
+Glaucoma,correct,peri,ST,46,0.0801709241030986,0.08494386999472202
+Glaucoma,correct,peri,SN,46,0.15918948407117592,0.20257575474186357
+Glaucoma,correct,peri,IT,46,0.34826832191551693,0.2606073381849083
+Glaucoma,correct,peri,IN,46,0.41237125804664543,0.249789089870656
+Glaucoma,correct,full,ST,46,0.09742898919008372,0.08228642449987539
+Glaucoma,correct,full,SN,46,0.18659980165443252,0.20125297725836833
+Glaucoma,correct,full,IT,46,0.36286098988076154,0.26458782651352963
+Glaucoma,correct,full,IN,46,0.35311022712131146,0.2246580892242915
+Glaucoma,incorrect,disc,ST,34,0.252112440145696,0.15034014496616682
+Glaucoma,incorrect,disc,SN,34,0.1746002632983389,0.09578946023984732
+Glaucoma,incorrect,disc,IT,34,0.3293620129186265,0.17212955919145329
+Glaucoma,incorrect,disc,IN,34,0.24392528597147015,0.17660301429323946
+Glaucoma,incorrect,peri,ST,34,0.20385530932089996,0.17952535419921464
+Glaucoma,incorrect,peri,SN,34,0.15875330500366588,0.15449712019023593
+Glaucoma,incorrect,peri,IT,34,0.3862569142356727,0.2418765080584544
+Glaucoma,incorrect,peri,IN,34,0.25113447428742586,0.24028533916258976
+Glaucoma,incorrect,full,ST,34,0.21217464524321497,0.15540407279111246
+Glaucoma,incorrect,full,SN,34,0.16330973974559065,0.12739118311502012
+Glaucoma,incorrect,full,IT,34,0.37856896329311157,0.20473194944523931
+Glaucoma,incorrect,full,IN,34,0.24594665148198902,0.20319230952963316
+Normal,correct,disc,ST,313,0.21529517366946307,0.0928060891129116
+Normal,correct,disc,SN,313,0.1571976673739274,0.08983072836980605
+Normal,correct,disc,IT,313,0.3536251021009069,0.14392434591451472
+Normal,correct,disc,IN,313,0.27388205685844386,0.13935549411695708
+Normal,correct,peri,ST,313,0.16039412908580125,0.10491506604844639
+Normal,correct,peri,SN,313,0.11198831344232964,0.1038424179426872
+Normal,correct,peri,IT,313,0.4372451776941388,0.22439216417926178
+Normal,correct,peri,IN,313,0.29037237912573877,0.21697235549864913
+Normal,correct,full,ST,313,0.17585699926973924,0.09265567144523121
+Normal,correct,full,SN,313,0.1305376994147368,0.09449518811759064
+Normal,correct,full,IT,313,0.4112080738659084,0.19447938630719017
+Normal,correct,full,IN,313,0.28239722323230754,0.18195870133945977
+Normal,incorrect,disc,ST,27,0.12299851888544425,0.11261550366741999
+Normal,incorrect,disc,SN,27,0.2121276641099002,0.1995218721251311
+Normal,incorrect,disc,IT,27,0.26471045076221783,0.17809359884921286
+Normal,incorrect,disc,IN,27,0.40016336326290614,0.22355291760060642
+Normal,incorrect,peri,ST,27,0.07760201435962506,0.10155210979149742
+Normal,incorrect,peri,SN,27,0.1965738090304749,0.2495116802723263
+Normal,incorrect,peri,IT,27,0.2814199416369157,0.2308903646345705
+Normal,incorrect,peri,IN,27,0.4444042475568166,0.27092685369261976
+Normal,incorrect,full,ST,27,0.09632595685606479,0.13797078057713352
+Normal,incorrect,full,SN,27,0.20212570434383328,0.2336043948759492
+Normal,incorrect,full,IT,27,0.3081102746977408,0.2523555953549531
+Normal,incorrect,full,IN,27,0.3934380562908973,0.24633953116106946

v4/figures/output/S8e_clinical_importance.csv

@@ -0,0 +1,10 @@
+feature,mean_drop,std_drop,baseline_auc_mean
+Age,0.1487745098039216,0.07246596166317897,0.7117647058823529
+IOP_corr,0.0645588235294118,0.053595964337907635,0.7117647058823529
+Phakic/Pseudophakic,0.031004901960784353,0.05039528009700277,0.7117647058823529
+Pachymetry,0.011421568627451003,0.016547911692771797,0.7117647058823529
+Gender,0.006102941176470622,0.022596178307964714,0.7117647058823529
+eyeID,0.0,0.0,0.7117647058823529
+dioptre_2,-0.0010294117647058861,0.003622645200240852,0.7117647058823529
+astigmatism,-0.002156862745098008,0.008336072214271729,0.7117647058823529
+dioptre_1,-0.006593137254901939,0.011003619078899692,0.7117647058823529

v4/scripts/analysis/bridge_attention_ceiling_check.py

@@ -0,0 +1,117 @@
+"""Variance decomposition: is the high-backbone end of the bridge_attention
+sweep hitting a dataset ceiling?
+
+For each (rep, fold) cell, we have 12 hb_test_auc measurements — one per
+(bridge × backbone) condition. We decompose the variance two ways and compare
+between the LOW-backbone and HIGH-backbone halves of the gradient:
+
+    across-arch variance @ fixed (rep,fold)
+        = var across the conditions in this subset, for the same fold split
+        (small → architectures are interchangeable at this capacity)
+    across-fold variance @ fixed architecture
+        = var across the 50 fold-reps, for one condition
+        (small → the fold split doesn't matter much)
+
+If at the high-backbone end, across-fold dwarfs across-arch, the dataset's
+fold-assignment noise dominates the architectural choice — i.e. all the
+strong configurations are hitting the same ceiling.
+
+Reads summary.json files directly, no inference needed.
+"""
+from __future__ import annotations
+
+import json
+from pathlib import Path
+
+import numpy as np
+import pandas as pd
+
+SWEEP_ROOT = Path("v4/results/experiments/bridge_attention")
+
+LOW_BACKBONES  = ["mobilenet_v2", "resnet50", "efficientnet_b0"]
+HIGH_BACKBONES = ["efficientnet_v2_m", "refugelike", "refuge_efficientnet_v2_m"]
+BRIDGES = ["gated", "ortho"]
+
+
+def collect_long() -> pd.DataFrame:
+    rows = []
+    for bridge in BRIDGES:
+        for bb in LOW_BACKBONES + HIGH_BACKBONES:
+            run_dir = SWEEP_ROOT / f"{bridge}_{bb}"
+            if not run_dir.exists():
+                continue
+            for s in sorted(run_dir.glob("rep*/binary/summary.json")):
+                rep = int(s.parents[1].name.replace("rep", ""))
+                d = json.loads(s.read_text())
+                for fr in d.get("fold_results", []):
+                    v = fr.get("hb_test_auc")
+                    if v is None or not np.isfinite(v):
+                        continue
+                    rows.append({
+                        "bridge": bridge,
+                        "backbone": bb,
+                        "rep": rep,
+                        "fold": fr["fold"],
+                        "auc": float(v),
+                    })
+    return pd.DataFrame(rows)
+
+
+def decompose(df: pd.DataFrame, label: str) -> None:
+    # condition = bridge × backbone tuple
+    df = df.copy()
+    df["condition"] = df["bridge"] + "/" + df["backbone"]
+    n_cond = df["condition"].nunique()
+    n_cells = df.groupby(["rep", "fold"]).ngroups
+
+    # Across-architecture variance @ fixed (rep, fold)
+    grouped_cell = df.groupby(["rep", "fold"])["auc"]
+    cell_var = grouped_cell.var(ddof=1)         # one var per (rep,fold) cell
+    cell_std_mean = float(np.sqrt(cell_var.mean())) if not cell_var.empty else float("nan")
+
+    # Across-fold-rep variance @ fixed architecture
+    grouped_arch = df.groupby("condition")["auc"]
+    arch_var = grouped_arch.var(ddof=1)
+    arch_std_mean = float(np.sqrt(arch_var.mean())) if not arch_var.empty else float("nan")
+
+    ratio = arch_std_mean / cell_std_mean if cell_std_mean > 0 else float("inf")
+    mean_auc = float(df["auc"].mean())
+    print(f"── {label} ──  (n_conditions={n_cond}, n_cells={n_cells}, n_obs={len(df)})")
+    print(f"  mean AUC across all (cond, rep, fold) ........ {mean_auc:.4f}")
+    print(f"  across-arch SD @ fixed (rep,fold) ............ {cell_std_mean:.4f}  "
+          f"← architectural spread within the same fold")
+    print(f"  across-foldrep SD @ fixed architecture ....... {arch_std_mean:.4f}  "
+          f"← fold-assignment noise within a single architecture")
+    print(f"  ratio  arch-SD / fold-SD ..................... {ratio:>6.2f}x  "
+          f"({'fold noise dominates' if ratio > 2 else 'arch + fold comparable'})")
+    print()
+
+
+def main():
+    df = collect_long()
+    if df.empty:
+        print("No data — has the full readout finished yet?")
+        return
+
+    n_cond = df["bridge"].nunique() * df["backbone"].nunique()
+    print(f"Collected {len(df)} (cond, rep, fold) AUC observations from "
+          f"{n_cond} (bridge × backbone) conditions\n")
+
+    low  = df[df["backbone"].isin(LOW_BACKBONES)]
+    high = df[df["backbone"].isin(HIGH_BACKBONES)]
+    decompose(low,  "LOW backbones  (mobilenet_v2, resnet50, efficientnet_b0)")
+    decompose(high, "HIGH backbones (efficientnet_v2_m, refugelike, refuge_v2m)")
+
+    # Headline interpretation
+    print("──────────────────────────────────────────────────────")
+    print("Interpretation:")
+    print("  - If both subsets show high arch-SD: architectures genuinely differ.")
+    print("  - If LOW shows high arch-SD but HIGH shows low arch-SD: ceiling effect")
+    print("    at the high-backbone end — all strong configurations hit the same wall.")
+    print("  - Within each subset, ratio = fold-SD / arch-SD: when fold noise")
+    print("    dominates by >2x, the cell-to-cell variation between architectures")
+    print("    is smaller than the noise floor introduced by patient assignment.")
+
+
+if __name__ == "__main__":
+    main()

v4/scripts/analysis/bridge_attention_readout.py

@@ -0,0 +1,300 @@
+"""Per-tower gate / contribution readout + per-head AUC sanity check.
+
+For each gated_<backbone> run (and ortho_<backbone>), loads each fold's
+checkpoints and runs inference on the test set, capturing in a single pass:
+  • per-sample per-stream bridge attention (sigmoid gates for
+    GatedAdditiveBridge; ||W_i·z_i|| pre-LN projection norms for OrthoBridge)
+  • per-fold AUCs of the eye-level aux heads (img_aux, cd_aux, nt_head) —
+    sanity check that the image tower really is getting stronger as the
+    backbone improves, and that the clinical tower stays consistent
+
+Outputs:
+    v4/results/experiments/bridge_attention/_summary/gated_gates.csv
+    v4/results/experiments/bridge_attention/_summary/ortho_stream_norms.csv
+        Both CSVs include img_aux_auc, cd_aux_auc, nt_head_auc columns.
+
+Run:
+    python -m v4.scripts.analysis.bridge_attention_readout
+    python -m v4.scripts.analysis.bridge_attention_readout --bridges gated
+    python -m v4.scripts.analysis.bridge_attention_readout --reps 3   # subsample for speed
+"""
+from __future__ import annotations
+
+import argparse
+import importlib
+import json
+from pathlib import Path
+
+import numpy as np
+import pandas as pd
+import torch
+from tqdm import tqdm
+
+from v4.classes.split_manager import SplitManager
+from v4.classes.v4_hypertower import _make_loader, build_towers, load_data
+import v4.classes.v4_hypertower as orch
+
+
+SWEEP_ROOT = Path("v4/results/experiments/bridge_attention")
+OUT_DIR = SWEEP_ROOT / "_summary"
+
+BACKBONES = [
+    "mobilenet_v2",
+    "resnet50",
+    "efficientnet_b0",
+    "efficientnet_v2_m",
+    "refugelike",
+    "refuge_efficientnet_v2_m",
+]
+
+
+# ─────────────────────────────────────────────────────────────────────────────
+# Shared fold-module loader (trimmed version of F8's helper)
+# ─────────────────────────────────────────────────────────────────────────────
+
+def _load_fold_bridge(ckpt_dir: Path, cfg: dict, data, device):
+    """Load towers + nt bridge + eye-level aux heads from a single fold ckpt dir."""
+    from v4.classes.heads.classifier import ClassificationHead
+
+    towers = build_towers(cfg["towers"], data)
+    for name, tower in towers.items():
+        tower.load_state_dict(
+            torch.load(ckpt_dir / f"tower_{name}.pt", map_location="cpu")
+        )
+        tower.to(device).eval()
+
+    stage_by_name = {s["name"]: s for s in cfg["stages"]}
+    nt_cfg = stage_by_name["nt"]
+    nt_mod = importlib.import_module(nt_cfg["module"])
+    nt = getattr(nt_mod, nt_cfg["class"])(
+        [towers[n].out_dim for n in nt_cfg["inputs"]],
+        **nt_cfg.get("args", {}),
+    ).to(device)
+    nt.load_state_dict(torch.load(ckpt_dir / "stage_nt.pt", map_location="cpu"))
+    nt.eval()
+
+    nc = cfg["num_classes"]
+    img_aux = ClassificationHead(towers["img"].out_dim, nc).to(device)
+    cd_aux = ClassificationHead(towers["cd"].out_dim, nc).to(device)
+    nt_head = ClassificationHead(nt.out_dim, nc).to(device)
+    img_aux.load_state_dict(torch.load(ckpt_dir / "stage_img_aux.pt", map_location="cpu"))
+    cd_aux.load_state_dict(torch.load(ckpt_dir / "stage_cd_aux.pt", map_location="cpu"))
+    nt_head.load_state_dict(torch.load(ckpt_dir / "stage_nt_head.pt", map_location="cpu"))
+    img_aux.eval(); cd_aux.eval(); nt_head.eval()
+    aux = {"img_aux": img_aux, "cd_aux": cd_aux, "nt_head": nt_head}
+    return towers, nt, nt_cfg, aux
+
+
+def _splits_from_cfg(cfg: dict, data):
+    label_filter = cfg.get("label_filter", None)
+    df_mode = data.df.copy()
+    if label_filter is not None:
+        df_mode = df_mode[df_mode[data.label_col].isin(label_filter)].reset_index(drop=True)
+    identity_cols = getattr(data, "identity_cols", [])
+    identity_level = cfg.get("split_identity_level", 1)
+    group_col = (
+        identity_cols[identity_level - 1]
+        if identity_level and identity_cols
+        else None
+    )
+    return SplitManager(group_col=group_col).build_plans(
+        df_mode,
+        label_col=data.label_col,
+        n_splits=cfg.get("folds", 5),
+        seed=cfg.get("fold_seed", 100),
+    ), label_filter
+
+
+# ─────────────────────────────────────────────────────────────────────────────
+# Unified inference: capture bridge attention + per-head logits in one pass
+# ─────────────────────────────────────────────────────────────────────────────
+
+def _install_attention_hooks(nt, bridge_kind: str):
+    """Register the right hook(s) for the bridge kind. Returns (handles, finalize)
+    where finalize() reads back the captured per-sample (N, n_streams) array."""
+    if bridge_kind == "gated":
+        captured: list[torch.Tensor] = []
+        def hook(_module, _input, output):
+            captured.append(output.detach().cpu())
+        handles = [nt.gate.register_forward_hook(hook)]
+        def finalize():
+            return (
+                torch.cat(captured, dim=0).numpy() if captured else np.empty((0, 0))
+            )
+        return handles, finalize
+
+    if bridge_kind == "ortho":
+        # Pre-LN projection norm ||W_i z_i||_2 per stream. Post-LN norm is
+        # √fusion_dim by construction, so we hook the linear projection itself.
+        per_stream: list[list[torch.Tensor]] = [[] for _ in range(len(nt.inner.W))]
+        handles = []
+        for i, w in enumerate(nt.inner.W):
+            def make_hook(idx):
+                def hook(_module, _input, output):
+                    per_stream[idx].append(output.detach().norm(dim=-1).cpu())
+                return hook
+            handles.append(w.register_forward_hook(make_hook(i)))
+        def finalize():
+            cols = [
+                torch.cat(c, dim=0).numpy() if c else np.array([])
+                for c in per_stream
+            ]
+            if not all(s.size for s in cols):
+                return np.empty((0, 0))
+            return np.stack(cols, axis=1)
+        return handles, finalize
+
+    raise ValueError(f"unknown bridge_kind {bridge_kind!r}")
+
+
+def extract_one_fold(
+    bridge_kind: str,
+    towers, nt, aux: dict,
+    data, split_obj, label_filter, device,
+):
+    """Single inference pass that returns:
+        attention : ndarray (N, n_streams) — bridge-specific attention signal
+        head_aucs : dict[str, float] — AUC of softmax[:,1] for each aux head
+        n_samples : int
+    """
+    from sklearn.metrics import roc_auc_score
+    import torch.nn.functional as F
+
+    if split_obj.test is None:
+        return np.empty((0, 0)), {}, 0
+
+    shell = data.build_shells(
+        split_obj.test, level="patient", label_filter=label_filter
+    )
+    loader = _make_loader(shell, towers, batch_size=8, shuffle=False)
+
+    handles, finalize = _install_attention_hooks(nt, bridge_kind)
+    img_logits, cd_logits, nt_logits, ys = [], [], [], []
+
+    try:
+        with torch.no_grad():
+            for batch in loader:
+                y = batch["label"].detach().cpu().numpy()
+                for side in ("a", "b"):
+                    z_img = towers["img"](batch["img"][side].to(device))
+                    z_cd = towers["cd"](batch["cd"][side].to(device))
+                    img_logits.append(aux["img_aux"](z_img).cpu())
+                    cd_logits.append(aux["cd_aux"](z_cd).cpu())
+                    z_fused = nt([z_img, z_cd])  # attention hooks capture here
+                    nt_logits.append(aux["nt_head"](z_fused).cpu())
+                    ys.append(y)
+        attention = finalize()
+    finally:
+        for h in handles:
+            h.remove()
+
+    if not ys:
+        return attention, {}, 0
+
+    y_all = np.concatenate(ys)
+    head_aucs: dict[str, float] = {}
+    for name, buf in [
+        ("img_aux", img_logits),
+        ("cd_aux",  cd_logits),
+        ("nt_head", nt_logits),
+    ]:
+        logits = torch.cat(buf, dim=0).numpy()
+        probs = (np.exp(logits - logits.max(axis=1, keepdims=True))
+                 / np.exp(logits - logits.max(axis=1, keepdims=True))
+                   .sum(axis=1, keepdims=True))
+        try:
+            head_aucs[name] = float(roc_auc_score(y_all, probs[:, 1]))
+        except Exception:
+            head_aucs[name] = float("nan")
+
+    return attention, head_aucs, int(attention.shape[0])
+
+
+# ─────────────────────────────────────────────────────────────────────────────
+# Driver
+# ─────────────────────────────────────────────────────────────────────────────
+
+def run_for_bridge(bridge_kind: str, max_reps: int | None, device) -> pd.DataFrame:
+    rows: list[dict] = []
+    for backbone in BACKBONES:
+        run_dir = SWEEP_ROOT / f"{bridge_kind}_{backbone}"
+        if not run_dir.exists():
+            print(f"  [{bridge_kind}/{backbone}] (missing)")
+            continue
+        rep_dirs = sorted(run_dir.glob("rep*"))
+        if max_reps is not None:
+            rep_dirs = rep_dirs[:max_reps]
+        for rep_dir in tqdm(rep_dirs, desc=f"{bridge_kind}/{backbone}", unit="rep"):
+            summary_path = rep_dir / "binary" / "summary.json"
+            if not summary_path.exists():
+                continue
+            cfg = json.loads(summary_path.read_text())["config"]
+            orch.cfg_ref = cfg
+            data = load_data(cfg)
+            splits, label_filter = _splits_from_cfg(cfg, data)
+
+            try:
+                rep_idx = int(rep_dir.name.replace("rep", ""))
+            except ValueError:
+                continue
+
+            for fold_idx in range(cfg.get("folds", 5)):
+                ckpt_dir = rep_dir / "binary" / "checkpoints" / f"fold{fold_idx}"
+                if not ckpt_dir.exists():
+                    continue
+                towers, nt, _, aux = _load_fold_bridge(ckpt_dir, cfg, data, device)
+                arr, head_aucs, _ = extract_one_fold(
+                    bridge_kind, towers, nt, aux, data,
+                    splits[fold_idx], label_filter, device,
+                )
+
+                if arr.size:
+                    means = arr.mean(axis=0)
+                    rows.append({
+                        "bridge": bridge_kind,
+                        "backbone": backbone,
+                        "rep": rep_idx,
+                        "fold": fold_idx,
+                        "n_samples": arr.shape[0],
+                        "img_value": float(means[0]),
+                        "cd_value": float(means[1]),
+                        "img_share": float(means[0] / (means.sum() + 1e-8)),
+                        "img_aux_auc": head_aucs.get("img_aux", float("nan")),
+                        "cd_aux_auc":  head_aucs.get("cd_aux",  float("nan")),
+                        "nt_head_auc": head_aucs.get("nt_head", float("nan")),
+                    })
+
+                del towers, nt, aux
+                if torch.cuda.is_available():
+                    torch.cuda.empty_cache()
+    return pd.DataFrame(rows)
+
+
+def main():
+    ap = argparse.ArgumentParser(description=__doc__)
+    ap.add_argument(
+        "--bridges", default="gated,ortho",
+        help="Comma-separated bridge kinds to process (default: gated,ortho)",
+    )
+    ap.add_argument(
+        "--reps", type=int, default=None,
+        help="Cap reps per backbone for a quick first pass (default: all)",
+    )
+    args = ap.parse_args()
+    device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
+    print(f"device: {device}")
+
+    OUT_DIR.mkdir(parents=True, exist_ok=True)
+    for bridge in args.bridges.split(","):
+        bridge = bridge.strip()
+        if not bridge:
+            continue
+        df = run_for_bridge(bridge, args.reps, device)
+        suffix = "gates" if bridge == "gated" else "stream_norms"
+        out = OUT_DIR / f"{bridge}_{suffix}.csv"
+        df.to_csv(out, index=False)
+        print(f"saved {out}  ({len(df)} rows)")
+
+
+if __name__ == "__main__":
+    main()

v4/scripts/experiments/backbone_replication/anonymous_cv.json

@@ -0,0 +1,10 @@
+[
+  {
+    "_note": "F2 block 2 — Anonymous CV variant of the refugelike R50 image-only single-eye baseline. split_identity_level=0 disables patient-level fold grouping (v4_hypertower.py:254-256); fold assignment becomes patient-anonymous, allowing the two eyes of one patient to fall on opposite sides of the train/test split. Mirrors v3 phase 2 imageonly_resnet50_leaky. Same backbone, same architecture, same seed/fold_seed as the F2 block-3 baseline (refugelike img-only single-eye); only the grouping rule changes. The gap baseline→anonymous quantifies the patient-anonymous CV inflation.",
+    "run_name": "experiments/backbone_replication/anonymous_cv_refugelike",
+    "reps": 10,
+    "overrides": {
+      "split_identity_level": 0
+    }
+  }
+]

v4/scripts/experiments/backbone_replication/anonymous_cv_ensemble_single.json

@@ -0,0 +1,10 @@
+[
+  {
+    "_note": "Anonymous CV variant of the single-eye img+cd L1 fusion configuration at the refugelike R50 backbone (the 'classic hypertower' eye-level fusion mode without L2 bilateral aggregation). split_identity_level=0 disables patient-level fold grouping; fold assignment becomes patient-anonymous, allowing the two eyes of one patient to fall on opposite sides of the train/test split. Mirrors the image-only anonymous_cv_refugelike run (F2 block 2) but with the clinical tower fused in at the L1 stage, so the patient-anonymous CV inflation can be quantified directly against the single-eye img+cd headline number (ensemble_single_refugelike rep-mean test AUC 0.874 at split_identity_level=1). Same backbone, towers, bridge, training schedule, and seeds as the single-eye headline; only the fold-grouping rule changes. Bilateral L2 is not included because patient-level aggregation is mechanically incompatible with patient-anonymous fold assignment.",
+    "run_name": "experiments/backbone_replication/anonymous_cv_ensemble_single_refugelike",
+    "reps": 10,
+    "overrides": {
+      "split_identity_level": 0
+    }
+  }
+]

v4/scripts/experiments/backbone_replication/basic_backbones.json

@@ -0,0 +1,46 @@
+[
+  {
+    "_note": "F2 block 1 — basic backbones, ImageNet pretrained, image-only, single-eye, patient-grouped 5-fold CV. VGG16. Replicates v3 phase 1 imageonly_vgg16 in the v4 pipeline.",
+    "run_name": "experiments/backbone_replication/basic_vgg16",
+    "reps": 10,
+    "tower_overrides": {
+      "img": { "args": { "backbone": "vgg16", "freeze_ratio": 0.0 } }
+    }
+  },
+
+  {
+    "_note": "F2 block 1 — MobileNetV2 (ImageNet, img-only, single-eye).",
+    "run_name": "experiments/backbone_replication/basic_mobilenet_v2",
+    "reps": 10,
+    "tower_overrides": {
+      "img": { "args": { "backbone": "mobilenet_v2", "freeze_ratio": 0.0 } }
+    }
+  },
+
+  {
+    "_note": "F2 block 1 — DenseNet121 (ImageNet, img-only, single-eye).",
+    "run_name": "experiments/backbone_replication/basic_densenet121",
+    "reps": 10,
+    "tower_overrides": {
+      "img": { "args": { "backbone": "densenet121", "freeze_ratio": 0.0 } }
+    }
+  },
+
+  {
+    "_note": "F2 block 1 — InceptionV3 (ImageNet, img-only, single-eye). NB: Inception expects 299x299 input — backbone_transform_config auto-overrides crop_size to 299 for inception_v3.",
+    "run_name": "experiments/backbone_replication/basic_inception_v3",
+    "reps": 10,
+    "tower_overrides": {
+      "img": { "args": { "backbone": "inception_v3", "freeze_ratio": 0.0 } }
+    }
+  },
+
+  {
+    "_note": "F2 block 1 — ResNet50 ImageNet-pretrained (the unfrozen ImageNet R50, not refugelike). Anchor for the basic-backbone comparison.",
+    "run_name": "experiments/backbone_replication/basic_resnet50",
+    "reps": 10,
+    "tower_overrides": {
+      "img": { "args": { "backbone": "resnet50", "freeze_ratio": 0.0 } }
+    }
+  }
+]

v4/scripts/experiments/backbone_replication/disc_crop.json

@@ -0,0 +1,39 @@
+[
+  {
+    "_note": "F2 block 2 — GT disc-contour crop. R50 refugelike, image-only, single-eye, patient-grouped 5-fold CV. Each input image is cropped to a square bbox centred on the GT disc contour with margin=2.5 (matching v3 phase 2 imageonly_resnet50_gtcrop_2.5). The crop happens in original image coords before the standard 256-resize + 224-center-crop transform pipeline runs. Eyes with no contour file fall back to the un-cropped full image.",
+    "run_name": "experiments/backbone_replication/gtcrop_refugelike",
+    "reps": 10,
+    "tower_overrides": {
+      "img": {
+        "args": {
+          "backbone":     "refugelike",
+          "freeze_ratio": 0.0,
+          "crop_source":  "gt",
+          "crop_kwargs":  { "margin": 2.5, "expert": 1 }
+        }
+      }
+    }
+  },
+
+  {
+    "_note": "F2 block 2 — U-Net disc-mask crop. R50 refugelike, image-only, single-eye, patient-grouped 5-fold CV. Each input image is cropped to a square bbox centred on the U-Net-predicted disc mask with margin=2.5 (matching v3 phase 2 imageonly_resnet50_unetcrop_2.5). U-Net is loaded from the base REFUGE checkpoint and NOT fine-tuned per fold (finetune_epochs=0) to keep this an apples-to-apples preprocessing-only ablation. Eyes where U-Net predicts no disc fall back to the un-cropped full image.",
+    "run_name": "experiments/backbone_replication/unetcrop_refugelike",
+    "reps": 10,
+    "tower_overrides": {
+      "img": {
+        "args": {
+          "backbone":     "refugelike",
+          "freeze_ratio": 0.0,
+          "crop_source":  "unet",
+          "crop_kwargs":  {
+            "margin":          2.5,
+            "weights_path":    "models/v2/refuge/segmentation/per_image/best.pt",
+            "unet_size":       512,
+            "threshold":       0.5,
+            "finetune_epochs": 0
+          }
+        }
+      }
+    }
+  }
+]

v4/scripts/experiments/explainability/ensemble_refugelike_ckpt.json

@@ -0,0 +1,10 @@
+[
+  {
+    "_note": "10-rep checkpointed run of the production bilateral img+cd ensemble at the refugelike R50 backbone (headline configuration). Per-fold tower and stage_models state_dicts saved under each rep's checkpoints/foldN/ directory. Used for F8 explainability: reconstructing per-tower predictions at the nt (eye) and hb (patient) levels so we can compare img-tower-only, cd-tower-only, eye-fusion, and patient-fusion outputs on the headline backbone.",
+    "run_name": "experiments/explainability/ensemble_refugelike_ckpt",
+    "reps": 10,
+    "overrides": {
+      "save_checkpoints": true
+    }
+  }
+]

v4/scripts/experiments/freeze_sweep/refugelike_freeze_sweep.json

@@ -1,8 +1,8 @@
 [
   {
-    "_note": "refugelike (resnet50 + REFUGE fundus pretraining), freeze stem only (1/5 blocks). Tests whether even minimal anchoring helps stability.",
+    "_note": "refugelike (resnet50 + REFUGE fundus pretraining), freeze stem only (1/5 blocks). Tests whether even minimal anchoring helps stability. Bumped to 10 reps for the methods ablation table.",
     "run_name": "experiments/freeze_sweep/refugelike_freeze20",
-    "reps": 3,
+    "reps": 10,
     "tower_overrides": {
       "img": { "args": { "backbone": "refugelike", "freeze_ratio": 0.2 } }
     }
@@ -18,11 +18,20 @@
   },
 
   {
-    "_note": "Freeze stem + layer1 + layer2 (3/5 blocks). Only the deep semantic layers adapt — most aggressive practical setting before model loses capacity.",
+    "_note": "Freeze stem + layer1 + layer2 (3/5 blocks). Only the deep semantic layers adapt — most aggressive practical setting before model loses capacity. Bumped to 10 reps for the methods ablation table.",
     "run_name": "experiments/freeze_sweep/refugelike_freeze60",
-    "reps": 3,
+    "reps": 10,
     "tower_overrides": {
       "img": { "args": { "backbone": "refugelike", "freeze_ratio": 0.6 } }
     }
+  },
+
+  {
+    "_note": "Fully frozen backbone (freeze_ratio=1.0) — image features are entirely fixed at the REFUGE-pretrained state, only the L1 bridge and downstream heads adapt. Provides the extreme end of the freeze-ratio sweep for the methods ablation table.",
+    "run_name": "experiments/freeze_sweep/refugelike_freeze100",
+    "reps": 10,
+    "tower_overrides": {
+      "img": { "args": { "backbone": "refugelike", "freeze_ratio": 1.0 } }
+    }
   }
 ]

v4/scripts/experiments/reg_head/baseline_reg_nt50_floaty.json

@@ -0,0 +1,33 @@
+[
+  {
+    "_note": "Re-run of the headline VF_MD regression configuration (baseline_reg_nt50) after the PredictionStore y_true dtype fix. The previous run stored y_true as int64, silently rounding VF_MD floats to integers (introducing ~0.3 dB of rounding noise into MAE and the regression residuals). With the fix applied, regression targets are stored as float64. Matched seeds and fold_seeds to the original baseline_reg_nt50 so fold splits are identical and rep-paired comparison is meaningful. All other settings (nt epochs = 50, all four heads as RegressionHead targeting vf_md, label_filter [0,1,2] to retain Suspect, refugelike R50 backbone, bilateral L1+L2 fusion) are unchanged.",
+    "run_name": "experiments/reg_head/baseline_reg_nt50_floaty",
+    "reps": 10,
+    "overrides": {
+      "label_filter": [0, 1, 2]
+    },
+    "stage_overrides": {
+      "nt": { "epochs": 50 },
+      "img_aux": {
+        "module": "v4.classes.heads.regression",
+        "class":  "RegressionHead",
+        "args":   { "dropout": 0.3, "target_key": "vf_md", "loss": "mse" }
+      },
+      "cd_aux": {
+        "module": "v4.classes.heads.regression",
+        "class":  "RegressionHead",
+        "args":   { "dropout": 0.3, "target_key": "vf_md", "loss": "mse" }
+      },
+      "nt_head": {
+        "module": "v4.classes.heads.regression",
+        "class":  "RegressionHead",
+        "args":   { "dropout": 0.3, "target_key": "vf_md", "loss": "mse" }
+      },
+      "hb_head": {
+        "module": "v4.classes.heads.regression",
+        "class":  "RegressionHead",
+        "args":   { "dropout": 0.3, "target_key": "vf_md", "loss": "mse" }
+      }
+    }
+  }
+]

v4/scripts/experiments/sensitivity/axial_length_include.json

@@ -0,0 +1,16 @@
+[
+  {
+    "_note": "Sensitivity: refugelike ensemble (img + cd, bilateral) — apples-to-apples replication of tri_v1/baseline_ensemble (mean hb_test_auc ≈ 0.896) but with Axial_Length INCLUDED in the clinical feature set instead of excluded. Tests whether the pilot-era finding that Axial_Length negatively contributed to fused AUC survives the v4 architecture. Same seed/fold_seed start (1234/100) as baseline_ensemble so (rep, fold) pairs are matched for paired statistics. save_checkpoints + save_predictions enabled so the run can drive a downstream permutation-importance feature ablation if needed.",
+    "run_name": "experiments/sensitivity/refugelike_ensemble_with_axial_length",
+    "reps": 10,
+    "overrides": {
+      "save_checkpoints": true,
+      "save_predictions": true,
+      "data": {
+        "args": {
+          "exclude_cols": []
+        }
+      }
+    }
+  }
+]

v4/scripts/experiments/sensitivity/probe_v2m_480_amp.py

@@ -0,0 +1,107 @@
+"""Memory probe: EfficientNetV2-M at 480x480, bilateral forward+backward, AMP bf16.
+
+Goal: confirm bs=8 fits in 16 GB on the available GPU before committing to the
+full sensitivity experiment.
+
+Mimics the bilateral training step (image tower run twice on OD + OS with shared
+weights, plus a small downstream head + CE loss + Adam step). The clinical tower
+and L1 bridge are omitted; their memory footprint is negligible against V2-M
+activations. Synthetic inputs of the correct shape — no v4 dataset needed.
+
+Run: python v4/scripts/experiments/sensitivity/probe_v2m_480_amp.py
+Expected output: GPU name, peak memory at each phase, fit/OOM verdict.
+"""
+from __future__ import annotations
+
+import sys
+import torch
+from torch import nn
+from torchvision.models import efficientnet_v2_m
+
+
+BATCH = 8
+RES = 480
+DTYPE = torch.bfloat16
+
+
+def fmt_gb(bytes_):
+    return f"{bytes_ / 1024**3:.2f} GB"
+
+
+def main():
+    if not torch.cuda.is_available():
+        print("No CUDA/ROCm device available; probe requires a GPU.", file=sys.stderr)
+        sys.exit(2)
+
+    device = torch.device("cuda")
+    gpu_name = torch.cuda.get_device_name(0)
+    gpu_total = torch.cuda.get_device_properties(0).total_memory
+    print(f"GPU: {gpu_name}   total VRAM: {fmt_gb(gpu_total)}")
+    print(f"Config: V2-M, bs={BATCH}, res={RES}, bilateral 2x forward, AMP={DTYPE}")
+    print("-" * 70)
+
+    torch.cuda.empty_cache()
+    torch.cuda.reset_peak_memory_stats()
+
+    backbone = efficientnet_v2_m(weights=None).to(device)
+    feat_dim = backbone.classifier[1].in_features
+    backbone.classifier = nn.Identity()
+    head = nn.Sequential(
+        nn.LayerNorm(feat_dim),
+        nn.Linear(feat_dim, 256),
+        nn.GELU(),
+        nn.Linear(256, 2),
+    ).to(device)
+    opt = torch.optim.Adam(
+        list(backbone.parameters()) + list(head.parameters()),
+        lr=1e-4,
+    )
+
+    print(f"After model + optimizer load: allocated={fmt_gb(torch.cuda.memory_allocated())}  "
+          f"peak={fmt_gb(torch.cuda.max_memory_allocated())}")
+
+    x_od = torch.randn(BATCH, 3, RES, RES, device=device)
+    x_os = torch.randn(BATCH, 3, RES, RES, device=device)
+    y = torch.randint(0, 2, (BATCH,), device=device)
+
+    print(f"After synthetic inputs:        allocated={fmt_gb(torch.cuda.memory_allocated())}  "
+          f"peak={fmt_gb(torch.cuda.max_memory_allocated())}")
+
+    try:
+        opt.zero_grad(set_to_none=True)
+        with torch.autocast(device_type="cuda", dtype=DTYPE):
+            z_od = backbone(x_od)
+            z_os = backbone(x_os)
+            z = z_od + z_os
+            logits = head(z)
+            loss = nn.functional.cross_entropy(logits, y)
+
+        print(f"After forward:                 allocated={fmt_gb(torch.cuda.memory_allocated())}  "
+              f"peak={fmt_gb(torch.cuda.max_memory_allocated())}")
+
+        loss.backward()
+        print(f"After backward:                allocated={fmt_gb(torch.cuda.memory_allocated())}  "
+              f"peak={fmt_gb(torch.cuda.max_memory_allocated())}")
+
+        opt.step()
+        print(f"After optimizer step:          allocated={fmt_gb(torch.cuda.memory_allocated())}  "
+              f"peak={fmt_gb(torch.cuda.max_memory_allocated())}")
+
+        torch.cuda.synchronize()
+        peak = torch.cuda.max_memory_allocated()
+        headroom = gpu_total - peak
+        print("-" * 70)
+        print(f"VERDICT: FIT  | peak={fmt_gb(peak)} of {fmt_gb(gpu_total)}  "
+              f"headroom={fmt_gb(headroom)} ({100 * headroom / gpu_total:.1f}%)")
+        print(f"Loss value: {loss.item():.4f}")
+
+    except torch.cuda.OutOfMemoryError as e:
+        peak = torch.cuda.max_memory_allocated()
+        print("-" * 70)
+        print(f"VERDICT: OOM  | peak before OOM={fmt_gb(peak)} of {fmt_gb(gpu_total)}")
+        print(f"OOM details: {e}")
+        sys.exit(1)
+
+
+if __name__ == "__main__":
+    main()

v4/scripts/experiments/sensitivity/v2m_at_480_amp.json

@@ -0,0 +1,24 @@
+[
+  {
+    "_note": "Sensitivity: refuge V2-M ensemble (img + cd, bilateral, ortho-w0.1 inner-Hadamard not applied here — matches the plain V2-M ensemble baseline at 224 from efficientnet/refuge_efficientnetv2_m which gave 0.9132 ± 0.019). This run feeds EfficientNetV2-M at its NATIVE 480x480 input resolution instead of the pipeline default 224. Activation memory roughly 4.6x; bf16 autocast keeps bs=8 fit in 16 GB (probe peak 9.07 GB on 7800 XT). Matched seed/fold_seed (1234/100) inherited from ensemble_fused.json so reps 1-10 here pair with reps 1-10 of the 224 baseline for paired statistics. 10 reps queued — kill early if wall-clock proves prohibitive. save_checkpoints + save_predictions enabled for downstream analysis if the result is promising.",
+    "run_name": "experiments/sensitivity/v2m_at_480_amp",
+    "reps": 10,
+    "overrides": {
+      "save_checkpoints": true,
+      "save_predictions": true,
+      "training": {
+        "amp": true,
+        "amp_dtype": "bfloat16"
+      }
+    },
+    "tower_overrides": {
+      "img": {
+        "args": {
+          "backbone": "refuge_efficientnet_v2_m",
+          "freeze_ratio": 0.0,
+          "crop_size": 480
+        }
+      }
+    }
+  }
+]