Support dense full-AOI building evaluation

backend/tests/test_belgium_training_loop.py

@@ -31,6 +31,8 @@ def test_training_command_is_cuda_deterministic_and_bound_to_frozen_inputs(tmp_p
     assert "deterministic=True" in command
     assert "seed=42" in command
     assert "epochs=160" in command
+    assert "max_det=1000" in command
+    assert "imgsz=640" in command
     assert f"data={tmp_path / 'dataset.yaml'}" in command
 
 

docs/BELGIUM_BUILDING_TRAINING_LOOP.md

@@ -35,6 +35,7 @@ data. A new iteration adds independent training AOIs instead.
 | Temporal truth | Unknown per-pixel dates remain unknown; acquisition dates may not masquerade as observation dates |
 | Threshold selection | Calibration set only; maximise the worst regional F1 before aggregate F1 |
 | Test aggregate | F1 at least 0.55 at the frozen footprint/detection match IoU 0.25 contract |
+| Dense-tile capacity | Retain up to 1000 detections per tile; the library default of 300 is below observed Belgian urban label density |
 | Regional test | Every region: F1 at least 0.45, precision at least 0.50 and recall at least 0.40 |
 | Pure background | Zero detections on every pure-empty tile at the selected threshold |
 | Production | Exact candidate checksum and fail-closed promotion report required |

scripts/evaluate_belgium_building_candidate.py

@@ -82,6 +82,12 @@ def main() -> int:
     parser.add_argument("--split", default="val")
     parser.add_argument("--augment", action="store_true", help="Enable deterministic YOLO test-time augmentation.")
     parser.add_argument("--imgsz", type=int, default=640)
+    parser.add_argument(
+        "--max-det",
+        type=int,
+        default=1000,
+        help="Maximum detections retained per tile; dense Belgian urban tiles exceed YOLO's default 300.",
+    )
     args = parser.parse_args()
 
     from ultralytics import YOLO
@@ -106,6 +112,7 @@ def main() -> int:
         device=args.device,
         augment=args.augment,
         imgsz=args.imgsz,
+        max_det=args.max_det,
         verbose=False,
     )
     observations: list[dict[str, Any]] = []
@@ -155,6 +162,7 @@ def main() -> int:
         "match_iou": args.match_iou,
         "test_time_augmentation": args.augment,
         "inference_imgsz": args.imgsz,
+        "max_detections_per_tile": args.max_det,
         "tile_count": len(tiles),
         "sweeps": sweeps,
     }

scripts/run_belgium_building_training_loop.py

@@ -40,6 +40,8 @@ def training_command(
     seed: int,
     batch: int,
     workers: int,
+    max_det: int = 1000,
+    imgsz: int = 640,
 ) -> list[str]:
     return [
         yolo,
@@ -47,13 +49,14 @@ def training_command(
         f"model={model}",
         f"data={data}",
         f"epochs={epochs}",
-        "imgsz=640",
+        f"imgsz={imgsz}",
         f"batch={batch}",
         "device=0",
         f"workers={workers}",
         "patience=35",
         "cache=disk",
         "close_mosaic=20",
+        f"max_det={max_det}",
         f"seed={seed}",
         "deterministic=True",
         f"project={project}",
@@ -88,6 +91,8 @@ def main() -> int:
     parser.add_argument("--epochs", type=int, default=160)
     parser.add_argument("--batch", type=int, default=2)
     parser.add_argument("--workers", type=int, default=4)
+    parser.add_argument("--max-det", type=int, default=1000)
+    parser.add_argument("--imgsz", type=int, default=640)
     parser.add_argument("--seed", type=int, default=20260731)
     parser.add_argument("--yolo", default="yolo")
     parser.add_argument("--dry-run", action="store_true")
@@ -133,6 +138,8 @@ def main() -> int:
             seed=args.seed + index,
             batch=args.batch,
             workers=args.workers,
+            max_det=args.max_det,
+            imgsz=args.imgsz,
         )
         if args.dry_run:
             print(json.dumps({"training_command": command}, indent=2))
@@ -166,6 +173,10 @@ def main() -> int:
                     str(report),
                     "--device",
                     "cuda:0",
+                    "--max-det",
+                    str(args.max_det),
+                    "--imgsz",
+                    str(args.imgsz),
                 ],
                 iteration_dir / f"{role}.log",
             )