Add learned building proposal filtering

backend/tests/test_building_proposal_filter.py

@@ -0,0 +1,26 @@
+from __future__ import annotations
+
+import importlib.util
+from pathlib import Path
+
+
+SCRIPT = Path(__file__).parents[2] / "scripts" / "train_building_proposal_filter.py"
+SPEC = importlib.util.spec_from_file_location("building_proposal_filter", SCRIPT)
+assert SPEC and SPEC.loader
+MODULE = importlib.util.module_from_spec(SPEC)
+SPEC.loader.exec_module(MODULE)
+
+
+def test_evenly_limited_is_deterministic() -> None:
+    assert MODULE.evenly_limited(list(range(10)), 3) == [0, 3, 6]
+
+
+def test_validation_threshold_is_selected_without_test_data() -> None:
+    threshold, metrics = MODULE.choose_threshold([0.9, 0.8, 0.2, 0.1], [1, 1, 0, 0])
+    assert 0.2 < threshold <= 0.8
+    assert metrics["f1"] == 1.0
+
+
+def test_negative_match_iou() -> None:
+    assert MODULE.iou((0, 0, 10, 10), (0, 0, 10, 10)) == 1.0
+    assert MODULE.iou((0, 0, 10, 10), (20, 20, 30, 30)) == 0.0