Release verified V2.5 native corpus with common grouped splits

README.md

@@ -39,3 +39,12 @@ The split receipt describes the algorithm and counts; the exclusions audit recor
 Source datasets: fireviewer/fire-smoke-detection-corpus-v2 at c1336415e1f9e7f67f332a6ec212345fdf3ffdb2 and fireviewer/fire_and_smoke_detection_very_hard_negative at 04ed0590954245b524dd265a6da63462b2e50f62. Mixed source-specific licences apply; this release does not grant new image rights. Consult provenance, per-image source references and the original sources.
 
 All published Parquet files were downloaded again, reloaded, and checked against native image hashes, final objects and split membership before public release.
+
+## Materialization dependencies
+
+Install requirements.txt in a remote Python environment, then run prepare_coco.py against an immutable revision. The materializer uses eight parallel downloads and verifies every native image before creating COCO folders.
+
+    python -m pip install -r requirements.txt
+    python prepare_coco.py --revision <COMMIT_SHA> --output /content/v25
+
+Native negatives retained: 12,653. Very difficult negatives retained: 195 (153 train, 21 validation, 21 test). The final corpus contains 50,591 boxes. See audit/release-verification.json and audit/metadata-verification.json for verification scope and revision identities.

audit/release-verification.json

@@ -0,0 +1,21 @@
+{
+  "ready": true,
+  "verified_content_revision": "f3fefb24efa25b2a9263a3375be6b7da2d3e5ee6",
+  "verified_manifest_revision": "e7b5799771cbd7f4084dbc4d304f401907ff9c77",
+  "images": 38965,
+  "objects": 50591,
+  "splits": {
+    "test": 3689,
+    "train": 31657,
+    "validation": 3619
+  },
+  "parquet_files": 264,
+  "all_published_shards_fully_read_back": true,
+  "all_native_image_hashes_verified": true,
+  "metadata_audit_revision": "f3fefb24efa25b2a9263a3375be6b7da2d3e5ee6",
+  "no_group_cross_split": true,
+  "all_coco_objects_match_case_manifest": true,
+  "native_negatives": 12653,
+  "very_hard_negatives": 195,
+  "released_at": 1791016764.6580043
+}