docs: explain repaired dual-direction image closure

README.md

@@ -1,12 +1,131 @@
-# Ego-Exo4D Relation Train Mini — private repack
+---
+pretty_name: V2-SAM EgoExo FullTrain image closure
+language:
+- en
+task_categories:
+- image-segmentation
+tags:
+- ego-exo4d
+- ego2exo
+- exo2ego
+- research-artifact
+license: other
+---
 
-Private research artifact assembled from the two official FullTrain JSON
-reference closures. It contains only the 249,642 JPEG files referenced by
-Ego2Exo_FullTrain.json or Exo2Ego_FullTrain.json.
+# V2-SAM Ego2Exo/Exo2Ego FullTrain image closure
 
-Each file under `data/` is an independently readable standard tar archive.
-Extract all shards into the same destination directory.
+Research repack for the V2-SAM Ego2Exo and Exo2Ego training
+pipelines. It contains the two FullTrain annotations and exactly the JPEG
+union referenced by them.
 
-Provenance hashes and closure evidence are recorded in `MANIFEST.json` and
-`provenance/`. Do not change repository visibility without confirming the
-underlying dataset redistribution terms.
+This card documents packaging integrity; it does not grant additional rights
+to the source data. Users remain responsible for complying with the
+underlying Ego-Exo4D terms and any redistribution requirements.
+
+## Why this repack exists
+
+The earlier local `Ego-Exo4D-Relation-Train-Mini` extraction was not a proven
+closure of both training directions. Auditing the union of the two FullTrain
+JSON files found 6,431 referenced paths missing before repair. Training with
+that snapshot could fail late, silently omit samples in ad-hoc loaders, or
+make Ego2Exo and Exo2Ego experiments use different image coverage.
+
+This repack fixes the data artifact rather than changing annotations:
+
+- both official FullTrain JSONs are included unchanged;
+- referenced image paths are de-duplicated across both directions;
+- every referenced JPEG is present in the final image root;
+- every final JPEG passed the image-readability check;
+- files are split into independent standard tar archives;
+- file counts, byte sizes, SHA256 hashes, and repair provenance are retained.
+
+## Verified closure
+
+| Item | Verified value |
+| --- | ---: |
+| Ego2Exo records | 110,118 |
+| Ego2Exo unique referenced images | 220,236 |
+| Exo2Ego records | 123,381 |
+| Exo2Ego unique referenced images | 246,762 |
+| Union referenced JPEGs | 249,642 |
+| Missing before repair | 6,431 |
+| Missing after repair | 0 |
+| Unreadable JPEGs after repair | 0 |
+| Episode groups | 754 |
+| Tar shards | 4 |
+
+The two annotation files retain these identities:
+
+| File | SHA256 |
+| --- | --- |
+| `Ego2Exo_FullTrain.json` | `bb83cac92179b21833d2465ce29d5b0cf81668d8443d569279313c891472175a` |
+| `Exo2Ego_FullTrain.json` | `212e7291990453b087f91dd848dd8a8a8f11a7a0a110fb257be760ca9c8c3058` |
+
+`provenance/final_closure.json` is the authoritative closure report.
+`provenance/repair_receipt.json` records the repair audit. Its
+`already_present_count=6431` means the final repair rerun found all previously
+missing paths already restored; it is not a claim that no repair had been
+needed.
+
+## Repository layout
+
+```text
+.
+├── MANIFEST.json
+├── SHA256SUMS
+├── README.md
+├── data/
+│   ├── data_segswap-00000.tar
+│   ├── data_segswap-00001.tar
+│   ├── data_segswap-00002.tar
+│   └── data_segswap-00003.tar
+├── json/Ego-Exo4D-Seg/frame-level/
+│   ├── Ego2Exo_FullTrain.json
+│   └── Exo2Ego_FullTrain.json
+└── provenance/
+    ├── final_closure.json
+    └── repair_receipt.json
+```
+
+Each `data/*.tar` is independently readable. Extract all four into the same
+destination so their path trees merge.
+
+## Download, verify, and extract
+
+Authenticate with an account that can read this private dataset:
+
+```bash
+hf download Travor278/V2SAM-EgoExo-Train-Mini-Complete \
+  --repo-type dataset \
+  --local-dir V2SAM-EgoExo-Train-Mini-Complete
+
+cd V2SAM-EgoExo-Train-Mini-Complete
+sha256sum -c SHA256SUMS
+
+mkdir -p extracted
+for shard in data/data_segswap-*.tar; do
+  tar -xf "$shard" -C extracted
+done
+```
+
+Point the V2-SAM dataset `sam2_folder` at the extracted image tree and select
+the matching JSON for the desired direction:
+
+- Ego2Exo: `json/Ego-Exo4D-Seg/frame-level/Ego2Exo_FullTrain.json`
+- Exo2Ego: `json/Ego-Exo4D-Seg/frame-level/Exo2Ego_FullTrain.json`
+
+Do not concatenate the JSONs unless the training code explicitly implements a
+mixed-direction dataset contract.
+
+## Integrity files
+
+- `MANIFEST.json`: shard counts, sizes, hashes, JSON identities, and closure
+  report identities.
+- `SHA256SUMS`: command-line integrity verification for every payload and
+  metadata file in this repository.
+- `provenance/final_closure.json`: before/after missing counts and JPEG audit.
+- `provenance/repair_receipt.json`: source archive and repair-run evidence.
+
+The repository is complete only when all SHA256 checks pass and the closure
+report has `ready=true`, `post_repair_missing_count=0`, and
+`post_repair_bad_jpeg_count=0`.

SHA256SUMS

@@ -1,5 +1,5 @@
 a318fa58096de8b32d6ce09175e69603e028314ad14b3ec47ccb4a1d54ecdaf4  MANIFEST.json
-5a5b8a40ec429908baca0222d9c82fa59b09962f25b6560570357bbd700a21cc  README.md
+bad61ffb75a8ae5c71cdf40d68d0cec10117533c72be58650e4bcecbfb9024bf  README.md
 09500cdd38577bdc156e986bf479443829bf36342de6753fed1da5c400c5174d  data/data_segswap-00000.tar
 22d65f3b3d65436c8a63c158061f173c2db5c742105ea67537345b43ad0edc01  data/data_segswap-00001.tar
 f5675ad477e197cd6bcfbc4c0abaccdd358ef32337bc6a1cf5489dcfa76b3196  data/data_segswap-00002.tar