Upload README.md with huggingface_hub

README.md

@@ -0,0 +1,79 @@
+---
+license: cc-by-nc-4.0
+task_categories:
+- robotics
+- image-to-3d
+language:
+- en
+tags:
+- vitra
+- mano
+- hand-object-interaction
+- egocentric
+---
+
+# ssv2-annotations-v1
+
+**Annotations only — no images, no video.**
+
+VITRA-style hand episodes for **Something-Something V2**, with per-hand instructions and paraphrases.
+
+| | |
+|---|---|
+| episodes | **52,706** |
+| training samples (`index_frame_pair` rows) | **1,124,722** |
+| annotation | MANO pose + world/camera joints + per-frame extrinsics |
+| text | one instruction per episode + 2.09 paraphrases on average |
+| **images / video** | **not included** — see *Getting the frames* below |
+
+### What we did
+
+**Episodes are NOT ours** — they are VITRA-1M's official segmentation, used unchanged.
+
+**Instructions are ours.** Two rounds, both with `Qwen3.5-122B-A10B-FP8`:
+round 1 captions 8 frames per episode with the palm's future trajectory drawn on them;
+round 2 checks the sentence belongs to that hand, strips same-hand references
+("Rinse the right hand." -> "Rinse the hand.", because training already prepends
+`Left hand: ... Right hand: ...`), and writes 1-3 paraphrases.
+
+
+### Files
+
+```
+ssv2.tar                 ->  Annotation/ssv2/episodic_annotations/*.npy
+episode_frame_index.npz        index_frame_pair (N,2) uint32 + index_to_episode_id (E,)
+```
+
+`index_frame_pair` **row number is the sample id**: row r = (episode ordinal, frame within
+that episode). `len(index_frame_pair)` is the size of the training set.
+
+```python
+import numpy as np, tarfile
+# tar -xf ssv2.tar
+z = np.load("episode_frame_index.npz", allow_pickle=True)
+ep_slot, frame_id = z["index_frame_pair"][sample_id]
+eid = str(z["index_to_episode_id"][ep_slot])
+d = np.load(f"Annotation/ssv2/episodic_annotations/{eid}.npy", allow_pickle=True).item()
+rgb_frame_id = int(d["video_decode_frame"][frame_id])
+```
+
+Each `.npy` is a dict with `video_name`, `video_decode_frame`, `intrinsics`,
+per-frame `extrinsics` (world->camera), `anno_type` (which hand this episode is for),
+`text`, `text_rephrase`, and a `left`/`right` dict holding `beta`, `hand_pose`,
+`global_orient_worldspace`, `transl_worldspace`, `joints_worldspace`, `kept_frames`.
+`text[hand] = [(sentence, (0, T))]` and `text_rephrase[hand] = [([paraphrases...], (0, T))]`.
+
+### Getting the frames
+
+`video_decode_frame` indexes the **source** video, which we do not redistribute.
+Get it from Something-Something V2 — https://developer.qualcomm.com/software/ai-datasets/something-something, then decode by index (we use `decord`; a self-maintained
+sequential counter drifts silently if the decoder ever skips a frame).
+
+### Known limitations
+
+- Episodes whose round-1 caption came back `N/A` have an empty `text`; they are still in the
+  index. Filter on `text` if you only want captioned episodes.
+- Paraphrase count averages 2.09, not a fixed number. Past 3 the model starts inventing;
+  a sentence with no prepositional phrase honestly supports only one or two.
+- Verified: every episode's stored frame count matches its index rows, and no index entry
+  points at a missing episode.