Add README

README.md

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+---
+license: apache-2.0
+language:
+- en
+task_categories:
+- text-generation
+tags:
+- physics
+- rigid-body
+- pymunk
+- next-frame-prediction
+- simulation
+- icml-2026
+size_categories:
+- 1M<n<10M
+---
+
+# physics-scenarios-packed
+
+Packed (tar.gz) version of a 2D rigid body physics dataset for training language models on next-frame prediction. **1,000,020 scenes × 200 frames** simulated with Pymunk / Chipmunk2D.
+
+This repo is bandwidth-friendly: each scenario type ships as a single `.tar.gz`. For the unpacked JSONL files see [physics-scenarios-raw](https://huggingface.co/datasets/AlexWortega/physics-scenarios-raw).
+
+## Scale
+
+- **Train**: 900,000 scenes (24 seen scenario types × 37,500 each)
+- **Val**: 100,020 scenes (30 scenario types × 3,334 each — includes 6 OOD types)
+- **Frames per scene**: 200
+- **Format**: JSONL inside tar.gz (1 header line + 200 frame lines per scene file)
+
+## Layout
+
+```
+manifest.json                    # full dataset spec
+train/
+  avalanche.tar.gz               # 24 seen-type archives
+  basketball.tar.gz
+  ...
+val/
+  avalanche.tar.gz               # 30 archives (24 seen + 6 OOD)
+  pong.tar.gz                    # OOD types — never seen at train time
+  bowling.tar.gz
+  ...
+```
+
+## Scenario types
+
+**Seen (24)** — train + val: avalanche, basketball, billiards, breakout, bridge, chain, conveyor, dominos, explosion, funnel, head_on, jenga, marble_run, orbit, pendulum, pinball, plinko, projectile, pyramid, seesaw, ski_jump, tower, wind, wrecking_ball
+
+**Unseen / OOD (6)** — val only:
+- *Simple*: pong, bowling, ramp_roll
+- *Complex*: angry_birds, hourglass, newtons_cradle
+
+The 6 unseen types are held out to measure generalization to scenarios with new dynamics or interactions.
+
+## Schema (per scene file)
+
+Line 1 — header:
+```json
+{"scenario": "billiards", "difficulty": 3, "static_geometry": [...], "constraints": [...], "objects": [...]}
+```
+
+Lines 2–201 — frames:
+```json
+{"frame": 0, "objects": [{"id": 0, "x": 1.234, "y": 5.678, "vx": ..., "vy": ..., "angle": ..., "omega": ...}, ...]}
+```
+
+## Categories
+
+The 30 scenario types span 6 categories:
+- **Collision** — head_on, billiards, breakout, bowling, pong
+- **Stacking** — jenga, tower, pyramid, dominos
+- **Ramp** — ski_jump, projectile, ramp_roll, marble_run
+- **Constraint** — pendulum, chain, bridge, newtons_cradle, hourglass
+- **Minigame** — pinball, plinko, basketball, angry_birds
+- **Complex** — avalanche, explosion, wind, wrecking_ball, conveyor, funnel, orbit, seesaw
+
+## Usage
+
+```python
+from huggingface_hub import snapshot_download
+import tarfile
+
+snapshot_download("AlexWortega/physics-scenarios-packed", repo_type="dataset", local_dir="data")
+
+with tarfile.open("data/train/billiards.tar.gz") as tar:
+    tar.extractall("data/train_extracted")
+```
+
+## Citation
+
+ICML-2026 submission (in progress). Generation pipeline: `src/physics/scenario_generator.py`.