# Gradio Deployment Notes

- `app.py` defines `build_interface()` and **only** launches the demo when run as `__main__`. Hugging Face imports the module to build the config, so expensive work (dataset download) happens lazily via `lru_cache` helpers.
- Dataset paths follow the LeRobot layout (`data/chunk-000/...`, `videos/chunk-000/rgb/...`). Files are cached inside `dataset_cache/` by `snapshot_download`.
- Default episode data is preloaded when the Blocks tree is constructed, so all widgets render immediately without calling the API.
- User interactions run through `episode_dropdown.change` → `load_episode_payload`, which returns `[instruction, video_path, fig_x, ...]`.
- `demo.queue().launch(show_api=False)` disables the “Use via API” panel (Gradio 5.7.0 had a schema bug with Plot outputs that broke API info).
- If you need to expose the API again, make sure to upgrade to a Gradio release where plot schema serialization works, then set `show_api=True`.