Missing modules after installation

After installing SAM3 following the [instruction](https://github.com/facebookresearch/sam3?tab=readme-ov-file#installation) and try to run one of [jupyter notebook,](https://github.com/facebookresearch/sam3/blob/main/examples/sam3_video_predictor_example.ipynb) a lot of modules are missing.

On windows, here is what I had to install :

```bash
pip install einops
pip install triton-windows
pip install decord
pip install pycocotools
```

Note that for linux you can use the `pip install triton` directly

Best,
Benjamin

Start with the README installation instructions and the linked examples/sam3_video_predictor_example.ipynb, then run the notebook in a fresh installation to reproduce the missing-module errors. Compare its imports with the documented dependencies, and consider the issue complete when the installation instructions cover the required packages for the reported platforms and the notebook starts successfully.

Written by the indexing model from the issue text.