Links to pkl files are invalidated.

[congfeng4]

Thanks for sharing this great work with us! The idea is quite inspiring!

### data preparation
1. Create soft link from `data/nuscenes` to your_nuscenes_path

2. Prepare the gts semantic occupancy introduced in [Occ3d](https://github.com/Tsinghua-MARS-Lab/Occ3D)

3. Download our generated train/val pickle files and put them in `data/`

    [nuscenes_infos_train_temporal_v3_scene.pkl](https://cloud.tsinghua.edu.cn/d/9e231ed16e4a4caca3bd/)

    [nuscenes_infos_val_temporal_v3_scene.pkl](https://cloud.tsinghua.edu.cn/d/9e231ed16e4a4caca3bd/)

  The dataset should be organized as follows:

The links to nuscenes_infos_train_temporal_v3_scene.pkl and nuscenes_infos_val_temporal_v3_scene.pkl are invalid.
Would you kindly update the links? Thanks!