Creating occ gt for mini dataset

[Shiyao-Xu]

Dear OccNet Team,

thank you for your excellent work! I really adore that you release your occ data, but my computer does not have such great memory space for the whole nuscenes dataset, so I would prefer to use mini dataset first.

In my case, how can I get the occ_gt for mini dataset? Could you please release your code regarding generating occ_gt?

Thanks!